Pedro Fonseca
2013-Nov-09 17:30 UTC
Sync() causes null pointer dereference and warning message in run_clustered_refs()
Hi,
I''ve encountered a bug that triggers a warning message ("list_del
corruption. next->prev should be d9d0ae28, but was d9d5d5e8") and
subsequently causes a null pointer dereference while running a custom
test case on btrfs (kernel 3.11.1), inside a QEMU based VM.
The bug was triggered during the execution of two concurrent sync() calls.
Here''s the list of FS operations executed immediately before the
crash:> CPU: 0 Op: fdatasync
> CPU: 0 Op: btrfs_ioctl_device_delete
> CPU: 0 Op: rename (file: "d16/da6/l131" renamed to
"d16/d21/d38/l13b")
> CPU: 0 Op: btrfs_subvol_snapshot
> CPU: 1 Op: fdatasync
> CPU: 1 Op: btrfs_ioctl_device_delete
> CPU: 1 Op: rename (file: "d16/da6/l131" renamed to
> "d16/d21/d38/l13b")
> CPU: 1 Op: btrfs_subvol_snapshot
> CPU: 0 Op: dwrite (file: "d16/d21/f51")
> CPU: 0 Op: chown (file: "d16/da6/f114")
> CPU: 0 Op: write (file: "d16/d21/f107")
> CPU: 0 Op: sync
> CPU: 1 Op: dwrite (file: "d16/d21/f51")
> CPU: 1 Op: chown (file: "d16/c1c")
> CPU: 1 Op: write (file: "d16/d21/f107")
> CPU: 1 Op: sync
(Note that the entries in this log refer to the moment when the
operations were initiated, i.e., operations on different CPUs may overlap):
And here''s the system log output:> [ 127.830656] ------------[ cut here ]------------
> [ 127.830656] WARNING: CPU: 0 PID: 2791 at
>
/local/pfonseca/piking/kernel-build/linux-3.11.1-fs-static/lib/list_debug.c:62
> __list_del_entry+0x62/0x71()
> [ 127.830656] list_del corruption. next->prev should be d9d0ae28, but
> was d9d5d5e8
> [ 127.830656] Modules linked in: loop rtc_cmos pcspkr tpm_tis
> freq_table mperf i2c_piix4
> [ 127.830656] CPU: 0 PID: 2791 Comm: fsstress Not tainted 3.11.1 #2
> [ 127.830656] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
> [ 127.830656] 0000003e c4027dd8 c176917a c1a13c6e c4027df0 c102d1c0
> c138838f d9d0ae28
> [ 127.830656] d9d0ae28 d9d0ade0 c4027e08 c102d23b 00000009 c4027e00
> c1a13dad c4027e1c
> [ 127.830656] c4027e28 c138838f c1a13c6e 0000003e c1a13dad d9d0ae28
> d9d5d5e8 d9d0ade0
> [ 127.830656] Call Trace:
> [ 127.830656] [<c176917a>] dump_stack+0x41/0x57
> [ 127.830656] [<c102d1c0>] warn_slowpath_common+0x5e/0x75
> [ 127.830656] [<c138838f>] ? __list_del_entry+0x62/0x71
> [ 127.830656] [<c102d23b>] warn_slowpath_fmt+0x26/0x2a
> [ 127.830656] [<c138838f>] __list_del_entry+0x62/0x71
> [ 127.830656] [<c12a8564>] run_clustered_refs+0x877/0x8b0
> [ 127.830656] [<c12eed36>] ? btrfs_find_ref_cluster+0xc9/0x10e
> [ 127.830656] [<c12a878f>] btrfs_run_delayed_refs+0x1f2/0x35b
> [ 127.830656] [<c1075d14>] ? __delayacct_blkio_end+0x30/0x36
> [ 127.830656] [<c12b56b9>] btrfs_commit_transaction+0x60/0x986
> [ 127.830656] [<c12b6657>] ? start_transaction+0x320/0x3cd
> [ 127.830656] [<c12b671b>] ?
btrfs_attach_transaction_barrier+0x17/0x3c
> [ 127.830656] [<c1295b1a>] btrfs_sync_fs+0x4c/0x53
> [ 127.830656] [<c10c6f1b>] sync_fs_one_sb+0x17/0x19
> [ 127.830656] [<c10acab0>] iterate_supers+0x54/0x95
> [ 127.830656] [<c10c6f04>] ? SyS_splice+0x455/0x455
> [ 127.830656] [<c10c72dd>] sys_sync+0x46/0x70
> [ 127.830656] [<c176c2fe>] sysenter_do_call+0x12/0x26
> [ 127.830656] ---[ end trace 626899e11111abbe ]---
> [ 127.830656] BUG: unable to handle kernel NULL pointer dereference
> at (null)
> [ 127.830656] IP: [<c137ed3d>] rb_erase+0x177/0x236
> [ 127.830656] *pde = 00000000
> [ 127.830656] Oops: 0000 [#1] SMP
> [ 127.830656] Modules linked in: loop rtc_cmos pcspkr tpm_tis
> freq_table mperf i2c_piix4
> [ 127.830656] CPU: 0 PID: 2791 Comm: fsstress Tainted: G W 3.11.1 #2
> [ 127.830656] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
> [ 127.830656] task: de60efc0 ti: c4026000 task.ti: c4026000
> [ 127.830656] EIP: 0060:[<c137ed3d>] EFLAGS: 00000246 CPU: 0
> [ 127.830656] EIP is at rb_erase+0x177/0x236
> [ 127.830656] EAX: 00000000 EBX: 00000000 ECX: d9d0d180 EDX: d9cebddc
> [ 127.830656] ESI: 00000001 EDI: d9d0ade0 EBP: c4027e28 ESP: c4027e18
> [ 127.830656] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
> [ 127.830656] CR0: 8005003b CR2: 00000000 CR3: 059d8000 CR4: 00000690
> [ 127.830656] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
> [ 127.830656] DR6: 00000000 DR7: 00000000
> [ 127.830656] Stack:
> [ 127.830656] d9d0ade0 d9d0ade0 00000000 d9d0ade0 c4027eb8 c12a7fe0
> 00000000 00000001
> [ 127.830656] 00000000 00000002 00000000 c4027f0c 00cc9a28 d9cebddc
> de4d1000 0000095c
> [ 127.830656] de4d1000 00000007 00000000 0000001e d9cebd60 00000000
> 00000000 d9cebde0
> [ 127.830656] Call Trace:
> [ 127.830656] [<c12a7fe0>] run_clustered_refs+0x2f3/0x8b0
> [ 127.830656] [<c12eed36>] ? btrfs_find_ref_cluster+0xc9/0x10e
> [ 127.830656] [<c12a878f>] btrfs_run_delayed_refs+0x1f2/0x35b
> [ 127.830656] [<c1075d14>] ? __delayacct_blkio_end+0x30/0x36
> [ 127.830656] [<c12b56b9>] btrfs_commit_transaction+0x60/0x986
> [ 127.830656] [<c12b6657>] ? start_transaction+0x320/0x3cd
> [ 127.830656] [<c12b671b>] ?
