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From: Sandeepa Prabhu <sandeepa.prabhu@linaro.org>
To: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Will Deacon <will.deacon@arm.com>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"patches@linaro.org" <patches@linaro.org>,
	"linaro-kernel@lists.linaro.org" <linaro-kernel@lists.linaro.org>,
	Catalin Marinas <Catalin.Marinas@arm.com>,
	"steve.capper@linaro.org" <steve.capper@linaro.org>,
	"nico@linaro.org" <nico@linaro.org>,
	"srikar@linux.vnet.ibm.com" <srikar@linux.vnet.ibm.com>,
	"rostedt@goodmis.org" <rostedt@goodmis.org>,
	"dsaxena@linaro.org" <dsaxena@linaro.org>,
	"Vijaya.Kumar@caviumnetworks.com"
	<Vijaya.Kumar@caviumnetworks.com>, Jiang Liu <liuj97@gmail.com>,
	"yrl.pp-manager.tt@hitachi.com" <yrl.pp-manager.tt@hitachi.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Ingo Molnar <mingo@redhat.com>
Subject: Re: Re: Re: [PATCH RFC 2/6] arm64: Kprobes with single stepping support
Date: Wed, 13 Nov 2013 12:38:13 +0530	[thread overview]
Message-ID: <CA+b37P1R8g9V61j4==tfZxQUm1Zym6ssJUAKKHLKXOgTsMa3wQ@mail.gmail.com> (raw)
In-Reply-To: <CA+b37P1sNsEXrJFfVL51sZ-SeGNCBiwXnOwCiFY8CBwSXPw+mQ@mail.gmail.com>

[-- Attachment #1: Type: text/plain, Size: 1894 bytes --]

On 13 November 2013 12:25, Sandeepa Prabhu <sandeepa.prabhu@linaro.org> wrote:
>>>> I'm unsure about arm64's debug feature behavior, what does happen when
>>>> it performs a single-step on sw-breakpoint?
>>>>
>>>>> Sandeepa: I think you need to retry Masami's test on the arm64 model, since
>>>>> I'm fairly sure it won't work as expected without some additional code.
>>>>
>>>> OK, anyway, for testing same one, we need to port ftrace first. So the next
>>
>> Sorry for confusion, s/next/fallback is what I meant. Making a kprobe module
>> can be done without ftrace port.
>>
>>>> plan is to make a kprobe module to put a probe (which just printk something)
>>>> on a specific function (e.g. vfs_symlink), and run perf record with
>>>> hw-breakpoint as below
>>>>
>>>> $ perf record -e "mem:0xXXXXXX:k" ln -s /dev/null /tmp/foo
>>>>
>>>> Note that 0xXXXXXX is the address of vfs_symlink.
>>>>
>>>> After that, you can see the message in dmesg and also check the perf result
>>>> with "sudo perf script --dump" (you can find a PERF_RECORD_SAMPLE entry if
>>>> it works)
Hi Will, Masami,

I am not sure of 'perf' right now (my minimal rootfs doesn't have) but
I tried to test hardware breakpoints using sample modules
"samples/hw_breakpoint/" on arm64 upstream branch. This should use
same kernel api as perf I believe.

1.  Placing watchpoint ( attr.bp_type = HW_BREAKPOINT_W |
HW_BREAKPOINT_R) upon vfs_symlink symbol, but seems watch-point is not
triggering at all.
2.  Placing text breakpoint (modified sample module with attr.bp_type
= HW_BREAKPOINT_X) upon vfs_symlink, and run "ln -s /dev/null
/tmp/foo".  This time, breakpoint hit but exception is re-cursing
infinitely!

I have attached the kernel logs for reference. So wanted to check if
hw breakpoint/watch-points are working on the upstream branch? Has it
been tested recently with sample modules  or perf/ptrace?

Thanks,
Sandeepa

[-- Attachment #2: kernel_aarch64_20131113-120837.log --]
[-- Type: text/x-log, Size: 31635 bytes --]

Initializing cgroup subsys cpu
Linux version 3.12.0-rc4+ (sandeepa@linaro-workstation) (gcc version 4.7.3 20130328 (prerelease) (crosstool-NG linaro-1.13.1-4.7-2013.04-20130415 - Linaro GCC 2013.04) ) #24 SMP PREEMPT Wed Nov 13 12:04:03 IST 2013
CPU: AArch64 Processor [410fd0f0] revision 0
Machine: RTSM_VE_AEMv8A
bootconsole [earlycon0] enabled
PERCPU: Embedded 10 pages/cpu @ffffffc87ffa8000 s11776 r8192 d20992 u40960
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 1034240
Kernel command line: console=ttyAMA0 root=/dev/mmcblk0p2 earlyprintk=pl011,0x1c090000 consolelog=9 rw
PID hash table entries: 4096 (order: 3, 32768 bytes)
Dentry cache hash table entries: 524288 (order: 10, 4194304 bytes)
Inode-cache hash table entries: 262144 (order: 9, 2097152 bytes)
software IO TLB [mem 0x8f8000000-0x8fc000000] (64MB) mapped at [ffffffc878000000-ffffffc87bffffff]
Memory: 4058384K/4194304K available (3347K kernel code, 211K rwdata, 1164K rodata, 171K init, 154K bss, 135920K reserved)
Virtual kernel memory layout:
    vmalloc : 0xffffff8000000000 - 0xffffffbbffff0000   (245759 MB)
    vmemmap : 0xffffffbc01c00000 - 0xffffffbc1f800000   (   476 MB)
    modules : 0xffffffbffc000000 - 0xffffffc000000000   (    64 MB)
    memory  : 0xffffffc000000000 - 0xffffffc880000000   ( 34816 MB)
      .init : 0xffffffc0004e9000 - 0xffffffc000513e00   (   172 kB)
      .text : 0xffffffc000080000 - 0xffffffc0004e8cf4   (  4516 kB)
      .data : 0xffffffc000514000 - 0xffffffc000548e80   (   212 kB)
SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
Preemptible hierarchical RCU implementation.
	RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=4.
NR_IRQS:64 nr_irqs:64 0
Architected cp15 timer(s) running at 100.00MHz (phys).
Console: colour dummy device 80x25
Calibrating delay loop (skipped), value calculated using timer frequency.. 200.00 BogoMIPS (lpj=1000000)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 256
hw perfevents: enabled with arm/armv8-pmuv3 PMU driver, 9 counters available
CPU1: Booted secondary processor
CPU2: Booted secondary processor
CPU3: Booted secondary processor
Brought up 4 CPUs
SMP: Total of 4 processors activated.
devtmpfs: initialized
atomic64 test passed
NET: Registered protocol family 16
of_amba_device_create(): amba_device_add() failed (-19) for /smb/motherboard/iofpga@3,00000000/sysctl@020000
vdso: 2 pages (1 code, 1 data) at base ffffffc000519000
hw-breakpoint: found 16 breakpoint and 16 watchpoint registers.
