https://bugzilla.kernel.org/show_bug.cgi?id=154041
Bug ID: 154041
Summary: DOM Worker/4206 is trying to acquire lock
xfs_file_buffered_aio_write but task is already
holding lock
Product: File System
Version: 2.5
Kernel Version: 4.7.2-200.fc24.x86_64+debug
Hardware: All
OS: Linux
Tree: Fedora
Status: NEW
Severity: normal
Priority: P1
Component: XFS
Assignee: xfs-masters@xxxxxxxxxxx
Reporter: mikhail.v.gavrilov@xxxxxxxxx
Regression: No
Created attachment 230441
--> https://bugzilla.kernel.org/attachment.cgi?id=230441&action=edit
dmesg
[38053.200301] ======================================================
[38053.200302] [ INFO: possible circular locking dependency detected ]
[38053.200304] 4.7.2-200.fc24.x86_64+debug #1 Not tainted
[38053.200305] -------------------------------------------------------
[38053.200306] DOM Worker/4206 is trying to acquire lock:
[38053.200307] (&sb->s_type->i_mutex_key#20){+.+.+.}, at: [<ffffffffc094159b>]
xfs_file_buffered_aio_write+0x6b/0x350 [xfs]
[38053.200362]
but task is already holding lock:
[38053.200363] (&pipe->mutex/1){+.+.+.}, at: [<ffffffff8129e89e>]
pipe_lock+0x1e/0x20
[38053.200368]
which lock already depends on the new lock.
[38053.200369]
the existing dependency chain (in reverse order) is:
[38053.200370]
-> #2 (&pipe->mutex/1){+.+.+.}:
[38053.200373] [<ffffffff8110d1ee>] lock_acquire+0xfe/0x1f0
[38053.200376] [<ffffffff818d9576>] mutex_lock_nested+0x86/0x3f0
[38053.200380] [<ffffffff8129e89e>] pipe_lock+0x1e/0x20
[38053.200381] [<ffffffff812cf9d0>] splice_to_pipe+0x40/0x260
[38053.200384] [<ffffffff812d13a3>]
__generic_file_splice_read+0x633/0x710
[38053.200386] [<ffffffff812d1855>] generic_file_splice_read+0x45/0x90
[38053.200387] [<ffffffffc093ed2c>] xfs_file_splice_read+0x11c/0x2a0
[xfs]
[38053.200407] [<ffffffff812cfd49>] do_splice_to+0x79/0x90
[38053.200408] [<ffffffff812d26e4>] SyS_splice+0x7f4/0x830
[38053.200410] [<ffffffff818dd13c>] entry_SYSCALL_64_fastpath+0x1f/0xbd
[38053.200413]
-> #1 (&(&ip->i_iolock)->mr_lock#2){++++++}:
[38053.200415] [<ffffffff8110d1ee>] lock_acquire+0xfe/0x1f0
[38053.200417] [<ffffffff8110656e>] down_write_nested+0x5e/0xc0
[38053.200421] [<ffffffffc094fcb5>] xfs_ilock+0x215/0x2c0 [xfs]
[38053.200439] [<ffffffffc09415a8>]
xfs_file_buffered_aio_write+0x78/0x350 [xfs]
[38053.200456] [<ffffffffc094199e>] xfs_file_write_iter+0x11e/0x130
[xfs]
[38053.200471] [<ffffffff81295218>] __vfs_write+0xe8/0x160
[38053.200473] [<ffffffff81295af8>] vfs_write+0xb8/0x1a0
[38053.200475] [<ffffffff81296fa8>] SyS_write+0x58/0xc0
[38053.200476] [<ffffffff818dd13c>] entry_SYSCALL_64_fastpath+0x1f/0xbd
[38053.200478]
-> #0 (&sb->s_type->i_mutex_key#20){+.+.+.}:
[38053.200481] [<ffffffff8110cd45>] __lock_acquire+0x11d5/0x1210
[38053.200483] [<ffffffff8110d1ee>] lock_acquire+0xfe/0x1f0
