WARNING at fs/btrfs/super.c:260 __btrfs_abort_transaction (error -17)

WARNING at fs/btrfs/super.c:260 __btrfs_abort_transaction (error -17)

[Sophie Dexter]

I'm given to understand that this is the right place to report a btrfs
problem, I apologise if not :-(

I have been using my router as a simple NFS NAS for around 2 years
with an ext3 formatted 2 TB Western Digital 2.5" USB Passport disk. I
have been slowly moving to BTRFS and thought it about time to convert
this disk too but unfortunately BTRFS is unreliable on my router :-(.
It doesn't take long for an error to happen causing a 'ro' remount.
However the disk is unreadable after the remount, both for NFS and
locally. Rebooting the router seems to be the only way to access the
disk again.

I also have a 1 GB swap partition on the disk although swap doesn't
appear to be a factor as the problem occurs whether or not swap is
enabled (this report is without swap).

I used my laptop to convert the fs to btrfs, not my router. My laptop
has Fedora 21 with 3.18 kernel and tools. No problems are found when I
use my laptop to check and scrub the disk (i.e. with the disk
connected directly to my laptop).

Thank you :-)
Sophie x

# uname -a
Linux OpenWrt 3.18.9 #1 Thu Mar 19 18:35:47 UTC 2015 mips GNU/Linux
# btrfs --version
Btrfs v3.17.3
# btrfs fi show
Label: '###########' uuid: ########-####-####-####-############
Total devices 1 FS bytes used 1.15TiB
devid 1 size 1.82TiB used 1.15TiB path /dev/sda1

Btrfs v3.17.3
# btrfs fi df /mnt/usb/
Data, single: total=1.15TiB, used=1.15TiB
System, single: total=32.00MiB, used=136.00KiB
Metadata, single: total=2.00GiB, used=1.36GiB
GlobalReserve, single: total=464.00MiB, used=0.00B