Serial: AMBA PL011 UART driver
1c090000.uart: ttyAMA0 at MMIO 0x1c090000 (irq = 37, base_baud = 0) is a PL011 rev2
console [ttyAMA0] enabled, bootconsole disabled
console [ttyAMA0] enabled, bootconsole disabled
1c0a0000.uart: ttyAMA1 at MMIO 0x1c0a0000 (irq = 38, base_baud = 0) is a PL011 rev2
1c0b0000.uart: ttyAMA2 at MMIO 0x1c0b0000 (irq = 39, base_baud = 0) is a PL011 rev2
1c0c0000.uart: ttyAMA3 at MMIO 0x1c0c0000 (irq = 40, base_baud = 0) is a PL011 rev2
bio: create slab <bio-0> at 0
SCSI subsystem initialized
Switched to clocksource arch_sys_counter
NET: Registered protocol family 2
TCP established hash table entries: 32768 (order: 7, 524288 bytes)
TCP bind hash table entries: 32768 (order: 7, 524288 bytes)
TCP: Hash tables configured (established 32768 bind 32768)
TCP: reno registered
UDP hash table entries: 2048 (order: 4, 65536 bytes)
UDP-Lite hash table entries: 2048 (order: 4, 65536 bytes)
NET: Registered protocol family 1
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
Unpacking initramfs...
Freeing initrd memory: 936K (ffffffc010000000 - ffffffc0100ea000)
fuse init (API version 7.22)
msgmni has been set to 7928
io scheduler noop registered
io scheduler cfq registered (default)
Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
smc91x: not found (-19).
mousedev: PS/2 mouse device common for all mice
TCP: cubic registered
NET: Registered protocol family 17
<NUL>Freeing unused kernel memory: 168K (ffffffc0004e9000 - ffffffc000513000)
Wed Nov 18 01:00:00 UTC 2009
sh: can't access tty; job control turned off
/ # 
/ # 
/ # 
/ # 
/ # insm\r/ # insmod ^[[Jkp\a\b^[[J\b^[[Jda\a\r/ # insmod data^[[J_\r/ # insmod data_breakpoint.ko ^[[Jf\b^[[Jksym=vfs_symlink
HW Breakpoint for vfs_symlink write installed
/ # 
/ # 
/ # 
/ # ln -=s \b^[[J\b^[[J\b^[[Js /de\a\r/ # ln -s /de^[[Jv\r/ # ln -s /dev/^[[Jnull /tmp/a
/ # \r/ # ln -s /dev/null /tmp/a^[[J\b^[[Jn\b^[[Jb
/ # ls /tm\r/ # ls /tmp/^[[J
^[[1;36ma^[[0m    ^[[1;36mb^[[0m    ^[[1;34mlog^[[0m
/ # 
/ # 
/ # 
/ # \r/ # ls /tmp/^[[J -al
total 0
drwxrwxrwt    3 0        0              100 Nov 18 01:00 ^[[1;34m.^[[0m
drwxrwxr-x   12 1000     1000             0 Nov 18 01:00 ^[[1;34m..^[[0m
lrwxrwxrwx    1 0        0                9 Nov 18 01:00 ^[[1;36ma^[[0m -> ^[[1;35m/dev/null^[[0m
lrwxrwxrwx    1 0        0                9 Nov 18 01:00 ^[[1;36mb^[[0m -> ^[[1;35m/dev/null^[[0m
drwxrwxrwx    2 0        0               40 Nov 18 01:00 ^[[1;34mlog^[[0m
/ # dmesg
Initializing cgroup subsys cpu
Linux version 3.12.0-rc4+ (sandeepa@linaro-workstation) (gcc version 4.7.3 20130328 (prerelease) (crosstool-NG linaro-1.13.1-4.7-2013.04-20130415 - Linaro GCC 2013.04) ) #24 SMP PREEMPT Wed Nov 13 12:04:03 IST 2013
CPU: AArch64 Processor [410fd0f0] revision 0
Machine: RTSM_VE_AEMv8A
bootconsole [earlycon0] enabled
On node 0 totalpages: 1048576
  DMA32 zone: 7168 pages used for memmap
  DMA32 zone: 0 pages reserved
  DMA32 zone: 524288 pages, LIFO batch:31
  Normal zone: 7168 pages used for memmap
  Normal zone: 524288 pages, LIFO batch:31
PERCPU: Embedded 10 pages/cpu @ffffffc87ffa8000 s11776 r8192 d20992 u40960
pcpu-alloc: s11776 r8192 d20992 u40960 alloc=10*4096
pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3 
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 1034240
Kernel command line: console=ttyAMA0 root=/dev/mmcblk0p2 earlyprintk=pl011,0x1c090000 consolelog=9 rw
PID hash table entries: 4096 (order: 3, 32768 bytes)
Dentry cache hash table entries: 524288 (order: 10, 4194304 bytes)
Inode-cache hash table entries: 262144 (order: 9, 2097152 bytes)
software IO TLB [mem 0x8f8000000-0x8fc000000] (64MB) mapped at [ffffffc878000000-ffffffc87bffffff]
Memory: 4058384K/4194304K available (3347K kernel code, 211K rwdata, 1164K rodata, 171K init, 154K bss, 135920K reserved)
Virtual kernel memory layout:
    vmalloc : 0xffffff8000000000 - 0xffffffbbffff0000   (245759 MB)
    vmemmap : 0xffffffbc01c00000 - 0xffffffbc1f800000   (   476 MB)
    modules : 0xffffffbffc000000 - 0xffffffc000000000   (    64 MB)
    memory  : 0xffffffc000000000 - 0xffffffc880000000   ( 34816 MB)
      .init : 0xffffffc0004e9000 - 0xffffffc000513e00   (   172 kB)
      .text : 0xffffffc000080000 - 0xffffffc0004e8cf4   (  4516 kB)
      .data : 0xffffffc000514000 - 0xffffffc000548e80   (   212 kB)
SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
Preemptible hierarchical RCU implementation.
	RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=4.
NR_IRQS:64 nr_irqs:64 0
Architected cp15 timer(s) running at 100.00MHz (phys).
Console: colour dummy device 80x25
Calibrating delay loop (skipped), value calculated using timer frequency.. 200.00 BogoMIPS (lpj=1000000)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 256
hw perfevents: enabled with arm/armv8-pmuv3 PMU driver, 9 counters available
CPU1: Booted secondary processor
CPU2: Booted secondary processor
CPU3: Booted secondary processor
Brought up 4 CPUs
SMP: Total of 4 processors activated.
devtmpfs: initialized
atomic64 test passed
NET: Registered protocol family 16
of_amba_device_create(): amba_device_add() failed (-19) for /smb/motherboard/iofpga@3,00000000/sysctl@020000
vdso: 2 pages (1 code, 1 data) at base ffffffc000519000
hw-breakpoint: found 16 breakpoint and 16 watchpoint registers.