btrfs_attach_transaction_barrier+0x17/0x3c
> [ 127.830656] [<c1295b1a>] btrfs_sync_fs+0x4c/0x53
> [ 127.830656] [<c10c6f1b>] sync_fs_one_sb+0x17/0x19
> [ 127.830656] [<c10acab0>] iterate_supers+0x54/0x95
> [ 127.830656] [<c10c6f04>] ? SyS_splice+0x455/0x455
> [ 127.830656] [<c10c72dd>] sys_sync+0x46/0x70
> [ 127.830656] [<c176c2fe>] sysenter_do_call+0x12/0x26
> [ 127.830656] Code: 73 04 85 f6 89 70 08 89 43 04 89 59 04 74 07 89
> c7 83 cf 01 89 3e 89 c6 89 d8 8b 58 08 89 59 04 89 48 08 e9 8c 00 00
> 00 8b 41 08 <f6> 00 01 75 2e 8b 58 04 89 ce 83 ce 01 89 59 08 89 48
04
> 89 33
> [ 127.830656] EIP: [<c137ed3d>] rb_erase+0x177/0x236 SS:ESP
0068:c4027e18
> [ 127.830656] CR2: 0000000000000000
> [ 127.830656] ---[ end trace 626899e11111abbf ]---
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Pedro Fonseca
2013-Nov-13 18:59 UTC
Re: Sync() causes null pointer dereference and warning message in run_clustered_refs()
Hi, Does anyone have an idea about what could be causing this null pointer bug? Pedro On 11/09/2013 06:30 PM, Pedro Fonseca wrote:> Hi, > > I''ve encountered a bug that triggers a warning message ("list_del > corruption. next->prev should be d9d0ae28, but was d9d5d5e8") and > subsequently causes a null pointer dereference while running a custom > test case on btrfs (kernel 3.11.1), inside a QEMU based VM. > > The bug was triggered during the execution of two concurrent sync() > calls. > > Here''s the list of FS operations executed immediately before the crash: >> CPU: 0 Op: fdatasync >> CPU: 0 Op: btrfs_ioctl_device_delete >> CPU: 0 Op: rename (file: "d16/da6/l131" renamed to "d16/d21/d38/l13b") >> CPU: 0 Op: btrfs_subvol_snapshot >> CPU: 1 Op: fdatasync >> CPU: 1 Op: btrfs_ioctl_device_delete >> CPU: 1 Op: rename (file: "d16/da6/l131" renamed to >> "d16/d21/d38/l13b") >> CPU: 1 Op: btrfs_subvol_snapshot >> CPU: 0 Op: dwrite (file: "d16/d21/f51") >> CPU: 0 Op: chown (file: "d16/da6/f114") >> CPU: 0 Op: write (file: "d16/d21/f107") >> CPU: 0 Op: sync >> CPU: 1 Op: dwrite (file: "d16/d21/f51") >> CPU: 1 Op: chown (file: "d16/c1c") >> CPU: 1 Op: write (file: "d16/d21/f107") >> CPU: 1 Op: sync > (Note that the entries in this log refer to the moment when the > operations were initiated, i.e., operations on different CPUs may > overlap): > > > And here''s the system log output: >> [ 127.830656] ------------[ cut here ]------------ >> [ 127.830656] WARNING: CPU: 0 PID: 2791 at >> /local/pfonseca/piking/kernel-build/linux-3.11.1-fs-static/lib/list_debug.c:62 >> __list_del_entry+0x62/0x71() >> [ 127.830656] list_del corruption. next->prev should be d9d0ae28, >> but was d9d5d5e8 >> [ 127.830656] Modules linked in: loop rtc_cmos pcspkr tpm_tis >> freq_table mperf i2c_piix4 >> [ 127.830656] CPU: 0 PID: 2791 Comm: fsstress Not tainted 3.11.1 #2 >> [ 127.830656] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007 >> [ 127.830656] 0000003e c4027dd8 c176917a c1a13c6e c4027df0 c102d1c0 >> c138838f d9d0ae28 >> [ 127.830656] d9d0ae28 d9d0ade0 c4027e08 c102d23b 00000009 c4027e00 >> c1a13dad c4027e1c >> [ 127.830656] c4027e28 c138838f c1a13c6e 0000003e c1a13dad d9d0ae28 >> d9d5d5e8 d9d0ade0 >> [ 127.830656] Call Trace: >> [ 127.830656] [<c176917a>] dump_stack+0x41/0x57 >> [ 127.830656] [<c102d1c0>] warn_slowpath_common+0x5e/0x75 >> [ 127.830656] [<c138838f>] ? __list_del_entry+0x62/0x71 >> [ 127.830656] [<c102d23b>] warn_slowpath_fmt+0x26/0x2a >> [ 127.830656] [<c138838f>] __list_del_entry+0x62/0x71 >> [ 127.830656] [<c12a8564>] run_clustered_refs+0x877/0x8b0 >> [ 127.830656] [<c12eed36>] ? btrfs_find_ref_cluster+0xc9/0x10e >> [ 127.830656] [<c12a878f>] btrfs_run_delayed_refs+0x1f2/0x35b >> [ 127.830656] [<c1075d14>] ? __delayacct_blkio_end+0x30/0x36 >> [ 127.830656] [<c12b56b9>] btrfs_commit_transaction+0x60/0x986 >> [ 127.830656] [<c12b6657>] ? start_transaction+0x320/0x3cd >> [ 127.830656] [<c12b671b>] ? >> btrfs_attach_transaction_barrier+0x17/0x3c >> [ 127.830656] [<c1295b1a>] btrfs_sync_fs+0x4c/0x53 >> [ 127.830656] [<c10c6f1b>] sync_fs_one_sb+0x17/0x19 >> [ 127.830656] [<c10acab0>] iterate_supers+0x54/0x95 >> [ 127.830656] [<c10c6f04>] ? SyS_splice+0x455/0x455 >> [ 127.830656] [<c10c72dd>] sys_sync+0x46/0x70 >> [ 127.830656] [<c176c2fe>] sysenter_do_call+0x12/0x26 >> [ 127.830656] ---[ end trace 626899e11111abbe ]--- >> [ 127.830656] BUG: unable to handle kernel NULL pointer dereference >> at (null) >> [ 127.830656] IP: [<c137ed3d>] rb_erase+0x177/0x236 >> [ 127.830656] *pde = 00000000 >> [ 127.830656] Oops: 0000 [#1] SMP >> [ 127.830656] Modules