# dmesg
[ 0.000000] Linux version 3.18.9 (openwrt@gb-12) (gcc version 4.8.3
(OpenWrt/Linaro GCC 4.8-2014.04 r44879) ) #1 Thu Mar 19 18:35:47 UTC
2015
[ 0.000000] MyLoader: sysp=fff6fffc, boardp=7effffab, parts=dfffffff
[ 0.000000] bootconsole [early0] enabled
[ 0.000000] CPU0 revision is: 00019374 (MIPS 24Kc)
[ 0.000000] SoC: Atheros AR7241 rev 1
[ 0.000000] Determined physical RAM map:
[ 0.000000] memory: 04000000 @ 00000000 (usable)
[ 0.000000] Initrd not found or empty - disabling initrd
[ 0.000000] Zone ranges:
[ 0.000000] Normal [mem 0x00000000-0x03ffffff]
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x00000000-0x03ffffff]
[ 0.000000] Initmem setup node 0 [mem 0x00000000-0x03ffffff]
[ 0.000000] On node 0 totalpages: 16384
[ 0.000000] free_area_init_node: node 0, pgdat 803822b0, node_mem_map 81000000
[ 0.000000] Normal zone: 128 pages used for memmap
[ 0.000000] Normal zone: 0 pages reserved
[ 0.000000] Normal zone: 16384 pages, LIFO batch:3
[ 0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 32 bytes.
[ 0.000000] Primary data cache 32kB, 4-way, VIPT, cache aliases,
linesize 32 bytes
[ 0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[ 0.000000] pcpu-alloc: [0] 0
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on.
Total pages: 16256
[ 0.000000] Kernel command line: board=TL-MR3420 console=ttyS0,115200
rootfstype=squashfs,jffs2 noinitrd
[ 0.000000] PID hash table entries: 256 (order: -2, 1024 bytes)
[ 0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
[ 0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.000000] Writing ErrCtl register=00000000
[ 0.000000] Readback ErrCtl register=00000000
[ 0.000000] Memory: 60812K/65536K available (2631K kernel code, 127K
rwdata, 544K rodata, 208K init, 193K bss, 4724K reserved)
[ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] NR_IRQS:51
[ 0.000000] Clocks: CPU:400.000MHz, DDR:400.000MHz, AHB:200.000MHz, Ref:5.000MHz
[ 0.000000] Calibrating delay loop... 265.42 BogoMIPS (lpj=1327104)
[ 0.080000] pid_max: default: 32768 minimum: 301
[ 0.080000] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.090000] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.100000] NET: Registered protocol family 16
[ 0.100000] MIPS: machine is TP-LINK TL-MR3420
[ 0.550000] registering PCI controller with io_map_base unset
[ 0.590000] PCI host bridge to bus 0000:00
[ 0.600000] pci_bus 0000:00: root bus resource [mem 0x10000000-0x13ffffff]
[ 0.600000] pci_bus 0000:00: root bus resource [io 0x0000]
[ 0.610000] pci_bus 0000:00: No busn resource found for root bus, will
use [bus 00-ff]
[ 0.610000] pci 0000:00:00.0: [168c:ff1c] type 00 class 0x020000
[ 0.610000] pci 0000:00:00.0: fixup device configuration
[ 0.620000] pci 0000:00:00.0: reg 0x10: [mem 0x00000000-0x0000ffff 64bit]
[ 0.620000] pci 0000:00:00.0: supports D1
[ 0.620000] pci 0000:00:00.0: PME# supported from D0 D1 D3hot
[ 0.620000] pci_bus 0000:00: busn_res: [bus 00-ff] end is updated to 00
[ 0.620000] pci 0000:00:00.0: BAR 0: assigned [mem 0x10000000-0x1000ffff 64bit]
[ 0.620000] pci 0000:00:00.0: using irq 40 for pin 1
[ 0.630000] Switched to clocksource MIPS
[ 0.630000] NET: Registered protocol family 2
[ 0.640000] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.640000] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.650000] TCP: Hash tables configured (established 1024 bind 1024)
[ 0.660000] TCP: reno registered
[ 0.660000] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 0.670000] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 0.670000] NET: Registered protocol family 1
[ 0.680000] PCI: CLS 0 bytes, default 32
[ 0.680000] futex hash table entries: 256 (order: -1, 3072 bytes)
[ 0.690000] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 0.700000] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME)
(CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[ 0.710000] msgmni has been set to 118
[ 0.720000] io scheduler noop registered
[ 0.720000] io scheduler deadline registered (default)
[ 0.720000] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[ 0.740000] console [ttyS0] disabled
[ 0.760000] serial8250.0: ttyS0 at MMIO 0x18020000 (irq = 11,
base_baud = 12500000) is a 16550A
[ 0.770000] console [ttyS0] enabled
[ 0.770000] bootconsole [early0] disabled
[ 0.780000] m25p80 spi0.0: found s25fl129p1, expected m25p80
[ 0.790000] m25p80 spi0.0: s25fl129p1 (16384 Kbytes)
[ 0.800000] 5 tp-link partitions found on MTD device spi0.0
[ 0.800000] Creating 5 MTD partitions on "spi0.0":
[ 0.810000] 0x000000000000-0x000000020000 : "u-boot"
[ 0.810000] 0x000000020000-0x000000149000 : "kernel"
[ 0.820000] mtd: partition "kernel" must either start or end on erase
block boundary or be smaller than an erase block -- forcing read-only
[ 0.830000] 0x000000149000-0x000000ff0000 : "rootfs"
[ 0.840000] mtd: partition "rootfs" must either start or end on erase
block boundary or be smaller than an erase block -- forcing read-only
[ 0.850000] mtd: device 2 (rootfs) set to be root filesystem
[ 0.860000] 1 squashfs-split partitions found on MTD device rootfs
[ 0.860000] 0x000000330000-0x000000ff0000 : "rootfs_data"
[ 0.870000] 0x000000ff0000-0x000001000000 : "art"
[ 0.870000] 0x000000020000-0x000000ff0000 : "firmware"
[ 0.920000] libphy: ag71xx_mdio: probed
[ 1.510000] ag71xx-mdio.1: Found an AR7240/AR9330 built-in switch
[ 1.550000] eth0: Atheros AG71xx at 0xba000000, irq 5, mode:GMII
[ 2.140000] ag71xx ag71xx.0: connected to PHY at ag71xx-mdio.1:04
[uid=004dd041, driver=Generic PHY]
[ 2.150000] eth1: Atheros AG71xx at 0xb9000000, irq 4, mode:MII
[ 2.150000] TCP: cubic registered
[ 2.160000] NET: Registered protocol family 17
[ 2.160000] bridge: automatic filtering via arp/ip/ip6tables has been
deprecated. Update your scripts to load br_netfilter if you need this.
[ 2.180000] Bridge firewalling registered
[ 2.180000] 8021q: 802.1Q VLAN Support v1.8
[ 2.190000] VFS: Mounted root (squashfs filesystem) readonly on device 31:2.
[ 2.200000] Freeing unused kernel memory: 208K (8039c000 - 803d0000)
[ 3.460000] init: Console is alive
[ 3.460000] init: - watchdog -
[ 5.020000] usbcore: registered new interface driver usbfs
[ 5.030000] usbcore: registered new interface driver hub
[ 5.030000] usbcore: registered new device driver usb
[ 5.040000] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 5.050000] ehci-platform: EHCI generic platform driver
[ 5.060000] ehci-platform ehci-platform: EHCI Host Controller
[ 5.060000] ehci-platform ehci-platform: new USB bus registered,
assigned bus number 1
[ 5.070000] ehci-platform ehci-platform: irq 3, io mem 0x1b000000
[ 5.100000] ehci-platform ehci-platform: USB 2.0 started, EHCI 1.00
[ 5.100000] hub 1-0:1.0: USB hub found
[ 5.110000] hub 1-0:1.0: 1 port detected
[ 5.110000] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 5.120000] ohci-platform: OHCI generic platform driver
[ 5.430000] usb 1-1: new high-speed USB device number 2 using ehci-platform
[ 5.550000] init: - preinit -
[ 6.360000] random: procd urandom read with 10 bits of entropy available
[ 8.440000] eth0: link up (1000Mbps/Full duplex)
[ 9.740000] jffs2: notice: (360) jffs2_build_xattr_subsystem: complete
building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan) and 0 of
xref (0 dead, 0 orphan) found.
[ 9.770000] mount_root: loading kmods from internal overlay
[ 11.540000] raid6: int32x1 17 MB/s
[ 11.710000] raid6: int32x2 34 MB/s
[ 11.880000] raid6: int32x4 60 MB/s
[ 12.050000] raid6: int32x8 56 MB/s
[ 12.050000] raid6: using algorithm int32x4 (60 MB/s)
[ 12.050000] raid6: using intx1 recovery algorithm
[ 12.060000] xor: measuring software checksum speed
[ 12.170000] 8regs : 295.600 MB/sec
[ 12.270000] 8regs_prefetch: 281.600 MB/sec
[ 12.370000] 32regs : 326.800 MB/sec
[ 12.470000] 32regs_prefetch: 309.600 MB/sec
[ 12.470000] xor: using function: 32regs (326.800 MB/sec)
[ 13.070000] Btrfs loaded
[ 13.240000] SCSI subsystem initialized
[ 13.250000] usb-storage 1-1:1.0: USB Mass Storage device detected
[ 13.260000] scsi host0: usb-storage 1-1:1.0
[ 13.260000] usbcore: registered new interface driver usb-storage
[ 13.540000] block: attempting to load /tmp/jffs_cfg/upper/etc/config/fstab
[ 13.550000] block: extroot: not configured
[ 13.550000] mount_root: switching to jffs2 overlay
[ 13.610000] eth0: link down
[ 13.650000] procd: - early -
[ 13.650000] procd: - watchdog -
[ 14.260000] scsi 0:0:0:0: Direct-Access WD My Passport 0748 1015 PQ: 0 ANSI: 6
[ 14.270000] sd 0:0:0:0: [sda] 3906963456 512-byte logical blocks:
(2.00 TB/1.81 TiB)
[ 14.290000] scsi 0:0:0:1: Enclosure WD SES Device 1015 PQ: 0 ANSI: 6
[ 14.290000] sd 0:0:0:0: [sda] Write Protect is off
[ 14.300000] sd 0:0:0:0: [sda] Mode Sense: 47 00 10 08
[ 14.300000] sd 0:0:0:0: [sda] No Caching mode page found
[ 14.310000] sd 0:0:0:0: [sda] Assuming drive cache: write through
[ 14.370000] sda: sda1 sda2
[ 14.390000] sd 0:0:0:0: [sda] Attached SCSI disk
[ 14.890000] procd: - ubus -
[ 15.040000] BTRFS: device label Media Share devid 1 transid 13977 /dev/sda1
[ 15.050000] BTRFS info (device sda1): disk space caching is enabled
[ 15.900000] procd: - init -
[ 17.190000] NET: Registered protocol family 10
[ 17.200000] Key type dns_resolver registered
[ 17.270000] RPC: Registered named UNIX socket transport module.
[ 17.280000] RPC: Registered udp transport module.
[ 17.280000] RPC: Registered tcp transport module.
[ 17.290000] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 17.350000] Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
[ 17.360000] ip6_tables: (C) 2000-2006 Netfilter Core Team
[ 17.390000] Loading modules backported from Linux version
master-2015-03-09-0-g141f155
[ 17.400000] Backport generated by backports.git backports-20150129-0-gdd4a670
[ 17.410000] ip_tables: (C) 2000-2006 Netfilter Core Team
[ 17.430000] nf_conntrack version 0.5.0 (953 buckets, 3812 max)
[ 17.510000] xt_time: kernel timezone is -0000
[ 17.550000] cfg80211: Calling CRDA to update world regulatory domain
[ 17.580000] cfg80211: World regulatory domain updated:
[ 17.580000] cfg80211: DFS Master region: unset
[ 17.580000] cfg80211: (start_freq - end_freq @ bandwidth),
(max_antenna_gain, max_eirp), (dfs_cac_time)
[ 17.590000] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A,
2000 mBm), (N/A)
[ 17.600000] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (N/A,
2000 mBm), (N/A)
[ 17.610000] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (N/A,
2000 mBm), (N/A)
[ 17.620000] cfg80211: (5170000 KHz - 5250000 KHz @ 80000 KHz), (N/A,
2000 mBm), (N/A)
[ 17.630000] cfg80211: (5250000 KHz - 5330000 KHz @ 80000 KHz, 160000
KHz AUTO), (N/A, 2000 mBm), (0 s)
[ 17.640000] cfg80211: (5490000 KHz - 5730000 KHz @ 160000 KHz), (N/A,
2000 mBm), (0 s)
[ 17.640000] cfg80211: (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A,
2000 mBm), (N/A)
[ 17.650000] cfg80211: (57240000 KHz - 63720000 KHz @ 2160000 KHz),
(N/A, 0 mBm), (N/A)
[ 17.710000] PPP generic driver version 2.4.2
[ 17.720000] NET: Registered protocol family 24
[ 17.780000] PCI: Enabling device 0000:00:00.0 (0000 -> 0002)
[ 17.800000] ath: EEPROM regdomain: 0x0
[ 17.800000] ath: EEPROM indicates default country code should be used
[ 17.800000] ath: doing EEPROM country->regdmn map search
[ 17.800000] ath: country maps to regdmn code: 0x3a
[ 17.800000] ath: Country alpha2 being used: US
[ 17.800000] ath: Regpair used: 0x3a
[ 17.810000] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[ 17.820000] ieee80211 phy0: Atheros AR9287 Rev:2 mem=0xb0000000, irq=40
[ 17.830000] cfg80211: Calling CRDA for country: US
[ 17.830000] cfg80211: Regulatory domain changed to country: US
[ 17.840000] cfg80211: DFS Master region: FCC
[ 17.840000] cfg80211: (start_freq - end_freq @ bandwidth),
(max_antenna_gain, max_eirp), (dfs_cac_time)
[ 17.850000] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A,
3000 mBm), (N/A)
[ 17.860000] cfg80211: (5170000 KHz - 5250000 KHz @ 80000 KHz, 160000
KHz AUTO), (N/A, 1700 mBm), (N/A)
[ 17.870000] cfg80211: (5250000 KHz - 5330000 KHz @ 80000 KHz, 160000
KHz AUTO), (N/A, 2300 mBm), (0 s)
[ 17.880000] cfg80211: (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A,
3000 mBm), (N/A)
[ 17.890000] cfg80211: (57240000 KHz - 63720000 KHz @ 2160000 KHz),
(N/A, 4000 mBm), (N/A)
[ 18.250000] random: nonblocking pool is initialized
[ 33.130000] device eth0 entered promiscuous mode
[ 33.130000] IPv6: ADDRCONF(NETDEV_UP): br-lan: link is not ready
[ 33.190000] device eth1 entered promiscuous mode
[ 33.190000] br-lan: port 2(eth1) entered forwarding state
[ 33.200000] br-lan: port 2(eth1) entered forwarding state
[ 33.200000] IPv6: ADDRCONF(NETDEV_CHANGE): br-lan: link becomes ready
[ 34.170000] br-lan: port 2(eth1) entered disabled state
[ 34.770000] eth0: link up (1000Mbps/Full duplex)
[ 34.770000] br-lan: port 1(eth0) entered forwarding state
[ 34.780000] br-lan: port 1(eth0) entered forwarding state
[ 35.730000] eth1: link up (100Mbps/Full duplex)
[ 35.730000] br-lan: port 2(eth1) entered forwarding state
[ 35.740000] br-lan: port 2(eth1) entered forwarding state
[ 35.960000] svc: failed to register lockdv1 RPC service (errno 124).
[ 36.780000] br-lan: port 1(eth0) entered forwarding state
[ 37.740000] br-lan: port 2(eth1) entered forwarding state
[ 265.110000] ------------[ cut here ]------------
[ 265.110000] WARNING: CPU: 0 PID: 831 at fs/btrfs/super.c:260
__btrfs_abort_transaction+0x74/0x150 [btrfs]()
[ 265.120000] BTRFS: Transaction aborted (error -17)
[ 265.130000] Modules linked in: ath9k ath9k_common pppoe ppp_async
iptable_nat ath9k_hw ath pppox ppp_generic nf_nat_ipv4
nf_conntrack_ipv6 nf_conntrack_ipv4 mac80211 ipt_REJECT ipt_MASQUERADE
cfg80211 xt_time xt_tcpudp xt_state xt_nat xt_multiport xt_mark xt_mac
xt_limit xt_id xt_conntrack xt_comment xt_TCPMSS xt_REDIRECT xt_LOG
xt_CT slhc nf_reject_ipv4 nf_nat_masquerade_ipv4 nf_nat_irc nf_nat_ftp
nf_nat nf_log_ipv4 nf_defrag_ipv6 nf_defrag_ipv4 nf_conntrack_rtcache
nf_conntrack_irc nf_conntrack_ftp nf_conntrack libcrc32c iptable_raw
iptable_mangle iptable_filter ip_tables crc_ccitt compat
ledtrig_usbdev ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 nf_log_common
ip6table_raw ip6table_mangle ip6table_filter ip6_tables x_tables nfsd
nfsv3 nfs lockd sunrpc grace dns_resolver ipv6 arc4 crypto_blkcipher
usb_storage sd_mod scsi_mod ext4 crc16 jbd2 mbcache btrfs zlib_inflate
zlib_deflate xor raid6_pq lzo_decompress lzo_compress exportfs
crc32c_generic crypto_hash ohci_platform ohci_hcd ehci_platform
ehci_hcd gpio_button_hotplug usbcore nls_base usb_common
[ 265.220000] CPU: 0 PID: 831 Comm: btrfs-transacti Not tainted 3.18.9 #1
[ 265.230000] Stack : 00000000 00000000 00000000 00000000 803fe10a
0000003b 00000000 832012e0
[ 265.230000] 00000001 8359fed8 8033fd38 8038df63 0000033f 803f3b80
83a195a8 8359fed8
[ 265.230000] 832b6dfc 00000000 832c0000 802cf89c 00000003 8022ae14
00000104 8359fed8
[ 265.230000] 80342e54 825bdc6c 00000000 00000000 00000000 00000000
00000000 00000000
[ 265.230000] 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000
[ 265.230000] ...
[ 265.260000] Call Trace:
[ 265.270000] [<802718d8>] show_stack+0x48/0x70
[ 265.270000] [<802e0c48>] warn_slowpath_common+0x84/0xb4
[ 265.280000] [<802e0ca4>] warn_slowpath_fmt+0x2c/0x38
[ 265.280000] [<832012e0>] __btrfs_abort_transaction+0x74/0x150 [btrfs]
[ 265.290000] [<832206e4>] btrfs_run_delayed_refs+0xa0/0x318 [btrfs]
[ 265.290000] [<83220bb8>] btrfs_write_dirty_block_groups+0x25c/0x650 [btrfs]
[ 265.300000] [<832b3df4>] btrfs_crc32c+0x514/0x1418 [btrfs]
[ 265.310000]
[ 265.310000] ---[ end trace e1e1a04204a7499b ]---
[ 265.310000] BTRFS: error (device sda1) in
btrfs_run_delayed_refs:2792: errno=-17 Object already exists
[ 265.320000] BTRFS info (device sda1): forced readonly
[ 265.350000] BTRFS warning (device sda1): Skipping commit of aborted
transaction.
[ 265.360000] BTRFS: error (device sda1) in cleanup_transaction:1607:
errno=-17 Object already exists