Serial: AMBA PL011 UART driver
1c090000.uart: ttyAMA0 at MMIO 0x1c090000 (irq = 37, base_baud = 0) is a PL011 rev2
console [ttyAMA0] enabled, bootconsole disabled
1c0a0000.uart: ttyAMA1 at MMIO 0x1c0a0000 (irq = 38, base_baud = 0) is a PL011 rev2
1c0b0000.uart: ttyAMA2 at MMIO 0x1c0b0000 (irq = 39, base_baud = 0) is a PL011 rev2
1c0c0000.uart: ttyAMA3 at MMIO 0x1c0c0000 (irq = 40, base_baud = 0) is a PL011 rev2
bio: create slab <bio-0> at 0
SCSI subsystem initialized
Switched to clocksource arch_sys_counter
NET: Registered protocol family 2
TCP established hash table entries: 32768 (order: 7, 524288 bytes)
TCP bind hash table entries: 32768 (order: 7, 524288 bytes)
TCP: Hash tables configured (established 32768 bind 32768)
TCP: reno registered
UDP hash table entries: 2048 (order: 4, 65536 bytes)
UDP-Lite hash table entries: 2048 (order: 4, 65536 bytes)
NET: Registered protocol family 1
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
Unpacking initramfs...
Freeing initrd memory: 936K (ffffffc010000000 - ffffffc0100ea000)
fuse init (API version 7.22)
msgmni has been set to 7928
io scheduler noop registered
io scheduler cfq registered (default)
Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
smc91x: not found (-19).
mousedev: PS/2 mouse device common for all mice
TCP: cubic registered
NET: Registered protocol family 17
Freeing unused kernel memory: 168K (ffffffc0004e9000 - ffffffc000513000)
HW Breakpoint for vfs_symlink write installed
/ # 
/ # 
/ # 
/ # rmm\r/ # rmmod ^[[Jda\a\r/ # rmmod data^[[J_\r/ # rmmod data_breakpoint.ko ^[[J
HW Breakpoint for vfs_symlink write uninstalled
/ # 
/ # 
/ # 
/ # 
/ # insm\r/ # insmod ^[[Jte\r/ # insmod text_breakpoint.ko ^[[Jksym=bfs\b^[[J\b^[[J\b^[[Jvfs_symlink
HW Breakpoint for vfs_symlink write installed
/ # 
/ # 
/ # 
/ # 
/ # 
/ # 
/ # 
/ # \r/ # insmod text_breakpoint.ko ksym=vfs_symlink^[[J\r/ # rmmod data_breakpoint.ko ^[[J\r/ # dmesg^[[J\r/ # ls /tmp/ -al^[[J\r/ # ls /tmp/^[[J\r/ # ln -s /dev/null /tmp/b^[[J\r/ # ln -s /dev/null /tmp/a^[[J\b^[[Jc
vfs_symlink value is changed
CPU: 2 PID: 463 Comm: ln Not tainted 3.12.0-rc4+ #24
Call trace:
[<ffffffc00008718c>] dump_backtrace+0x0/0x12c
[<ffffffc0000872cc>] show_stack+0x14/0x1c
[<ffffffc0003b88e4>] dump_stack+0x70/0xac
[<ffffffbffc004020>] $x+0x20/0x34 [text_breakpoint]
[<ffffffc0000f8d40>] __perf_event_overflow+0xa4/0x214
[<ffffffc0000f9604>] perf_swevent_overflow+0x50/0x84
[<ffffffc0000f96f4>] perf_swevent_event+0xbc/0xc0
[<ffffffc0000f9938>] perf_bp_event+0x6c/0x78
[<ffffffc00008fd90>] breakpoint_handler+0xec/0x1d8
[<ffffffc0000811ec>] do_debug_exception+0x40/0xac
Exception stack(0xffffffc07fd27cb0 to 0xffffffc07fd27dd0)
7ca0:                                     7784ec00 ffffffc8 7fd44000 ffffffc0
7cc0: 7fd27e70 ffffffc0 0013f9d8 ffffffc0 7fd27ce0 ffffffc0 00148400 ffffffc0
7ce0: 7fd27d00 ffffffc0 00159670 ffffffc0 7784ec00 ffffffc8 7f81f180 ffffffc0
7d00: 7fd27d20 ffffffc0 0013e010 ffffffc0 7784ec00 ffffffc8 00000000 00000000
7d20: 7fd27d40 ffffffc0 0013ec5c ffffffc0 00000600 00000000 7f81f180 ffffffc0
7d40: 7fd27d70 ffffffc0 0013ec88 ffffffc0 77784048 ffffffc8 7784ec00 ffffffc8
7d60: 7fd44020 ffffffc0 000003ea 00000000 7f81f180 ffffffc0 00556e58 ffffffc0
7d80: 7fd42000 ffffffc0 7fd42000 ffffffc0 00000000 00000000 ffb0c278 00000000
7da0: 00000001 00000000 00000000 00000000 00000000 00000000 ffb0c268 00000000
7dc0: 0007ee24 00000000 00000000 00000000
[<ffffffc0000834ac>] el1_dbg+0x10/0x60
[<ffffffc000143dc4>] SyS_symlink+0x14/0x1c
Dump stack from sample_hbp_handler
vfs_symlink value is changed
CPU: 2 PID: 463 Comm: ln Not tainted 3.12.0-rc4+ #24
Call trace:
[<ffffffc00008718c>] dump_backtrace+0x0/0x12c
[<ffffffc0000872cc>] show_stack+0x14/0x1c
[<ffffffc0003b88e4>] dump_stack+0x70/0xac
[<ffffffbffc004020>] $x+0x20/0x34 [text_breakpoint]
[<ffffffc0000f8d40>] __perf_event_overflow+0xa4/0x214
[<ffffffc0000f9604>] perf_swevent_overflow+0x50/0x84
[<ffffffc0000f96f4>] perf_swevent_event+0xbc/0xc0
[<ffffffc0000f9938>] perf_bp_event+0x6c/0x78
[<ffffffc00008fd90>] breakpoint_handler+0xec/0x1d8
[<ffffffc0000811ec>] do_debug_exception+0x40/0xac
Exception stack(0xffffffc07fd27cb0 to 0xffffffc07fd27dd0)
7ca0:                                     7784ec00 ffffffc8 7fd44000 ffffffc0
7cc0: 7fd27e70 ffffffc0 0013f9d8 ffffffc0 7fd27ce0 ffffffc0 00148400 ffffffc0
