rollback to a snapshot and delete old top volume - missing of "@"

rollback to a snapshot and delete old top volume - missing of "@"

[Kai Herlemann]

[-- Attachment #1: Type: text/plain, Size: 1404 bytes --]

Hi,

I want to rollback a snapshot and have done this by execute "btrfs sub 
set-default / 618".
Now I want to delete the old top volume to save space, but google and 
manuals didn't helped.

I mounted for the following the root volume at /mnt/gparted with 
subvolid=0, subvol=/ has the same effect.
Usually, the top volume is saved in /@, so I would be able to delete it 
by execute "btrfs sub delete /@" (or move at first @ to @_badroot and 
the snapshot to @). But that isn't possible, the output of that command 
is "ERROR: cannot access subvolume /@: No such file or directory".
I've posted the output of "btrfs sub list /mnt/gparted" at 
http://pastebin.com/r7WNbJq8. As you can see, there's no subvolume named @.

I have the same problem with my /home/ partition.

Output of "uname -a" (self-compiled kernel):
Linux debian-linux 4.1.26 #1 SMP Wed Jun 8 18:40:04 CEST 2016 x86_64 
GNU/Linux

Output of "btrfs --version":
btrfs-progs v4.5.2

Output of "btrfs fi show":
Label: none  uuid: f778877c-d50b-48c8-8951-6635c6e23c61
           Total devices 1 FS bytes used 43.70GiB
           devid    1 size 55.62GiB used 47.03GiB path /dev/sda1

Output of "btrfs fi df /":
Data, single: total=44.00GiB, used=42.48GiB
System, single: total=32.00MiB, used=16.00KiB
Metadata, single: total=3.00GiB, used=1.22GiB
GlobalReserve, single: total=416.00MiB, used=0.00B

Output of dmesg attached.

Thank you,
Kai


[-- Attachment #2: dmesg.log --]
[-- Type: text/x-log, Size: 64721 bytes --]

