----- Original Message -----
> From: "CAI Qian" <caiqian@xxxxxxxxxx>
> To: "Jan Kara" <jack@xxxxxxx>, "Miklos Szeredi" <miklos@xxxxxxxxxx>, "tj" <tj@xxxxxxxxxx>, "Al Viro"
> <viro@xxxxxxxxxxxxxxxxxx>, "Linus Torvalds" <torvalds@xxxxxxxxxxxxxxxxxxxx>, "Dave Chinner" <david@xxxxxxxxxxxxx>
> Cc: "linux-xfs" <linux-xfs@xxxxxxxxxxxxxxx>, "Jens Axboe" <axboe@xxxxxxxxx>, "Nick Piggin" <npiggin@xxxxxxxxx>,
> linux-fsdevel@xxxxxxxxxxxxxxx, "Dave Jones" <davej@xxxxxxxxxxxxxxxxx>
> Sent: Friday, October 7, 2016 11:27:55 AM
> Subject: Re: local DoS - systemd hang or timeout (WAS: Re: [RFC][CFT] splice_read reworked)
>
>
>
> > Hmm, this round of trinity triggered a different hang.
> This hang is reproducible so far with the command below on a overlayfs/xfs,
Another data point is that this hang can also be reproduced using device-mapper thinp
as the docker backend.
CAI Qian
[12047.714409] INFO: task trinity-c0:3716 blocked for more than 120 seconds.
[12047.722033] Not tainted 4.8.0-rc8-splice-fixw-proc+ #4
[12047.728354] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[12047.737107] trinity-c0 D ffff8804507dbd10 13552 3716 3713 0x00000084
[12047.744997] ffff8804507dbd10 ffff8804240e9368 ffff880400000000 ffffffff81c0d540
[12047.753300] ffff88044c430000 ffff8804507dc000 ffff8804240e9350 ffff8804507dbd40
[12047.761598] ffff8804240e9368 ffff8804240e94d8 ffff8804507dbd28 ffffffff817cdaaf
[12047.769898] Call Trace:
[12047.772631] [<ffffffff817cdaaf>] schedule+0x3f/0xa0
[12047.778174] [<ffffffff817d24b7>] rwsem_down_read_failed+0x107/0x190
[12047.785303] [<ffffffffa028ccca>] ? xfs_file_fsync+0xea/0x2e0 [xfs]
[12047.792309] [<ffffffff813e2788>] call_rwsem_down_read_failed+0x18/0x30
[12047.799695] [<ffffffff810f8b0b>] down_read_nested+0x5b/0x80
[12047.806029] [<ffffffffa029d5fa>] ? xfs_ilock+0xfa/0x260 [xfs]
[12047.812554] [<ffffffffa029d5fa>] xfs_ilock+0xfa/0x260 [xfs]
[12047.818887] [<ffffffffa028ccca>] xfs_file_fsync+0xea/0x2e0 [xfs]
[12047.825693] [<ffffffff812bdbbd>] vfs_fsync_range+0x3d/0xb0
[12047.831915] [<ffffffff812bdc8d>] do_fsync+0x3d/0x70
[12047.837455] [<ffffffff812bdf63>] SyS_fdatasync+0x13/0x20
[12047.843485] [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
[12047.849609] [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
[12047.856801] 1 lock held by trinity-c0/3716:
[12047.861470] #0: (&xfs_nondir_ilock_class){++++..}, at: [<ffffffffa029d5fa>] xfs_ilock+0xfa/0x260 [xfs]
[12047.872125] INFO: task trinity-c1:3717 blocked for more than 120 seconds.