# cat /proc/meminfo
MemTotal: 61020 kB
MemFree: 2784 kB
MemAvailable: 40044 kB
Buffers: 1736 kB
Cached: 35768 kB
SwapCached: 0 kB
Active: 20292 kB
Inactive: 19244 kB
Active(anon): 2952 kB
Inactive(anon): 32 kB
Active(file): 17340 kB
Inactive(file): 19212 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 0 kB
Writeback: 0 kB
AnonPages: 2064 kB
Mapped: 1428 kB
Shmem: 920 kB
Slab: 11460 kB
SReclaimable: 4392 kB
SUnreclaim: 7068 kB
KernelStack: 592 kB
PageTables: 284 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 30508 kB
Committed_AS: 5848 kB
VmallocTotal: 1048372 kB
VmallocUsed: 1612 kB
VmallocChunk: 1026496 kB

Re: WARNING at fs/btrfs/super.c:260 __btrfs_abort_transaction (error -17)

[Sophie Dexter]

On 20/03/2015 15:19, Sophie Dexter wrote:
> I'm given to understand that this is the right place to report a btrfs
> problem, I apologise if not :-(
>
> I have been using my router as a simple NFS NAS for around 2 years
> with an ext3 formatted 2 TB Western Digital 2.5" USB Passport disk. I
> have been slowly moving to BTRFS and thought it about time to convert
> this disk too but unfortunately BTRFS is unreliable on my router :-(.
> It doesn't take long for an error to happen causing a 'ro' remount.
> However the disk is unreadable after the remount, both for NFS and
> locally. Rebooting the router seems to be the only way to access the
> disk again.
>
> I also have a 1 GB swap partition on the disk although swap doesn't
> appear to be a factor as the problem occurs whether or not swap is
> enabled (this report is without swap).
>
> I used my laptop to convert the fs to btrfs, not my router. My laptop
> has Fedora 21 with 3.18 kernel and tools. No problems are found when I
> use my laptop to check and scrub the disk (i.e. with the disk
> connected directly to my laptop).
>
> Thank you :-)
> Sophie x
>
> # uname -a
> Linux OpenWrt 3.18.9 #1 Thu Mar 19 18:35:47 UTC 2015 mips GNU/Linux
> # btrfs --version
> Btrfs v3.17.3
> # btrfs fi show
> Label: '###########' uuid: ########-####-####-####-############
> Total devices 1 FS bytes used 1.15TiB
> devid 1 size 1.82TiB used 1.15TiB path /dev/sda1
>
> Btrfs v3.17.3
> # btrfs fi df /mnt/usb/
> Data, single: total=1.15TiB, used=1.15TiB
> System, single: total=32.00MiB, used=136.00KiB
> Metadata, single: total=2.00GiB, used=1.36GiB
> GlobalReserve, single: total=464.00MiB, used=0.00B
>
> # dmesg
> [ 0.000000] Linux version 3.18.9 (openwrt@gb-12) (gcc version 4.8.3
> (OpenWrt/Linaro GCC 4.8-2014.04 r44879) ) #1 Thu Mar 19 18:35:47 UTC
> 2015
> [ 0.000000] MyLoader: sysp=fff6fffc, boardp=7effffab, parts=dfffffff
> [ 0.000000] bootconsole [early0] enabled
> [ 0.000000] CPU0 revision is: 00019374 (MIPS 24Kc)
> [ 0.000000] SoC: Atheros AR7241 rev 1
> [ 0.000000] Determined physical RAM map:
> [ 0.000000] memory: 04000000 @ 00000000 (usable)
> [ 0.000000] Initrd not found or empty - disabling initrd
> [ 0.000000] Zone ranges:
> [ 0.000000] Normal [mem 0x00000000-0x03ffffff]
> [ 0.000000] Movable zone start for each node
> [ 0.000000] Early memory node ranges
> [ 0.000000] node 0: [mem 0x00000000-0x03ffffff]
> [ 0.000000] Initmem setup node 0 [mem 0x00000000-0x03ffffff]
> [ 0.000000] On node 0 totalpages: 16384
> [ 0.000000] free_area_init_node: node 0, pgdat 803822b0, node_mem_map 81000000
> [ 0.000000] Normal zone: 128 pages used for memmap
> [ 0.000000] Normal zone: 0 pages reserved
> [ 0.000000] Normal zone: 16384 pages, LIFO batch:3
> [ 0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 32 bytes.
> [ 0.000000] Primary data cache 32kB, 4-way, VIPT, cache aliases,
> linesize 32 bytes
> [ 0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
> [ 0.000000] pcpu-alloc: [0] 0
> [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on.
> Total pages: 16256
> [ 0.000000] Kernel command line: board=TL-MR3420 console=ttyS0,115200
> rootfstype=squashfs,jffs2 noinitrd
> [ 0.000000] PID hash table entries: 256 (order: -2, 1024 bytes)
> [ 0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
> [ 0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
> [ 0.000000] Writing ErrCtl register=00000000
> [ 0.000000] Readback ErrCtl register=00000000
> [ 0.000000] Memory: 60812K/65536K available (2631K kernel code, 127K
> rwdata, 544K rodata, 208K init, 193K bss, 4724K reserved)
> [ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
> [ 0.000000] NR_IRQS:51
> [ 0.000000] Clocks: CPU:400.000MHz, DDR:400.000MHz, AHB:200.000MHz, Ref:5.000MHz
> [ 0.000000] Calibrating delay loop... 265.42 BogoMIPS (lpj=1327104)
> [ 0.080000] pid_max: default: 32768 minimum: 301
> [ 0.080000] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
> [ 0.090000] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
> [ 0.100000] NET: Registered protocol family 16
> [ 0.100000] MIPS: machine is TP-LINK TL-MR3420
> [ 0.550000] registering PCI controller with io_map_base unset
> [ 0.590000] PCI host bridge to bus 0000:00
> [ 0.600000] pci_bus 0000:00: root bus resource [mem 0x10000000-0x13ffffff]
> [ 0.600000] pci_bus 0000:00: root bus resource [io 0x0000]
> [ 0.610000] pci_bus 0000:00: No busn resource found for root bus, will
> use [bus 00-ff]
> [ 0.610000] pci 0000:00:00.0: [168c:ff1c] type 00 class 0x020000
> [ 0.610000] pci 0000:00:00.0: fixup device configuration
> [ 0.620000] pci 0000:00:00.0: reg 0x10: [mem 0x00000000-0x0000ffff 64bit]
> [ 0.620000] pci 0000:00:00.0: supports D1
> [ 0.620000] pci 0000:00:00.0: PME# supported from D0 D1 D3hot
> [ 0.620000] pci_bus 0000:00: busn_res: [bus 00-ff] end is updated to 00
> [ 0.620000] pci 0000:00:00.0: BAR 0: assigned [mem 0x10000000-0x1000ffff 64bit]
> [ 0.620000] pci 0000:00:00.0: using irq 40 for pin 1
> [ 0.630000] Switched to clocksource MIPS
> [ 0.630000] NET: Registered protocol family 2
> [ 0.640000] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
> [ 0.640000] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
> [ 0.650000] TCP: Hash tables configured (established 1024 bind 1024)
> [ 0.660000] TCP: reno registered
> [ 0.660000] UDP hash table entries: 256 (order: 0, 4096 bytes)
> [ 0.670000] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
> [ 0.670000] NET: Registered protocol family 1
> [ 0.680000] PCI: CLS 0 bytes, default 32
> [ 0.680000] futex hash table entries: 256 (order: -1, 3072 bytes)
> [ 0.690000] squashfs: version 4.0 (2009/01/31) Phillip Lougher
> [ 0.700000] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME)
> (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
> [ 0.710000] msgmni has been set to 118
> [ 0.720000] io scheduler noop registered
> [ 0.720000] io scheduler deadline registered (default)
> [ 0.720000] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
> [ 0.740000] console [ttyS0] disabled
> [ 0.760000] serial8250.0: ttyS0 at MMIO 0x18020000 (irq = 11,
> base_baud = 12500000) is a 16550A
> [ 0.770000] console [ttyS0] enabled
> [ 0.770000] bootconsole [early0] disabled
> [ 0.780000] m25p80 spi0.0: found s25fl129p1, expected m25p80
> [ 0.790000] m25p80 spi0.0: s25fl129p1 (16384 Kbytes)
> [ 0.800000] 5 tp-link partitions found on MTD device spi0.0
> [ 0.800000] Creating 5 MTD partitions on "spi0.0":
> [ 0.810000] 0x000000000000-0x000000020000 : "u-boot"
> [ 0.810000] 0x000000020000-0x000000149000 : "kernel"
> [ 0.820000] mtd: partition "kernel" must either start or end on erase
> block boundary or be smaller than an erase block -- forcing read-only
> [ 0.830000] 0x000000149000-0x000000ff0000 : "rootfs"
> [ 0.840000] mtd: partition "rootfs" must either start or end on erase
> block boundary or be smaller than an erase block -- forcing read-only
> [ 0.850000] mtd: device 2 (rootfs) set to be root filesystem
> [ 0.860000] 1 squashfs-split partitions found on MTD device rootfs
> [ 0.860000] 0x000000330000-0x000000ff0000 : "rootfs_data"
> [ 0.870000] 0x000000ff0000-0x000001000000 : "art"
> [ 0.870000] 0x000000020000-0x000000ff0000 : "firmware"
> [ 0.920000] libphy: ag71xx_mdio: probed
> [ 1.510000] ag71xx-mdio.1: Found an AR7240/AR9330 built-in switch
> [ 1.550000] eth0: Atheros AG71xx at 0xba000000, irq 5, mode:GMII
> [ 2.140000] ag71xx ag71xx.0: connected to PHY at ag71xx-mdio.1:04
> [uid=004dd041, driver=Generic PHY]
> [ 2.150000] eth1: Atheros AG71xx at 0xb9000000, irq 4, mode:MII
> [ 2.150000] TCP: cubic registered
> [ 2.160000] NET: Registered protocol family 17
> [ 2.160000] bridge: automatic filtering via arp/ip/ip6tables has been
> deprecated. Update your scripts to load br_netfilter if you need this.
> [ 2.180000] Bridge firewalling registered
> [ 2.180000] 8021q: 802.1Q VLAN Support v1.8
> [ 2.190000] VFS: Mounted root (squashfs filesystem) readonly on device 31:2.
> [ 2.200000] Freeing unused kernel memory: 208K (8039c000 - 803d0000)
> [ 3.460000] init: Console is alive
> [ 3.460000] init: - watchdog -
> [ 5.020000] usbcore: registered new interface driver usbfs
> [ 5.030000] usbcore: registered new interface driver hub
> [ 5.030000] usbcore: registered new device driver usb
> [ 5.040000] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
> [ 5.050000] ehci-platform: EHCI generic platform driver
> [ 5.060000] ehci-platform ehci-platform: EHCI Host Controller
> [ 5.060000] ehci-platform ehci-platform: new USB bus registered,
> assigned bus number 1
> [ 5.070000] ehci-platform ehci-platform: irq 3, io mem 0x1b000000
> [ 5.100000] ehci-platform ehci-platform: USB 2.0 started, EHCI 1.00
> [ 5.100000] hub 1-0:1.0: USB hub found
> [ 5.110000] hub 1-0:1.0: 1 port detected
> [ 5.110000] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
> [ 5.120000] ohci-platform: OHCI generic platform driver
> [ 5.430000] usb 1-1: new high-speed USB device number 2 using ehci-platform
> [ 5.550000] init: - preinit -
> [ 6.360000] random: procd urandom read with 10 bits of entropy available
> [ 8.440000] eth0: link up (1000Mbps/Full duplex)
> [ 9.740000] jffs2: notice: (360) jffs2_build_xattr_subsystem: complete