linked in: loop rtc_cmos pcspkr tpm_tis >> freq_table mperf i2c_piix4 >> [ 127.830656] CPU: 0 PID: 2791 Comm: fsstress Tainted: G W 3.11.1 #2 >> [ 127.830656] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007 >> [ 127.830656] task: de60efc0 ti: c4026000 task.ti: c4026000 >> [ 127.830656] EIP: 0060:[<c137ed3d>] EFLAGS: 00000246 CPU: 0 >> [ 127.830656] EIP is at rb_erase+0x177/0x236 >> [ 127.830656] EAX: 00000000 EBX: 00000000 ECX: d9d0d180 EDX: d9cebddc >> [ 127.830656] ESI: 00000001 EDI: d9d0ade0 EBP: c4027e28 ESP: c4027e18 >> [ 127.830656] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 >> [ 127.830656] CR0: 8005003b CR2: 00000000 CR3: 059d8000 CR4: 00000690 >> [ 127.830656] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 >> [ 127.830656] DR6: 00000000 DR7: 00000000 >> [ 127.830656] Stack: >> [ 127.830656] d9d0ade0 d9d0ade0 00000000 d9d0ade0 c4027eb8 c12a7fe0 >> 00000000 00000001 >> [ 127.830656] 00000000 00000002 00000000 c4027f0c 00cc9a28 d9cebddc >> de4d1000 0000095c >> [ 127.830656] de4d1000 00000007 00000000 0000001e d9cebd60 00000000 >> 00000000 d9cebde0 >> [ 127.830656] Call Trace: >> [ 127.830656] [<c12a7fe0>] run_clustered_refs+0x2f3/0x8b0 >> [ 127.830656] [<c12eed36>] ? btrfs_find_ref_cluster+0xc9/0x10e >> [ 127.830656] [<c12a878f>] btrfs_run_delayed_refs+0x1f2/0x35b >> [ 127.830656] [<c1075d14>] ? __delayacct_blkio_end+0x30/0x36 >> [ 127.830656] [<c12b56b9>] btrfs_commit_transaction+0x60/0x986 >> [ 127.830656] [<c12b6657>] ? start_transaction+0x320/0x3cd >> [ 127.830656] [<c12b671b>] ? >> btrfs_attach_transaction_barrier+0x17/0x3c >> [ 127.830656] [<c1295b1a>] btrfs_sync_fs+0x4c/0x53 >> [ 127.830656] [<c10c6f1b>] sync_fs_one_sb+0x17/0x19 >> [ 127.830656] [<c10acab0>] iterate_supers+0x54/0x95 >> [ 127.830656] [<c10c6f04>] ? SyS_splice+0x455/0x455 >> [ 127.830656] [<c10c72dd>] sys_sync+0x46/0x70 >> [ 127.830656] [<c176c2fe>] sysenter_do_call+0x12/0x26 >> [ 127.830656] Code: 73 04 85 f6 89 70 08 89 43 04 89 59 04 74 07 89 >> c7 83 cf 01 89 3e 89 c6 89 d8 8b 58 08 89 59 04 89 48 08 e9 8c 00 00 >> 00 8b 41 08 <f6> 00 01 75 2e 8b 58 04 89 ce 83 ce 01 89 59 08 89 48 >> 04 89 33 >> [ 127.830656] EIP: [<c137ed3d>] rb_erase+0x177/0x236 SS:ESP >> 0068:c4027e18 >> [ 127.830656] CR2: 0000000000000000 >> [ 127.830656] ---[ end trace 626899e11111abbf ]--- > > -- > 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-- 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
Liu Bo
2013-Nov-14 02:46 UTC
Re: Sync() causes null pointer dereference and warning message in run_clustered_refs()
On Sat, Nov 09, 2013 at 09:30:50AM -0800, Pedro Fonseca wrote:> Hi, > > I''ve encountered a bug that triggers a warning message ("list_del > corruption. next->prev should be d9d0ae28, but was d9d5d5e8") and > subsequently causes a null pointer dereference while running a > custom test case on btrfs (kernel 3.11.1), inside a QEMU based VM. > > The bug was triggered during the execution of two concurrent sync() calls. > > Here''s the list of FS operations executed immediately before the crash: > >CPU: 0 Op: fdatasync > >CPU: 0 Op: btrfs_ioctl_device_delete > >CPU: 0 Op: rename (file: "d16/da6/l131" renamed to "d16/d21/d38/l13b") > >CPU: 0 Op: btrfs_subvol_snapshot > > CPU: 1 Op: fdatasync > > CPU: 1 Op: btrfs_ioctl_device_delete > > CPU: 1 Op: rename (file: "d16/da6/l131" renamed to > >"d16/d21/d38/l13b") > > CPU: 1 Op: btrfs_subvol_snapshot > >CPU: 0 Op: dwrite (file: "d16/d21/f51") > >CPU: 0 Op: chown (file: "d16/da6/f114") > >CPU: 0 Op: write (file: "d16/d21/f107") > >CPU: 0 Op: sync > > CPU: 1 Op: dwrite (file: "d16/d21/f51") > > CPU: 1 Op: chown (file: "d16/c1c") > > CPU: 1 Op: write (file: "d16/d21/f107") > > CPU: 1 Op: sync > (Note that the entries in this log refer to the moment when the > operations were initiated, i.e., operations on different CPUs may > overlap): > > > And here''s the system log output: > >[ 127.830656] ------------[ cut here ]------------ > >[ 127.830656] WARNING: CPU: 0 PID: 2791 at /local/pfonseca/piking/kernel-build/linux-3.11.1-fs-static/lib/list_debug.c:62 > >__list_del_entry+0x62/0x71() > >[ 127.830656] list_del corruption. next->prev should be d9d0ae28, > >but was d9d5d5e8 > >[ 127.830656] Modules linked in: loop rtc_cmos pcspkr tpm_tis > >freq_table mperf i2c_piix4 > >[ 127.830656] CPU: 0 PID: 2791 Comm: fsstress Not tainted 3.11.1 #2 > >[ 127.830656] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007 > >[ 127.830656] 0000003e c4027dd8 c176917a c1a13c6e c4027df0 > >c102d1c0 c138838f d9d0ae28 > >[ 127.830656] d9d0ae28 