[12047.879703] Not tainted 4.8.0-rc8-splice-fixw-proc+ #4
[12047.886011] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[12047.894749] trinity-c1 D ffff8804507ffd10 13568 3717 3713 0x00000084
[12047.902645] ffff8804507ffd10 ffff8804240e9368 ffff880400000000 ffff88046c9da000
[12047.910941] ffff88044c434000 ffff880450800000 ffff8804240e9350 ffff8804507ffd40
[12047.919240] ffff8804240e9368 ffff8804240e94d8 ffff8804507ffd28 ffffffff817cdaaf
[12047.927542] Call Trace:
[12047.930284] [<ffffffff817cdaaf>] schedule+0x3f/0xa0
[12047.935826] [<ffffffff817d24b7>] rwsem_down_read_failed+0x107/0x190
[12047.942933] [<ffffffffa028ccca>] ? xfs_file_fsync+0xea/0x2e0 [xfs]
[12047.949930] [<ffffffff813e2788>] call_rwsem_down_read_failed+0x18/0x30
[12047.957315] [<ffffffff810f8b0b>] down_read_nested+0x5b/0x80
[12047.963647] [<ffffffffa029d5fa>] ? xfs_ilock+0xfa/0x260 [xfs]
[12047.970171] [<ffffffffa029d5fa>] xfs_ilock+0xfa/0x260 [xfs]
[12047.976506] [<ffffffffa028ccca>] xfs_file_fsync+0xea/0x2e0 [xfs]
[12047.983310] [<ffffffff812bdbbd>] vfs_fsync_range+0x3d/0xb0
[12047.989529] [<ffffffff812bdc8d>] do_fsync+0x3d/0x70
[12047.995070] [<ffffffff812bdf63>] SyS_fdatasync+0x13/0x20
[12048.001096] [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
[12048.007217] [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
[12048.014407] 1 lock held by trinity-c1/3717:
[12048.019085] #0: (&xfs_nondir_ilock_class){++++..}, at: [<ffffffffa029d5fa>] xfs_ilock+0xfa/0x260 [xfs]
[12048.029742] INFO: task trinity-c2:3718 blocked for more than 120 seconds.
[12048.037310] Not tainted 4.8.0-rc8-splice-fixw-proc+ #4
[12048.043626] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[12048.052365] trinity-c2 D ffff8804586c7df8 13504 3718 3713 0x00000084
[12048.060261] ffff8804586c7df8 0000000000000006 0000000000000000 ffff88046c9dc000
[12048.068565] ffff88044c436000 ffff8804586c8000 ffff88044ec7e6f8 ffff88044c436000
[12048.076862] 0000000000000246 00000000ffffffff ffff8804586c7e10 ffffffff817cdaaf
[12048.085163] Call Trace:
[12048.087893] [<ffffffff817cdaaf>] schedule+0x3f/0xa0
[12048.093434] [<ffffffff817cdf18>] schedule_preempt_disabled+0x18/0x30
[12048.100627] [<ffffffff817cf4df>] mutex_lock_nested+0x19f/0x450
[12048.107237] [<ffffffff812a5313>] ? __fdget_pos+0x43/0x50
[12048.113262] [<ffffffff812a5313>] __fdget_pos+0x43/0x50
[12048.119094] [<ffffffff81297f53>] SyS_getdents+0x83/0x140
[12048.125120] [<ffffffff81297cd0>] ? fillonedir+0x100/0x100
[12048.131243] [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
[12048.137357] [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
[12048.144546] 1 lock held by trinity-c2/3718:
[12048.149214] #0: (&f->f_pos_lock){+.+.+.}, at: [<ffffffff812a5313>] __fdget_pos+0x43/0x50
[12048.158495] INFO: task trinity-c3:3719 blocked for more than 120 seconds.