[    0.000000] microcode: CPU0 microcode updated early to revision 0xe, date = 2013-06-26
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Initializing cgroup subsys cpuacct
[    0.000000] Linux version 4.1.26 (root@debian-linux) (gcc version 5.3.1 20160528 (Debian 5.3.1-21) ) #1 SMP Wed Jun 8 18:40:04 CEST 2016
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.1.26 root=UUID=f778877c-d50b-48c8-8951-6635c6e23c61 ro resume=UUID=9be0bf62-859d-42cb-b075-4bd31f41c53d init=/lib/systemd/systemd
[    0.000000] e820: BIOS-provided physical RAM map:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009cfff] usable
[    0.000000] BIOS-e820: [mem 0x000000000009d000-0x000000000009ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000009f680fff] usable
[    0.000000] BIOS-e820: [mem 0x000000009f681000-0x000000009f6befff] reserved
[    0.000000] BIOS-e820: [mem 0x000000009f6bf000-0x000000009f735fff] usable
[    0.000000] BIOS-e820: [mem 0x000000009f736000-0x000000009f7befff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x000000009f7bf000-0x000000009f7defff] usable
[    0.000000] BIOS-e820: [mem 0x000000009f7df000-0x000000009f7fefff] ACPI data
[    0.000000] BIOS-e820: [mem 0x000000009f7ff000-0x000000009f7fffff] usable
[    0.000000] BIOS-e820: [mem 0x000000009f800000-0x000000009fffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000e0000000-0x00000000efffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000feb00000-0x00000000feb03fff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fec00000-0x00000000fec00fff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fed10000-0x00000000fed13fff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fed18000-0x00000000fed19fff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fed1b000-0x00000000fed1ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000ffe80000-0x00000000ffffffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000100000000-0x0000000157ffffff] usable
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] SMBIOS 2.6 present.
[    0.000000] DMI: eMachines        eME730G         /eME730G         , BIOS V1.23 04/25/2011
[    0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
[    0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable
[    0.000000] AGP: No AGP bridge found
[    0.000000] e820: last_pfn = 0x158000 max_arch_pfn = 0x400000000
[    0.000000] MTRR default type: uncachable
[    0.000000] MTRR fixed ranges enabled:
[    0.000000]   00000-9FFFF write-back
[    0.000000]   A0000-BFFFF uncachable
[    0.000000]   C0000-FFFFF write-protect
[    0.000000] MTRR variable ranges enabled:
[    0.000000]   0 base 000000000 mask F80000000 write-back
[    0.000000]   1 base 0FFE00000 mask FFFE00000 write-protect
[    0.000000]   2 base 080000000 mask FE0000000 write-back
[    0.000000]   3 base 09F800000 mask FFF800000 uncachable
[    0.000000]   4 base 100000000 mask FC0000000 write-back
[    0.000000]   5 base 140000000 mask FF0000000 write-back
[    0.000000]   6 base 150000000 mask FF8000000 write-back
[    0.000000]   7 disabled
[    0.000000] PAT configuration [0-7]: WB  WC  UC- UC  WB  WC  UC- UC  
[    0.000000] e820: last_pfn = 0x9f800 max_arch_pfn = 0x400000000
[    0.000000] Base memory trampoline at [ffff880000097000] 97000 size 24576
[    0.000000] init_memory_mapping: [mem 0x00000000-0x000fffff]
[    0.000000]  [mem 0x00000000-0x000fffff] page 4k
[    0.000000] BRK [0x01b12000, 0x01b12fff] PGTABLE
[    0.000000] BRK [0x01b13000, 0x01b13fff] PGTABLE
[    0.000000] BRK [0x01b14000, 0x01b14fff] PGTABLE
[    0.000000] init_memory_mapping: [mem 0x157e00000-0x157ffffff]
[    0.000000]  [mem 0x157e00000-0x157ffffff] page 2M
[    0.000000] BRK [0x01b15000, 0x01b15fff] PGTABLE
[    0.000000] init_memory_mapping: [mem 0x140000000-0x157dfffff]
[    0.000000]  [mem 0x140000000-0x157dfffff] page 2M
[    0.000000] init_memory_mapping: [mem 0x120000000-0x13fffffff]
[    0.000000]  [mem 0x120000000-0x13fffffff] page 2M
[    0.000000] BRK [0x01b16000, 0x01b16fff] PGTABLE
[    0.000000] init_memory_mapping: [mem 0x00100000-0x9f680fff]
[    0.000000]  [mem 0x00100000-0x001fffff] page 4k
[    0.000000]  [mem 0x00200000-0x9f5fffff] page 2M
[    0.000000]  [mem 0x9f600000-0x9f680fff] page 4k
[    0.000000] init_memory_mapping: [mem 0x9f6bf000-0x9f735fff]
[    0.000000]  [mem 0x9f6bf000-0x9f735fff] page 4k
[    0.000000] init_memory_mapping: [mem 0x9f7bf000-0x9f7defff]
[    0.000000]  [mem 0x9f7bf000-0x9f7defff] page 4k
[    0.000000] init_memory_mapping: [mem 0x9f7ff000-0x9f7fffff]
[    0.000000]  [mem 0x9f7ff000-0x9f7fffff] page 4k
[    0.000000] init_memory_mapping: [mem 0x100000000-0x11fffffff]
[    0.000000]  [mem 0x100000000-0x11fffffff] page 2M
[    0.000000] RAMDISK: [mem 0x35e3a000-0x36f14fff]
[    0.000000] ACPI: Early table checksum verification disabled
[    0.000000] ACPI: RSDP 0x00000000000FE020 000024 (v02 ACRSYS)
[    0.000000] ACPI: XSDT 0x000000009F7FE120 00007C (v01 ACRSYS ACRPRDCT 00000001      01000013)
[    0.000000] ACPI: FACP 0x000000009F7FC000 0000F4 (v04 ACRSYS ACRPRDCT 00000001 1025 01000013)
[    0.000000] ACPI: DSDT 0x000000009F7EA000 00E975 (v02 ACRSYS ACRPRDCT 00000001 1025 01000013)
[    0.000000] ACPI: FACS 0x000000009F75A000 000040
[    0.000000] ACPI: FACS 0x000000009F75A000 000040
[    0.000000] ACPI: ASF! 0x000000009F7FD000 0000A5 (v32 ACRSYS ACRPRDCT 00000001 1025 01000013)
[    0.000000] ACPI: HPET 0x000000009F7FB000 000038 (v01 ACRSYS ACRPRDCT 00000001 1025 01000013)
[    0.000000] ACPI: APIC 0x000000009F7FA000 00008C (v02 ACRSYS ACRPRDCT 00000001 1025 01000013)
[    0.000000] ACPI: MCFG 0x000000009F7F9000 00003C (v01 ACRSYS ACRPRDCT 00000001 1025 01000013)
[    0.000000] ACPI: SLIC 0x000000009F7E9000 000176 (v01 ACRSYS ACRPRDCT 00000001 1025 01000013)
[    0.000000] ACPI: BOOT 0x000000009F7E6000 000028 (v01 ACRSYS ACRPRDCT 00000001 1025 01000013)
[    0.000000] ACPI: ASPT 0x000000009F7E2000 000034 (v04 ACRSYS ACRPRDCT 00000001 1025 01000013)
[    0.000000] ACPI: SSDT 0x000000009F7E1000 0009F1 (v01 PmRef  CpuPm    00003000 INTL 20051117)
[    0.000000] ACPI: SSDT 0x000000009F7E0000 000259 (v01 PmRef  Cpu0Tst  00003000 INTL 20051117)
[    0.000000] ACPI: SSDT 0x000000009F7DF000 00049F (v01 PmRef  ApTst    00003000 INTL 20051117)
[    0.000000] ACPI: Local APIC address 0xfee00000
[    0.000000] No NUMA configuration found
[    0.000000] Faking a node at [mem 0x0000000000000000-0x0000000157ffffff]
[    0.000000] NODE_DATA(0) allocated [mem 0x157ff9000-0x157ffcfff]
[    0.000000]  [ffffea0000000000-ffffea00055fffff] PMD -> [ffff880153800000-ffff8801575fffff] on node 0
[    0.000000] Zone ranges:
[    0.000000]   DMA      [mem 0x0000000000001000-0x0000000000ffffff]
[    0.000000]   DMA32    [mem 0x0000000001000000-0x00000000ffffffff]
[    0.000000]   Normal   [mem 0x0000000100000000-0x0000000157ffffff]
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000001000-0x000000000009cfff]
[    0.000000]   node   0: [mem 0x0000000000100000-0x000000009f680fff]
[    0.000000]   node   0: [mem 0x000000009f6bf000-0x000000009f735fff]
[    0.000000]   node   0: [mem 0x000000009f7bf000-0x000000009f7defff]
[    0.000000]   node   0: [mem 0x000000009f7ff000-0x000000009f7fffff]
[    0.000000]   node   0: [mem 0x0000000100000000-0x0000000157ffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000001000-0x0000000157ffffff]
[    0.000000] On node 0 totalpages: 1013429
[    0.000000]   DMA zone: 64 pages used for memmap
[    0.000000]   DMA zone: 21 pages reserved
[    0.000000]   DMA zone: 3996 pages, LIFO batch:0
[    0.000000]   DMA32 zone: 10141 pages used for memmap
[    0.000000]   DMA32 zone: 648985 pages, LIFO batch:31
[    0.000000]   Normal zone: 5632 pages used for memmap
[    0.000000]   Normal zone: 360448 pages, LIFO batch:31
[    0.000000] ACPI: PM-Timer IO Port: 0x408
[    0.000000] ACPI: Local APIC address 0xfee00000
[    0.000000] IOAPIC[0]: apic_id 2, version 32, address 0xfec00000, GSI 0-23
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
[    0.000000] ACPI: IRQ0 used by override.
[    0.000000] ACPI: IRQ9 used by override.
[    0.000000] Using ACPI (MADT) for SMP configuration information
[    0.000000] ACPI: HPET id: 0x8086a201 base: 0xfed00000
[    0.000000] smpboot: Allowing 8 CPUs, 4 hotplug CPUs
[    0.000000] PM: Registered nosave memory: [mem 0x00000000-0x00000fff]
[    0.000000] PM: Registered nosave memory: [mem 0x0009d000-0x0009ffff]
[    0.000000] PM: Registered nosave memory: [mem 0x000a0000-0x000dffff]
[    0.000000] PM: Registered nosave memory: [mem 0x000e0000-0x000fffff]
[    0.000000] PM: Registered nosave memory: [mem 0x9f681000-0x9f6befff]
[    0.000000] PM: Registered nosave memory: [mem 0x9f736000-0x9f7befff]
[    0.000000] PM: Registered nosave memory: [mem 0x9f7df000-0x9f7fefff]
[    0.000000] PM: Registered nosave memory: [mem 0x9f800000-0x9fffffff]
[    0.000000] PM: Registered nosave memory: [mem 0xa0000000-0xdfffffff]
[    0.000000] PM: Registered nosave memory: [mem 0xe0000000-0xefffffff]
[    0.000000] PM: Registered nosave memory: [mem 0xf0000000-0xfeafffff]
[    0.000000] PM: Registered nosave memory: [mem 0xfeb00000-0xfeb03fff]
[    0.000000] PM: Registered nosave memory: [mem 0xfeb04000-0xfebfffff]
[    0.000000] PM: Registered nosave memory: [mem 0xfec00000-0xfec00fff]
[    0.000000] PM: Registered nosave memory: [mem 0xfec01000-0xfed0ffff]
[    0.000000] PM: Registered nosave memory: [mem 0xfed10000-0xfed13fff]
[    0.000000] PM: Registered nosave memory: [mem 0xfed14000-0xfed17fff]
[    0.000000] PM: Registered nosave memory: [mem 0xfed18000-0xfed19fff]
[    0.000000] PM: Registered nosave memory: [mem 0xfed1a000-0xfed1afff]
[    0.000000] PM: Registered nosave memory: [mem 0xfed1b000-0xfed1ffff]
[    0.000000] PM: Registered nosave memory: [mem 0xfed20000-0xfedfffff]
[    0.000000] PM: Registered nosave memory: [mem 0xfee00000-0xfee00fff]
[    0.000000] PM: Registered nosave memory: [mem 0xfee01000-0xffe7ffff]
[    0.000000] PM: Registered nosave memory: [mem 0xffe80000-0xffffffff]
[    0.000000] e820: [mem 0xa0000000-0xdfffffff] available for PCI devices
[    0.000000] Booting paravirtualized kernel on bare hardware
[    0.000000] clocksource refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645519600211568 ns
[    0.000000] setup_percpu: NR_CPUS:512 nr_cpumask_bits:512 nr_cpu_ids:8 nr_node_ids:1
[    0.000000] PERCPU: Embedded 33 pages/cpu @ffff880157c00000 s95512 r8192 d31464 u262144
[    0.000000] pcpu-alloc: s95512 r8192 d31464 u262144 alloc=1*2097152
[    0.000000] pcpu-alloc: [0] 0 1 2 3 4 5 6 7 
[    0.000000] Built 1 zonelists in Node order, mobility grouping on.  Total pages: 997571
[    0.000000] Policy zone: Normal
[    0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.1.26 root=UUID=f778877c-d50b-48c8-8951-6635c6e23c61 ro resume=UUID=9be0bf62-859d-42cb-b075-4bd31f41c53d init=/lib/systemd/systemd
[    0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
[    0.000000] AGP: Checking aperture...
[    0.000000] AGP: No AGP bridge found
[    0.000000] Calgary: detecting Calgary via BIOS EBDA area
[    0.000000] Calgary: Unable to locate Rio Grande table in EBDA - bailing!
[    0.000000] Memory: 3894136K/4053716K available (5649K kernel code, 1016K rwdata, 1856K rodata, 1260K init, 828K bss, 159580K reserved, 0K cma-reserved)
[    0.000000] Hierarchical RCU implementation.
[    0.000000] 	RCU dyntick-idle grace-period acceleration is enabled.
[    0.000000] 	RCU restricting CPUs from NR_CPUS=512 to nr_cpu_ids=8.
[    0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=8
[    0.000000] NR_IRQS:33024 nr_irqs:488 16
[    0.000000] Console: colour VGA+ 80x25
[    0.000000] console [tty0] enabled
[    0.000000] clocksource hpet: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 133484882848 ns
[    0.000000] hpet clockevent registered
[    0.000000] tsc: Fast TSC calibration using PIT
[    0.000000] tsc: Detected 2261.228 MHz processor
[    0.000037] Calibrating delay loop (skipped), value calculated using timer frequency.. 4522.45 BogoMIPS (lpj=9044912)
[    0.000199] pid_max: default: 32768 minimum: 301
[    0.000284] ACPI: Core revision 20150410
[    0.017794] ACPI: All ACPI Tables successfully acquired
[    0.018027] Security Framework initialized
[    0.018116] AppArmor: AppArmor disabled by boot time parameter
[    0.018198] Yama: becoming mindful.
[    0.018599] Dentry cache hash table entries: 524288 (order: 10, 4194304 bytes)
[    0.019700] Inode-cache hash table entries: 262144 (order: 9, 2097152 bytes)