7ce0: 7fd27d00 ffffffc0 00159670 ffffffc0 7784ec00 ffffffc8 7f81f180 ffffffc0
7d00: 7fd27d20 ffffffc0 0013e010 ffffffc0 7784ec00 ffffffc8 00000000 00000000
7d20: 7fd27d40 ffffffc0 0013ec5c ffffffc0 00000600 00000000 7f81f180 ffffffc0
7d40: 7fd27d70 ffffffc0 0013ec88 ffffffc0 77784048 ffffffc8 7784ec00 ffffffc8
7d60: 7fd44020 ffffffc0 000003ea 00000000 7f81f180 ffffffc0 00556e58 ffffffc0
7d80: 7fd42000 ffffffc0 7fd42000 ffffffc0 00000000 00000000 ffb0c278 00000000
7da0: 00000001 00000000 00000000 00000000 00000000 00000000 ffb0c268 00000000
7dc0: 0007ee24 00000000 00000000 00000000
[<ffffffc0000834ac>] el1_dbg+0x10/0x60
[<ffffffc000143dc4>] SyS_symlink+0x14/0x1c
Dump stack from sample_hbp_handler
vfs_symlink value is changed
CPU: 2 PID: 463 Comm: ln Not tainted 3.12.0-rc4+ #24
Call trace:
[<ffffffc00008718c>] dump_backtrace+0x0/0x12c
[<ffffffc0000872cc>] show_stack+0x14/0x1c
[<ffffffc0003b88e4>] dump_stack+0x70/0xac
[<ffffffbffc004020>] $x+0x20/0x34 [text_breakpoint]
[<ffffffc0000f8d40>] __perf_event_overflow+0xa4/0x214
[<ffffffc0000f9604>] perf_swevent_overflow+0x50/0x84
[<ffffffc0000f96f4>] perf_swevent_event+0xbc/0xc0
[<ffffffc0000f9938>] perf_bp_event+0x6c/0x78
[<ffffffc00008fd90>] breakpoint_handler+0xec/0x1d8
[<ffffffc0000811ec>] do_debug_exception+0x40/0xac
Exception stack(0xffffffc07fd27cb0 to 0xffffffc07fd27dd0)
7ca0:                                     7784ec00 ffffffc8 7fd44000 ffffffc0
7cc0: 7fd27e70 ffffffc0 0013f9d8 ffffffc0 7fd27ce0 ffffffc0 00148400 ffffffc0
7ce0: 7fd27d00 ffffffc0 00159670 ffffffc0 7784ec00 ffffffc8 7f81f180 ffffffc0
7d00: 7fd27d20 ffffffc0 0013e010 ffffffc0 7784ec00 ffffffc8 00000000 00000000
7d20: 7fd27d40 ffffffc0 0013ec5c ffffffc0 00000600 00000000 7f81f180 ffffffc0
7d40: 7fd27d70 ffffffc0 0013ec88 ffffffc0 77784048 ffffffc8 7784ec00 ffffffc8
7d60: 7fd44020 ffffffc0 000003ea 00000000 7f81f180 ffffffc0 00556e58 ffffffc0
7d80: 7fd42000 ffffffc0 7fd42000 ffffffc0 00000000 00000000 ffb0c278 00000000
7da0: 00000001 00000000 00000000 00000000 00000000 00000000 ffb0c268 00000000
7dc0: 0007ee24 00000000 00000000 00000000
[<ffffffc0000834ac>] el1_dbg+0x10/0x60
[<ffffffc000143dc4>] SyS_symlink+0x14/0x1c
Dump stack from sample_hbp_handler
vfs_symlink value is changed
CPU: 2 PID: 463 Comm: ln Not tainted 3.12.0-rc4+ #24
Call trace:
[<ffffffc00008718c>] dump_backtrace+0x0/0x12c
[<ffffffc0000872cc>] show_stack+0x14/0x1c
[<ffffffc0003b88e4>] dump_stack+0x70/0xac
[<ffffffbffc004020>] $x+0x20/0x34 [text_breakpoint]
[<ffffffc0000f8d40>] __perf_event_overflow+0xa4/0x214
[<ffffffc0000f9604>] perf_swevent_overflow+0x50/0x84
[<ffffffc0000f96f4>] perf_swevent_event+0xbc/0xc0
[<ffffffc0000f9938>] perf_bp_event+0x6c/0x78
[<ffffffc00008fd90>] breakpoint_handler+0xec/0x1d8
[<ffffffc0000811ec>] do_debug_exception+0x40/0xac
Exception stack(0xffffffc07fd27cb0 to 0xffffffc07fd27dd0)
7ca0:                                     7784ec00 ffffffc8 7fd44000 ffffffc0
7cc0: 7fd27e70 ffffffc0 0013f9d8 ffffffc0 7fd27ce0 ffffffc0 00148400 ffffffc0
7ce0: 7fd27d00 ffffffc0 00159670 ffffffc0 7784ec00 ffffffc8 7f81f180 ffffffc0
7d00: 7fd27d20 ffffffc0 0013e010 ffffffc0 7784ec00 ffffffc8 00000000 00000000
7d20: 7fd27d40 ffffffc0 0013ec5c ffffffc0 00000600 00000000 7f81f180 ffffffc0
7d40: 7fd27d70 ffffffc0 0013ec88 ffffffc0 77784048 ffffffc8 7784ec00 ffffffc8
7d60: 7fd44020 ffffffc0 000003ea 00000000 7f81f180 ffffffc0 00556e58 ffffffc0
7d80: 7fd42000 ffffffc0 7fd42000 ffffffc0 00000000 00000000 ffb0c278 00000000
7da0: 00000001 00000000 00000000 00000000 00000000 00000000 ffb0c268 00000000
7dc0: 0007ee24 00000000 00000000 00000000
[<ffffffc0000834ac>] el1_dbg+0x10/0x60
[<ffffffc000143dc4>] SyS_symlink+0x14/0x1c
Dump stack from sample_hbp_handler
vfs_symlink value is changed
CPU: 2 PID: 463 Comm: ln Not tainted 3.12.0-rc4+ #24
Call trace:
[<ffffffc00008718c>] dump_backtrace+0x0/0x12c
[<ffffffc0000872cc>] show_stack+0x14/0x1c
[<ffffffc0003b88e4>] dump_stack+0x70/0xac
[<ffffffbffc004020>] $x+0x20/0x34 [text_breakpoint]
[<ffffffc0000f8d40>] __perf_event_overflow+0xa4/0x214
[<ffffffc0000f9604>] perf_swevent_overflow+0x50/0x84
[<ffffffc0000f96f4>] perf_swevent_event+0xbc/0xc0
[<ffffffc0000f9938>] perf_bp_event+0x6c/0x78
[<ffffffc00008fd90>] breakpoint_handler+0xec/0x1d8
[<ffffffc0000811ec>] do_debug_exception+0x40/0xac
Exception stack(0xffffffc07fd27cb0 to 0xffffffc07fd27dd0)