[12048.166071] Not tainted 4.8.0-rc8-splice-fixw-proc+ #4
[12048.172388] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[12048.181120] trinity-c3 D ffff880450707c60 13552 3719 3713 0x00000084
[12048.189013] ffff880450707c60 ffffffff00000000 ffff880400000000 ffff88046ca10000
[12048.197313] ffff88044c432000 ffff880450708000 ffff8804240e9658 ffff8804240e9640
[12048.205612] ffffffff00000000 ffff88044c432000 ffff880450707c78 ffffffff817cdaaf
[12048.213912] Call Trace:
[12048.216643] [<ffffffff817cdaaf>] schedule+0x3f/0xa0
[12048.222183] [<ffffffff817d2782>] rwsem_down_write_failed+0x242/0x4b0
[12048.229374] [<ffffffff817d25ac>] ? rwsem_down_write_failed+0x6c/0x4b0
[12048.236662] [<ffffffff813e27b7>] call_rwsem_down_write_failed+0x17/0x30
[12048.244144] [<ffffffff817d1bff>] down_write+0x5f/0x80
[12048.249881] [<ffffffff812ad021>] ? vfs_removexattr+0x61/0x120
[12048.256391] [<ffffffff812ad021>] vfs_removexattr+0x61/0x120
[12048.262709] [<ffffffff812ad135>] removexattr+0x55/0x80
[12048.268533] [<ffffffff81402ff3>] ? __this_cpu_preempt_check+0x13/0x20
[12048.275811] [<ffffffff810f8eae>] ? update_fast_ctr+0x4e/0x70
[12048.282225] [<ffffffff810f8f57>] ? percpu_down_read+0x57/0x90
[12048.288728] [<ffffffff81284be1>] ? __sb_start_write+0xd1/0xf0
[12048.295230] [<ffffffff810cc367>] ? preempt_count_add+0x47/0xc0
[12048.301829] [<ffffffff812a665f>] ? mnt_clone_write+0x3f/0x70
[12048.308242] [<ffffffff812a8588>] ? __mnt_want_write_file+0x18/0x30
[12048.315238] [<ffffffff812a85d0>] ? mnt_want_write_file+0x30/0x60
[12048.322039] [<ffffffff812ae303>] SyS_fremovexattr+0x83/0xb0
[12048.328356] [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
[12048.334478] [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
[12048.341679] 2 locks held by trinity-c3/3719:
[12048.346454] #0: (sb_writers#8){.+.+.+}, at: [<ffffffff81284be1>] __sb_start_write+0xd1/0xf0
[12048.356042] #1: (&sb->s_type->i_mutex_key#14){+.+.+.}, at: [<ffffffff812ad021>] vfs_removexattr+0x61/0x120
[12048.367079] INFO: task trinity-c4:3720 blocked for more than 120 seconds.
[12048.374655] Not tainted 4.8.0-rc8-splice-fixw-proc+ #4
[12048.380972] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[12048.389712] trinity-c4 D ffff88045072be08 13536 3720 3713 0x00000084
[12048.397606] ffff88045072be08 0000000000000006 0000000000000000 ffff88046c9fe000
[12048.405902] ffff880450720000 ffff88045072c000 ffff88044ec7e6f8 ffff880450720000
[12048.414205] 0000000000000246 00000000ffffffff ffff88045072be20 ffffffff817cdaaf
[12048.422505] Call Trace:
[12048.425235] [<ffffffff817cdaaf>] schedule+0x3f/0xa0
[12048.430767] [<ffffffff817cdf18>] schedule_preempt_disabled+0x18/0x30
[12048.437957] [<ffffffff817cf4df>] mutex_lock_nested+0x19f/0x450
[12048.444565] [<ffffffff812a5313>] ? __fdget_pos+0x43/0x50
[12048.450591] [<ffffffff8117729f>] ? __audit_syscall_entry+0xaf/0x100
[12048.457675] [<ffffffff812a5313>] __fdget_pos+0x43/0x50
[12048.463508] [<ffffffff81298091>] SyS_getdents64+0x81/0x130
[12048.469720] [<ffffffff81297a80>] ? iterate_dir+0x190/0x190
[12048.475939] [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
[12048.482063] [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
[12048.489243] 1 lock held by trinity-c4/3720:
[12048.493913] #0: (&f->f_pos_lock){+.+.+.}, at: [<ffffffff812a5313>] __fdget_pos+0x43/0x50
[12048.503182] INFO: task trinity-c5:3721 blocked for more than 120 seconds.