d9d0ade0 c4027e08 c102d23b 00000009 > >c4027e00 c1a13dad c4027e1c > >[ 127.830656] c4027e28 c138838f c1a13c6e 0000003e c1a13dad > >d9d0ae28 d9d5d5e8 d9d0ade0 > >[ 127.830656] Call Trace: > >[ 127.830656] [<c176917a>] dump_stack+0x41/0x57 > >[ 127.830656] [<c102d1c0>] warn_slowpath_common+0x5e/0x75 > >[ 127.830656] [<c138838f>] ? __list_del_entry+0x62/0x71 > >[ 127.830656] [<c102d23b>] warn_slowpath_fmt+0x26/0x2a > >[ 127.830656] [<c138838f>] __list_del_entry+0x62/0x71 > >[ 127.830656] [<c12a8564>] run_clustered_refs+0x877/0x8b0Could you please show what run_clustered_refs+0x877 refers to? Something like, gdb> l *run_clustered_refs+0x877 -liubo> >[ 127.830656] [<c12eed36>] ? btrfs_find_ref_cluster+0xc9/0x10e > >[ 127.830656] [<c12a878f>] btrfs_run_delayed_refs+0x1f2/0x35b > >[ 127.830656] [<c1075d14>] ? __delayacct_blkio_end+0x30/0x36 > >[ 127.830656] [<c12b56b9>] btrfs_commit_transaction+0x60/0x986 > >[ 127.830656] [<c12b6657>] ? start_transaction+0x320/0x3cd > >[ 127.830656] [<c12b671b>] ? btrfs_attach_transaction_barrier+0x17/0x3c > >[ 127.830656] [<c1295b1a>] btrfs_sync_fs+0x4c/0x53 > >[ 127.830656] [<c10c6f1b>] sync_fs_one_sb+0x17/0x19 > >[ 127.830656] [<c10acab0>] iterate_supers+0x54/0x95 > >[ 127.830656] [<c10c6f04>] ? SyS_splice+0x455/0x455 > >[ 127.830656] [<c10c72dd>] sys_sync+0x46/0x70 > >[ 127.830656] [<c176c2fe>] sysenter_do_call+0x12/0x26 > >[ 127.830656] ---[ end trace 626899e11111abbe ]--- > >[ 127.830656] BUG: unable to handle kernel NULL pointer > >dereference at (null) > >[ 127.830656] IP: [<c137ed3d>] rb_erase+0x177/0x236 > >[ 127.830656] *pde = 00000000 > >[ 127.830656] Oops: 0000 [#1] SMP > >[ 127.830656] Modules linked in: loop rtc_cmos pcspkr tpm_tis > >freq_table mperf i2c_piix4 > >[ 127.830656] CPU: 0 PID: 2791 Comm: fsstress Tainted: G W 3.11.1 #2 > >[ 127.830656] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007 > >[ 127.830656] task: de60efc0 ti: c4026000 task.ti: c4026000 > >[ 127.830656] EIP: 0060:[<c137ed3d>] EFLAGS: 00000246 CPU: 0 > >[ 127.830656] EIP is at rb_erase+0x177/0x236 > >[ 127.830656] EAX: 00000000 EBX: 00000000 ECX: d9d0d180 EDX: d9cebddc > >[ 127.830656] ESI: 00000001 EDI: d9d0ade0 EBP: c4027e28 ESP: c4027e18 > >[ 127.830656] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 > >[ 127.830656] CR0: 8005003b CR2: 00000000 CR3: 059d8000 CR4: 00000690 > >[ 127.830656] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 > >[ 127.830656] DR6: 00000000 DR7: 00000000 > >[ 127.830656] Stack: > >[ 127.830656] d9d0ade0 d9d0ade0 00000000 d9d0ade0 c4027eb8 > >c12a7fe0 00000000 00000001 > >[ 127.830656] 00000000 00000002 00000000 c4027f0c 00cc9a28 > >d9cebddc de4d1000 0000095c > >[ 127.830656] de4d1000 00000007 00000000 0000001e d9cebd60 > >00000000 00000000 d9cebde0 > >[ 127.830656] Call Trace: > >[ 127.830656] [<c12a7fe0>] run_clustered_refs+0x2f3/0x8b0 > >[ 127.830656] [<c12eed36>] ? btrfs_find_ref_cluster+0xc9/0x10e > >[ 127.830656] [<c12a878f>] btrfs_run_delayed_refs+0x1f2/0x35b > >[ 127.830656] [<c1075d14>] ? __delayacct_blkio_end+0x30/0x36 > >[ 127.830656] [<c12b56b9>] btrfs_commit_transaction+0x60/0x986 > >[ 127.830656] [<c12b6657>] ? start_transaction+0x320/0x3cd > >[ 127.830656] [<c12b671b>] ? btrfs_attach_transaction_barrier+0x17/0x3c > >[ 127.830656] [<c1295b1a>] btrfs_sync_fs+0x4c/0x53 > >[ 127.830656] [<c10c6f1b>] sync_fs_one_sb+0x17/0x19 > >[ 127.830656] [<c10acab0>] iterate_supers+0x54/0x95 > >[ 127.830656] [<c10c6f04>] ? SyS_splice+0x455/0x455 > >[ 127.830656] [<c10c72dd>] sys_sync+0x46/0x70 > >[ 127.830656] [<c176c2fe>] sysenter_do_call+0x12/0x26 > >[ 127.830656] Code: 73 04 85 f6 89 70 08 89 43 04 89 59 04 74 07 > >89 c7 83 cf 01 89 3e 89 c6 89 d8 8b 58 08 89 59 04 89 48 08 e9 8c > >00 00 00 8b 41 08 <f6> 00 01 75 2e 8b 58 04 89 ce 83 ce 01 89 59 > >08 89 48 04 89 33 > >[ 127.830656] EIP: [<c137ed3d>] rb_erase+0x177/0x236 SS:ESP 0068:c4027e18 > >[ 127.830656] CR2: 0000000000000000 > >[ 127.830656] ---[ end trace 626899e11111abbf ]--- > > -- > 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-- 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
Pedro Fonseca
2013-Nov-19 10:10 UTC
Re: Sync() causes null pointer dereference and warning message in run_clustered_refs()