[    0.020213] Mount-cache hash table entries: 8192 (order: 4, 65536 bytes)
[    0.020306] Mountpoint-cache hash table entries: 8192 (order: 4, 65536 bytes)
[    0.020641] Initializing cgroup subsys blkio
[    0.020726] Initializing cgroup subsys memory
[    0.020816] Initializing cgroup subsys devices
[    0.020894] Initializing cgroup subsys freezer
[    0.020975] Initializing cgroup subsys net_cls
[    0.021057] Initializing cgroup subsys perf_event
[    0.021138] Initializing cgroup subsys net_prio
[    0.021242] CPU: Physical Processor ID: 0
[    0.021320] CPU: Processor Core ID: 0
[    0.021399] mce: CPU supports 9 MCE banks
[    0.021487] CPU0: Thermal monitoring enabled (TM1)
[    0.021573] process: using mwait in idle threads
[    0.021652] Last level iTLB entries: 4KB 512, 2MB 7, 4MB 7
[    0.021734] Last level dTLB entries: 4KB 512, 2MB 32, 4MB 32, 1GB 0
[    0.022167] Freeing SMP alternatives memory: 24K (ffffffff81a3b000 - ffffffff81a41000)
[    0.187331] ftrace: allocating 22633 entries in 89 pages
[    0.200306] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
[    0.347335] smpboot: CPU0: Intel(R) Core(TM) i3 CPU       M 350  @ 2.27GHz (fam: 06, model: 25, stepping: 02)
[    0.347640] Performance Events: PEBS fmt1+, 16-deep LBR, Westmere events, Intel PMU driver.
[    0.347985] perf_event_intel: CPUID marked event: 'bus cycles' unavailable
[    0.348071] ... version:                3
[    0.348147] ... bit width:              48
[    0.348224] ... generic registers:      4
[    0.348302] ... value mask:             0000ffffffffffff
[    0.348382] ... max period:             000000007fffffff
[    0.348462] ... fixed-purpose events:   3
[    0.348539] ... event mask:             000000070000000f
[    0.349293] x86: Booting SMP configuration:
[    0.349373] .... node  #0, CPUs:      #1
[    0.362725] NMI watchdog: enabled on all CPUs, permanently consumes one hw-PMU counter.
[    0.363020]  #2
[    0.374422] microcode: CPU2 microcode updated early to revision 0xe, date = 2013-06-26
[    0.376667]  #3
[    0.391764] x86: Booted up 1 node, 4 CPUs
[    0.391850] smpboot: Total of 4 processors activated (18089.82 BogoMIPS)
[    0.394407] devtmpfs: initialized
[    0.397316] PM: Registering ACPI NVS region [mem 0x9f736000-0x9f7befff] (561152 bytes)
[    0.397517] clocksource jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
[    0.397726] pinctrl core: initialized pinctrl subsystem
[    0.397959] NET: Registered protocol family 16
[    0.407371] cpuidle: using governor ladder
[    0.416557] cpuidle: using governor menu
[    0.416703] ACPI FADT declares the system doesn't support PCIe ASPM, so disable it
[    0.416800] ACPI: bus type PCI registered
[    0.416877] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
[    0.417055] PCI: MMCONFIG for domain 0000 [bus 00-ff] at [mem 0xe0000000-0xefffffff] (base 0xe0000000)
[    0.417159] PCI: MMCONFIG at [mem 0xe0000000-0xefffffff] reserved in E820
[    0.417824] PCI: Using configuration type 1 for base access
[    0.418111] mtrr: your CPUs had inconsistent variable MTRR settings
[    0.418193] mtrr: probably your BIOS does not setup all CPUs.
[    0.418274] mtrr: corrected configuration.
[    0.427867] ACPI: Added _OSI(Module Device)
[    0.427948] ACPI: Added _OSI(Processor Device)
[    0.428027] ACPI: Added _OSI(3.0 _SCP Extensions)
[    0.428108] ACPI: Added _OSI(Processor Aggregator Device)
[    0.432283] ACPI: Executed 1 blocks of module-level executable AML code
[    0.437038] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query ignored
[    0.437628] ACPI: Dynamic OEM Table Load:
[    0.437827] ACPI: SSDT 0xFFFF8801529D5400 0003F0 (v01 PmRef  Cpu0Ist  00003000 INTL 20051117)
[    0.438733] ACPI: Dynamic OEM Table Load:
[    0.438930] ACPI: SSDT 0xFFFF88015349B000 000891 (v01 PmRef  Cpu0Cst  00003001 INTL 20051117)
[    0.440193] ACPI: Dynamic OEM Table Load:
[    0.440390] ACPI: SSDT 0xFFFF880152B30C00 000303 (v01 PmRef  ApIst    00003000 INTL 20051117)
[    0.441306] ACPI: Dynamic OEM Table Load:
[    0.441501] ACPI: SSDT 0xFFFF8801529CD400 000119 (v01 PmRef  ApCst    00003000 INTL 20051117)
[    0.442896] ACPI : EC: EC started
[    0.447878] ACPI: Interpreter enabled
[    0.447967] ACPI Exception: AE_NOT_FOUND, While evaluating Sleep State [\_S1_] (20150410/hwxface-580)
[    0.448187] ACPI Exception: AE_NOT_FOUND, While evaluating Sleep State [\_S2_] (20150410/hwxface-580)
[    0.448421] ACPI: (supports S0 S3 S4 S5)
[    0.448499] ACPI: Using IOAPIC for interrupt routing
[    0.448618] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug
[    0.860630] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-fe])
[    0.860720] acpi PNP0A08:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI]
[    0.860858] \_SB_.PCI0:_OSC invalid UUID
[    0.860859] _OSC request data:1 1f 0 
[    0.860863] acpi PNP0A08:00: _OSC failed (AE_ERROR); disabling ASPM
[    0.861574] PCI host bridge to bus 0000:00
[    0.861657] pci_bus 0000:00: root bus resource [bus 00-fe]
[    0.861735] pci_bus 0000:00: root bus resource [io  0x0000-0x0cf7 window]
[    0.861820] pci_bus 0000:00: root bus resource [io  0x0d00-0xffff window]
[    0.861905] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff window]
[    0.861997] pci_bus 0000:00: root bus resource [mem 0xa0000000-0xfebfffff window]
[    0.862101] pci 0000:00:00.0: [8086:0044] type 00 class 0x060000
[    0.862124] DMAR: BIOS has allocated no shadow GTT; disabling IOMMU for graphics
[    0.862353] pci 0000:00:01.0: [8086:0045] type 01 class 0x060400
[    0.862388] pci 0000:00:01.0: PME# supported from D0 D3hot D3cold
[    0.862558] pci 0000:00:16.0: [8086:3b64] type 00 class 0x078000
[    0.862588] pci 0000:00:16.0: reg 0x10: [mem 0xb4106100-0xb410610f 64bit]
[    0.862678] pci 0000:00:16.0: PME# supported from D0 D3hot D3cold
[    0.862833] pci 0000:00:1a.0: [8086:3b3c] type 00 class 0x0c0320
[    0.863218] pci 0000:00:1a.0: reg 0x10: [mem 0xb4105c00-0xb4105fff]
[    0.865439] pci 0000:00:1a.0: PME# supported from D0 D3hot D3cold
[    0.865595] pci 0000:00:1b.0: [8086:3b56] type 00 class 0x040300
[    0.865620] pci 0000:00:1b.0: reg 0x10: [mem 0xb4100000-0xb4103fff 64bit]
[    0.865722] pci 0000:00:1b.0: PME# supported from D0 D3hot D3cold
[    0.865826] pci 0000:00:1b.0: System wakeup disabled by ACPI
[    0.865960] pci 0000:00:1c.0: [8086:3b42] type 01 class 0x060400
[    0.866054] pci 0000:00:1c.0: PME# supported from D0 D3hot D3cold
[    0.866156] pci 0000:00:1c.0: System wakeup disabled by ACPI
[    0.866285] pci 0000:00:1c.1: [8086:3b44] type 01 class 0x060400
[    0.866379] pci 0000:00:1c.1: PME# supported from D0 D3hot D3cold
[    0.866536] pci 0000:00:1d.0: [8086:3b34] type 00 class 0x0c0320
[    0.866912] pci 0000:00:1d.0: reg 0x10: [mem 0xb4105800-0xb4105bff]
[    0.869131] pci 0000:00:1d.0: PME# supported from D0 D3hot D3cold
[    0.869248] pci 0000:00:1d.0: System wakeup disabled by ACPI
[    0.869380] pci 0000:00:1e.0: [8086:2448] type 01 class 0x060401
[    0.869540] pci 0000:00:1e.0: System wakeup disabled by ACPI
[    0.869668] pci 0000:00:1f.0: [8086:3b09] type 00 class 0x060100
[    0.869906] pci 0000:00:1f.2: [8086:3b29] type 00 class 0x010601
[    0.869930] pci 0000:00:1f.2: reg 0x10: [io  0x4048-0x404f]
[    0.869941] pci 0000:00:1f.2: reg 0x14: [io  0x4054-0x4057]
[    0.869951] pci 0000:00:1f.2: reg 0x18: [io  0x4040-0x4047]
[    0.869962] pci 0000:00:1f.2: reg 0x1c: [io  0x4050-0x4053]
[    0.869973] pci 0000:00:1f.2: reg 0x20: [io  0x4020-0x403f]
[    0.869985] pci 0000:00:1f.2: reg 0x24: [mem 0xb4105000-0xb41057ff]
[    0.870040] pci 0000:00:1f.2: PME# supported from D3hot
[    0.870177] pci 0000:00:1f.3: [8086:3b30] type 00 class 0x0c0500
[    0.870200] pci 0000:00:1f.3: reg 0x10: [mem 0xb4106000-0xb41060ff 64bit]
[    0.870230] pci 0000:00:1f.3: reg 0x20: [io  0x4000-0x401f]
[    0.870448] pci 0000:01:00.0: [1002:68e0] type 00 class 0x030000
[    0.870469] pci 0000:01:00.0: reg 0x10: [mem 0xa0000000-0xafffffff 64bit pref]
[    0.870483] pci 0000:01:00.0: reg 0x18: [mem 0xb4000000-0xb401ffff 64bit]
[    0.870492] pci 0000:01:00.0: reg 0x20: [io  0x3000-0x30ff]
[    0.870509] pci 0000:01:00.0: reg 0x30: [mem 0xfffe0000-0xffffffff pref]
[    0.870545] pci 0000:01:00.0: supports D1 D2
[    0.870646] pci 0000:01:00.1: [1002:aa68] type 00 class 0x040300
[    0.870666] pci 0000:01:00.1: reg 0x10: [mem 0xb4020000-0xb4023fff 64bit]
[    0.870734] pci 0000:01:00.1: supports D1 D2
[    0.870808] pci 0000:00:01.0: PCI bridge to [bus 01]
[    0.870892] pci 0000:00:01.0:   bridge window [io  0x3000-0x3fff]
[    0.870895] pci 0000:00:01.0:   bridge window [mem 0xb4000000-0xb40fffff]
[    0.870898] pci 0000:00:01.0:   bridge window [mem 0xa0000000-0xafffffff 64bit pref]
[    0.871016] pci 0000:02:00.0: [14e4:1692] type 00 class 0x020000
[    0.871065] pci 0000:02:00.0: reg 0x10: [mem 0xb3000000-0xb300ffff 64bit]
[    0.871298] pci 0000:02:00.0: PME# supported from D3hot D3cold
[    0.875603] pci 0000:00:1c.0: PCI bridge to [bus 02]
[    0.875696] pci 0000:00:1c.0:   bridge window [io  0x2000-0x2fff]
[    0.875701] pci 0000:00:1c.0:   bridge window [mem 0xb3000000-0xb3ffffff]
[    0.875708] pci 0000:00:1c.0:   bridge window [mem 0xb0000000-0xb0ffffff 64bit pref]
[    0.875828] pci 0000:03:00.0: [14e4:4357] type 00 class 0x028000
[    0.875876] pci 0000:03:00.0: reg 0x10: [mem 0xb2000000-0xb2003fff 64bit]
[    0.876117] pci 0000:03:00.0: supports D1 D2
[    0.876119] pci 0000:03:00.0: PME# supported from D0 D3hot D3cold
[    0.883605] pci 0000:00:1c.1: PCI bridge to [bus 03]
[    0.883696] pci 0000:00:1c.1:   bridge window [io  0x1000-0x1fff]
[    0.883700] pci 0000:00:1c.1:   bridge window [mem 0xb2000000-0xb2ffffff]
[    0.883708] pci 0000:00:1c.1:   bridge window [mem 0xb1000000-0xb1ffffff 64bit pref]
[    0.883794] pci 0000:00:1e.0: PCI bridge to [bus 04] (subtractive decode)
[    0.883887] pci 0000:00:1e.0:   bridge window [io  0x0000-0x0cf7 window] (subtractive decode)
[    0.883889] pci 0000:00:1e.0:   bridge window [io  0x0d00-0xffff window] (subtractive decode)
[    0.883891] pci 0000:00:1e.0:   bridge window [mem 0x000a0000-0x000bffff window] (subtractive decode)
[    0.883893] pci 0000:00:1e.0:   bridge window [mem 0xa0000000-0xfebfffff window] (subtractive decode)
[    1.088332] ACPI: PCI Interrupt Link [LNKA] (IRQs 1 3 4 5 6 7 *10 12 14 15)
[    1.089157] ACPI: PCI Interrupt Link [LNKB] (IRQs 1 3 4 5 6 7 *11 12 14 15)
[    1.089978] ACPI: PCI Interrupt Link [LNKC] (IRQs 1 3 4 5 6 7 10 12 14 15) *0, disabled.
[    1.090931] ACPI: PCI Interrupt Link [LNKD] (IRQs 1 3 4 5 6 7 11 12 14 15) *10
[    1.091827] ACPI: PCI Interrupt Link [LNKE] (IRQs 1 3 4 5 6 7 10 12 14 15) *0, disabled.
[    1.092778] ACPI: PCI Interrupt Link [LNKF] (IRQs 1 3 4 5 6 7 *11 12 14 15)
[    1.093599] ACPI: PCI Interrupt Link [LNKG] (IRQs 1 3 4 5 6 7 *10 12 14 15)
[    1.094424] ACPI: PCI Interrupt Link [LNKH] (IRQs 1 3 4 5 6 7 *11 12 14 15)
[    1.095212] ACPI: PCI Root Bridge [CPBG] (domain 0000 [bus ff])
[    1.095298] acpi PNP0A03:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI]
[    1.095401] acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND); disabling ASPM
[    1.095543] PCI host bridge to bus 0000:ff
[    1.095627] pci_bus 0000:ff: root bus resource [bus ff]
[    1.095708] pci 0000:ff:00.0: [8086:2c62] type 00 class 0x060000
[    1.095764] pci 0000:ff:00.1: [8086:2d01] type 00 class 0x060000
[    1.095824] pci 0000:ff:02.0: [8086:2d10] type 00 class 0x060000
[    1.095877] pci 0000:ff:02.1: [8086:2d11] type 00 class 0x060000
[    1.095931] pci 0000:ff:02.2: [8086:2d12] type 00 class 0x060000
[    1.095982] pci 0000:ff:02.3: [8086:2d13] type 00 class 0x060000
[    1.096097] ACPI: Enabled 5 GPEs in block 00 to 3F
[    1.096344] ACPI : EC: GPE = 0x17, I/O: command/status = 0x66, data = 0x62
[    1.096558] vgaarb: setting as boot device: PCI:0000:01:00.0
[    1.096641] vgaarb: device added: PCI:0000:01:00.0,decodes=io+mem,owns=io+mem,locks=none
[    1.096741] vgaarb: loaded
[    1.096814] vgaarb: bridge control possible 0000:01:00.0
[    1.097015] PCI: Using ACPI for IRQ routing
[    1.106986] PCI: pci_cache_line_size set to 64 bytes
[    1.107132] e820: reserve RAM buffer [mem 0x0009d000-0x0009ffff]
[    1.107133] e820: reserve RAM buffer [mem 0x9f681000-0x9fffffff]
[    1.107135] e820: reserve RAM buffer [mem 0x9f736000-0x9fffffff]
[    1.107137] e820: reserve RAM buffer [mem 0x9f7df000-0x9fffffff]