[12048.510757] Not tainted 4.8.0-rc8-splice-fixw-proc+ #4
[12048.517071] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[12048.525812] trinity-c5 D ffff8804510a7e08 13552 3721 3713 0x00000084
[12048.533706] ffff8804510a7e08 0000000000000006 0000000000000000 ffff88046c9fa000
[12048.542007] ffff880450722000 ffff8804510a8000 ffff88044ec7e6f8 ffff880450722000
[12048.550310] 0000000000000246 00000000ffffffff ffff8804510a7e20 ffffffff817cdaaf
[12048.558610] Call Trace:
[12048.561339] [<ffffffff817cdaaf>] schedule+0x3f/0xa0
[12048.566879] [<ffffffff817cdf18>] schedule_preempt_disabled+0x18/0x30
[12048.574070] [<ffffffff817cf4df>] mutex_lock_nested+0x19f/0x450
[12048.580677] [<ffffffff812a5313>] ? __fdget_pos+0x43/0x50
[12048.586703] [<ffffffff8117729f>] ? __audit_syscall_entry+0xaf/0x100
[12048.593796] [<ffffffff812a5313>] __fdget_pos+0x43/0x50
[12048.599629] [<ffffffff81298091>] SyS_getdents64+0x81/0x130
[12048.605849] [<ffffffff81297a80>] ? iterate_dir+0x190/0x190
[12048.612069] [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
[12048.618191] [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
[12048.625382] 1 lock held by trinity-c5/3721:
[12048.630049] #0: (&f->f_pos_lock){+.+.+.}, at: [<ffffffff812a5313>] __fdget_pos+0x43/0x50
[12048.639329] INFO: task trinity-c6:3722 blocked for more than 120 seconds.
[12048.646903] Not tainted 4.8.0-rc8-splice-fixw-proc+ #4
[12048.653219] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[12048.661958] trinity-c6 D ffff88044f0ebc50 12224 3722 3713 0x00000084
[12048.669849] ffff88044f0ebc50 ffff8804240e9368 ffff880400000000 ffff88046c9fc000
[12048.678149] ffff880450724000 ffff88044f0ec000 ffff8804240e9350 ffff88044f0ebc80
[12048.686448] ffff8804240e9368 ffff8804240e92c0 ffff88044f0ebc68 ffffffff817cdaaf
[12048.694750] Call Trace:
[12048.697478] [<ffffffff817cdaaf>] schedule+0x3f/0xa0
[12048.703018] [<ffffffff817d24b7>] rwsem_down_read_failed+0x107/0x190
[12048.710126] [<ffffffffa029d7d4>] ? xfs_ilock_attr_map_shared+0x34/0x40 [xfs]
[12048.718095] [<ffffffff813e2788>] call_rwsem_down_read_failed+0x18/0x30
[12048.725479] [<ffffffff810f8b0b>] down_read_nested+0x5b/0x80
[12048.731800] [<ffffffffa029d5fa>] ? xfs_ilock+0xfa/0x260 [xfs]
[12048.738337] [<ffffffffa029d5fa>] xfs_ilock+0xfa/0x260 [xfs]
[12048.744669] [<ffffffffa029d7d4>] xfs_ilock_attr_map_shared+0x34/0x40 [xfs]
[12048.752457] [<ffffffffa0280801>] xfs_attr_list_int+0x71/0x690 [xfs]
[12048.759555] [<ffffffff810cba89>] ? __might_sleep+0x49/0x80
[12048.765792] [<ffffffffa02abf2a>] xfs_vn_listxattr+0x7a/0xb0 [xfs]
[12048.772707] [<ffffffffa02abcc0>] ? __xfs_xattr_put_listent+0xa0/0xa0 [xfs]
[12048.780480] [<ffffffff812ad582>] vfs_listxattr+0x42/0x70
[12048.786517] [<ffffffff812ad68e>] listxattr+0xde/0xf0
[12048.792156] [<ffffffff812ae1f6>] SyS_flistxattr+0x56/0xa0
[12048.798271] [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
[12048.804404] [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
[12048.811595] 1 lock held by trinity-c6/3722:
[12048.816263] #0: (&xfs_nondir_ilock_class){++++..}, at: [<ffffffffa029d5fa>] xfs_ilock+0xfa/0x260 [xfs]
[12048.826935] INFO: task trinity-c7:3723 blocked for more than 120 seconds.