7ca0:                                     7784ec00 ffffffc8 7fd44000 ffffffc0
7cc0: 7fd27e70 ffffffc0 0013f9d8 ffffffc0 00512000 ffffffc0 00148400 ffffffc0
7ce0: 7fd27d20 ffffffc0 00081294 ffffffc0 0000200c ffffff80 7fd27d50 ffffffc0
7d00: 00548d84 ffffffc0 00491788 ffffffc0 005132c0 ffffffc0 003bbaa0 ffffffc0
7d20: 7fd27d30 ffffffc0 003bbaac ffffffc0 7fd27e70 ffffffc0 00083630 ffffffc0
7d40: 7784ec00 ffffffc8 0013f9d8 ffffffc0 77784048 ffffffc8 7784ec00 ffffffc8
7d60: 7fd44020 ffffffc0 000003ea 00000000 7f81f180 ffffffc0 00556e58 ffffffc0
7d80: 7fd42000 ffffffc0 7fd42000 ffffffc0 00000000 00000000 ffb0c278 00000000
7da0: 00000001 00000000 00000000 00000000 00000000 00000000 ffb0c268 00000000
7dc0: 0007ee24 00000000 00000000 00000000
[<ffffffc0000834ac>] el1_dbg+0x10/0x60
[<ffffffc000143dc4>] SyS_symlink+0x14/0x1c
Dump stack from sample_hbp_handler
vfs_symlink value is changed
CPU: 2 PID: 463 Comm: ln Not tainted 3.12.0-rc4+ #24
Call trace:
[<ffffffc00008718c>] dump_backtrace+0x0/0x12c
[<ffffffc0000872cc>] show_stack+0x14/0x1c
[<ffffffc0003b88e4>] dump_stack+0x70/0xac
[<ffffffbffc004020>] $x+0x20/0x34 [text_breakpoint]
[<ffffffc0000f8d40>] __perf_event_overflow+0xa4/0x214
[<ffffffc0000f9604>] perf_swevent_overflow+0x50/0x84
[<ffffffc0000f96f4>] perf_swevent_event+0xbc/0xc0
[<ffffffc0000f9938>] perf_bp_event+0x6c/0x78
[<ffffffc00008fd90>] breakpoint_handler+0xec/0x1d8
[<ffffffc0000811ec>] do_debug_exception+0x40/0xac
Exception stack(0xffffffc07fd27cb0 to 0xffffffc07fd27dd0)
7ca0:                                     7784ec00 ffffffc8 7fd44000 ffffffc0
7cc0: 7fd27e70 ffffffc0 0013f9d8 ffffffc0 00512000 ffffffc0 00148400 ffffffc0
7ce0: 7fd27d20 ffffffc0 00081294 ffffffc0 0000200c ffffff80 7fd27d50 ffffffc0
7d00: 00548d84 ffffffc0 00491788 ffffffc0 005132c0 ffffffc0 003bbaa0 ffffffc0
7d20: 7fd27d30 ffffffc0 003bbaac ffffffc0 7fd27e70 ffffffc0 00083630 ffffffc0
7d40: 7784ec00 ffffffc8 0013f9d8 ffffffc0 77784048 ffffffc8 7784ec00 ffffffc8
7d60: 7fd44020 ffffffc0 000003ea 00000000 7f81f180 ffffffc0 00556e58 ffffffc0
7d80: 7fd42000 ffffffc0 7fd42000 ffffffc0 00000000 00000000 ffb0c278 00000000
7da0: 00000001 00000000 00000000 00000000 00000000 00000000 ffb0c268 00000000
7dc0: 0007ee24 00000000 00000000 00000000
[<ffffffc0000834ac>] el1_dbg+0x10/0x60
[<ffffffc000143dc4>] SyS_symlink+0x14/0x1c
Dump stack from sample_hbp_handler
vfs_symlink value is changed
CPU: 2 PID: 463 Comm: ln Not tainted 3.12.0-rc4+ #24
Call trace:
[<ffffffc00008718c>] dump_backtrace+0x0/0x12c
[<ffffffc0000872cc>] show_stack+0x14/0x1c
[<ffffffc0003b88e4>] dump_stack+0x70/0xac
[<ffffffbffc004020>] $x+0x20/0x34 [text_breakpoint]
[<ffffffc0000f8d40>] __perf_event_overflow+0xa4/0x214
[<ffffffc0000f9604>] perf_swevent_overflow+0x50/0x84
[<ffffffc0000f96f4>] perf_swevent_event+0xbc/0xc0
[<ffffffc0000f9938>] perf_bp_event+0x6c/0x78
[<ffffffc00008fd90>] breakpoint_handler+0xec/0x1d8
[<ffffffc0000811ec>] do_debug_exception+0x40/0xac
Exception stack(0xffffffc07fd27cb0 to 0xffffffc07fd27dd0)
7ca0:                                     7784ec00 ffffffc8 7fd44000 ffffffc0
7cc0: 7fd27e70 ffffffc0 0013f9d8 ffffffc0 00512000 ffffffc0 00148400 ffffffc0
7ce0: 7fd27d20 ffffffc0 00081294 ffffffc0 0000200c ffffff80 7fd27d50 ffffffc0
7d00: 00548d84 ffffffc0 00491788 ffffffc0 005132c0 ffffffc0 003bbaa0 ffffffc0
7d20: 7fd27d30 ffffffc0 003bbaac ffffffc0 7fd27e70 ffffffc0 00083630 ffffffc0
7d40: 7784ec00 ffffffc8 0013f9d8 ffffffc0 77784048 ffffffc8 7784ec00 ffffffc8
7d60: 7fd44020 ffffffc0 000003ea 00000000 7f81f180 ffffffc0 00556e58 ffffffc0
7d80: 7fd42000 ffffffc0 7fd42000 ffffffc0 00000000 00000000 ffb0c278 00000000
7da0: 00000001 00000000 00000000 00000000 00000000 00000000 ffb0c268 00000000
7dc0: 0007ee24 00000000 00000000 00000000
[<ffffffc0000834ac>] el1_dbg+0x10/0x60
[<ffffffc000143dc4>] SyS_symlink+0x14/0x1c
Dump stack from sample_hbp_handler
vfs_symlink value is changed
CPU: 2 PID: 463 Comm: ln Not tainted 3.12.0-rc4+ #24
Call trace:
[<ffffffc00008718c>] dump_backtrace+0x0/0x12c
[<ffffffc0000872cc>] show_stack+0x14/0x1c
[<ffffffc0003b88e4>] dump_stack+0x70/0xac
[<ffffffbffc004020>] $x+0x20/0x34 [text_breakpoint]
[<ffffffc0000f8d40>] __perf_event_overflow+0xa4/0x214
[<ffffffc0000f9604>] perf_swevent_overflow+0x50/0x84
[<ffffffc0000f96f4>] perf_swevent_event+0xbc/0xc0
[<ffffffc0000f9938>] perf_bp_event+0x6c/0x78