[    1.107138] e820: reserve RAM buffer [mem 0x9f800000-0x9fffffff]
[    1.107320] hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0, 0, 0, 0, 0, 0
[    1.107923] hpet0: 8 comparators, 64-bit 14.318180 MHz counter
[    1.110034] Switched to clocksource hpet
[    1.116875] pnp: PnP ACPI init
[    1.318277] pnp 00:00: disabling [io  0x164e-0x164f] because it overlaps 0000:00:1c.1 BAR 13 [io  0x1000-0x1fff]
[    1.318446] system 00:00: [io  0x0680-0x069f] has been reserved
[    1.318529] system 00:00: [io  0xff2c-0xff2f] has been reserved
[    1.318612] system 00:00: [io  0x0800-0x080f] has been reserved
[    1.318696] system 00:00: [io  0xffff] has been reserved
[    1.318776] system 00:00: [io  0xffff] has been reserved
[    1.318859] system 00:00: [io  0x0400-0x047f] could not be reserved
[    1.318942] system 00:00: [io  0x0500-0x057f] has been reserved
[    1.319029] system 00:00: Plug and Play ACPI device, IDs PNP0c02 (active)
[    1.319071] pnp 00:01: Plug and Play ACPI device, IDs PNP0b00 (active)
[    1.319123] pnp 00:02: Plug and Play ACPI device, IDs PNP0303 (active)
[    1.319194] pnp 00:03: Plug and Play ACPI device, IDs SYN1b16 SYN1b00 SYN0002 PNP0f13 (active)
[    1.319514] pnp 00:04: disabling [mem 0xfffff000-0xffffffff] because it overlaps 0000:01:00.0 BAR 6 [mem 0xfffe0000-0xffffffff pref]
[    1.319652] system 00:04: [mem 0xfed1c000-0xfed1ffff] has been reserved
[    1.319737] system 00:04: [mem 0xfed10000-0xfed13fff] has been reserved
[    1.319822] system 00:04: [mem 0xfed18000-0xfed18fff] has been reserved
[    1.319906] system 00:04: [mem 0xfed19000-0xfed19fff] has been reserved
[    1.319990] system 00:04: [mem 0xe0000000-0xefffffff] has been reserved
[    1.320074] system 00:04: [mem 0xfed20000-0xfed3ffff] has been reserved
[    1.320157] system 00:04: [mem 0xfed45000-0xfed8ffff] has been reserved
[    1.320243] system 00:04: [mem 0xff000000-0xffffffff] could not be reserved
[    1.320328] system 00:04: [mem 0xfee00000-0xfeefffff] could not be reserved
[    1.320413] system 00:04: Plug and Play ACPI device, IDs PNP0c02 (active)
[    1.320536] pnp: PnP ACPI: found 5 devices
[    1.328052] clocksource acpi_pm: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns: 2085701024 ns
[    1.328160] pci 0000:01:00.0: can't claim BAR 6 [mem 0xfffe0000-0xffffffff pref]: no compatible bridge window
[    1.328303] pci 0000:01:00.0: BAR 6: assigned [mem 0xb4040000-0xb405ffff pref]
[    1.328401] pci 0000:00:01.0: PCI bridge to [bus 01]
[    1.328484] pci 0000:00:01.0:   bridge window [io  0x3000-0x3fff]
[    1.328570] pci 0000:00:01.0:   bridge window [mem 0xb4000000-0xb40fffff]
[    1.328654] pci 0000:00:01.0:   bridge window [mem 0xa0000000-0xafffffff 64bit pref]
[    1.328756] pci 0000:00:1c.0: PCI bridge to [bus 02]
[    1.328839] pci 0000:00:1c.0:   bridge window [io  0x2000-0x2fff]
[    1.328923] pci 0000:00:1c.0:   bridge window [mem 0xb3000000-0xb3ffffff]
[    1.329010] pci 0000:00:1c.0:   bridge window [mem 0xb0000000-0xb0ffffff 64bit pref]
[    1.329115] pci 0000:00:1c.1: PCI bridge to [bus 03]
[    1.329197] pci 0000:00:1c.1:   bridge window [io  0x1000-0x1fff]
[    1.329283] pci 0000:00:1c.1:   bridge window [mem 0xb2000000-0xb2ffffff]
[    1.329369] pci 0000:00:1c.1:   bridge window [mem 0xb1000000-0xb1ffffff 64bit pref]
[    1.329474] pci 0000:00:1e.0: PCI bridge to [bus 04]
[    1.329565] pci_bus 0000:00: resource 4 [io  0x0000-0x0cf7 window]
[    1.329567] pci_bus 0000:00: resource 5 [io  0x0d00-0xffff window]
[    1.329569] pci_bus 0000:00: resource 6 [mem 0x000a0000-0x000bffff window]
[    1.329571] pci_bus 0000:00: resource 7 [mem 0xa0000000-0xfebfffff window]
[    1.329573] pci_bus 0000:01: resource 0 [io  0x3000-0x3fff]
[    1.329574] pci_bus 0000:01: resource 1 [mem 0xb4000000-0xb40fffff]
[    1.329576] pci_bus 0000:01: resource 2 [mem 0xa0000000-0xafffffff 64bit pref]
[    1.329578] pci_bus 0000:02: resource 0 [io  0x2000-0x2fff]
[    1.329580] pci_bus 0000:02: resource 1 [mem 0xb3000000-0xb3ffffff]
[    1.329582] pci_bus 0000:02: resource 2 [mem 0xb0000000-0xb0ffffff 64bit pref]
[    1.329584] pci_bus 0000:03: resource 0 [io  0x1000-0x1fff]
[    1.329586] pci_bus 0000:03: resource 1 [mem 0xb2000000-0xb2ffffff]
[    1.329588] pci_bus 0000:03: resource 2 [mem 0xb1000000-0xb1ffffff 64bit pref]
[    1.329590] pci_bus 0000:04: resource 4 [io  0x0000-0x0cf7 window]
[    1.329592] pci_bus 0000:04: resource 5 [io  0x0d00-0xffff window]
[    1.329594] pci_bus 0000:04: resource 6 [mem 0x000a0000-0x000bffff window]
[    1.329596] pci_bus 0000:04: resource 7 [mem 0xa0000000-0xfebfffff window]
[    1.329682] NET: Registered protocol family 2
[    1.330003] TCP established hash table entries: 32768 (order: 6, 262144 bytes)
[    1.330236] TCP bind hash table entries: 32768 (order: 7, 524288 bytes)
[    1.330485] TCP: Hash tables configured (established 32768 bind 32768)
[    1.330605] UDP hash table entries: 2048 (order: 4, 65536 bytes)
[    1.330723] UDP-Lite hash table entries: 2048 (order: 4, 65536 bytes)
[    1.330900] NET: Registered protocol family 1
[    1.362313] pci 0000:01:00.0: Video device with shadowed ROM
[    1.362393] PCI: CLS 64 bytes, default 64
[    1.362453] Unpacking initramfs...
[    1.709679] Freeing initrd memory: 17260K (ffff880035e3a000 - ffff880036f15000)
[    1.709817] PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
[    1.709900] software IO TLB [mem 0x9b681000-0x9f681000] (64MB) mapped at [ffff88009b681000-ffff88009f680fff]
[    1.710037] Simple Boot Flag at 0x44 set to 0x1
[    1.710266] microcode: CPU0 sig=0x20652, pf=0x10, revision=0xe
[    1.710361] microcode: CPU1 sig=0x20652, pf=0x10, revision=0xe
[    1.710460] microcode: CPU2 sig=0x20652, pf=0x10, revision=0xe
[    1.710550] microcode: CPU3 sig=0x20652, pf=0x10, revision=0xe
[    1.710713] microcode: Microcode Update Driver: v2.00 <tigran@aivazian.fsnet.co.uk>, Peter Oruba
[    1.711234] futex hash table entries: 2048 (order: 5, 131072 bytes)
[    1.711374] audit: initializing netlink subsys (disabled)
[    1.711479] audit: type=2000 audit(1467865125.440:1): initialized
[    1.711946] HugeTLB registered 2 MB page size, pre-allocated 0 pages
[    1.712055] zpool: loaded
[    1.712295] VFS: Disk quotas dquot_6.6.0
[    1.712402] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[    1.713011] alg: No test for stdrng (krng)
[    1.713121] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252)
[    1.713269] io scheduler noop registered
[    1.713353] io scheduler deadline registered
[    1.713447] io scheduler cfq registered (default)
[    1.714107] pci_hotplug: PCI Hot Plug PCI Core version: 0.5
[    1.714209] pciehp: PCI Express Hot Plug Controller Driver version: 0.4
[    1.716025] intel_idle: MWAIT substates: 0x1120
[    1.716027] intel_idle: v0.4 model 0x25
[    1.716028] intel_idle: lapic_timer_reliable_states 0xffffffff
[    1.716254] GHES: HEST is not enabled!
[    1.716411] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[    1.717025] Linux agpgart interface v0.103
[    1.717209] AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>
[    1.717291] AMD IOMMUv2 functionality not available on this system
[    1.717787] i8042: PNP: PS/2 Controller [PNP0303:KBC0,PNP0f13:MSS0] at 0x60,0x64 irq 1,12
[    1.735143] serio: i8042 KBD port at 0x60,0x64 irq 1
[    1.735228] serio: i8042 AUX port at 0x60,0x64 irq 12
[    1.735470] mousedev: PS/2 mouse device common for all mice
[    1.737390] rtc_cmos 00:01: RTC can wake from S4
[    1.737617] rtc_cmos 00:01: rtc core: registered rtc_cmos as rtc0
[    1.737733] rtc_cmos 00:01: alarms up to one year, y3k, 242 bytes nvram, hpet irqs
[    1.737847] ledtrig-cpu: registered to indicate activity on CPUs
[    1.738373] NET: Registered protocol family 10
[    1.738743] mip6: Mobile IPv6
[    1.738824] NET: Registered protocol family 17
[    1.738909] mpls_gso: MPLS GSO support
[    1.739382] registered taskstats version 1
[    1.740065] rtc_cmos 00:01: setting system clock to 2016-07-07 04:18:45 UTC (1467865125)
[    1.740251] PM: Checking hibernation image partition UUID=9be0bf62-859d-42cb-b075-4bd31f41c53d
[    1.757345] input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input0
[    1.768560] PM: Hibernation image not present or could not be loaded.
[    1.769337] Freeing unused kernel memory: 1260K (ffffffff81900000 - ffffffff81a3b000)
[    1.769458] Write protecting the kernel read-only data: 8192k
[    1.770131] Freeing unused kernel memory: 484K (ffff880001587000 - ffff880001600000)
[    1.770522] Freeing unused kernel memory: 192K (ffff8800017d0000 - ffff880001800000)
[    1.796411] random: systemd-udevd urandom read with 8 bits of entropy available
[    1.831331] pps_core: LinuxPPS API ver. 1 registered
[    1.831421] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[    1.831961] ACPI: bus type USB registered
[    1.832022] PTP clock support registered
[    1.832170] usbcore: registered new interface driver usbfs
[    1.832276] usbcore: registered new interface driver hub
[    1.832409] usbcore: registered new device driver usb
[    1.833285] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    1.833626] ehci-pci: EHCI PCI platform driver
[    1.833661] tg3.c:v3.137 (May 11, 2014)
[    1.834018] ehci-pci 0000:00:1a.0: EHCI Host Controller
[    1.834114] ehci-pci 0000:00:1a.0: new USB bus registered, assigned bus number 1
[    1.834221] ehci-pci 0000:00:1a.0: debug port 2
[    1.838230] ehci-pci 0000:00:1a.0: cache line size of 64 is not supported
[    1.838253] ehci-pci 0000:00:1a.0: irq 16, io mem 0xb4105c00
[    1.839819] SCSI subsystem initialized
[    1.843333] libata version 3.00 loaded.
[    1.848345] libphy: tg3 mdio bus: probed
[    1.850359] ehci-pci 0000:00:1a.0: USB 2.0 started, EHCI 1.00
[    1.850535] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[    1.850629] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.850738] usb usb1: Product: EHCI Host Controller
[    1.850837] usb usb1: Manufacturer: Linux 4.1.26 ehci_hcd
[    1.850931] usb usb1: SerialNumber: 0000:00:1a.0
[    1.851238] hub 1-0:1.0: USB hub found
[    1.851338] hub 1-0:1.0: 2 ports detected
[    1.851923] ehci-pci 0000:00:1d.0: EHCI Host Controller
[    1.852033] ehci-pci 0000:00:1d.0: new USB bus registered, assigned bus number 2
[    1.852163] ehci-pci 0000:00:1d.0: debug port 2
[    1.856214] ehci-pci 0000:00:1d.0: cache line size of 64 is not supported
[    1.856301] ehci-pci 0000:00:1d.0: irq 23, io mem 0xb4105800
[    1.866369] ehci-pci 0000:00:1d.0: USB 2.0 started, EHCI 1.00
[    1.866552] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
[    1.866662] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.866790] usb usb2: Product: EHCI Host Controller
[    1.866902] usb usb2: Manufacturer: Linux 4.1.26 ehci_hcd
[    1.867002] usb usb2: SerialNumber: 0000:00:1d.0
[    1.867389] hub 2-0:1.0: USB hub found
[    1.869105] hub 2-0:1.0: 2 ports detected
[    1.869450] ahci 0000:00:1f.2: version 3.0
[    1.869691] ahci 0000:00:1f.2: SSS flag set, parallel bus scan disabled
[    1.869830] ahci 0000:00:1f.2: AHCI 0001.0300 32 slots 4 ports 3 Gbps 0x3 impl SATA mode
[    1.869956] ahci 0000:00:1f.2: flags: 64bit ncq sntf stag pm led clo pio slum part ems apst 
[    1.875322] scsi host0: ahci
[    1.875704] scsi host1: ahci
[    1.876017] scsi host2: ahci
[    1.876278] scsi host3: ahci
[    1.876444] ata1: SATA max UDMA/133 abar m2048@0xb4105000 port 0xb4105100 irq 25
[    1.876550] ata2: SATA max UDMA/133 abar m2048@0xb4105000 port 0xb4105180 irq 25
[    1.876658] ata3: DUMMY
[    1.876733] ata4: DUMMY
[    1.921592] tg3 0000:02:00.0 eth0: Tigon3 [partno(BCM57780) rev 57780001] (PCI Express) MAC address 88:ae:1d:62:3b:a5
[    1.921719] tg3 0000:02:00.0 eth0: attached PHY driver [Broadcom BCM57780] (mii_bus:phy_addr=200:01)
[    1.921832] tg3 0000:02:00.0 eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1]
[    1.921949] tg3 0000:02:00.0 eth0: dma_rwctrl[76180000] dma_mask[64-bit]
[    1.924870] tg3 0000:02:00.0 enp2s0: renamed from eth0
[    2.166549] usb 1-1: new high-speed USB device number 2 using ehci-pci
[    2.178552] usb 2-1: new high-speed USB device number 2 using ehci-pci
[    2.194577] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[    2.195976] ata1.00: ATA-8: WDC WD3200BPVT-22ZEST0, 01.01A01, max UDMA/133
[    2.196063] ata1.00: 625142448 sectors, multi 0: LBA48 NCQ (depth 31/32), AA
[    2.197743] ata1.00: configured for UDMA/133
[    2.198221] scsi 0:0:0:0: Direct-Access     ATA      WDC WD3200BPVT-2 1A01 PQ: 0 ANSI: 5