> building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan) and 0 of
> xref (0 dead, 0 orphan) found.
> [ 9.770000] mount_root: loading kmods from internal overlay
> [ 11.540000] raid6: int32x1 17 MB/s
> [ 11.710000] raid6: int32x2 34 MB/s
> [ 11.880000] raid6: int32x4 60 MB/s
> [ 12.050000] raid6: int32x8 56 MB/s
> [ 12.050000] raid6: using algorithm int32x4 (60 MB/s)
> [ 12.050000] raid6: using intx1 recovery algorithm
> [ 12.060000] xor: measuring software checksum speed
> [ 12.170000] 8regs : 295.600 MB/sec
> [ 12.270000] 8regs_prefetch: 281.600 MB/sec
> [ 12.370000] 32regs : 326.800 MB/sec
> [ 12.470000] 32regs_prefetch: 309.600 MB/sec
> [ 12.470000] xor: using function: 32regs (326.800 MB/sec)
> [ 13.070000] Btrfs loaded
> [ 13.240000] SCSI subsystem initialized
> [ 13.250000] usb-storage 1-1:1.0: USB Mass Storage device detected
> [ 13.260000] scsi host0: usb-storage 1-1:1.0
> [ 13.260000] usbcore: registered new interface driver usb-storage
> [ 13.540000] block: attempting to load /tmp/jffs_cfg/upper/etc/config/fstab
> [ 13.550000] block: extroot: not configured
> [ 13.550000] mount_root: switching to jffs2 overlay
> [ 13.610000] eth0: link down
> [ 13.650000] procd: - early -
> [ 13.650000] procd: - watchdog -
> [ 14.260000] scsi 0:0:0:0: Direct-Access WD My Passport 0748 1015 PQ: 0 ANSI: 6
> [ 14.270000] sd 0:0:0:0: [sda] 3906963456 512-byte logical blocks:
> (2.00 TB/1.81 TiB)
> [ 14.290000] scsi 0:0:0:1: Enclosure WD SES Device 1015 PQ: 0 ANSI: 6
> [ 14.290000] sd 0:0:0:0: [sda] Write Protect is off
> [ 14.300000] sd 0:0:0:0: [sda] Mode Sense: 47 00 10 08
> [ 14.300000] sd 0:0:0:0: [sda] No Caching mode page found
> [ 14.310000] sd 0:0:0:0: [sda] Assuming drive cache: write through
> [ 14.370000] sda: sda1 sda2
> [ 14.390000] sd 0:0:0:0: [sda] Attached SCSI disk
> [ 14.890000] procd: - ubus -
> [ 15.040000] BTRFS: device label Media Share devid 1 transid 13977 /dev/sda1
> [ 15.050000] BTRFS info (device sda1): disk space caching is enabled
> [ 15.900000] procd: - init -
> [ 17.190000] NET: Registered protocol family 10
> [ 17.200000] Key type dns_resolver registered
> [ 17.270000] RPC: Registered named UNIX socket transport module.
> [ 17.280000] RPC: Registered udp transport module.
> [ 17.280000] RPC: Registered tcp transport module.
> [ 17.290000] RPC: Registered tcp NFSv4.1 backchannel transport module.
> [ 17.350000] Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
> [ 17.360000] ip6_tables: (C) 2000-2006 Netfilter Core Team
> [ 17.390000] Loading modules backported from Linux version
> master-2015-03-09-0-g141f155
> [ 17.400000] Backport generated by backports.git backports-20150129-0-gdd4a670
> [ 17.410000] ip_tables: (C) 2000-2006 Netfilter Core Team
> [ 17.430000] nf_conntrack version 0.5.0 (953 buckets, 3812 max)
> [ 17.510000] xt_time: kernel timezone is -0000
> [ 17.550000] cfg80211: Calling CRDA to update world regulatory domain
> [ 17.580000] cfg80211: World regulatory domain updated:
> [ 17.580000] cfg80211: DFS Master region: unset
> [ 17.580000] cfg80211: (start_freq - end_freq @ bandwidth),
> (max_antenna_gain, max_eirp), (dfs_cac_time)
> [ 17.590000] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A,
> 2000 mBm), (N/A)
> [ 17.600000] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (N/A,
> 2000 mBm), (N/A)
> [ 17.610000] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (N/A,
> 2000 mBm), (N/A)
> [ 17.620000] cfg80211: (5170000 KHz - 5250000 KHz @ 80000 KHz), (N/A,
> 2000 mBm), (N/A)
> [ 17.630000] cfg80211: (5250000 KHz - 5330000 KHz @ 80000 KHz, 160000
> KHz AUTO), (N/A, 2000 mBm), (0 s)
> [ 17.640000] cfg80211: (5490000 KHz - 5730000 KHz @ 160000 KHz), (N/A,
> 2000 mBm), (0 s)
> [ 17.640000] cfg80211: (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A,
> 2000 mBm), (N/A)
> [ 17.650000] cfg80211: (57240000 KHz - 63720000 KHz @ 2160000 KHz),
> (N/A, 0 mBm), (N/A)
> [ 17.710000] PPP generic driver version 2.4.2
> [ 17.720000] NET: Registered protocol family 24
> [ 17.780000] PCI: Enabling device 0000:00:00.0 (0000 -> 0002)
> [ 17.800000] ath: EEPROM regdomain: 0x0
> [ 17.800000] ath: EEPROM indicates default country code should be used
> [ 17.800000] ath: doing EEPROM country->regdmn map search
> [ 17.800000] ath: country maps to regdmn code: 0x3a
> [ 17.800000] ath: Country alpha2 being used: US
> [ 17.800000] ath: Regpair used: 0x3a
> [ 17.810000] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
> [ 17.820000] ieee80211 phy0: Atheros AR9287 Rev:2 mem=0xb0000000, irq=40
> [ 17.830000] cfg80211: Calling CRDA for country: US
> [ 17.830000] cfg80211: Regulatory domain changed to country: US
> [ 17.840000] cfg80211: DFS Master region: FCC
> [ 17.840000] cfg80211: (start_freq - end_freq @ bandwidth),
> (max_antenna_gain, max_eirp), (dfs_cac_time)
> [ 17.850000] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A,
> 3000 mBm), (N/A)
> [ 17.860000] cfg80211: (5170000 KHz - 5250000 KHz @ 80000 KHz, 160000
> KHz AUTO), (N/A, 1700 mBm), (N/A)
> [ 17.870000] cfg80211: (5250000 KHz - 5330000 KHz @ 80000 KHz, 160000
> KHz AUTO), (N/A, 2300 mBm), (0 s)
> [ 17.880000] cfg80211: (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A,
> 3000 mBm), (N/A)
> [ 17.890000] cfg80211: (57240000 KHz - 63720000 KHz @ 2160000 KHz),
> (N/A, 4000 mBm), (N/A)
> [ 18.250000] random: nonblocking pool is initialized
> [ 33.130000] device eth0 entered promiscuous mode
> [ 33.130000] IPv6: ADDRCONF(NETDEV_UP): br-lan: link is not ready
> [ 33.190000] device eth1 entered promiscuous mode
> [ 33.190000] br-lan: port 2(eth1) entered forwarding state
> [ 33.200000] br-lan: port 2(eth1) entered forwarding state
> [ 33.200000] IPv6: ADDRCONF(NETDEV_CHANGE): br-lan: link becomes ready
> [ 34.170000] br-lan: port 2(eth1) entered disabled state
> [ 34.770000] eth0: link up (1000Mbps/Full duplex)
> [ 34.770000] br-lan: port 1(eth0) entered forwarding state
> [ 34.780000] br-lan: port 1(eth0) entered forwarding state
> [ 35.730000] eth1: link up (100Mbps/Full duplex)
> [ 35.730000] br-lan: port 2(eth1) entered forwarding state
> [ 35.740000] br-lan: port 2(eth1) entered forwarding state
> [ 35.960000] svc: failed to register lockdv1 RPC service (errno 124).
> [ 36.780000] br-lan: port 1(eth0) entered forwarding state
> [ 37.740000] br-lan: port 2(eth1) entered forwarding state
> [ 265.110000] ------------[ cut here ]------------
> [ 265.110000] WARNING: CPU: 0 PID: 831 at fs/btrfs/super.c:260
> __btrfs_abort_transaction+0x74/0x150 [btrfs]()
> [ 265.120000] BTRFS: Transaction aborted (error -17)
> [ 265.130000] Modules linked in: ath9k ath9k_common pppoe ppp_async
> iptable_nat ath9k_hw ath pppox ppp_generic nf_nat_ipv4
> nf_conntrack_ipv6 nf_conntrack_ipv4 mac80211 ipt_REJECT ipt_MASQUERADE
> cfg80211 xt_time xt_tcpudp xt_state xt_nat xt_multiport xt_mark xt_mac
> xt_limit xt_id xt_conntrack xt_comment xt_TCPMSS xt_REDIRECT xt_LOG
> xt_CT slhc nf_reject_ipv4 nf_nat_masquerade_ipv4 nf_nat_irc nf_nat_ftp
> nf_nat nf_log_ipv4 nf_defrag_ipv6 nf_defrag_ipv4 nf_conntrack_rtcache
> nf_conntrack_irc nf_conntrack_ftp nf_conntrack libcrc32c iptable_raw
> iptable_mangle iptable_filter ip_tables crc_ccitt compat
> ledtrig_usbdev ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 nf_log_common
> ip6table_raw ip6table_mangle ip6table_filter ip6_tables x_tables nfsd
> nfsv3 nfs lockd sunrpc grace dns_resolver ipv6 arc4 crypto_blkcipher
> usb_storage sd_mod scsi_mod ext4 crc16 jbd2 mbcache btrfs zlib_inflate
> zlib_deflate xor raid6_pq lzo_decompress lzo_compress exportfs
> crc32c_generic crypto_hash ohci_platform ohci_hcd ehci_platform
> ehci_hcd gpio_button_hotplug usbcore nls_base usb_common
> [ 265.220000] CPU: 0 PID: 831 Comm: btrfs-transacti Not tainted 3.18.9 #1
> [ 265.230000] Stack : 00000000 00000000 00000000 00000000 803fe10a
> 0000003b 00000000 832012e0
> [ 265.230000] 00000001 8359fed8 8033fd38 8038df63 0000033f 803f3b80
> 83a195a8 8359fed8
> [ 265.230000] 832b6dfc 00000000 832c0000 802cf89c 00000003 8022ae14
> 00000104 8359fed8
> [ 265.230000] 80342e54 825bdc6c 00000000 00000000 00000000 00000000
> 00000000 00000000
> [ 265.230000] 00000000 00000000 00000000 00000000 00000000 00000000
> 00000000 00000000
> [ 265.230000] ...
> [ 265.260000] Call Trace:
> [ 265.270000] [<802718d8>] show_stack+0x48/0x70
> [ 265.270000] [<802e0c48>] warn_slowpath_common+0x84/0xb4
> [ 265.280000] [<802e0ca4>] warn_slowpath_fmt+0x2c/0x38
> [ 265.280000] [<832012e0>] __btrfs_abort_transaction+0x74/0x150 [btrfs]
> [ 265.290000] [<832206e4>] btrfs_run_delayed_refs+0xa0/0x318 [btrfs]
> [ 265.290000] [<83220bb8>] btrfs_write_dirty_block_groups+0x25c/0x650 [btrfs]
> [ 265.300000] [<832b3df4>] btrfs_crc32c+0x514/0x1418 [btrfs]
> [ 265.310000]
> [ 265.310000] ---[ end trace e1e1a04204a7499b ]---
> [ 265.310000] BTRFS: error (device sda1) in
> btrfs_run_delayed_refs:2792: errno=-17 Object already exists
> [ 265.320000] BTRFS info (device sda1): forced readonly
> [ 265.350000] BTRFS warning (device sda1): Skipping commit of aborted
> transaction.
> [ 265.360000] BTRFS: error (device sda1) in cleanup_transaction:1607:
> errno=-17 Object already exists
>
> # cat /proc/meminfo
> MemTotal: 61020 kB
> MemFree: 2784 kB
> MemAvailable: 40044 kB
> Buffers: 1736 kB
> Cached: 35768 kB
> SwapCached: 0 kB
> Active: 20292 kB
> Inactive: 19244 kB
> Active(anon): 2952 kB
> Inactive(anon): 32 kB
> Active(file): 17340 kB
> Inactive(file): 19212 kB
> Unevictable: 0 kB
> Mlocked: 0 kB
> SwapTotal: 0 kB
> SwapFree: 0 kB
> Dirty: 0 kB
> Writeback: 0 kB
> AnonPages: 2064 kB
> Mapped: 1428 kB
> Shmem: 920 kB
> Slab: 11460 kB
> SReclaimable: 4392 kB
> SUnreclaim: 7068 kB
> KernelStack: 592 kB
> PageTables: 284 kB
> NFS_Unstable: 0 kB
> Bounce: 0 kB
> WritebackTmp: 0 kB
> CommitLimit: 30508 kB
> Committed_AS: 5848 kB
> VmallocTotal: 1048372 kB
> VmallocUsed: 1612 kB
> VmallocChunk: 1026496 kB
> --
> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>
Hi everyone,