[<ffffffc00008fd90>] breakpoint_handler+0xec/0x1d8
[<ffffffc0000811ec>] do_debug_exception+0x40/0xac
Exception stack(0xffffffc07fd27cb0 to 0xffffffc07fd27dd0)
7ca0:                                     7784ec00 ffffffc8 7fd44000 ffffffc0
7cc0: 7fd27e70 ffffffc0 0013f9d8 ffffffc0 00512000 ffffffc0 00148400 ffffffc0
7ce0: 7fd27d20 ffffffc0 00081294 ffffffc0 0000200c ffffff80 7fd27d50 ffffffc0
7d00: 00548d84 ffffffc0 00491788 ffffffc0 005132c0 ffffffc0 003bbaa0 ffffffc0
7d20: 7fd27d30 ffffffc0 003bbaac ffffffc0 7fd27e70 ffffffc0 00083630 ffffffc0
7d40: 7784ec00 ffffffc8 0013f9d8 ffffffc0 77784048 ffffffc8 7784ec00 ffffffc8
7d60: 7fd44020 ffffffc0 000003ea 00000000 7f81f180 ffffffc0 00556e58 ffffffc0
7d80: 7fd42000 ffffffc0 7fd42000 ffffffc0 00000000 00000000 ffb0c278 00000000
7da0: 00000001 00000000 00000000 00000000 00000000 00000000 ffb0c268 00000000
7dc0: 0007ee24 00000000 00000000 00000000
[<ffffffc0000834ac>] el1_dbg+0x10/0x60
[<ffffffc000143dc4>] SyS_symlink+0x14/0x1c
Dump stack from sample_hbp_handler
vfs_symlink value is changed
CPU: 2 PID: 463 Comm: ln Not tainted 3.12.0-rc4+ #24
Call trace:
[<ffffffc00008718c>] dump_backtrace+0x0/0x12c
[<ffffffc0000872cc>] show_stack+0x14/0x1c
[<ffffffc0003b88e4>] dump_stack+0x70/0xac
[<ffffffbffc004020>] $x+0x20/0x34 [text_breakpoint]
[<ffffffc0000f8d40>] __perf_event_overflow+0xa4/0x214
[<ffffffc0000f9604>] perf_swevent_overflow+0x50/0x84
[<ffffffc0000f96f4>] perf_swevent_event+0xbc/0xc0
[<ffffffc0000f9938>] perf_bp_event+0x6c/0x78
[<ffffffc00008fd90>] breakpoint_handler+0xec/0x1d8
[<ffffffc0000811ec>] do_debug_exception+0x40/0xac
Exception stack(0xffffffc07fd27cb0 to 0xffffffc07fd27dd0)
7ca0:                                     7784ec00 ffffffc8 7fd44000 ffffffc0
7cc0: 7fd27e70 ffffffc0 0013f9d8 ffffffc0 00512000 ffffffc0 00148400 ffffffc0
7ce0: 7fd27d20 ffffffc0 00081294 ffffffc0 0000200c ffffff80 7fd27d50 ffffffc0
7d00: 00548d84 ffffffc0 00491788 ffffffc0 005132c0 ffffffc0 003bbaa0 ffffffc0
7d20: 7fd27d30 ffffffc0 003bbaac ffffffc0 7fd27e70 ffffffc0 00083630 ffffffc0
7d40: 7784ec00 ffffffc8 0013f9d8 ffffffc0 77784048 ffffffc8 7784ec00 ffffffc8
7d60: 7fd44020 ffffffc0 000003ea 00000000 7f81f180 ffffffc0 00556e58 ffffffc0
7d80: 7fd42000 ffffffc0 7fd42000 ffffffc0 00000000 00000000 ffb0c278 00000000
7da0: 00000001 00000000 00000000 00000000 00000000 00000000 ffb0c268 00000000
7dc0: 0007ee24 00000000 00000000 00000000
[<ffffffc0000834ac>] el1_dbg+0x10/0x60
[<ffffffc000143dc4>] SyS_symlink+0x14/0x1c
Dump stack from sample_hbp_handler
vfs_symlink value is changed
CPU: 2 PID: 463 Comm: ln Not tainted 3.12.0-rc4+ #24
Call trace:
[<ffffffc00008718c>] dump_backtrace+0x0/0x12c
[<ffffffc0000872cc>] show_stack+0x14/0x1c
[<ffffffc0003b88e4>] dump_stack+0x70/0xac
[<ffffffbffc004020>] $x+0x20/0x34 [text_breakpoint]
[<ffffffc0000f8d40>] __perf_event_overflow+0xa4/0x214
[<ffffffc0000f9604>] perf_swevent_overflow+0x50/0x84
[<ffffffc0000f96f4>] perf_swevent_event+0xbc/0xc0
[<ffffffc0000f9938>] perf_bp_event+0x6c/0x78
[<ffffffc00008fd90>] breakpoint_handler+0xec/0x1d8
[<ffffffc0000811ec>] do_debug_exception+0x40/0xac
Exception stack(0xffffffc07fd27cb0 to 0xffffffc07fd27dd0)
7ca0:                                     7784ec00 ffffffc8 7fd44000 ffffffc0
7cc0: 7fd27e70 ffffffc0 0013f9d8 ffffffc0 00512000 ffffffc0 00148400 ffffffc0
7ce0: 7fd27d20 ffffffc0 00081294 ffffffc0 0000200c ffffff80 7fd27d50 ffffffc0
7d00: 0055b8c0 ffffffc0 00002010 ffffff80 80000145 00000000 003bbaa0 ffffffc0
7d20: 7fd27e70 ffffffc0 000835c0 ffffffc0 7784ec00 ffffffc8 7fd44000 ffffffc0
7d40: 7fd27e70 ffffffc0 0013f9d8 ffffffc0 77784048 ffffffc8 7784ec00 ffffffc8
7d60: 7fd44020 ffffffc0 000003ea 00000000 7f81f180 ffffffc0 00556e58 ffffffc0
7d80: 7fd42000 ffffffc0 7fd42000 ffffffc0 00000000 00000000 ffb0c278 00000000
7da0: 00000001 00000000 00000000 00000000 00000000 00000000 ffb0c268 00000000
7dc0: 0007ee24 00000000 00000000 00000000
[<ffffffc0000834ac>] el1_dbg+0x10/0x60
[<ffffffc000143dc4>] SyS_symlink+0x14/0x1c
Dump stack from sample_hbp_handler
vfs_symlink value is changed
CPU: 2 PID: 463 Comm: ln Not tainted 3.12.0-rc4+ #24
Call trace:
[<ffffffc00008718c>] dump_backtrace+0x0/0x12c
[<ffffffc0000872cc>] show_stack+0x14/0x1c
[<ffffffc0003b88e4>] dump_stack+0x70/0xac
[<ffffffbffc004020>] $x+0x20/0x34 [text_breakpoint]
[<ffffffc0000f8d40>] __perf_event_overflow+0xa4/0x214