[    2.299214] usb 1-1: New USB device found, idVendor=8087, idProduct=0020
[    2.299298] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    2.299847] hub 1-1:1.0: USB hub found
[    2.300148] hub 1-1:1.0: 6 ports detected
[    2.310996] usb 2-1: New USB device found, idVendor=8087, idProduct=0020
[    2.311090] usb 2-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    2.311558] hub 2-1:1.0: USB hub found
[    2.311712] hub 2-1:1.0: 8 ports detected
[    2.518716] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[    2.521951] ata2.00: ATAPI: MATSHITADVD-RAM UJ890AS, 1.00, max UDMA/100
[    2.524308] ata2.00: configured for UDMA/100
[    2.528339] scsi 1:0:0:0: CD-ROM            MATSHITA DVD-RAM UJ890AS  1.00 PQ: 0 ANSI: 5
[    2.539054] sd 0:0:0:0: [sda] 625142448 512-byte logical blocks: (320 GB/298 GiB)
[    2.539166] sd 0:0:0:0: [sda] 4096-byte physical blocks
[    2.539337] sd 0:0:0:0: [sda] Write Protect is off
[    2.539427] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
[    2.539463] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[    2.549515] sr 1:0:0:0: [sr0] scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray
[    2.549628] cdrom: Uniform CD-ROM driver Revision: 3.20
[    2.549908] sr 1:0:0:0: Attached scsi CD-ROM sr0
[    2.570694] usb 1-1.1: new high-speed USB device number 3 using ehci-pci
[    2.618078]  sda: sda1 sda2 sda3 < sda5 sda6 >
[    2.619634] sd 0:0:0:0: [sda] Attached SCSI disk
[    2.699028] usb 1-1.1: New USB device found, idVendor=064e, idProduct=a219
[    2.699126] usb 1-1.1: New USB device strings: Mfr=2, Product=1, SerialNumber=3
[    2.699230] usb 1-1.1: Product: 1.3M WebCam
[    2.699373] usb 1-1.1: Manufacturer: Suyin
[    2.699458] usb 1-1.1: SerialNumber: HF1315-S32B-OV01-VA-R02.01.05
[    2.706724] tsc: Refined TSC clocksource calibration: 2261.391 MHz
[    2.706826] clocksource tsc: mask: 0xffffffffffffffff max_cycles: 0x2098bcacd1a, max_idle_ns: 440795311585 ns
[    2.847627] psmouse serio1: synaptics: queried max coordinates: x [..5772], y [..5086]
[    2.963031] psmouse serio1: synaptics: Touchpad model: 1, fw: 7.2, id: 0x1c0b1, caps: 0xd04733/0xa40000/0xa0000, board id: 0, fw id: 570026
[    3.034483] input: SynPS/2 Synaptics TouchPad as /devices/platform/i8042/serio1/input/input2
[    3.450993] raid6: sse2x1   gen()  2290 MB/s
[    3.519006] raid6: sse2x1   xor()  1775 MB/s
[    3.587053] raid6: sse2x2   gen()  2699 MB/s
[    3.655065] raid6: sse2x2   xor()  2115 MB/s
[    3.723153] raid6: sse2x4   gen()  2807 MB/s
[    3.791182] raid6: sse2x4   xor()  2252 MB/s
[    3.791279] raid6: using algorithm sse2x4 gen() 2807 MB/s
[    3.791372] raid6: .... xor() 2252 MB/s, rmw enabled
[    3.791460] raid6: using ssse3x2 recovery algorithm
[    3.791795] Switched to clocksource tsc
[    3.791946] xor: measuring software checksum speed
[    3.831122]    prefetch64-sse:  9441.000 MB/sec
[    3.871138]    generic_sse:  8312.000 MB/sec
[    3.871217] xor: using function: prefetch64-sse (9441.000 MB/sec)
[    3.875837] Btrfs loaded
[    3.943550] BTRFS: device fsid 70cab2b7-62e6-40f2-8310-9d75f523bba1 devid 1 transid 328643 /dev/sda5
[    3.943997] BTRFS: device fsid f778877c-d50b-48c8-8951-6635c6e23c61 devid 1 transid 166287 /dev/sda1
[    3.947153] PM: Starting manual resume from disk
[    3.947244] PM: Hibernation image partition 8:6 present
[    3.947246] PM: Looking for hibernation image.
[    3.947541] PM: Image not found (code -22)
[    3.947547] PM: Hibernation image not present or could not be loaded.
[    3.976567] BTRFS info (device sda1): disk space caching is enabled
[    3.976664] BTRFS: has skinny extents
[    4.071941] BTRFS: bdev /dev/sda1 errs: wr 4, rd 10, flush 0, corrupt 0, gen 0
[    4.715537] random: nonblocking pool is initialized
[    5.650894] systemd[1]: RTC configured in localtime, applying delta of 120 minutes to system time.
[    6.091819] systemd[1]: systemd 230 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ -LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN)
[    6.092284] systemd[1]: Detected architecture x86-64.
[    6.173095] systemd[1]: Set hostname to <debian-linux>.
[    9.557461] systemd[1]: Listening on RPCbind Server Activation Socket.
[    9.558132] systemd[1]: Listening on Journal Audit Socket.
[    9.558657] systemd[1]: Listening on Journal Socket (/dev/log).
[    9.559157] systemd[1]: Reached target Encrypted Volumes.
[    9.559661] systemd[1]: Listening on Syslog Socket.
[    9.560185] systemd[1]: Started Dispatch Password Requests to Console Directory Watch.
[    9.560724] systemd[1]: Listening on udev Control Socket.
[    9.561244] systemd[1]: Listening on Journal Socket.
[    9.561775] systemd[1]: Listening on udev Kernel Socket.
[    9.562297] systemd[1]: Started Forward Password Requests to Wall Directory Watch.
[    9.562826] systemd[1]: Listening on fsck to fsckd communication Socket.
[    9.563427] systemd[1]: Created slice User and Session Slice.
[    9.563994] systemd[1]: Created slice System Slice.
[    9.583452] systemd[1]: Starting Load Kernel Modules...
[    9.584309] systemd[1]: Mounting Huge Pages File System...
[    9.584709] systemd[1]: Reached target Slices.
[    9.585705] systemd[1]: Mounting Debug File System...
[    9.586218] systemd[1]: Created slice system-systemd\x2dfsck.slice.
[    9.587257] systemd[1]: Starting Create list of required static device nodes for the current kernel...
[    9.587770] systemd[1]: Created slice system-getty.slice.
[    9.588720] systemd[1]: Starting Remount Root and Kernel File Systems...
[    9.589126] systemd[1]: Reached target User and Group Name Lookups.
[    9.806560] lp: driver loaded but no devices found
[    9.863647] systemd[1]: Starting Set the console keyboard layout...
[    9.864238] systemd[1]: Set up automount Arbitrary Executable File Formats File System Automount Point.
[    9.865352] systemd[1]: Mounting POSIX Message Queue File System...
[    9.866439] systemd[1]: Starting Journal Service...
[    9.866909] systemd[1]: Listening on /dev/initctl Compatibility Named Pipe.
[    9.868957] systemd[1]: Started Create list of required static device nodes for the current kernel.
[    9.870381] systemd[1]: Starting Create Static Device Nodes in /dev...
[    9.874005] ppdev: user-space parallel port driver
[    9.929759] systemd[1]: Started Load Kernel Modules.
[    9.930955] systemd[1]: Starting Apply Kernel Variables...
[   10.253013] systemd[1]: Started Apply Kernel Variables.
[   10.309027] BTRFS info (device sda1): disk space caching is enabled
[   10.309601] systemd[1]: Mounted Debug File System.
[   10.311096] systemd[1]: Mounted POSIX Message Queue File System.
[   10.311874] systemd[1]: Mounted Huge Pages File System.
[   10.327591] systemd[1]: Started Remount Root and Kernel File Systems.
[   10.329407] systemd[1]: Starting Load/Save Random Seed...
[   10.496541] systemd[1]: Starting udev Coldplug all Devices...
[   10.497841] systemd[1]: Started Load/Save Random Seed.
[   10.690448] systemd[1]: Started udev Coldplug all Devices.
[   10.708219] systemd[1]: Started Set the console keyboard layout.
[   10.851150] systemd[1]: Started Journal Service.
[   10.975459] systemd-journald[216]: Received request to flush runtime journal from PID 1
[   19.342766] shpchp: Standard Hot Plug PCI Controller Driver version: 0.4
[   19.369332] input: Power Button as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:10/PNP0C0C:00/input/input3
[   19.369450] ACPI: Power Button [PWRB]
[   19.369588] input: Lid Switch as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:10/PNP0C0D:00/input/input4
[   19.369764] ACPI: Lid Switch [LID0]
[   19.369891] input: Sleep Button as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:10/PNP0C0E:00/input/input5
[   19.369993] ACPI: Sleep Button [SLPB]
[   19.370136] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input6
[   19.370232] ACPI: Power Button [PWRF]
[   19.448892] ACPI Warning: SystemIO range 0x0000000000000428-0x000000000000042F conflicts with OpRegion 0x0000000000000400-0x000000000000047F (\PMIO) (20150410/utaddress-254)
[   19.449181] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
[   19.449307] ACPI Warning: SystemIO range 0x0000000000000540-0x000000000000054F conflicts with OpRegion 0x0000000000000500-0x0000000000000563 (\GPIO) (20150410/utaddress-254)
[   19.449607] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
[   19.449732] ACPI Warning: SystemIO range 0x0000000000000530-0x000000000000053F conflicts with OpRegion 0x0000000000000500-0x0000000000000563 (\GPIO) (20150410/utaddress-254)
[   19.450008] ACPI Warning: SystemIO range 0x0000000000000530-0x000000000000053F conflicts with OpRegion 0x0000000000000500-0x000000000000053F (\_SB_.PCI0.GPIO) (20150410/utaddress-254)
[   19.450287] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
[   19.450405] ACPI Warning: SystemIO range 0x0000000000000500-0x000000000000052F conflicts with OpRegion 0x0000000000000500-0x0000000000000563 (\GPIO) (20150410/utaddress-254)
[   19.450682] ACPI Warning: SystemIO range 0x0000000000000500-0x000000000000052F conflicts with OpRegion 0x0000000000000500-0x000000000000053F (\_SB_.PCI0.GPIO) (20150410/utaddress-254)
[   19.450957] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
[   19.451078] lpc_ich: Resource conflict(s) found affecting gpio_ich
[   19.609523] ACPI Warning: SystemIO range 0x0000000000004000-0x000000000000401F conflicts with OpRegion 0x0000000000004000-0x000000000000400F (\_SB_.PCI0.SBUS.SMBI) (20150410/utaddress-254)
[   19.609812] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
[   19.671199] ACPI: Video Device [VGA] (multi-head: yes  rom: yes  post: no)
[   19.705038] wmi: Mapper loaded
[   19.981707] acpi device:0d: registered as cooling_device4
[   19.981898] input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:09/LNXVIDEO:01/input/input7
[   20.137762] ACPI: AC Adapter [AC] (on-line)
[   20.339655] sd 0:0:0:0: Attached scsi generic sg0 type 0
[   20.339824] sr 1:0:0:0: Attached scsi generic sg1 type 5
[   20.358542] bcma: bus0: Found chip with id 43225, rev 0x01 and package 0x0A
[   20.358670] bcma: bus0: Core 0 found: ChipCommon (manuf 0x4BF, id 0x800, rev 0x22, class 0x0)
[   20.358798] bcma: bus0: Core 1 found: IEEE 802.11 (manuf 0x4BF, id 0x812, rev 0x17, class 0x0)
[   20.358964] bcma: bus0: Core 2 found: PCIe (manuf 0x4BF, id 0x820, rev 0x0F, class 0x0)
[   20.371984] bcma: bus0: Bus registered
[   20.521912] kvm: VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL does not work properly. Using workaround
[   20.580018] [drm] Initialized drm 1.1.0 20060810
[   20.776182] input: PC Speaker as /devices/platform/pcspkr/input/input8
[   21.376801] snd_hda_intel 0000:01:00.1: Handle VGA-switcheroo audio client
[   21.541803] Error: Driver 'pcspkr' is already registered, aborting...
[   21.694474] ACPI: Battery Slot [BAT0] (battery present)
[   22.209167] iTCO_vendor_support: vendor-support=0
[   22.512652] acer_wmi: Acer Laptop ACPI-WMI Extras
[   22.512790] acer_wmi: Function bitmap for Communication Button: 0x1
[   22.512898] acer_wmi: Brightness must be controlled by acpi video driver
[   22.513850] input: Acer WMI hotkeys as /devices/virtual/input/input9
[   22.514366] input: Acer BMA150 accelerometer as /devices/virtual/input/input10
[   22.962217] iTCO_wdt: Intel TCO WatchDog Timer Driver v1.11
[   22.962357] iTCO_wdt: Found a HM55 TCO device (Version=2, TCOBASE=0x0460)
[   22.962589] iTCO_wdt: initialized. heartbeat=30 sec (nowayout=0)
[   23.020995] [drm] radeon kernel modesetting enabled.
[   23.021474] [drm] initializing kernel modesetting (CEDAR 0x1002:0x68E0 0x1025:0x036D).
[   23.021592] [drm] register mmio base: 0xB4000000
[   23.021674] [drm] register mmio size: 131072
[   23.021845] ATOM BIOS: Acer
[   23.021987] radeon 0000:01:00.0: VRAM: 512M 0x0000000000000000 - 0x000000001FFFFFFF (512M used)
[   23.022086] radeon 0000:01:00.0: GTT: 1024M 0x0000000020000000 - 0x000000005FFFFFFF
[   23.022184] [drm] Detected VRAM RAM=512M, BAR=256M
[   23.022263] [drm] RAM width 64bits DDR
[   23.022407] [TTM] Zone  kernel: Available graphics memory: 1956678 kiB
[   23.022493] [TTM] Initializing pool allocator
[   23.022580] [TTM] Initializing DMA pool allocator
[   23.022683] [drm] radeon: 512M of VRAM memory ready
[   23.022764] [drm] radeon: 1024M of GTT memory ready.
[   23.022877] [drm] Loading CEDAR Microcode