Is there any more information I can provide or do to help track down 
what is causing this problem?

I am more than happy to perform tests, provide logs etc. I can build my 
own OpenWrt images and apply patches (probably, I'd have to learn how 
first). I might even be able to investigate myself with a pointer or 2 
of where to start looking.

Thank you :-)
Sophie x

Re: WARNING at fs/btrfs/super.c:260 __btrfs_abort_transaction (error -17)

[Chris Mason]

On Tue, Mar 24, 2015 at 9:43 AM, Sophie Dexter 
<Just4pLeisure@gmail.com> wrote:
> On 20/03/2015 15:19, Sophie Dexter wrote:
>> I'm given to understand that this is the right place to report a 
>> btrfs
>> problem, I apologise if not :-(
>> 
>> I have been using my router as a simple NFS NAS for around 2 years
>> with an ext3 formatted 2 TB Western Digital 2.5" USB Passport disk. I
>> have been slowly moving to BTRFS and thought it about time to convert
>> this disk too but unfortunately BTRFS is unreliable on my router :-(.
>> It doesn't take long for an error to happen causing a 'ro' remount.
>> However the disk is unreadable after the remount, both for NFS and
>> locally. Rebooting the router seems to be the only way to access the
>> disk again.
>> 
>> I also have a 1 GB swap partition on the disk although swap doesn't
>> appear to be a factor as the problem occurs whether or not swap is
>> enabled (this report is without swap).
>> 
>> I used my laptop to convert the fs to btrfs, not my router. My laptop
>> has Fedora 21 with 3.18 kernel and tools. No problems are found when 
>> I
>> use my laptop to check and scrub the disk (i.e. with the disk
>> connected directly to my laptop).

You have great timing, there are two reports of a very similar abort 
with 4.0-rc5, but your report makes it clear these are not a regression 
from 4.0-rc4.

Are you able to run btrfsck on this filesystem?  I'd like to check for 
metadata inconsistencies.