[<ffffffc0000f9604>] perf_swevent_overflow+0x50/0x84
[<ffffffc0000f96f4>] perf_swevent_event+0xbc/0xc0
[<ffffffc0000f9938>] perf_bp_event+0x6c/0x78
[<ffffffc00008fd90>] breakpoint_handler+0xec/0x1d8
[<ffffffc0000811ec>] do_debug_exception+0x40/0xac
Exception stack(0xffffffc07fd27cb0 to 0xffffffc07fd27dd0)
7ca0:                                     7784ec00 ffffffc8 7fd44000 ffffffc0
7cc0: 7fd27e70 ffffffc0 0013f9d8 ffffffc0 00512000 ffffffc0 00148400 ffffffc0
7ce0: 7fd27d20 ffffffc0 00081294 ffffffc0 0000200c ffffff80 7fd27d50 ffffffc0
7d00: 0055b8c0 ffffffc0 00002010 ffffff80 80000145 00000000 003bbaa0 ffffffc0
7d20: 7fd27e70 ffffffc0 000835c0 ffffffc0 7784ec00 ffffffc8 7fd44000 ffffffc0
7d40: 7fd27e70 ffffffc0 0013f9d8 ffffffc0 77784048 ffffffc8 7784ec00 ffffffc8
7d60: 7fd44020 ffffffc0 000003ea 00000000 7f81f180 ffffffc0 00556e58 ffffffc0
7d80: 7fd42000 ffffffc0 7fd42000 ffffffc0 00000000 00000000 ffb0c278 00000000
7da0: 00000001 00000000 00000000 00000000 00000000 00000000 ffb0c268 00000000
7dc0: 0007ee24 00000000 00000000 00000000
[<ffffffc0000834ac>] el1_dbg+0x10/0x60
[<ffffffc000143dc4>] SyS_symlink+0x14/0x1c
Dump stack from sample_hbp_handler
vfs_symlink value is changed
CPU: 2 PID: 463 Comm: ln Not tainted 3.12.0-rc4+ #24
Call trace:
[<ffffffc00008718c>] dump_backtrace+0x0/0x12c
[<ffffffc0000872cc>] show_stack+0x14/0x1c
[<ffffffc0003b88e4>] dump_stack+0x70/0xac
[<ffffffbffc004020>] $x+0x20/0x34 [text_breakpoint]
[<ffffffc0000f8d40>] __perf_event_overflow+0xa4/0x214
[<ffffffc0000f9604>] perf_swevent_overflow+0x50/0x84
[<ffffffc0000f96f4>] perf_swevent_event+0xbc/0xc0
[<ffffffc0000f9938>] perf_bp_event+0x6c/0x78
[<ffffffc00008fd90>] breakpoint_handler+0xec/0x1d8
[<ffffffc0000811ec>] do_debug_exception+0x40/0xac
Exception stack(0xffffffc07fd27cb0 to 0xffffffc07fd27dd0)
7ca0:                                     7784ec00 ffffffc8 7fd44000 ffffffc0
7cc0: 7fd27e70 ffffffc0 0013f9d8 ffffffc0 00512000 ffffffc0 00148400 ffffffc0
7ce0: 7fd27d20 ffffffc0 00081294 ffffffc0 0000200c ffffff80 7fd27d50 ffffffc0
7d00: 0055b8c0 ffffffc0 00002010 ffffff80 80000145 00000000 003bbaa0 ffffffc0
7d20: 7fd27e70 ffffffc0 000835c0 ffffffc0 7784ec00 ffffffc8 7fd44000 ffffffc0
7d40: 7fd27e70 ffffffc0 0013f9d8 ffffffc0 77784048 ffffffc8 7784ec00 ffffffc8
7d60: 7fd44020 ffffffc0 000003ea 00000000 7f81f180 ffffffc0 00556e58 ffffffc0
7d80: 7fd42000 ffffffc0 7fd42000 ffffffc0 00000000 00000000 ffb0c278 00000000
7da0: 00000001 00000000 00000000 00000000 00000000 00000000 ffb0c268 00000000
7dc0: 0007ee24 00000000 00000000 00000000
[<ffffffc0000834ac>] el1_dbg+0x10/0x60
[<ffffffc000143dc4>] SyS_symlink+0x14/0x1c
Dump stack from sample_hbp_handler
vfs_symlink value is changed
CPU: 2 PID: 463 Comm: ln Not tainted 3.12.0-rc4+ #24
Call trace:
[<ffffffc00008718c>] dump_backtrace+0x0/0x12c
[<ffffffc0000872cc>] show_stack+0x14/0x1c
[<ffffffc0003b88e4>] dump_stack+0x70/0xac
[<ffffffbffc004020>] $x+0x20/0x34 [text_breakpoint]
[<ffffffc0000f8d40>] __perf_event_overflow+0xa4/0x214
[<ffffffc0000f9604>] perf_swevent_overflow+0x50/0x84
[<ffffffc0000f96f4>] perf_swevent_event+0xbc/0xc0
[<ffffffc0000f9938>] perf_bp_event+0x6c/0x78
[<ffffffc00008fd90>] breakpoint_handler+0xec/0x1d8
[<ffffffc0000811ec>] do_debug_exception+0x40/0xac
Exception stack(0xffffffc07fd27cb0 to 0xffffffc07fd27dd0)
7ca0:                                     7784ec00 ffffffc8 7fd44000 ffffffc0
7cc0: 7fd27e70 ffffffc0 0013f9d8 ffffffc0 00512000 ffffffc0 00148400 ffffffc0
7ce0: 7fd27d20 ffffffc0 00081294 ffffffc0 0000200c ffffff80 7fd27d50 ffffffc0
7d00: 0055b8c0 ffffffc0 00002010 ffffff80 80000145 00000000 003bbaa0 ffffffc0
7d20: 7fd27e70 ffffffc0 000835c0 ffffffc0 7784ec00 ffffffc8 7fd44000 ffffffc0
7d40: 7fd27e70 ffffffc0 0013f9d8 ffffffc0 77784048 ffffffc8 7784ec00 ffffffc8
7d60: 7fd44020 ffffffc0 000003ea 00000000 7f81f180 ffffffc0 00556e58 ffffffc0
7d80: 7fd42000 ffffffc0 7fd42000 ffffffc0 00000000 00000000 ffb0c278 00000000
7da0: 00000001 00000000 00000000 00000000 00000000 00000000 ffb0c268 00000000
7dc0: 0007ee24 00000000 00000000 00000000
[<ffffffc0000834ac>] el1_dbg+0x10/0x60
[<ffffffc000143dc4>] SyS_symlink+0x14/0x1c
Dump stack from sample_hbp_handler
vfs_symlink value is changed
CPU: 2 PID: 463 Comm: ln Not tainted 3.12.0-rc4+ #24
Call trace:
[<ffffffc00008718c>] dump_backtrace+0x0/0x12c
[<ffffffc0000872cc>] show_stack+0x14/0x1c