[   23.044815] input: HDA ATI HDMI HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1/input11
[   23.383332] snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC272X: line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:speaker
[   23.383444] snd_hda_codec_realtek hdaudioC0D0:    speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[   23.383545] snd_hda_codec_realtek hdaudioC0D0:    hp_outs=1 (0x21/0x0/0x0/0x0/0x0)
[   23.383643] snd_hda_codec_realtek hdaudioC0D0:    mono: mono_out=0x0
[   23.383727] snd_hda_codec_realtek hdaudioC0D0:    inputs:
[   23.383810] snd_hda_codec_realtek hdaudioC0D0:      Internal Mic=0x19
[   23.383894] snd_hda_codec_realtek hdaudioC0D0:      Mic=0x18
[   23.393871] input: HDA Digital PCBeep as /devices/pci0000:00/0000:00:1b.0/sound/card0/input12
[   23.394242] input: HDA Intel MID Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input13
[   23.394458] input: HDA Intel MID Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card0/input14
[   24.012208] media: Linux media interface: v0.10
[   24.290210] Linux video capture interface: v2.00
[   24.495188] cfg80211: Calling CRDA to update world regulatory domain
[   24.786077] [drm] Internal thermal controller with fan control
[   24.808823] [drm] radeon: dpm initialized
[   25.742455] [drm] GART: num cpu pages 262144, num gpu pages 262144
[   25.755507] [drm] PCIE GART of 1024M enabled (table at 0x000000000025E000).
[   25.755738] radeon 0000:01:00.0: WB enabled
[   25.755821] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000020000c00 and cpu addr 0xffff880096f06c00
[   25.755936] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000020000c0c and cpu addr 0xffff880096f06c0c
[   25.756775] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x000000000005c418 and cpu addr 0xffffc90000c1c418
[   25.756882] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[   25.756967] [drm] Driver supports precise vblank timestamp query.
[   25.757050] radeon 0000:01:00.0: radeon: MSI limited to 32-bit
[   25.757174] radeon 0000:01:00.0: radeon: using MSI.
[   25.757282] [drm] radeon: irq initialized.
[   25.774346] [drm] ring test on 0 succeeded in 1 usecs
[   25.774453] [drm] ring test on 3 succeeded in 2 usecs
[   25.944596] Support for cores revisions 0x17 and 0x18 disabled by module param allhwsupport=0. Try b43.allhwsupport=1
[   25.944766] b43: probe of bcma0:1 failed with error -524
[   25.944876] Broadcom 43xx driver loaded [ Features: PMNLS ]
[   25.950824] [drm] ring test on 5 succeeded in 1 usecs
[   25.950913] [drm] UVD initialized successfully.
[   25.951329] [drm] ib test on ring 0 succeeded in 0 usecs
[   25.951442] [drm] ib test on ring 3 succeeded in 0 usecs
[   26.600333] [drm] ib test on ring 5 succeeded
[   26.656418] [drm] radeon atom DIG backlight initialized
[   26.656517] [drm] Radeon Display Connectors
[   26.656597] [drm] Connector 0:
[   26.656672] [drm]   LVDS-1
[   26.656749] [drm]   DDC: 0x6560 0x6560 0x6564 0x6564 0x6568 0x6568 0x656c 0x656c
[   26.656845] [drm]   Encoders:
[   26.656921] [drm]     LCD1: INTERNAL_UNIPHY
[   26.656999] [drm] Connector 1:
[   26.657075] [drm]   HDMI-A-1
[   26.657149] [drm]   HPD1
[   26.657225] [drm]   DDC: 0x6430 0x6430 0x6434 0x6434 0x6438 0x6438 0x643c 0x643c
[   26.657322] [drm]   Encoders:
[   26.657395] [drm]     DFP1: INTERNAL_UNIPHY1
[   26.657475] [drm] Connector 2:
[   26.657550] [drm]   VGA-1
[   26.657626] [drm]   DDC: 0x6460 0x6460 0x6464 0x6464 0x6468 0x6468 0x646c 0x646c
[   26.657723] [drm]   Encoders:
[   26.657799] [drm]     CRT1: INTERNAL_KLDSCP_DAC1
[   26.970095] uvcvideo: Found UVC 1.00 device 1.3M WebCam (064e:a219)
[   26.980466] input: 1.3M WebCam as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1:1.0/input/input15
[   26.980876] usbcore: registered new interface driver uvcvideo
[   26.980967] USB Video Class driver (1.1.1)
[   27.318359] brcmsmac bcma0:1: mfg 4bf core 812 rev 23 class 0 irq 17
[   27.644721] cfg80211: Calling CRDA to update world regulatory domain
[   27.873525] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[   27.873809] cfg80211: Calling CRDA to update world regulatory domain
[   27.874883] brcmsmac bcma0:1 wlp3s0b1: renamed from wlan0
[   28.707816] Adding 7340028k swap on /dev/sda6.  Priority:-1 extents:1 across:7340028k FS
[   29.079512] [drm] fb mappable at 0xA045F000
[   29.079612] [drm] vram apper at 0xA0000000
[   29.079704] [drm] size 4325376
[   29.079794] [drm] fb depth is 24
[   29.079882] [drm]    pitch is 5632
[   29.080196] fbcon: radeondrmfb (fb0) is primary device
[   29.142488] BTRFS info (device sda5): disk space caching is enabled
[   29.142489] BTRFS: has skinny extents
[   29.201188] BTRFS: bdev /dev/sda5 errs: wr 46, rd 1, flush 0, corrupt 0, gen 0
[   29.308510] fuse init (API version 7.23)
[   29.321470] cfg80211: World regulatory domain updated:
[   29.321472] cfg80211:  DFS Master region: unset
[   29.321472] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
[   29.321474] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)
[   29.321475] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)
[   29.321476] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (N/A, 2000 mBm), (N/A)
[   29.321478] cfg80211:   (5170000 KHz - 5250000 KHz @ 80000 KHz, 160000 KHz AUTO), (N/A, 2000 mBm), (N/A)
[   29.321480] cfg80211:   (5250000 KHz - 5330000 KHz @ 80000 KHz, 160000 KHz AUTO), (N/A, 2000 mBm), (0 s)
[   29.321481] cfg80211:   (5490000 KHz - 5730000 KHz @ 160000 KHz), (N/A, 2000 mBm), (0 s)
[   29.321482] cfg80211:   (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A, 2000 mBm), (N/A)
[   29.321483] cfg80211:   (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 0 mBm), (N/A)
[   29.321493] cfg80211: Calling CRDA for country: US
[   29.334273] cfg80211: Regulatory domain changed to country: US
[   29.334275] cfg80211:  DFS Master region: FCC
[   29.334276] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
[   29.334279] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A, 3000 mBm), (N/A)
[   29.334281] cfg80211:   (5170000 KHz - 5250000 KHz @ 80000 KHz, 160000 KHz AUTO), (N/A, 1700 mBm), (N/A)
[   29.334284] cfg80211:   (5250000 KHz - 5330000 KHz @ 80000 KHz, 160000 KHz AUTO), (N/A, 2300 mBm), (0 s)
[   29.334286] cfg80211:   (5490000 KHz - 5730000 KHz @ 160000 KHz), (N/A, 2300 mBm), (0 s)
[   29.334288] cfg80211:   (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A, 3000 mBm), (N/A)
[   29.334290] cfg80211:   (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 4000 mBm), (N/A)
[   36.258908] Console: switching to colour frame buffer device 170x48
[   36.270877] radeon 0000:01:00.0: fb0: radeondrmfb frame buffer device
[   36.270878] radeon 0000:01:00.0: registered panic notifier
[   37.308854] [drm] Initialized radeon 2.42.0 20080528 for 0000:01:00.0 on minor 0
[   39.070390] RPC: Registered named UNIX socket transport module.
[   39.072241] RPC: Registered udp transport module.
[   39.073931] RPC: Registered tcp transport module.
[   39.075569] RPC: Registered tcp NFSv4.1 backchannel transport module.
[   39.112678] FS-Cache: Loaded
[   39.203480] FS-Cache: Netfs 'nfs' registered for caching
[   39.278019] Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
[   39.766359] cgroup: new mount options do not match the existing superblock, will be ignored
[   57.816130] IPv6: ADDRCONF(NETDEV_UP): wlp3s0b1: link is not ready
[   58.099616] brcmsmac bcma0:1: brcms_ops_bss_info_changed: qos enabled: false (implement)
[   58.100871] brcmsmac bcma0:1: brcms_ops_config: change power-save mode: false (implement)
[   58.103869] IPv6: ADDRCONF(NETDEV_UP): wlp3s0b1: link is not ready
[   58.118843] IPv6: ADDRCONF(NETDEV_UP): enp2s0: link is not ready
[   58.146455] IPv6: ADDRCONF(NETDEV_UP): enp2s0: link is not ready
[   58.962305] tg3 0000:02:00.0 enp2s0: Link is down
[   59.089547] IPv6: ADDRCONF(NETDEV_UP): wlp3s0b1: link is not ready
[   59.752208] wlp3s0b1: authenticate with c0:ff:d4:a3:a3:22
[   59.755796] wlp3s0b1: send auth to c0:ff:d4:a3:a3:22 (try 1/3)
[   59.759143] wlp3s0b1: authenticated
[   59.761542] wlp3s0b1: associate with c0:ff:d4:a3:a3:22 (try 1/3)
[   59.768323] wlp3s0b1: RX AssocResp from c0:ff:d4:a3:a3:22 (capab=0x1411 status=0 aid=6)
[   59.770609] brcmsmac bcma0:1: brcmsmac: brcms_ops_bss_info_changed: associated
[   59.772267] brcmsmac bcma0:1: brcms_ops_bss_info_changed: qos enabled: true (implement)
[   59.773983] wlp3s0b1: associated
[   59.775616] IPv6: ADDRCONF(NETDEV_CHANGE): wlp3s0b1: link becomes ready
[   59.787943] brcmsmac bcma0:1: wl0: brcms_c_d11hdrs_mac80211:  txop exceeded phylen 245/256 dur 2466/1504
[   59.821247] brcmsmac bcma0:1: wl0: brcms_c_d11hdrs_mac80211:  txop exceeded phylen 250/256 dur 2506/1504
[   59.845503] brcmsmac bcma0:1: wl0: brcms_c_d11hdrs_mac80211:  txop exceeded phylen 138/256 dur 1610/1504
[   59.858182] brcmsmac bcma0:1: wl0: brcms_c_d11hdrs_mac80211:  txop exceeded phylen 186/256 dur 1994/1504
[   59.888753] brcmsmac bcma0:1: wl0: brcms_c_d11hdrs_mac80211:  txop exceeded phylen 159/256 dur 1778/1504
[   59.897425] brcmsmac bcma0:1: wl0: brcms_c_d11hdrs_mac80211:  txop exceeded phylen 137/256 dur 1602/1504
[   63.535172] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[  291.721211] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[  528.151786] perf interrupt took too long (2505 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
[  587.872949] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[  839.738986] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 1081.466235] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 1311.178258] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 1591.020005] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 1657.621834] brcmsmac bcma0:1: wl0: brcms_c_d11hdrs_mac80211:  txop exceeded phylen 153/256 dur 1730/1504
[ 1839.802208] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 2068.237303] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 2328.427485] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 2629.253966] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 2928.055398] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 3166.504854] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 3430.925756] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 3513.872922] BTRFS: could not find root 8
[ 3694.765269] BTRFS info (device sda1): qgroup scan completed (inconsistency flag cleared)
[ 3700.413553] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 3774.489937] perf interrupt took too long (5055 > 5000), lowering kernel.perf_event_max_sample_rate to 25000
[ 3994.332504] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 4290.246091] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 4552.796687] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 4790.897667] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 4891.862858] JFS: nTxBlock = 8192, nTxLock = 65536
[ 4892.015016] SGI XFS with ACLs, security attributes, realtime, no debug enabled
[ 4937.735671] BTRFS: device fsid ab574715-dcdd-4b8c-8804-ad6a38fcc5d4 devid 1 transid 3 /dev/sda7
[ 4958.972744] BTRFS info (device sda7): disk space caching is enabled
[ 4958.972753] BTRFS: has skinny extents
[ 4958.972756] BTRFS: flagging fs with big metadata feature
[ 4959.019007] BTRFS: creating UUID tree
[ 5005.436580] BTRFS info (device sda7): disk space caching is enabled
[ 5005.436586] BTRFS: has skinny extents
[ 5081.752006] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 5268.620754] brcmsmac bcma0:1: wl0: brcms_c_d11hdrs_mac80211:  txop exceeded phylen 153/256 dur 1730/1504
[ 5330.656083] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 5594.096518] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 5825.060858] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 6103.313175] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 6359.758001] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 6644.231858] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 6924.130529] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 7201.106740] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 7456.726211] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 7714.666396] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 7968.817977] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 8229.736093] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)
[ 8519.335816] brcmsmac bcma0:1: brcms_ops_bss_info_changed: arp filtering: 1 addresses (implement)