[12048.834516] Not tainted 4.8.0-rc8-splice-fixw-proc+ #4
[12048.840832] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[12048.849572] trinity-c7 D ffff88044fc23c50 13552 3723 3713 0x00000084
[12048.857469] ffff88044fc23c50 ffff8804240e9368 ffff880400000000 ffff88046c9f8000
[12048.865768] ffff880450726000 ffff88044fc24000 ffff8804240e9350 ffff88044fc23c80
[12048.874067] ffff8804240e9368 ffff8804240e92c0 ffff88044fc23c68 ffffffff817cdaaf
[12048.882370] Call Trace:
[12048.885100] [<ffffffff817cdaaf>] schedule+0x3f/0xa0
[12048.890634] [<ffffffff817d24b7>] rwsem_down_read_failed+0x107/0x190
[12048.897741] [<ffffffffa029d7d4>] ? xfs_ilock_attr_map_shared+0x34/0x40 [xfs]
[12048.905707] [<ffffffff813e2788>] call_rwsem_down_read_failed+0x18/0x30
[12048.913081] [<ffffffff810f8b0b>] down_read_nested+0x5b/0x80
[12048.919412] [<ffffffffa029d5fa>] ? xfs_ilock+0xfa/0x260 [xfs]
[12048.925937] [<ffffffffa029d5fa>] xfs_ilock+0xfa/0x260 [xfs]
[12048.932267] [<ffffffffa029d7d4>] xfs_ilock_attr_map_shared+0x34/0x40 [xfs]
[12048.940053] [<ffffffffa0280801>] xfs_attr_list_int+0x71/0x690 [xfs]
[12048.947146] [<ffffffff810cba89>] ? __might_sleep+0x49/0x80
[12048.953374] [<ffffffffa02abf2a>] xfs_vn_listxattr+0x7a/0xb0 [xfs]
[12048.960288] [<ffffffffa02abcc0>] ? __xfs_xattr_put_listent+0xa0/0xa0 [xfs]
[12048.968060] [<ffffffff812ad582>] vfs_listxattr+0x42/0x70
[12048.974088] [<ffffffff812ad602>] listxattr+0x52/0xf0
[12048.979726] [<ffffffff812ae1f6>] SyS_flistxattr+0x56/0xa0
[12048.985849] [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
[12048.991973] [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
[12048.999162] 1 lock held by trinity-c7/3723:
[12049.003831] #0: (&xfs_nondir_ilock_class){++++..}, at: [<ffffffffa029d5fa>] xfs_ilock+0xfa/0x260 [xfs]
[12049.014481] INFO: task trinity-c8:3724 blocked for more than 120 seconds.
[12049.022072] Not tainted 4.8.0-rc8-splice-fixw-proc+ #4
[12049.028389] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[12049.037130] trinity-c8 D ffff88044fc3fc60 13504 3724 3713 0x00000084
[12049.045023] ffff88044fc3fc60 ffffffff00000000 ffff880400000000 ffff88046ca14000
[12049.053324] ffff88044e540000 ffff88044fc40000 ffff8804240e9368 ffff8804240e9350
[12049.061623] ffffffff00000000 ffff88044e540000 ffff88044fc3fc78 ffffffff817cdaaf
[12049.069924] Call Trace:
[12049.072654] [<ffffffff817cdaaf>] schedule+0x3f/0xa0
[12049.078208] [<ffffffff817d2782>] rwsem_down_write_failed+0x242/0x4b0
[12049.085408] [<ffffffff817d25ac>] ? rwsem_down_write_failed+0x6c/0x4b0
[12049.092734] [<ffffffffa028d7cc>] ? xfs_update_prealloc_flags+0x6c/0x100 [xfs]
[12049.100798] [<ffffffff813e27b7>] call_rwsem_down_write_failed+0x17/0x30
[12049.108290] [<ffffffff810f8c15>] down_write_nested+0x65/0x80
[12049.114742] [<ffffffffa029d68e>] ? xfs_ilock+0x18e/0x260 [xfs]
[12049.121377] [<ffffffffa029d68e>] xfs_ilock+0x18e/0x260 [xfs]