[38053.200484] [<ffffffff818da81a>] down_write+0x5a/0xc0
[38053.200486] [<ffffffffc094159b>]
xfs_file_buffered_aio_write+0x6b/0x350 [xfs]
[38053.200502] [<ffffffffc094199e>] xfs_file_write_iter+0x11e/0x130
[xfs]
[38053.200517] [<ffffffff81294f75>] vfs_iter_write+0x95/0x110
[38053.200518] [<ffffffff812d08d0>] iter_file_splice_write+0x270/0x3c0
[38053.200520] [<ffffffff812d2259>] SyS_splice+0x369/0x830
[38053.200522] [<ffffffff818dd13c>] entry_SYSCALL_64_fastpath+0x1f/0xbd
[38053.200524]
other info that might help us debug this:
[38053.200525] Chain exists of:
&sb->s_type->i_mutex_key#20 --> &(&ip->i_iolock)->mr_lock#2
--> &pipe->mutex/1
[38053.200530] Possible unsafe locking scenario:
[38053.200531] CPU0 CPU1
[38053.200532] ---- ----
[38053.200532] lock(&pipe->mutex/1);
[38053.200534]
lock(&(&ip->i_iolock)->mr_lock#2);
[38053.200536] lock(&pipe->mutex/1);
[38053.200538] lock(&sb->s_type->i_mutex_key#20);
[38053.200540]
*** DEADLOCK ***
[38053.200541] 2 locks held by DOM Worker/4206:
[38053.200542] #0: (sb_writers#16){.+.+.+}, at: [<ffffffff81299024>]
__sb_start_write+0xb4/0xf0
[38053.200547] #1: (&pipe->mutex/1){+.+.+.}, at: [<ffffffff8129e89e>]
pipe_lock+0x1e/0x20
[38053.200550]
stack backtrace:
[38053.200552] CPU: 7 PID: 4206 Comm: DOM Worker Not tainted
4.7.2-200.fc24.x86_64+debug #1
[38053.200553] Hardware name: Gigabyte Technology Co., Ltd. Z87M-D3H/Z87M-D3H,
BIOS F11 08/12/2014
[38053.200555] 0000000000000086 00000000c9c3e5d4 ffff880600983b30
ffffffff81457a05
[38053.200558] ffffffff82b1c1e0 ffffffff82b18f80 ffff880600983b70
ffffffff8110a2de
[38053.200560] 000000000094c000 ffff88060094c998 ffff88060094c000
000000155c5d062b
[38053.200562] Call Trace:
[38053.200565] [<ffffffff81457a05>] dump_stack+0x86/0xc1
[38053.200567] [<ffffffff8110a2de>] print_circular_bug+0x1be/0x210
[38053.200569] [<ffffffff8110cd45>] __lock_acquire+0x11d5/0x1210
[38053.200571] [<ffffffff8110d1ee>] lock_acquire+0xfe/0x1f0
[38053.200587] [<ffffffffc094159b>] ? xfs_file_buffered_aio_write+0x6b/0x350
[xfs]
[38053.200590] [<ffffffff818da81a>] down_write+0x5a/0xc0
[38053.200604] [<ffffffffc094159b>] ? xfs_file_buffered_aio_write+0x6b/0x350
[xfs]
[38053.200619] [<ffffffffc094159b>] xfs_file_buffered_aio_write+0x6b/0x350
[xfs]
[38053.200621] [<ffffffff818d9777>] ? mutex_lock_nested+0x287/0x3f0
[38053.200623] [<ffffffff8110b81d>] ? trace_hardirqs_on+0xd/0x10
[38053.200637] [<ffffffffc094199e>] xfs_file_write_iter+0x11e/0x130 [xfs]
[38053.200639] [<ffffffff81294f75>] vfs_iter_write+0x95/0x110
[38053.200641] [<ffffffff812d08d0>] iter_file_splice_write+0x270/0x3c0
[38053.200643] [<ffffffff812d2259>] SyS_splice+0x369/0x830
[38053.200644] [<ffffffff8110b755>] ? trace_hardirqs_on_caller+0xf5/0x1b0
[38053.200646] [<ffffffff818dd13c>] entry_SYSCALL_64_fastpath+0x1f/0xbd
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