-chris

Re: WARNING at fs/btrfs/super.c:260 __btrfs_abort_transaction (error -17)

[Sophie]

On 24/03/15 17:34, Chris Mason wrote:
>
>
> On Tue, Mar 24, 2015 at 9:43 AM, Sophie Dexter <Just4pLeisure@gmail.com>
> wrote:
>> On 20/03/2015 15:19, Sophie Dexter wrote:
>>> I'm given to understand that this is the right place to report a btrfs
>>> problem, I apologise if not :-(
>>>
>>> I have been using my router as a simple NFS NAS for around 2 years
>>> with an ext3 formatted 2 TB Western Digital 2.5" USB Passport disk. I
>>> have been slowly moving to BTRFS and thought it about time to convert
>>> this disk too but unfortunately BTRFS is unreliable on my router :-(.
>>> It doesn't take long for an error to happen causing a 'ro' remount.
>>> However the disk is unreadable after the remount, both for NFS and
>>> locally. Rebooting the router seems to be the only way to access the
>>> disk again.
>>>
>>> I also have a 1 GB swap partition on the disk although swap doesn't
>>> appear to be a factor as the problem occurs whether or not swap is
>>> enabled (this report is without swap).
>>>
>>> I used my laptop to convert the fs to btrfs, not my router. My laptop
>>> has Fedora 21 with 3.18 kernel and tools. No problems are found when I
>>> use my laptop to check and scrub the disk (i.e. with the disk
>>> connected directly to my laptop).
>
> You have great timing, there are two reports of a very similar abort
> with 4.0-rc5, but your report makes it clear these are not a regression
> from 4.0-rc4.
>
> Are you able to run btrfsck on this filesystem?  I'd like to check for
> metadata inconsistencies.
>
> -chris
>
Hi Chris,

Haha, great timing is the secret of good comedy lol

OpenWrt has only very recently signed off the 3.18 kernel as the default 
kernel for my router, I was using a build with 3.14 when I converted my 
disk and saw the same problem :!: I may have posted something I haven't 
repeated here in the OpenWrt ticket I opened:

https://dev.openwrt.org/ticket/19216

I previously checked and scrubbed the disk when the problem first 
occurred and happily no problems were found then. Although, I had to use 
another computer because btrfs check doesn't complete on my router, the 
process is killed due to lack of memory (btrfs invoked oom-killer) :-( 
Should I start another topic for this or just accept that that problem 
is due to a lack of memory?

I have just run btrfs check again using (yet another) laptop and I think 
everything is still OK:

# btrfs check /dev/sdb1
Checking filesystem on /dev/sdb1
UUID: ########-####-####-####-############
checking extents
checking free space cache
checking fs roots
checking csums
checking root refs
found 930516788539 bytes used err is 0
total csum bytes: 1234353920
total tree bytes: 1458515968
total fs tree bytes: 54571008
total extent tree bytes: 66936832
btree space waste bytes: 73372568
file data blocks allocated: 1264250781696
  referenced 1264250781696
Btrfs v3.14.1
# uname -a
Linux ######-########-#### 3.16.0-31-generic #43-Ubuntu SMP Tue Mar 10 
17:37:36 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Kind regards,
Sophie x

Re: WARNING at fs/btrfs/super.c:260 __btrfs_abort_transaction (error -17)

[Sophie Dexter]

> On 24/03/15 17:34, Chris Mason wrote:
>> You have great timing, there are two reports of a very similar abort
>> with 4.0-rc5, but your report makes it clear these are not a regression
>> from 4.0-rc4.
>>
>> Are you able to run btrfsck on this filesystem?  I'd like to check for
>> metadata inconsistencies.
>>
>> -chris
>>
> Hi Chris,
>
> Haha, great timing is the secret of good comedy lol
>
> OpenWrt has only very recently signed off the 3.18 kernel as the default
> kernel for my router, I was using a build with 3.14 when I converted my
> disk and saw the same problem :!: I may have posted something I haven't
> repeated here in the OpenWrt ticket I opened:
>
> https://dev.openwrt.org/ticket/19216
>
> I previously checked and scrubbed the disk when the problem first
> occurred and happily no problems were found then. Although, I had to use
> another computer because btrfs check doesn't complete on my router, the
> process is killed due to lack of memory (btrfs invoked oom-killer) :-(
> Should I start another topic for this or just accept that that problem
> is due to a lack of memory?
>
> I have just run btrfs check again using (yet another) laptop and I think
> everything is still OK:
>
> # btrfs check /dev/sdb1
> Checking filesystem on /dev/sdb1
> UUID: ########-####-####-####-############
> checking extents
> checking free space cache
> checking fs roots
> checking csums
> checking root refs
> found 930516788539 bytes used err is 0
> total csum bytes: 1234353920
> total tree bytes: 1458515968
> total fs tree bytes: 54571008
> total extent tree bytes: 66936832
> btree space waste bytes: 73372568
> file data blocks allocated: 1264250781696
>   referenced 1264250781696
> Btrfs v3.14.1
> # uname -a
> Linux ######-########-#### 3.16.0-31-generic #43-Ubuntu SMP Tue Mar 10
> 17:37:36 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
>
> Kind regards,
> Sophie x
>
>
I want to continue to use BTRFS as far as possible and have moved this 
disk to a Raspberry Pi now because of the problems I encountered with it 
when it was plugged into my router. I'd rather do this than convert back 
to ext3/4. I'm using Open Media Vault on my Paspberry Pi and, fingers 
crossed, haven't had any problems over the weekend.

I can only guess, given it's inability to complete a btrfs check, that a 
router doesn't have enough memory for BTRFS. I'm happy to move my disk 
back to my router to try things out and help develop BTRFS for small 
computers, but for now at least it has a new home.

Sophie x

Re: WARNING at fs/btrfs/super.c:260 __btrfs_abort_transaction (error -17)

[Chris Mason]

On Mon, Mar 30, 2015 at 10:05 AM, Sophie Dexter 
<Just4pLeisure@gmail.com> wrote:
>> On 24/03/15 17:34, Chris Mason wrote:
>>> You have great timing, there are two reports of a very similar abort
>>> with 4.0-rc5, but your report makes it clear these are not a 
>>> regression
>>> from 4.0-rc4.
>>> 
>>> Are you able to run btrfsck on this filesystem?  I'd like to check 
>>> for
>>> metadata inconsistencies.
>>> 
>>> -chris
>>> 
>> Hi Chris,
>> 
>> Haha, great timing is the secret of good comedy lol
>> 
>> OpenWrt has only very recently signed off the 3.18 kernel as the 
>> default
>> kernel for my router, I was using a build with 3.14 when I converted 
>> my
>> disk and saw the same problem :!: I may have posted something I 
>> haven't
>> repeated here in the OpenWrt ticket I opened:
>> 
>> https://dev.openwrt.org/ticket/19216
>> 
>> I previously checked and scrubbed the disk when the problem first
>> occurred and happily no problems were found then. Although, I had to 
>> use
>> another computer because btrfs check doesn't complete on my router, 
>> the
>> process is killed due to lack of memory (btrfs invoked oom-killer) 
>> :-(
>> Should I start another topic for this or just accept that that 
>> problem
>> is due to a lack of memory?
>> 
>> I have just run btrfs check again using (yet another) laptop and I 
>> think
>> everything is still OK:
>> 
>> # btrfs check /dev/sdb1
>> Checking filesystem on /dev/sdb1
>> UUID: ########-####-####-####-############
>> checking extents
>> checking free space cache
>> checking fs roots
>> checking csums
>> checking root refs
>> found 930516788539 bytes used err is 0
>> total csum bytes: 1234353920
>> total tree bytes: 1458515968
>> total fs tree bytes: 54571008
>> total extent tree bytes: 66936832
>> btree space waste bytes: 73372568
>> file data blocks allocated: 1264250781696
>>   referenced 1264250781696
>> Btrfs v3.14.1
>> # uname -a
>> Linux ######-########-#### 3.16.0-31-generic #43-Ubuntu SMP Tue Mar 
>> 10
>> 17:37:36 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
>> 
>> Kind regards,
>> Sophie x
>> 
>> 
> I want to continue to use BTRFS as far as possible and have moved 
> this disk to a Raspberry Pi now because of the problems I encountered 
> with it when it was plugged into my router. I'd rather do this than 
> convert back to ext3/4. I'm using Open Media Vault on my Paspberry Pi 
> and, fingers crossed, haven't had any problems over the weekend.
> 
> I can only guess, given it's inability to complete a btrfs check, 
> that a router doesn't have enough memory for BTRFS. I'm happy to move 
> my disk back to my router to try things out and help develop BTRFS 
> for small computers, but for now at least it has a new home.

I have an image that can reproduce this bug, and I'm trying to figure 
out where we've gone wrong.  Hopefully end of day tomorrow I'll have 
more ideas, but its a run time error related to extent management.  
Since the FS check is clean, the FS itself isn't corrupt.