Hi Liu, Sorry, somehow I missed your email. Let me know if you need additional information. Here''s the result of "objdump -d -S" nearby "run_clustered_refs+0x877":> c12a854f: 83 c4 0c add $0xc,%esp > c12a8552: eb 3f jmp c12a8593 <run_clustered_refs+0x8a6> > * a node might live in a head or a regular ref, this lets you > * test for the proper type to use. > */ > static int btrfs_delayed_ref_is_head(struct btrfs_delayed_ref_node *node) > { > return node->is_head; > c12a8554: f6 43 2e 01 testb $0x1,0x2e(%ebx) > c12a8558: 74 1a je c12a8574 <run_clustered_refs+0x887> > * have been dealt with, and we will pick the next head to deal > * with, so we must unlock the head and drop it from the cluster > * list before we release it. */ > if (btrfs_delayed_ref_is_head(ref)) { > list_del_init(&locked_ref->cluster); > c12a855a: 8d 77 48 lea 0x48(%edi),%esi > * list_del_init - deletes entry from list and reinitialize it. > * @entry: the element to delete from the list. > */ > static inline void list_del_init(struct list_head *entry) > { > __list_del_entry(entry); > c12a855d: 89 f0 mov %esi,%eax > c12a855f: e8 c9 fd 0d 00 call c138832d <__list_del_entry> > btrfs_find_delayed_ref_head(struct btrfs_trans_handle *trans, u64 bytenr); > int btrfs_delayed_ref_lock(struct btrfs_trans_handle *trans, > struct btrfs_delayed_ref_head *head); > static inline void btrfs_delayed_ref_unlock(struct btrfs_delayed_ref_head *head) > { > mutex_unlock(&head->mutex); > c12a8564: 8d 47 30 lea 0x30(%edi),%eax > #define LIST_HEAD(name) \ > struct list_head name = LIST_HEAD_INIT(name) > > static inline void INIT_LIST_HEAD(struct list_head *list) > { > list->next = list; > c12a8567: 89 77 48 mov %esi,0x48(%edi) > list->prev = list; > c12a856a: 89 77 4c mov %esi,0x4c(%edi) > c12a856d: 31 ff xor %edi,%edi > c12a856f: e8 1f 0f 4c 00 call c1769493 <mutex_unlock>Pedro On 11/14/13 03:46 , Liu Bo wrote:> On Sat, Nov 09, 2013 at 09:30:50AM -0800, Pedro Fonseca wrote: >> Hi, >> >> I''ve encountered a bug that triggers a warning message ("list_del >> corruption. next->prev should be d9d0ae28, but was d9d5d5e8") and >> subsequently causes a null pointer dereference while running a >> custom test case on btrfs (kernel 3.11.1), inside a QEMU based VM. >> >> The bug was triggered during the execution of two concurrent sync() calls. >> >> Here''s the list of FS operations executed immediately before the crash: >>> CPU: 0 Op: fdatasync >>> CPU: 0 Op: btrfs_ioctl_device_delete >>> CPU: 0 Op: rename (file: "d16/da6/l131" renamed to "d16/d21/d38/l13b") >>> CPU: 0 Op: btrfs_subvol_snapshot >>> CPU: 1 Op: fdatasync >>> CPU: 1 Op: btrfs_ioctl_device_delete >>> CPU: 1 Op: rename (file: "d16/da6/l131" renamed to >>> "d16/d21/d38/l13b") >>> CPU: 1 Op: btrfs_subvol_snapshot >>> CPU: 0 Op: dwrite (file: "d16/d21/f51") >>> CPU: 0 Op: chown (file: "d16/da6/f114") >>> CPU: 0 Op: write (file: "d16/d21/f107") >>> CPU: 0 Op: sync >>> CPU: 1 Op: dwrite (file: "d16/d21/f51") >>> CPU: 1 Op: chown (file: "d16/c1c") >>> CPU: 1 Op: write (file: "d16/d21/f107") >>> CPU: 1 Op: sync >> (Note that the entries in this log refer to the moment when the >> operations were initiated, i.e., operations on different CPUs may >> overlap): >> >> >> And here''s the system log output: >>> [ 127.830656] ------------[ cut here ]------------ >>> [ 127.830656] WARNING: CPU: 0 PID: 2791 at /local/pfonseca/piking/kernel-build/linux-3.11.1-fs-static/lib/list_debug.c:62 >>> __list_del_entry+0x62/0x71() >>> [ 127.830656] list_del corruption. next->prev should be d9d0ae28, >>> but was d9d5d5e8 >>> [ 127.830656] Modules linked in: loop rtc_cmos pcspkr tpm_tis >>> freq_table mperf i2c_piix4 >>> [ 127.830656] CPU: 0 PID: 2791 Comm: fsstress Not tainted 3.11.1 #2 >>> [ 127.830656] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007 >>> [ 127.830656] 0000003e c4027dd8 c176917a c1a13c6e c4027df0 >>> c102d1c0 c138838f d9d0ae28 >>> [ 127.830656] d9d0ae28 d9d0ade0 c4027e08 c102d23b 00000009 >>> c4027e00 c1a13dad c4027e1c >>> [ 127.830656] c4027e28 c138838f c1a13c6e 0000003e c1a13dad >>> d9d0ae28 d9d5d5e8 d9d0ade0 >>> [ 127.830656] Call Trace: >>> [ 127.830656] [<c176917a>] dump_stack+0x41/0x57 >>> [ 127.830656] [<c102d1c0>] warn_slowpath_common+0x5e/0x75 >>> [ 127.830656] [<c138838f>] ? __list_del_entry+0x62/0x71 >>> [ 127.830656] [<c102d23b>] warn_slowpath_fmt+0x26/0x2a >>> [ 127.830656] [<c138838f>] __list_del_entry+0x62/0x71 >>> [ 127.830656] [<c12a8564>] run_clustered_refs+0x877/0x8b0 > > > Could you please show what run_clustered_refs+0x877 refers to? > > Something like, > gdb> l *run_clustered_refs+0x877 > > -liubo > >>> [ 127.830656] [<c12eed36>] ? btrfs_find_ref_cluster+0xc9/0x10e >>> [ 127.830656] [<c12a878f>] btrfs_run_delayed_refs+0x1f2/0x35b >>> [ 127.830656] [<c1075d14>] ? __delayacct_blkio_end+0x30/0x36 >>> [ 127.830656] [<c12b56b9>] btrfs_commit_transaction+0x60/0x986 >>> [ 127.830656] [<c12b6657>] ? start_transaction+0x320/0x3cd >>> [ 127.830656] [<c12b671b>] ? btrfs_attach_transaction_barrier+0x17/0x3c >>> [ 127.830656] [<c1295b1a>] btrfs_sync_fs+0x4c/0x53 >>> [ 127.830656] [<c10c6f1b>] sync_fs_one_sb+0x17/0x19 >>> [ 127.830656] [<c10acab0>] iterate_supers+0x54/0x95 >>> [ 127.830656] [<c10c6f04>] ? SyS_splice+0x455/0x455 >>> [ 127.830656] [<c10c72dd>] sys_sync+0x46/0x70 >>> [ 127.830656] [<c176c2fe>] sysenter_do_call+0x12/0x26 >>> [ 127.830656] ---[ end trace 626899e11111abbe ]--- >>> [ 127.830656] BUG: unable to handle kernel NULL pointer >>> dereference at (null) >>> [ 127.830656] IP: [<c137ed3d>] rb_erase+0x177/0x236 >>> [ 127.830656] *pde = 00000000 >>> [ 127.830656] Oops: 0000 [#1] SMP >>> [ 127.830656] Modules linked in: loop rtc_cmos pcspkr tpm_tis >>> freq_table mperf i2c_piix4 >>> [ 127.830656] CPU: 0 PID: 2791 Comm: fsstress Tainted: G W 3.11.1 #2 >>> [ 127.830656] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007 >>> [ 127.830656] task: de60efc0 ti: c4026000 task.ti: c4026000 >>> [ 127.830656] EIP: 0060:[<c137ed3d>] EFLAGS: 00000246 CPU: 0 >>> [ 127.830656] EIP is at rb_erase+0x177/0x236 >>> [ 127.830656] EAX: 00000000 EBX: 00000000 ECX: d9d0d180 EDX: d9cebddc >>> [ 127.830656] ESI: 00000001 EDI: d9d0ade0 EBP: c4027e28 ESP: c4027e18 >>> [ 127.830656] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 >>> [ 127.830656] CR0: 8005003b CR2: 00000000 CR3: 059d8000 CR4: 00000690 >>> [ 127.830656] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 >>> [ 127.830656] DR6: 00000000 DR7: 00000000 >>> [ 127.830656] Stack: >>> [ 127.830656] d9d0ade0 d9d0ade0 00000000 d9d0ade0 c4027eb8 >>> c12a7fe0 00000000 00000001 >>> [ 127.830656] 00000000 00000002 00000000 c4027f0c 00cc9a28 >>> d9cebddc de4d1000 0000095c >>> [ 127.830656] de4d1000 00000007 00000000 0000001e d9cebd60 >>> 00000000 00000000 d9cebde0 >>> [ 127.830656] Call Trace: >>> [ 127.830656] [<c12a7fe0>] run_clustered_refs+0x2f3/0x8b0 >>> [ 127.830656] [<c12eed36>] ? btrfs_find_ref_cluster+0xc9/0x10e >>> [ 127.830656] [<c12a878f>] btrfs_run_delayed_refs+0x1f2/0x35b >>> [ 127.830656] [<c1075d14>] ? __delayacct_blkio_end+0x30/0x36 >>> [ 127.830656] [<c12b56b9>] btrfs_commit_transaction+0x60/0x986 >>> [ 127.830656] [<c12b6657>] ? start_transaction+0x320/0x3cd >>> [ 127.830656] [<c12b671b>] ? btrfs_attach_transaction_barrier+0x17/0x3c >>> [ 127.830656] [<c1295b1a>] btrfs_sync_fs+0x4c/0x53 >>> [ 127.830656] [<c10c6f1b>] sync_fs_one_sb+0x17/0x19 >>> [ 127.830656] [<c10acab0>] iterate_supers+0x54/0x95 >>> [ 127.830656] [<c10c6f04>] ? SyS_splice+0x455/0x455 >>> [ 127.830656] [<c10c72dd>] sys_sync+0x46/0x70 >>> [ 127.830656] [<c176c2fe>] sysenter_do_call+0x12/0x26 >>> [ 127.830656] Code: 73 04 85 f6 89 70 08 89 43 04 89 59 04 74 07 >>> 89 c7 83 cf 01 89 3e 89 c6 89 d8 8b 58 08 89 59 04 89 48 08 e9 8c >>> 00 00 00 8b 41 08 <f6> 00 01 75 2e 8b 58 04 89 ce 83 ce 01 89 59 >>> 08 89 48 04 89 33 >>> [ 127.830656] EIP: [<c137ed3d>] rb_erase+0x177/0x236 SS:ESP 0068:c4027e18 >>> [ 127.830656] CR2: 0000000000000000 >>> [ 127.830656] ---[ end trace 626899e11111abbf ]--- >> >> -- >> 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 > -- > 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 >-- 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
Liu Bo
2013-Nov-28 04:03 UTC
Re: Sync() causes null pointer dereference and warning message in run_clustered_refs()
Hi Pedro,
Could you please verfiy that if the commit work for you?
This commit[1] has been merged during 3.11-rc7.
-liubo
commit b8d0c69b9469ffd33df30fee3e990f2d4aa68a09
Author: Josef Bacik <jbacik@fusionio.com>
Date: Thu Aug 22 17:03:29 2013 -0400
Btrfs: remove ourselves from the cluster list under lock
A user was reporting weird warnings from btrfs_put_delayed_ref() and I
noticed
that we were doing this list_del_init() on our head ref outside of
delayed_refs->lock. This is a problem if we have people still on the
list, we
could end up modifying old pointers and such. Fix this by removing us from
the
list before we do our run_delayed_ref on our head ref. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 6908333..cfb3cf7 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -2440,6 +2440,8 @@ static noinline int run_clustered_refs(struct
btrfs_trans_handle *trans,
default:
WARN_ON(1);
}
+ } else {
+ list_del_init(&locked_ref->cluster);
}
spin_unlock(&delayed_refs->lock);
@@ -2462,7 +2464,6 @@ static noinline int run_clustered_refs(struct
btrfs_trans_handle *trans,
* list before we release it.