[12049.127819] [<ffffffffa028d7cc>] xfs_update_prealloc_flags+0x6c/0x100 [xfs]
[12049.135714] [<ffffffffa028da8e>] xfs_file_fallocate+0x22e/0x360 [xfs]
[12049.143004] [<ffffffff810f8eae>] ? update_fast_ctr+0x4e/0x70
[12049.149435] [<ffffffff810f8f57>] ? percpu_down_read+0x57/0x90
[12049.155958] [<ffffffff81284be1>] ? __sb_start_write+0xd1/0xf0
[12049.162492] [<ffffffff81284be1>] ? __sb_start_write+0xd1/0xf0
[12049.169016] [<ffffffff8127e000>] vfs_fallocate+0x140/0x230
[12049.175249] [<ffffffff8127eee4>] SyS_fallocate+0x44/0x70
[12049.181288] [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
[12049.187423] [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
[12049.194667] 5 locks held by trinity-c8/3724:
[12049.199429] #0: (sb_writers#8){.+.+.+}, at: [<ffffffff81284be1>] __sb_start_write+0xd1/0xf0
[12049.209024] #1: (&(&ip->i_iolock)->mr_lock){++++++}, at: [<ffffffffa029d654>] xfs_ilock+0x154/0x260 [xfs]
[12049.219990] #2: (&(&ip->i_mmaplock)->mr_lock){+++++.}, at: [<ffffffffa029d674>] xfs_ilock+0x174/0x260 [xfs]
[12049.231128] #3: (sb_internal){.+.+.+}, at: [<ffffffff81284b8b>] __sb_start_write+0x7b/0xf0
[12049.240620] #4: (&xfs_nondir_ilock_class){++++..}, at: [<ffffffffa029d68e>] xfs_ilock+0x18e/0x260 [xfs]
[12049.251383] INFO: task trinity-c9:3725 blocked for more than 120 seconds.
[12049.258959] Not tainted 4.8.0-rc8-splice-fixw-proc+ #4
[12049.265287] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[12049.274027] trinity-c9 D ffff88044f043d30 13552 3725 3713 0x00000084
[12049.281922] ffff88044f043d30 ffffffff00000000 ffff880400000000 ffff88046ca14000
[12049.290238] ffff88044e542000 ffff88044f044000 ffff8804240e9658 ffff8804240e9640
[12049.298539] ffffffff00000000 ffff88044e542000 ffff88044f043d48 ffffffff817cdaaf
[12049.306840] Call Trace:
[12049.309569] [<ffffffff817cdaaf>] schedule+0x3f/0xa0
[12049.315122] [<ffffffff817d2782>] rwsem_down_write_failed+0x242/0x4b0
[12049.322327] [<ffffffff817d25ac>] ? rwsem_down_write_failed+0x6c/0x4b0
[12049.329625] [<ffffffff813e27b7>] call_rwsem_down_write_failed+0x17/0x30
[12049.337118] [<ffffffff817d1bff>] down_write+0x5f/0x80
[12049.342864] [<ffffffff8127e413>] ? chmod_common+0x63/0x150
[12049.349096] [<ffffffff8127e413>] chmod_common+0x63/0x150
[12049.355131] [<ffffffff8117729f>] ? __audit_syscall_entry+0xaf/0x100
[12049.362236] [<ffffffff810035cc>] ? syscall_trace_enter+0x1dc/0x390
[12049.369243] [<ffffffff8127f5f2>] SyS_fchmod+0x52/0x80
[12049.374988] [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
[12049.381124] [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
[12049.388324] 2 locks held by trinity-c9/3725:
[12049.393100] #0: (sb_writers#8){.+.+.+}, at: [<ffffffff81284be1>] __sb_start_write+0xd1/0xf0
[12049.402705] #1: (&sb->s_type->i_mutex_key#14){+.+.+.}, at: [<ffffffff8127e413>] chmod_common+0x63/0x150
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