-chris

Re: WARNING at fs/btrfs/super.c:260 __btrfs_abort_transaction (error -17)

[Sophie Dexter]

On 30/03/2015 22:21, Chris Mason wrote:
>
>
> On Mon, Mar 30, 2015 at 10:05 AM, Sophie Dexter
> <Just4pLeisure@gmail.com> wrote:
>>> On 24/03/15 17:34, Chris Mason wrote:
>>>> You have great timing, there are two reports of a very similar abort
>>>> with 4.0-rc5, but your report makes it clear these are not a regression
>>>> from 4.0-rc4.
>>>>
>>>> Are you able to run btrfsck on this filesystem?  I'd like to check for
>>>> metadata inconsistencies.
>>>>
>>>> -chris
>>>>
>>> Hi Chris,
>>>
>>> Haha, great timing is the secret of good comedy lol
>>>
>>> OpenWrt has only very recently signed off the 3.18 kernel as the default
>>> kernel for my router, I was using a build with 3.14 when I converted my
>>> disk and saw the same problem :!: I may have posted something I haven't
>>> repeated here in the OpenWrt ticket I opened:
>>>
>>> https://dev.openwrt.org/ticket/19216
>>>
>>> I previously checked and scrubbed the disk when the problem first
>>> occurred and happily no problems were found then. Although, I had to use
>>> another computer because btrfs check doesn't complete on my router, the
>>> process is killed due to lack of memory (btrfs invoked oom-killer) :-(
>>> Should I start another topic for this or just accept that that problem
>>> is due to a lack of memory?
>>>
>>> I have just run btrfs check again using (yet another) laptop and I think
>>> everything is still OK:
>>>
>>> # btrfs check /dev/sdb1
>>> Checking filesystem on /dev/sdb1
>>> UUID: ########-####-####-####-############
>>> checking extents
>>> checking free space cache
>>> checking fs roots
>>> checking csums
>>> checking root refs
>>> found 930516788539 bytes used err is 0
>>> total csum bytes: 1234353920
>>> total tree bytes: 1458515968
>>> total fs tree bytes: 54571008
>>> total extent tree bytes: 66936832
>>> btree space waste bytes: 73372568
>>> file data blocks allocated: 1264250781696
>>>   referenced 1264250781696
>>> Btrfs v3.14.1
>>> # uname -a
>>> Linux ######-########-#### 3.16.0-31-generic #43-Ubuntu SMP Tue Mar 10
>>> 17:37:36 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
>>>
>>> Kind regards,
>>> Sophie x
>>>
>>>
>> I want to continue to use BTRFS as far as possible and have moved this
>> disk to a Raspberry Pi now because of the problems I encountered with
>> it when it was plugged into my router. I'd rather do this than convert
>> back to ext3/4. I'm using Open Media Vault on my Paspberry Pi and,
>> fingers crossed, haven't had any problems over the weekend.
>>
>> I can only guess, given it's inability to complete a btrfs check, that
>> a router doesn't have enough memory for BTRFS. I'm happy to move my
>> disk back to my router to try things out and help develop BTRFS for
>> small computers, but for now at least it has a new home.
>
> I have an image that can reproduce this bug, and I'm trying to figure
> out where we've gone wrong.  Hopefully end of day tomorrow I'll have
> more ideas, but its a run time error related to extent management. Since
> the FS check is clean, the FS itself isn't corrupt.
>
> -chris
>
Hi Chris,

That sounds promising. I'll try my disk on my router again when you have 
something you want to test on a wider audience.

Sophie x

Re: WARNING at fs/btrfs/super.c:260 __btrfs_abort_transaction (error -17)

[Chris Mason]

On Tue, Mar 24, 2015 at 6:23 PM, Sophie <just4pleisure@gmail.com> wrote:
> On 24/03/15 17:34, Chris Mason wrote:
>> 
>> 
>> On Tue, Mar 24, 2015 at 9:43 AM, Sophie Dexter 
>> <Just4pLeisure@gmail.com>
>> wrote:
>>> On 20/03/2015 15:19, Sophie Dexter wrote:
>>>> I'm given to understand that this is the right place to report a 
>>>> btrfs
>>>> problem, I apologise if not :-(
>>>> 
>>>> I have been using my router as a simple NFS NAS for around 2 years
>>>> with an ext3 formatted 2 TB Western Digital 2.5" USB Passport 
>>>> disk. I
>>>> have been slowly moving to BTRFS and thought it about time to 
>>>> convert
>>>> this disk too but unfortunately BTRFS is unreliable on my router 
>>>> :-(.
>>>> It doesn't take long for an error to happen causing a 'ro' remount.
>>>> However the disk is unreadable after the remount, both for NFS and
>>>> locally. Rebooting the router seems to be the only way to access 
>>>> the
>>>> disk again.
>>>> 
>>>> I also have a 1 GB swap partition on the disk although swap doesn't
>>>> appear to be a factor as the problem occurs whether or not swap is
>>>> enabled (this report is without swap).
>>>> 
>>>> I used my laptop to convert the fs to btrfs, not my router. My 
>>>> laptop
>>>> has Fedora 21 with 3.18 kernel and tools. No problems are found 
>>>> when I
>>>> use my laptop to check and scrub the disk (i.e. with the disk
>>>> connected directly to my laptop).
>> 
>> You have great timing, there are two reports of a very similar abort
>> with 4.0-rc5, but your report makes it clear these are not a 
>> regression
>> from 4.0-rc4.
>> 
>> Are you able to run btrfsck on this filesystem?  I'd like to check 
>> for
>> metadata inconsistencies.
>> 
>> -chris
>> 
> Hi Chris,
> 
> Haha, great timing is the secret of good comedy lol
> 
> OpenWrt has only very recently signed off the 3.18 kernel as the 
> default kernel for my router, I was using a build with 3.14 when I 
> converted my disk and saw the same problem :!: I may have posted 
> something I haven't repeated here in the OpenWrt ticket I opened:
> 
> https://dev.openwrt.org/ticket/19216
> 
> I previously checked and scrubbed the disk when the problem first 
> occurred and happily no problems were found then. Although, I had to 
> use another computer because btrfs check doesn't complete on my 
> router, the process is killed due to lack of memory (btrfs invoked 
> oom-killer) :-( Should I start another topic for this or just accept 
> that that problem is due to a lack of memory?
> 
> I have just run btrfs check again using (yet another) laptop and I 
> think everything is still OK:
> 
> # btrfs check /dev/sdb1
> Checking filesystem on /dev/sdb1
> UUID: ########-####-####-####-############
> checking extents
> checking free space cache
> checking fs roots
> checking csums
> checking root refs
> found 930516788539 bytes used err is 0
> total csum bytes: 1234353920
> total tree bytes: 1458515968
> total fs tree bytes: 54571008
> total extent tree bytes: 66936832
> btree space waste bytes: 73372568
> file data blocks allocated: 1264250781696
>  referenced 1264250781696
> Btrfs v3.14.1
> # uname -a
> Linux ######-########-#### 3.16.0-31-generic #43-Ubuntu SMP Tue Mar 
> 10 17:37:36 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Sophie, can you please grab the latest btrfs progs from git:

git://git.kernel.org/pub/scm/linux/kernel/git/kdave/btrfs-progs.git

And try with that btrfsck?

The other image that is reproducing this has an error in the free space 
cache, so I'd like to confirm if you're hitting the same problem.

-chris

Re: WARNING at fs/btrfs/super.c:260 __btrfs_abort_transaction (error -17)

[Sophie Dexter]

On 01/04/2015 15:13, Chris Mason wrote:
>
>
> On Tue, Mar 24, 2015 at 6:23 PM, Sophie <just4pleisure@gmail.com> wrote:
>> On 24/03/15 17:34, Chris Mason wrote:
>>>
>>>
>>> On Tue, Mar 24, 2015 at 9:43 AM, Sophie Dexter <Just4pLeisure@gmail.com>
>>> wrote:
>>>> On 20/03/2015 15:19, Sophie Dexter wrote:
>>>>> I'm given to understand that this is the right place to report a btrfs
>>>>> problem, I apologise if not :-(
>>>>>
>>>>> I have been using my router as a simple NFS NAS for around 2 years
>>>>> with an ext3 formatted 2 TB Western Digital 2.5" USB Passport disk. I
>>>>> have been slowly moving to BTRFS and thought it about time to convert
>>>>> this disk too but unfortunately BTRFS is unreliable on my router :-(.
>>>>> It doesn't take long for an error to happen causing a 'ro' remount.
>>>>> However the disk is unreadable after the remount, both for NFS and
>>>>> locally. Rebooting the router seems to be the only way to access the
>>>>> disk again.
>>>>>
>>>>> I also have a 1 GB swap partition on the disk although swap doesn't
>>>>> appear to be a factor as the problem occurs whether or not swap is
>>>>> enabled (this report is without swap).
>>>>>
>>>>> I used my laptop to convert the fs to btrfs, not my router. My laptop
>>>>> has Fedora 21 with 3.18 kernel and tools. No problems are found when I
>>>>> use my laptop to check and scrub the disk (i.e. with the disk
>>>>> connected directly to my laptop).
>>>
>>> You have great timing, there are two reports of a very similar abort
>>> with 4.0-rc5, but your report makes it clear these are not a regression
>>> from 4.0-rc4.
>>>
>>> Are you able to run btrfsck on this filesystem?  I'd like to check for
>>> metadata inconsistencies.
>>>
>>> -chris
>>>
>> Hi Chris,
>>
>> Haha, great timing is the secret of good comedy lol
>>
>> OpenWrt has only very recently signed off the 3.18 kernel as the
>> default kernel for my router, I was using a build with 3.14 when I
>> converted my disk and saw the same problem :!: I may have posted
>> something I haven't repeated here in the OpenWrt ticket I opened:
>>
>> https://dev.openwrt.org/ticket/19216
>>
>> I previously checked and scrubbed the disk when the problem first
>> occurred and happily no problems were found then. Although, I had to
>> use another computer because btrfs check doesn't complete on my
>> router, the process is killed due to lack of memory (btrfs invoked
>> oom-killer) :-( Should I start another topic for this or just accept
>> that that problem is due to a lack of memory?
>>
>> I have just run btrfs check again using (yet another) laptop and I
>> think everything is still OK:
>>
>> # btrfs check /dev/sdb1
>> Checking filesystem on /dev/sdb1
>> UUID: ########-####-####-####-############
>> checking extents
>> checking free space cache
>> checking fs roots
>> checking csums
>> checking root refs
>> found 930516788539 bytes used err is 0
>> total csum bytes: 1234353920
>> total tree bytes: 1458515968
>> total fs tree bytes: 54571008
>> total extent tree bytes: 66936832
>> btree space waste bytes: 73372568
>> file data blocks allocated: 1264250781696
>>  referenced 1264250781696
>> Btrfs v3.14.1
>> # uname -a
>> Linux ######-########-#### 3.16.0-31-generic #43-Ubuntu SMP Tue Mar 10
>> 17:37:36 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
>
> Sophie, can you please grab the latest btrfs progs from git:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/kdave/btrfs-progs.git
>
> And try with that btrfsck?
>
> The other image that is reproducing this has an error in the free space
> cache, so I'd like to confirm if you're hitting the same problem.
>
> -chris
>
Hi Chris,

I compiled the tools on my Fedora laptop this lunchtime (and noticed a 
few omissions on the btrfs wiki source repositories page so have 
requested a wiki account so that I can update that page). I don't have 
the problematic disk with me at the moment but will btrfsck it again 
when I get home.