*/
if (btrfs_delayed_ref_is_head(ref)) {
- list_del_init(&locked_ref->cluster);
btrfs_delayed_ref_unlock(locked_ref);
locked_ref = NULL;
}
On Tue, Nov 19, 2013 at 11:10:22AM +0100, Pedro Fonseca
wrote:> Hi Liu,
>
> Sorry, somehow I missed your email.
>
> Let me know if you need additional information. Here''s the result
of "objdump -d -S" nearby "run_clustered_refs+0x877":
>
> >c12a854f: 83 c4 0c add $0xc,%esp
> >c12a8552: eb 3f jmp c12a8593
<run_clustered_refs+0x8a6>
> > * a node might live in a head or a regular ref, this lets you
> > * test for the proper type to use.
> > */
> >static int btrfs_delayed_ref_is_head(struct btrfs_delayed_ref_node
*node)
> >{
> > return node->is_head;
> >c12a8554: f6 43 2e 01 testb $0x1,0x2e(%ebx)
> >c12a8558: 74 1a je c12a8574
<run_clustered_refs+0x887>
> > * have been dealt with, and we will pick the next head to deal
> > * with, so we must unlock the head and drop it from the
cluster
> > * list before we release it. */
> > if (btrfs_delayed_ref_is_head(ref)) {
> > list_del_init(&locked_ref->cluster);
> >c12a855a: 8d 77 48 lea 0x48(%edi),%esi
> > * list_del_init - deletes entry from list and reinitialize it.
> > * @entry: the element to delete from the list.
> > */
> >static inline void list_del_init(struct list_head *entry)
> >{
> > __list_del_entry(entry);
> >c12a855d: 89 f0 mov %esi,%eax
> >c12a855f: e8 c9 fd 0d 00 call c138832d
<__list_del_entry>
> >btrfs_find_delayed_ref_head(struct btrfs_trans_handle *trans, u64
bytenr);
> >int btrfs_delayed_ref_lock(struct btrfs_trans_handle *trans,
> > struct btrfs_delayed_ref_head *head);
> >static inline void btrfs_delayed_ref_unlock(struct
btrfs_delayed_ref_head *head)
> >{
> > mutex_unlock(&head->mutex);
> >c12a8564: 8d 47 30 lea 0x30(%edi),%eax
> >#define LIST_HEAD(name) \
> > struct list_head name = LIST_HEAD_INIT(name)
> >
> >static inline void INIT_LIST_HEAD(struct list_head *list)
> >{
> > list->next = list;
> >c12a8567: 89 77 48 mov %esi,0x48(%edi)
> > list->prev = list;
> >c12a856a: 89 77 4c mov %esi,0x4c(%edi)
> >c12a856d: 31 ff xor %edi,%edi
> >c12a856f: e8 1f 0f 4c 00 call c1769493
<mutex_unlock>
>
>
> Pedro
>
>
>
> On 11/14/13 03:46 , Liu Bo wrote:
> >On Sat, Nov 09, 2013 at 09:30:50AM -0800, Pedro Fonseca wrote:
> >>Hi,
> >>
> >>I''ve encountered a bug that triggers a warning message
("list_del
> >>corruption. next->prev should be d9d0ae28, but was
d9d5d5e8") and
> >>subsequently causes a null pointer dereference while running a
> >>custom test case on btrfs (kernel 3.11.1), inside a QEMU based VM.
> >>
> >>The bug was triggered during the execution of two concurrent sync()
calls.
> >>
> >>Here''s the list of FS operations executed immediately
before the crash:
> >>>CPU: 0 Op: fdatasync
> >>>CPU: 0 Op: btrfs_ioctl_device_delete
> >>>CPU: 0 Op: rename (file: "d16/da6/l131" renamed to
"d16/d21/d38/l13b")
> >>>CPU: 0 Op: btrfs_subvol_snapshot
> >>> CPU: 1 Op: fdatasync
> >>> CPU: 1 Op: btrfs_ioctl_device_delete
> >>> CPU: 1 Op: rename (file: "d16/da6/l131"
renamed to
> >>>"d16/d21/d38/l13b")
> >>> CPU: 1 Op: btrfs_subvol_snapshot
> >>>CPU: 0 Op: dwrite (file: "d16/d21/f51")
> >>>CPU: 0 Op: chown (file: "d16/da6/f114")
> >>>CPU: 0 Op: write (file: "d16/d21/f107")
> >>>CPU: 0 Op: sync
> >>> CPU: 1 Op: dwrite (file: "d16/d21/f51")
> >>> CPU: 1 Op: chown (file: "d16/c1c")
> >>> CPU: 1 Op: write (file: "d16/d21/f107")
> >>> CPU: 1 Op: sync
> >>(Note that the entries in this log refer to the moment when the
> >>operations were initiated, i.e., operations on different CPUs may
> >>overlap):
> >>
> >>
> >>And here''s the system log output:
> >>>[ 127.830656] ------------[ cut here ]------------
> >>>[ 127.830656] WARNING: CPU: 0 PID: 2791 at
/local/pfonseca/piking/kernel-build/linux-3.11.1-fs-static/lib/list_debug.c:62
> >>>__list_del_entry+0x62/0x71()
> >>>[ 127.830656] list_del corruption. next->prev should be
d9d0ae28,
> >>>but was d9d5d5e8
> >>>[ 127.830656] Modules linked in: loop rtc_cmos pcspkr tpm_tis
> >>>freq_table mperf i2c_piix4
> >>>[ 127.830656] CPU: 0 PID: 2791 Comm: fsstress Not tainted
3.11.1 #2
> >>>[ 127.830656] Hardware name: Bochs Bochs, BIOS Bochs
01/01/2007
> >>>[ 127.830656] 0000003e c4027dd8 c176917a c1a13c6e c4027df0
> >>>c102d1c0 c138838f d9d0ae28
> >>>[ 127.830656] d9d0ae28 d9d0ade0 c4027e08 c102d23b 00000009
> >>>c4027e00 c1a13dad c4027e1c
> >>>[ 127.830656] c4027e28 c138838f c1a13c6e 0000003e c1a13dad
> >>>d9d0ae28 d9d5d5e8 d9d0ade0
> >>>[ 127.830656] Call Trace:
> >>>[ 127.830656] [<c176917a>] dump_stack+0x41/0x57
> >>>[ 127.830656] [<c102d1c0>]
warn_slowpath_common+0x5e/0x75
> >>>[ 127.830656] [<c138838f>] ? __list_del_entry+0x62/0x71
> >>>[ 127.830656] [<c102d23b>] warn_slowpath_fmt+0x26/0x2a
> >>>[ 127.830656] [<c138838f>] __list_del_entry+0x62/0x71
> >>>[ 127.830656] [<c12a8564>]
run_clustered_refs+0x877/0x8b0
> >
> >
> >Could you please show what run_clustered_refs+0x877 refers to?