[<ffffffc0003b88e4>] dump_stack+0x70/0xac
[<ffffffbffc004020>] $x+0x20/0x34 [text_breakpoint]
[<ffffffc0000f8d40>] __perf_event_overflow+0xa4/0x214
[<ffffffc0000f9604>] perf_swevent_overflow+0x50/0x84
[<ffffffc0000f96f4>] perf_swevent_event+0xbc/0xc0
[<ffffffc0000f9938>] perf_bp_event+0x6c/0x78
[<ffffffc00008fd90>] breakpoint_handler+0xec/0x1d8
[<ffffffc0000811ec>] do_debug_exception+0x40/0xac
Exception stack(0xffffffc07fd27cb0 to 0xffffffc07fd27dd0)
7ca0:                                     7784ec00 ffffffc8 7fd44000 ffffffc0
7cc0: 7fd27e70 ffffffc0 0013f9d8 ffffffc0 00512000 ffffffc0 00148400 ffffffc0
7ce0: 7fd27d20 ffffffc0 00081294 ffffffc0 0000200c ffffff80 7fd27d50 ffffffc0
7d00: 0055b8c0 ffffffc0 00002010 ffffff80 80000145 00000000 003bbaa0 ffffffc0
7d20: 7fd27e70 ffffffc0 000835c0 ffffffc0 7784ec00 ffffffc8 7fd44000 ffffffc0
7d40: 7fd27e70 ffffffc0 0013f9d8 ffffffc0 77784048 ffffffc8 7784ec00 ffffffc8
7d60: 7fd44020 ffffffc0 000003ea 00000000 7f81f180 ffffffc0 00556e58 ffffffc0
7d80: 7fd42000 ffffffc0 7fd42000 ffffffc0 00000000 00000000 ffb0c278 00000000
7da0: 00000001 00000000 00000000 00000000 00000000 00000000 ffb0c268 00000000
7dc0: 0007ee24 00000000 00000000 00000000
[<ffffffc0000834ac>] el1_dbg+0x10/0x60
[<ffffffc000143dc4>] SyS_symlink+0x14/0x1c
Dump stack from sample_hbp_handler
vfs_symlink value is changed
CPU: 2 PID: 463 Comm: ln Not tainted 3.12.0-rc4+ #24

  reply	other threads:[~2013-11-13  7:08 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-10-17 11:17 [PATCH RFC v2 0/6] ARM64: Add kernel probes(Kprobes) support Sandeepa Prabhu
2013-10-17 11:17 ` [PATCH RFC v4 1/6] arm64: support single-step and breakpoint handler hooks Sandeepa Prabhu
2013-10-25 15:22   ` Will Deacon
2013-12-03 14:33     ` Sandeepa Prabhu
2013-12-03 19:44       ` Will Deacon
2013-10-17 11:17 ` [PATCH RFC 2/6] arm64: Kprobes with single stepping support Sandeepa Prabhu
2013-11-08 16:56   ` Will Deacon
2013-11-09  9:10     ` Masami Hiramatsu
2013-11-11  5:39       ` Sandeepa Prabhu
2013-11-11  7:54         ` Masami Hiramatsu
2013-11-11 10:51           ` Masami Hiramatsu
2013-11-11 10:58             ` Will Deacon
2013-11-11 17:32               ` Masami Hiramatsu
2013-11-12  6:23                 ` Sandeepa Prabhu
2013-11-12  7:27                   ` Masami Hiramatsu
2013-11-12  8:44                     ` Sandeepa Prabhu
2013-11-12 10:17                       ` Masami Hiramatsu
2013-11-12 10:55                         ` Sandeepa Prabhu
2013-11-12 14:11                           ` Masami Hiramatsu
2013-11-12 16:59                           ` Steven Rostedt
2013-11-13 16:05                             ` Masami Hiramatsu
2013-11-13  6:55                     ` Sandeepa Prabhu
2013-11-13  7:08                       ` Sandeepa Prabhu [this message]
2013-11-13 14:07                       ` Masami Hiramatsu
2013-11-13 14:31                       ` Will Deacon
2013-11-13 15:55                         ` Sandeepa Prabhu
2013-11-15 16:39                           ` Will Deacon
2013-11-18  6:55                             ` Sandeepa Prabhu
2013-11-18  8:51                               ` Sandeepa Prabhu
2013-11-13 13:58               ` Peter Zijlstra
2013-11-13 14:20                 ` Will Deacon
2013-11-11  5:35     ` Sandeepa Prabhu
2013-11-11 11:21       ` Will Deacon
2013-11-12  6:52         ` Sandeepa Prabhu
2013-11-15 16:37           ` Will Deacon
2013-11-18  6:43             ` Sandeepa Prabhu
2013-10-17 11:17 ` [PATCH RFC 3/6] arm64: Kprobes instruction simulation support Sandeepa Prabhu
2013-11-08 17:03   ` Will Deacon
2013-11-11  5:58     ` Sandeepa Prabhu
2013-10-17 11:17 ` [PATCH RFC 4/6] arm64: Add kernel return probes support(kretprobes) Sandeepa Prabhu
2013-11-08 17:04   ` Will Deacon
2013-11-11  4:29     ` Sandeepa Prabhu
2013-11-11  7:53       ` AKASHI Takahiro
2013-11-11  8:55         ` Sandeepa Prabhu
2013-10-17 11:17 ` [PATCH RFC 5/6] arm64: Enable kprobes support for arm64 platform Sandeepa Prabhu
2013-10-17 11:17 ` [PATCH RFC 6/6] kprobes: Add cases for arm and arm64 in sample module Sandeepa Prabhu
2013-10-25 15:24   ` Will Deacon
2013-11-06 11:05     ` Sandeepa Prabhu
2013-10-18  8:32 ` [PATCH RFC v2 0/6] ARM64: Add kernel probes(Kprobes) support Masami Hiramatsu
2013-10-21  4:17   ` Sandeepa Prabhu

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