Re: rollback to a snapshot and delete old top volume - missing of "@"

[Henk Slager]

On Thu, Jul 7, 2016 at 2:17 PM, Kai Herlemann <nesadaw@freenet.de> wrote:
> Hi,
>
> I want to rollback a snapshot and have done this by execute "btrfs sub
> set-default / 618".
maybe just a typo here, command syntax is:
# sudo btrfs sub set-default
btrfs subvolume set-default: too few arguments
usage: btrfs subvolume set-default <subvolid> <path>

   Set the default subvolume of a filesystem

> Now I want to delete the old top volume to save space, but google and
> manuals didn't helped.
>
> I mounted for the following the root volume at /mnt/gparted with subvolid=0,
> subvol=/ has the same effect.
> Usually, the top volume is saved in /@, so I would be able to delete it by
> execute "btrfs sub delete /@" (or move at first @ to @_badroot and the
> snapshot to @). But that isn't possible, the output of that command is
> "ERROR: cannot access subvolume /@: No such file or directory".
> I've posted the output of "btrfs sub list /mnt/gparted" at
> http://pastebin.com/r7WNbJq8. As you can see, there's no subvolume named @.

I think one or the other commandtyping didn't have its expected
effect, just to make sure I get the right state, can you do:

mkdir -p /fsroot
mount -o subvolid=0 UUID=<uuid of filesystem> /fsroot
btrfs sub list /fsroot
btrfs subvolume get-default /

What the latest debian likes as naming convention I dont know, but in
openSuSE @ is a directory in the toplevel volume (ID=5 or ID=0 as
alias) and that directory contains subvolumes. You can do whatever you
like best, but at least make sure you have mount entries in fstab
subvolumes like var/cache/apt and usr/src, otherwise this magnificent
rootfstree snapshotting gets you into trouble.

I think your current default subvolume is still 5, so you would need:

fstab:
UUID=<uuid of filesystem>    /    btrfs    defaults   0 0
#UUID=<uuid of filesystem>    /home    btrfs    defaults,subvol=@/home   0 0
UUID=<uuid of filesystem>    /usr/src    btrfs
defaults,subvol=@/usr/src   0 0
UUID=<uuid of filesystem>    /var/cache/apt    btrfs
defaults,subvol=@/var/cache/apt   0 0
UUID=<uuid of filesystem>    /.snapshots    btrfs
defaults,subvol=@/.snapshots   0 0
UUID=<uuid of filesystem>    /fsroot    btrfs    noauto,subvolid=0   0 0


mkdir -p /fsroot
mount -o subvolid=0 UUID=<uuid of filesystem> /fsroot

mkdir -p /usr/src
mkdir -p /var/cache/apt
mkdir -p /.snapshots

mkdir -p /fsroot/@/usr
mkdir -p /fsroot/@/var/cache

btrfs sub create /fsroot/@/usr/src
btrfs sub create /fsroot/@/var/cache/apt
btrfs sub create /fsroot/@/.snapshots

#snapshots might need different, the proposed one works at least for snapper

btrfs sub snap / /fsroot/@/latestrootfs
btrfs sub set-default <ID of /fsroot/@/latestrootfs> /
btrfs fi sync /

#for home fs is it similar as for root fs

reboot

You can then when you want rollback, set a snapshot to rw  (or rename
latestrootfs, snapshot snapshot to that name ) and make it default
subvol and reboot (or maybe also do some temp chroot tricks, I have
not tried that)

> I have the same problem with my /home/ partition.
>
> Output of "uname -a" (self-compiled kernel):
> Linux debian-linux 4.1.26 #1 SMP Wed Jun 8 18:40:04 CEST 2016 x86_64
> GNU/Linux
>
> Output of "btrfs --version":
> btrfs-progs v4.5.2
>
> Output of "btrfs fi show":
> Label: none  uuid: f778877c-d50b-48c8-8951-6635c6e23c61
>           Total devices 1 FS bytes used 43.70GiB
>           devid    1 size 55.62GiB used 47.03GiB path /dev/sda1
>
> Output of "btrfs fi df /":
> Data, single: total=44.00GiB, used=42.48GiB
> System, single: total=32.00MiB, used=16.00KiB
> Metadata, single: total=3.00GiB, used=1.22GiB
> GlobalReserve, single: total=416.00MiB, used=0.00B
>
> Output of dmesg attached.
>
> Thank you,
> Kai
>

Re: rollback to a snapshot and delete old top volume - missing of "@"

[Chris Murphy]

On Thu, Jul 7, 2016 at 10:01 AM, Henk Slager <eye1tm@gmail.com> wrote:

> What the latest debian likes as naming convention I dont know, but in
> openSuSE @ is a directory in the toplevel volume (ID=5 or ID=0 as
> alias) and that directory contains subvolumes.

No, opensuse doesn't use @ at all. They use a subvolume called
.snapshots to contain snapper snapshots.

On a system using snapper, its snapshots should probably be deleted
via snapper so it's aware of the state change.

And very clearly from the OP's output from 'btrfs sub list' there are
no subvolumes with @ in the path, so there is no subvolume @, nor are
there any subvolumes contained in a directory @.

Assuming the posted output from btrfs sub list is the complete output,
.snapshots is a directory and there are three subvolumes in it. I
suspect the OP is unfamiliar with snapper conventions and is trying to
delete a snapshot outside of snapper, and is used to some other
(Debian or Ubuntu) convention where snapshots somehow relate to @,
which is a mimicking of how ZFS does things.

Anyway the reason why the command fails is stated in the error
message. The system appears to be installed in the top level of the
file system (subvolid=5), and that can't be deleted. First it's the
immutable first subvolume of a Btrfs file system, and second it's
populated with other subvolumes which would inhibit its removal even
if it weren't the top level subvolume.

What can be done is delete the directories in the top level, retaining
the subvolumes that are there.




-- 
Chris Murphy

Re: rollback to a snapshot and delete old top volume - missing of "@"

[Henk Slager]

On Thu, Jul 7, 2016 at 7:40 PM, Chris Murphy <lists@colorremedies.com> wrote:
> On Thu, Jul 7, 2016 at 10:01 AM, Henk Slager <eye1tm@gmail.com> wrote:
>
>> What the latest debian likes as naming convention I dont know, but in
>> openSuSE @ is a directory in the toplevel volume (ID=5 or ID=0 as
>> alias) and that directory contains subvolumes.

Sorry, I mixed-up latest opensuse and my own adaptions to older installations.

> No, opensuse doesn't use @ at all. They use a subvolume called
> .snapshots to contain snapper snapshots.

On current fresh install "openSUSE Tumbleweed (20160703) (x86_64)" you get this:

# btrfs sub list /
ID 257 gen 24369 top level 5 path @
ID 258 gen 24369 top level 257 path @/.snapshots
ID 259 gen 24369 top level 258 path @/.snapshots/1/snapshot
ID 265 gen 25404 top level 257 path @/tmp
ID 267 gen 24369 top level 257 path @/var/cache
ID 268 gen 20608 top level 257 path @/var/crash
ID 269 gen 20608 top level 257 path @/var/lib/libvirt/images
ID 270 gen 3903 top level 257 path @/var/lib/mailman
ID 271 gen 2996 top level 257 path @/var/lib/mariadb
ID 272 gen 3904 top level 257 path @/var/lib/mysql
ID 273 gen 3903 top level 257 path @/var/lib/named
ID 274 gen 22228 top level 257 path @/var/lib/pgsql
ID 275 gen 25404 top level 257 path @/var/log
ID 276 gen 20611 top level 257 path @/var/opt
ID 277 gen 25404 top level 257 path @/var/spool
ID 278 gen 24369 top level 257 path @/var/tmp
ID 300 gen 10382 top level 258 path @/.snapshots/15/snapshot
[..]

@ is the only thing in the toplevel

I have changed it a bit for this particular PC, so that more is in one subvol.
Just after default install, subvol with ID 259 is made default and rw

I had also updated my older linux installs a bit like this, but with @
a dir, not a subvol, so that at least I can easily swap
'latestroofs' subvol with something else. My interpretation of the
OP's report was that he basically wants something like that too.

> On a system using snapper, its snapshots should probably be deleted
> via snapper so it's aware of the state change.

You can do that, but also with btrfs sub del in re-organisation
actions like described here. If you delete the .xml files in the
subvol .snapshots, it starts counting from 1 again. Changing the
latest .xml file can make it start counting from some higher number if
that is important for many-months history for example.

> And very clearly from the OP's output from 'btrfs sub list' there are
> no subvolumes with @ in the path, so there is no subvolume @, nor are
> there any subvolumes contained in a directory @.
>
> Assuming the posted output from btrfs sub list is the complete output,
> .snapshots is a directory and there are three subvolumes in it. I
> suspect the OP is unfamiliar with snapper conventions and is trying to
> delete a snapshot outside of snapper, and is used to some other
> (Debian or Ubuntu) convention where snapshots somehow relate to @,
> which is a mimicking of how ZFS does things.
>
> Anyway the reason why the command fails is stated in the error
> message. The system appears to be installed in the top level of the
> file system (subvolid=5), and that can't be deleted. First it's the
> immutable first subvolume of a Btrfs file system, and second it's
> populated with other subvolumes which would inhibit its removal even
> if it weren't the top level subvolume.
>
> What can be done is delete the directories in the top level, retaining
> the subvolumes that are there.

Indeed, yes, as a last cleanup step.

Re: rollback to a snapshot and delete old top volume - missing of "@"

[Andrei Borzenkov]

07.07.2016 15:17, Kai Herlemann пишет:
> Hi,
> 
> I want to rollback a snapshot and have done this by execute "btrfs sub
> set-default / 618".
> Now I want to delete the old top volume to save space, but google and
> manuals didn't helped.
> 
> I mounted for the following the root volume at /mnt/gparted with
> subvolid=0, subvol=/ has the same effect.
> Usually, the top volume is saved in /@, so I would be able to delete it
> by execute "btrfs sub delete /@" (or move at first @ to @_badroot and
> the snapshot to @). But that isn't possible, the output of that command
> is "ERROR: cannot access subvolume /@: No such file or directory".
> I've posted the output of "btrfs sub list /mnt/gparted" at
> http://pastebin.com/r7WNbJq8. As you can see, there's no subvolume named @.
> 
> I have the same problem with my /home/ partition.
> 
> Output of "uname -a" (self-compiled kernel):
> Linux debian-linux 4.1.26 #1 SMP Wed Jun 8 18:40:04 CEST 2016 x86_64
> GNU/Linux
> 

You need to ask on your distribution list; this is really not a question
of btrfs but rather how distribution manages snapshots.

But if you originally installed in top level subvolume, then you have no
way to delete it. You may try to manually clean content of top level
subvolume if you need to free space.

That was initial implementation done by (open)SUSE and they changed it
later to install in subvolume from the very start. But information you
provided is not enough to know how system was installed originally.