> >
> >Something like,
> >gdb> l *run_clustered_refs+0x877
> >
> >-liubo
> >
> >>>[ 127.830656] [<c12eed36>] ?
btrfs_find_ref_cluster+0xc9/0x10e
> >>>[ 127.830656] [<c12a878f>]
btrfs_run_delayed_refs+0x1f2/0x35b
> >>>[ 127.830656] [<c1075d14>] ?
__delayacct_blkio_end+0x30/0x36
> >>>[ 127.830656] [<c12b56b9>]
btrfs_commit_transaction+0x60/0x986
> >>>[ 127.830656] [<c12b6657>] ?
start_transaction+0x320/0x3cd
> >>>[ 127.830656] [<c12b671b>] ?
btrfs_attach_transaction_barrier+0x17/0x3c
> >>>[ 127.830656] [<c1295b1a>] btrfs_sync_fs+0x4c/0x53
> >>>[ 127.830656] [<c10c6f1b>] sync_fs_one_sb+0x17/0x19
> >>>[ 127.830656] [<c10acab0>] iterate_supers+0x54/0x95
> >>>[ 127.830656] [<c10c6f04>] ? SyS_splice+0x455/0x455
> >>>[ 127.830656] [<c10c72dd>] sys_sync+0x46/0x70
> >>>[ 127.830656] [<c176c2fe>] sysenter_do_call+0x12/0x26
> >>>[ 127.830656] ---[ end trace 626899e11111abbe ]---
> >>>[ 127.830656] BUG: unable to handle kernel NULL pointer
> >>>dereference at (null)
> >>>[ 127.830656] IP: [<c137ed3d>] rb_erase+0x177/0x236
> >>>[ 127.830656] *pde = 00000000
> >>>[ 127.830656] Oops: 0000 [#1] SMP
> >>>[ 127.830656] Modules linked in: loop rtc_cmos pcspkr tpm_tis
> >>>freq_table mperf i2c_piix4
> >>>[ 127.830656] CPU: 0 PID: 2791 Comm: fsstress Tainted: G W
3.11.1 #2
> >>>[ 127.830656] Hardware name: Bochs Bochs, BIOS Bochs
01/01/2007
> >>>[ 127.830656] task: de60efc0 ti: c4026000 task.ti: c4026000
> >>>[ 127.830656] EIP: 0060:[<c137ed3d>] EFLAGS: 00000246
CPU: 0
> >>>[ 127.830656] EIP is at rb_erase+0x177/0x236
> >>>[ 127.830656] EAX: 00000000 EBX: 00000000 ECX: d9d0d180 EDX:
d9cebddc
> >>>[ 127.830656] ESI: 00000001 EDI: d9d0ade0 EBP: c4027e28 ESP:
c4027e18
> >>>[ 127.830656] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
> >>>[ 127.830656] CR0: 8005003b CR2: 00000000 CR3: 059d8000 CR4:
00000690
> >>>[ 127.830656] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3:
00000000
> >>>[ 127.830656] DR6: 00000000 DR7: 00000000
> >>>[ 127.830656] Stack:
> >>>[ 127.830656] d9d0ade0 d9d0ade0 00000000 d9d0ade0 c4027eb8
> >>>c12a7fe0 00000000 00000001
> >>>[ 127.830656] 00000000 00000002 00000000 c4027f0c 00cc9a28
> >>>d9cebddc de4d1000 0000095c
> >>>[ 127.830656] de4d1000 00000007 00000000 0000001e d9cebd60
> >>>00000000 00000000 d9cebde0
> >>>[ 127.830656] Call Trace:
> >>>[ 127.830656] [<c12a7fe0>]
run_clustered_refs+0x2f3/0x8b0
> >>>[ 127.830656] [<c12eed36>] ?
btrfs_find_ref_cluster+0xc9/0x10e
> >>>[ 127.830656] [<c12a878f>]
btrfs_run_delayed_refs+0x1f2/0x35b
> >>>[ 127.830656] [<c1075d14>] ?
__delayacct_blkio_end+0x30/0x36
> >>>[ 127.830656] [<c12b56b9>]
btrfs_commit_transaction+0x60/0x986
> >>>[ 127.830656] [<c12b6657>] ?
start_transaction+0x320/0x3cd
> >>>[ 127.830656] [<c12b671b>] ?
btrfs_attach_transaction_barrier+0x17/0x3c
> >>>[ 127.830656] [<c1295b1a>] btrfs_sync_fs+0x4c/0x53
> >>>[ 127.830656] [<c10c6f1b>] sync_fs_one_sb+0x17/0x19
> >>>[ 127.830656] [<c10acab0>] iterate_supers+0x54/0x95
> >>>[ 127.830656] [<c10c6f04>] ? SyS_splice+0x455/0x455
> >>>[ 127.830656] [<c10c72dd>] sys_sync+0x46/0x70
> >>>[ 127.830656] [<c176c2fe>] sysenter_do_call+0x12/0x26
> >>>[ 127.830656] Code: 73 04 85 f6 89 70 08 89 43 04 89 59 04 74
07
> >>>89 c7 83 cf 01 89 3e 89 c6 89 d8 8b 58 08 89 59 04 89 48 08 e9
8c
> >>>00 00 00 8b 41 08 <f6> 00 01 75 2e 8b 58 04 89 ce 83 ce
01 89 59
> >>>08 89 48 04 89 33
> >>>[ 127.830656] EIP: [<c137ed3d>] rb_erase+0x177/0x236
SS:ESP 0068:c4027e18
> >>>[ 127.830656] CR2: 0000000000000000
> >>>[ 127.830656] ---[ end trace 626899e11111abbf ]---
> >>
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