Is it helpful to test my disk with different systems? I could build the 
latest tools on my Ubuntu laptop and I see that OpenWRT updated to 
3.19.1 btrfs progs a few days ago too. I will try them on my router 
anyway to see if btrfsck now completes or if the oom-killer steps in still.

I don't know what version of tools are on my Raspbian Raspberry Pi but 
if they're not the new ones I could try to (cross?) compile those to, 
but tthat might take me a little while as I haven't compiled anything 
for my Raspberry Pi before.

Happy Easter :-)
Sophie x

Re: WARNING at fs/btrfs/super.c:260 __btrfs_abort_transaction (error -17)

[Sophie Dexter]

On 02/04/15 13:38, Sophie Dexter wrote:
> On 01/04/2015 15:13, Chris Mason wrote:
>>
>>
>> On Tue, Mar 24, 2015 at 6:23 PM, Sophie <just4pleisure@gmail.com> wrote:
>>> On 24/03/15 17:34, Chris Mason wrote:
>>>>
>>>>
>>>> On Tue, Mar 24, 2015 at 9:43 AM, Sophie Dexter
>>>> <Just4pLeisure@gmail.com>
>>>> wrote:
>>>>> On 20/03/2015 15:19, Sophie Dexter wrote:
>>>>>> I'm given to understand that this is the right place to report a
>>>>>> btrfs
>>>>>> problem, I apologise if not :-(
>>>>>>
>>>>>> I have been using my router as a simple NFS NAS for around 2 years
>>>>>> with an ext3 formatted 2 TB Western Digital 2.5" USB Passport disk. I
>>>>>> have been slowly moving to BTRFS and thought it about time to convert
>>>>>> this disk too but unfortunately BTRFS is unreliable on my router :-(.
>>>>>> It doesn't take long for an error to happen causing a 'ro' remount.
>>>>>> However the disk is unreadable after the remount, both for NFS and
>>>>>> locally. Rebooting the router seems to be the only way to access the
>>>>>> disk again.
>>>>>>
>>>>>> I also have a 1 GB swap partition on the disk although swap doesn't
>>>>>> appear to be a factor as the problem occurs whether or not swap is
>>>>>> enabled (this report is without swap).
>>>>>>
>>>>>> I used my laptop to convert the fs to btrfs, not my router. My laptop
>>>>>> has Fedora 21 with 3.18 kernel and tools. No problems are found
>>>>>> when I
>>>>>> use my laptop to check and scrub the disk (i.e. with the disk
>>>>>> connected directly to my laptop).
>>>>
>>>> You have great timing, there are two reports of a very similar abort
>>>> with 4.0-rc5, but your report makes it clear these are not a regression
>>>> from 4.0-rc4.
>>>>
>>>> Are you able to run btrfsck on this filesystem?  I'd like to check for
>>>> metadata inconsistencies.
>>>>
>>>> -chris
>>>>
>>> Hi Chris,
>>>
>>> Haha, great timing is the secret of good comedy lol
>>>
>>> OpenWrt has only very recently signed off the 3.18 kernel as the
>>> default kernel for my router, I was using a build with 3.14 when I
>>> converted my disk and saw the same problem :!: I may have posted
>>> something I haven't repeated here in the OpenWrt ticket I opened:
>>>
>>> https://dev.openwrt.org/ticket/19216
>>>
>>> I previously checked and scrubbed the disk when the problem first
>>> occurred and happily no problems were found then. Although, I had to
>>> use another computer because btrfs check doesn't complete on my
>>> router, the process is killed due to lack of memory (btrfs invoked
>>> oom-killer) :-( Should I start another topic for this or just accept
>>> that that problem is due to a lack of memory?
>>>
>>> I have just run btrfs check again using (yet another) laptop and I
>>> think everything is still OK:
>>>
>>> # btrfs check /dev/sdb1
>>> Checking filesystem on /dev/sdb1
>>> UUID: ########-####-####-####-############
>>> checking extents
>>> checking free space cache
>>> checking fs roots
>>> checking csums
>>> checking root refs
>>> found 930516788539 bytes used err is 0
>>> total csum bytes: 1234353920
>>> total tree bytes: 1458515968
>>> total fs tree bytes: 54571008
>>> total extent tree bytes: 66936832
>>> btree space waste bytes: 73372568
>>> file data blocks allocated: 1264250781696
>>>  referenced 1264250781696
>>> Btrfs v3.14.1
>>> # uname -a
>>> Linux ######-########-#### 3.16.0-31-generic #43-Ubuntu SMP Tue Mar 10
>>> 17:37:36 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
>>
>> Sophie, can you please grab the latest btrfs progs from git:
>>
>> git://git.kernel.org/pub/scm/linux/kernel/git/kdave/btrfs-progs.git
>>
>> And try with that btrfsck?
>>
>> The other image that is reproducing this has an error in the free space
>> cache, so I'd like to confirm if you're hitting the same problem.
>>
>> -chris
>>
> Hi Chris,
>
> I compiled the tools on my Fedora laptop this lunchtime (and noticed a
> few omissions on the btrfs wiki source repositories page so have
> requested a wiki account so that I can update that page). I don't have
> the problematic disk with me at the moment but will btrfsck it again
> when I get home.
>
> Is it helpful to test my disk with different systems? I could build the
> latest tools on my Ubuntu laptop and I see that OpenWRT updated to
> 3.19.1 btrfs progs a few days ago too. I will try them on my router
> anyway to see if btrfsck now completes or if the oom-killer steps in still.
>
> I don't know what version of tools are on my Raspbian Raspberry Pi but
> if they're not the new ones I could try to (cross?) compile those to,
> but tthat might take me a little while as I haven't compiled anything
> for my Raspberry Pi before.
>
> Happy Easter :-)
> Sophie x
>
Hi Chris,

I first tested my disk on my Kubuntu laptop with the btrfs-progs that I 
built from git and everything looked good

Next I tested on my router using btrfs-progs from OpenWrt nightly 
builds. My first attempt to run btrfsck failed because of lack of memory 
(oom-killer) so I mounted a 1GiB swap partition and tried again. This 
time btrfsck got further but appeared to find a problem with the free 
space cache - eek :-(

BUT, I retested on my Kubuntu laptop and then my Fedora laptop and there 
are no errors ?!?

Finally I ran btrfsck using my Raspberry Pi 2 and again no problems 
detected although the version of btrfs-tools on my Raspberry Pi, v0.19, 
appears rather unusual to me.

So, whilst the problem, as indicated on my router at least, may be 
related to the free space cache, it doesn't appear to be entirely real. 
The only other observation I made is that btrfsck on my RPi indicates a 
different number of found bytes used.

Hopefully you can infer something from my findings,
Sophie x

My 1st test, using my Kubuntu laptop:

$ uname -a
Linux ######-########-#### 3.16.0-31-generic #43-Ubuntu SMP Tue Mar 10 
17:37:36 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

$ ./btrfs --version
btrfs-progs v3.19.1

$ sudo ./btrfsck /dev/sdb1
Checking filesystem on /dev/sdb1
UUID: ########-####-####-####-############
checking extents
checking free space cache
checking fs roots
checking csums
checking root refs
found 1265436922895 bytes used err is 0
total csum bytes: 1234353920
total tree bytes: 1458507776
total fs tree bytes: 54571008
total extent tree bytes: 66928640
btree space waste bytes: 73338086
file data blocks allocated: 1264250781696
  referenced 1264250781696
btrfs-progs v3.19.1

2nd test, using my router:

# uname -a
Linux ######### 3.18.9 #1 Thu Mar 19 18:35:47 UTC 2015 mips GNU/Linux

# btrfs --version
btrfs-progs v3.19.1

# btrfsck /dev/sda1
Warning, could not drop caches
Warning, could not drop caches
Checking filesystem on /dev/sda1
UUID: ########-####-####-####-############
checking extents
checking free space cache
btrfs: unable to add free space :-17
btrfsck: free-space-cache.c: 806: btrfs_add_free_space: Assertion `!(ret 
== -17)' failed.
Aborted

3rd test, using my Fedora laptop

# uname -a
Linux #####-######.########.### 3.19.1-201.fc21.x86_64 #1 SMP Wed Mar 18 
04:29:24 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

# ./btrfs --version
btrfs-progs v3.19.1

# ./btrfsck /dev/sdb1
Checking filesystem on /dev/sdb1
UUID: ########-####-####-####-############
checking extents
checking free space cache
checking fs roots
checking csums
checking root refs
found 1265436922895 bytes used err is 0
total csum bytes: 1234353920
total tree bytes: 1458507776
total fs tree bytes: 54571008
total extent tree bytes: 66928640
btree space waste bytes: 73338086
file data blocks allocated: 1264250781696
  referenced 1264250781696
btrfs-progs v3.19.1

4th test, using my Raspberry Pi 2:

$ uname -a
Linux raspberrypi 3.18.10-v7+ #774 SMP PREEMPT Wed Mar 25 14:10:30 GMT 
2015 armv7l GNU/Linux

$ btrfs --version
Btrfs Btrfs v0.19

$ sudo btrfsck /dev/sda1
checking extents
checking fs roots
checking root refs
found 1265709289472 bytes used err is 0
total csum bytes: 1234353920
total tree bytes: 1458507776
total fs tree bytes: 54571008
btree space waste bytes: 73338086
file data blocks allocated: 1264250781696
  referenced 1264250781696
Btrfs Btrfs v0.19