Re: rollback to a snapshot and delete old top volume - missing of "@"

[Kai Herlemann]

Am 07.07.2016 um 19:40 schrieb Chris Murphy:
> And very clearly from the OP's output from 'btrfs sub list' there are
> no subvolumes with @ in the path, so there is no subvolume @, nor are
> there any subvolumes contained in a directory @.
>
> [...]
>
> Anyway the reason why the command fails is stated in the error
> message. The system appears to be installed in the top level of the
> file system (subvolid=5), and that can't be deleted. First it's the
> immutable first subvolume of a Btrfs file system, and second it's
> populated with other subvolumes which would inhibit its removal even
> if it weren't the top level subvolume.
>
> What can be done is delete the directories in the top level, retaining
> the subvolumes that are there.
Thank you, that was it: there was really no subvolume named @ existing. 
Thank you to Henk and Andrei, too.
I didn't believed that, although there was no @ from ot the output of 
"btrfs sub list", because all websites that dealt with this topic and 
which I used for research statet that a subvolume named @ would 
automatically be created (or I misunderstood the sites), and secondly, 
because the ID of the top level volume is in my case 5, and I 
(mis)understand, in cases where's the subvolume "@" automatically 
created, the ID of that subvolume would be also 5.
I created now myself a subvolume "@" on the top level volume, moved then 
all the data from the snapshot, which I used the last days, to the new 
subvolume, and deleted then all data from the top level volume, except 
the sub level volume @ of course, and made previously a backup snapshot 
from the top level volume. Other users who reading later here and want 
to move their data from top level volume should able to do the same.

If here any developers read along: I'd like to suggest that there's 
automatically made a subvolume "@" by default, which is set as default 
subvolume, or a tip to the distribution, that it would made sense to do 
that with the installation. It would protect other users against 
confusion and work like I had it.

Thank you,
Kai

Re: rollback to a snapshot and delete old top volume - missing of "@"

[Chris Murphy]

On Fri, Jul 8, 2016 at 2:08 PM, Kai Herlemann <nesadaw@freenet.de> wrote:

> If here any developers read along: I'd like to suggest that there's
> automatically made a subvolume "@" by default, which is set as default
> subvolume, or a tip to the distribution, that it would made sense to do that
> with the installation. It would protect other users against confusion and
> work like I had it.

I think that upstream won't do that or recommend it. There is already
a subvolume created at mkfs time, that's subvolid=5 (a.k.a. 0) and it
is set as the default subvolume. I don't see the point in having two
of them. If you want it, make it. If your distro wants it, it should
be done in the installer, not mkfs.

Further I think it's inappropriate to take 'btrfs sub set-default'
away from the user. That is a user owned setting. It is not OK for
some utility to assert domain over that setting, and depend on it for
proper booting. It makes the entire boot process undiscoverable,
breaks self-describing boot process which are simpler to understand
and troubleshoot, in favor of secret decoder ring booting that now
requires even more esoteric knowledge on the part of users. So I think
it's a bad design.

Instead those utilities should employ rootflags=subvol or subvolid to
explicitly use a particular fs tree for rootfs, rather that hide this
fact by using subvolume set-default.



-- 
Chris Murphy

Re: rollback to a snapshot and delete old top volume - missing of "@"

[Chris Murphy]

On Fri, Jul 8, 2016 at 3:39 PM, Chris Murphy <lists@colorremedies.com> wrote:
> On Fri, Jul 8, 2016 at 2:08 PM, Kai Herlemann <nesadaw@freenet.de> wrote:
>
>> If here any developers read along: I'd like to suggest that there's
>> automatically made a subvolume "@" by default, which is set as default
>> subvolume, or a tip to the distribution, that it would made sense to do that
>> with the installation. It would protect other users against confusion and
>> work like I had it.
>
> I think that upstream won't do that or recommend it. There is already
> a subvolume created at mkfs time, that's subvolid=5 (a.k.a. 0) and it
> is set as the default subvolume. I don't see the point in having two
> of them. If you want it, make it. If your distro wants it, it should
> be done in the installer, not mkfs.
>
> Further I think it's inappropriate to take 'btrfs sub set-default'
> away from the user. That is a user owned setting. It is not OK for
> some utility to assert domain over that setting, and depend on it for
> proper booting. It makes the entire boot process undiscoverable,
> breaks self-describing boot process which are simpler to understand
> and troubleshoot, in favor of secret decoder ring booting that now
> requires even more esoteric knowledge on the part of users. So I think
> it's a bad design.
>
> Instead those utilities should employ rootflags=subvol or subvolid to
> explicitly use a particular fs tree for rootfs, rather that hide this
> fact by using subvolume set-default.

The only distro installer I know that works this way out of the box is
Fedora/Red Hat's Anaconda. It leaves the default subvolume as 5, but
does not install the OS there. Instead each mountpoint is created as a
subvolume in that top level, and rootflags kernel parameter and fstab
are used to assemble those subvolumes per the FHS virtually. It's
completely discoverable, you can follow each step along the way, it's
not obscured.

The additional benefit is no nested subvolumes.

A possible improvement for those distros that will likely continue
doing things the way they are, would be if the kernel code stated what
fs tree ID was being mounted when the default subvolume is not 5, and
neither subvol nor subvolid mount options were used. *shrug*


-- 
Chris Murphy

Re: rollback to a snapshot and delete old top volume - missing of "@"

[Henk Slager]

On Fri, Jul 8, 2016 at 11:50 PM, Chris Murphy <lists@colorremedies.com> wrote:
> On Fri, Jul 8, 2016 at 3:39 PM, Chris Murphy <lists@colorremedies.com> wrote:
>> On Fri, Jul 8, 2016 at 2:08 PM, Kai Herlemann <nesadaw@freenet.de> wrote:
>>
>>> If here any developers read along: I'd like to suggest that there's
>>> automatically made a subvolume "@" by default, which is set as default
>>> subvolume, or a tip to the distribution, that it would made sense to do that
>>> with the installation. It would protect other users against confusion and
>>> work like I had it.
>>
>> I think that upstream won't do that or recommend it. There is already
>> a subvolume created at mkfs time, that's subvolid=5 (a.k.a. 0) and it
>> is set as the default subvolume. I don't see the point in having two
>> of them. If you want it, make it. If your distro wants it, it should
>> be done in the installer, not mkfs.
>>
>> Further I think it's inappropriate to take 'btrfs sub set-default'
>> away from the user. That is a user owned setting. It is not OK for
>> some utility to assert domain over that setting, and depend on it for
>> proper booting. It makes the entire boot process undiscoverable,
>> breaks self-describing boot process which are simpler to understand
>> and troubleshoot, in favor of secret decoder ring booting that now
>> requires even more esoteric knowledge on the part of users. So I think
>> it's a bad design.
>>
>> Instead those utilities should employ rootflags=subvol or subvolid to
>> explicitly use a particular fs tree for rootfs, rather that hide this
>> fact by using subvolume set-default.
>
> The only distro installer I know that works this way out of the box is
> Fedora/Red Hat's Anaconda. It leaves the default subvolume as 5, but
> does not install the OS there. Instead each mountpoint is created as a
> subvolume in that top level, and rootflags kernel parameter and fstab
> are used to assemble those subvolumes per the FHS virtually. It's
> completely discoverable, you can follow each step along the way, it's
> not obscured.
>
> The additional benefit is no nested subvolumes.
>
> A possible improvement for those distros that will likely continue
> doing things the way they are, would be if the kernel code stated what
> fs tree ID was being mounted when the default subvolume is not 5, and
> neither subvol nor subvolid mount options were used. *shrug*

On a running system as non-root:
$ mount | grep "on / type btrfs"
/dev/sda1 on / type btrfs
(rw,noatime,compress=lzo,ssd,discard,space_cache,subvolid=2429,subvol=/@/latestrootfs)

On an image of a disk or some separate disk with rootfs tree mounted
somewhere, I agree that it might look 'hidden'; you will have to
realize that the filesystem is Btrfs and that the default subvol might
not be 5, but  btrfs sub list / gives the answer to what more is in
the pool.

Re: rollback to a snapshot and delete old top volume - missing of "@"

[Chris Murphy]

On Thu, Jul 7, 2016 at 11:40 AM, Chris Murphy <lists@colorremedies.com> wrote:
> On Thu, Jul 7, 2016 at 10:01 AM, Henk Slager <eye1tm@gmail.com> wrote:
>
>> What the latest debian likes as naming convention I dont know, but in
>> openSuSE @ is a directory in the toplevel volume (ID=5 or ID=0 as
>> alias) and that directory contains subvolumes.
>
> No, opensuse doesn't use @ at all. They use a subvolume called
> .snapshots to contain snapper snapshots.

OK this has changed in openSUSE Tumbleweed. It does create an @
subvolume into which all other subvolumes are created including
.snapshots.

0:install:/mnt # btrfs sub list -t /mnt/
ID    gen    top level    path
--    ---    ---------    ----
257    31    5           @
258    12    257        @/.snapshots
259    37    258        @/.snapshots/1/snapshot
260    14    257        @/boot/grub2/i386-pc
261    15    257        @/boot/grub2/x86_64-efi
262    16    257        @/opt
263    17    257        @/srv
264    18    257        @/tmp
265    19    257        @/usr/local
266    35    257        @/var/cache
267    21    257        @/var/crash
268    23    257        @/var/lib/libvirt/images
269    23    257        @/var/lib/mailman
270    25    257        @/var/lib/mariadb
271    26    257        @/var/lib/mysql
272    26    257        @/var/lib/named
273    28    257        @/var/lib/pgsql
274    35    257        @/var/log
275    29    257        @/var/opt
276    30    257        @/var/spool
277    35    257        @/var/tmp

The installation time rootfs is
0:install:/mnt # mount | grep btrfs
/dev/vda2 on /mnt type btrfs
(rw,relatime,space_cache,subvolid=259,subvol=/@/.snapshots/1/snapshot)

I don't really understand the point of this additional layer of nesting under @.

I didn't test if it's still changing the default subvolume, rather
than using rootflags=subvol or subvolid.



-- 
Chris Murphy

Re: rollback to a snapshot and delete old top volume - missing of "@"

[Andrei Borzenkov]

09.07.2016 00:50, Chris Murphy пишет:
>>
>> Instead those utilities should employ rootflags=subvol or subvolid to
>> explicitly use a particular fs tree for rootfs, rather that hide this
>> fact by using subvolume set-default.
> 
> The only distro installer I know that works this way out of the box is
> Fedora/Red Hat's Anaconda. It leaves the default subvolume as 5, but
> does not install the OS there. Instead each mountpoint is created as a
> subvolume in that top level, and rootflags kernel parameter and fstab
> are used to assemble those subvolumes per the FHS virtually. It's
> completely discoverable, you can follow each step along the way, it's
> not obscured.
> 
> The additional benefit is no nested subvolumes.
> 

Does it use grub2? Where /boot/grub is located - on one of those
snapshots or on partition outside of btrfs control?

Does it support booting from previous read-only snapshot directly and/or
rollback to previous snapshot?

Re: rollback to a snapshot and delete old top volume - missing of "@"

[Chris Murphy]

On Fri, Jul 8, 2016 at 11:30 PM, Andrei Borzenkov <arvidjaar@gmail.com> wrote:
> 09.07.2016 00:50, Chris Murphy пишет:
>>>
>>> Instead those utilities should employ rootflags=subvol or subvolid to
>>> explicitly use a particular fs tree for rootfs, rather that hide this
>>> fact by using subvolume set-default.
>>
>> The only distro installer I know that works this way out of the box is
>> Fedora/Red Hat's Anaconda. It leaves the default subvolume as 5, but
>> does not install the OS there. Instead each mountpoint is created as a
>> subvolume in that top level, and rootflags kernel parameter and fstab
>> are used to assemble those subvolumes per the FHS virtually. It's
>> completely discoverable, you can follow each step along the way, it's
>> not obscured.
>>
>> The additional benefit is no nested subvolumes.
>>
>
> Does it use grub2? Where /boot/grub is located - on one of those
> snapshots or on partition outside of btrfs control?

GRUB yes. The installer only permits /boot on ext4 due an ancient
grubby (not GRUB) bug [1]. It's not dissimilar to openSUSE where /boot
is on ext4, and Btrfs ends up on encrypted LVM, if you choose to
encrypt. It's rather head shaking but that's the state of affairs.

> Does it support booting from previous read-only snapshot directly and/or
> rollback to previous snapshot?

Not by default. Snapper is in the repos.

It looks like the future of rollbacks on Fedora is to not do snapshots
at all, but to deploy binaries using rpm-ostree which provides atomic
OS updates on any file system. The update is only ever applied to a
new tree, not the currently active tree, so if the update fails that
new tree is just deleted, it's never even attempted for reboot. Some
of the directories, most notably /usr, are always read-only. Basically
this is a kind of stateless and therefore resettable machine. As far
as I know there are no optimizations for Btrfs, where either snapshots
or reflinks could be employed instead of depending on hardlinks.


-- 
Chris Murphy