Is it known?
[ 427.145528] run fstests generic/027 at 2016-03-31 22:48:31
[ 427.583892] XFS (nvme0n1p2): Mounting V5 Filesystem
[ 427.600853] XFS (nvme0n1p2): Ending clean mount
[ 428.544208]
[ 428.546684] ======================================================
[ 428.553922] [ INFO: possible circular locking dependency detected ]
[ 428.561162] 4.5.0+ #175 Tainted: G E
[ 428.566909] -------------------------------------------------------
[ 428.574207] xfs_io/4733 is trying to acquire lock:
[ 428.580045] (&s->s_sync_lock){+.+.+.}, at: [<ffffffff811f8c32>]
sync_inodes_sb+0xc2/0x1d0
[ 428.589375]
[ 428.589375] but task is already holding lock:
[ 428.597206] (sb_internal#2){.+.+.+}, at: [<ffffffff811cf386>]
__sb_start_write+0x76/0xe0
[ 428.606601]
[ 428.606601] which lock already depends on the new lock.
[ 428.606601]
[ 428.617908]
[ 428.617908] the existing dependency chain (in reverse order) is:
[ 428.627562]
[ 428.627562] -> #1 (sb_internal#2){.+.+.+}:
[ 428.633501] [<ffffffff810bb760>] lock_acquire+0x90/0xf0
[ 428.640128] [<ffffffff810b5d95>] percpu_down_read+0x45/0x90
[ 428.647111] [<ffffffff811cf3dc>] __sb_start_write+0xcc/0xe0
[ 428.654103] [<ffffffffc08d032f>] xfs_trans_alloc+0x1f/0x40 [xfs]
[ 428.661541] [<ffffffffc08c703e>] xfs_inactive_truncate+0x1e/0xf0 [xfs]
[ 428.669504] [<ffffffffc08c7d3e>] xfs_inactive+0xee/0x110 [xfs]
[ 428.676764] [<ffffffffc08ccc54>] xfs_fs_evict_inode+0x94/0xa0 [xfs]
[ 428.684463] [<ffffffff811e96a3>] evict+0xb3/0x190
[ 428.690586] [<ffffffff811e9ff3>] iput+0x133/0x1a0
[ 428.696708] [<ffffffff811f8cba>] sync_inodes_sb+0x14a/0x1d0
[ 428.703701] [<ffffffff811fee50>] sync_inodes_one_sb+0x10/0x20
[ 428.710894] [<ffffffff811cfdb9>] iterate_supers+0xa9/0x100
[ 428.717803] [<ffffffff811ff140>] sys_sync+0x30/0x90
[ 428.724091] [<ffffffff81770976>] entry_SYSCALL_64_fastpath+0x16/0x7a
[ 428.731867]
[ 428.731867] -> #0 (&s->s_sync_lock){+.+.+.}:
[ 428.737895] [<ffffffff810bb02e>] __lock_acquire+0x15be/0x1c60
[ 428.745072] [<ffffffff810bb760>] lock_acquire+0x90/0xf0
[ 428.751717] [<ffffffff8176d52f>] mutex_lock_nested+0x5f/0x400
[ 428.758918] [<ffffffff811f8c32>] sync_inodes_sb+0xc2/0x1d0
[ 428.765834] [<ffffffffc08cea93>] xfs_flush_inodes+0x23/0x30 [xfs]
[ 428.773374] [<ffffffffc08c6bb0>] xfs_create+0x530/0x5c0 [xfs]
[ 428.780556] [<ffffffffc08c32ce>] xfs_generic_create+0xbe/0x290 [xfs]
[ 428.788358] [<ffffffffc08c34cf>] xfs_vn_mknod+0xf/0x20 [xfs]
[ 428.795455] [<ffffffffc08c350e>] xfs_vn_create+0xe/0x10 [xfs]
[ 428.802658] [<ffffffff811d7c8d>] vfs_create+0xbd/0x120
[ 428.809224] [<ffffffff811db8b0>] path_openat+0x1070/0x1490
[ 428.816137] [<ffffffff811dcce9>] do_filp_open+0x79/0xd0
[ 428.822795] [<ffffffff811cb160>] do_sys_open+0x110/0x1f0
[ 428.829539] [<ffffffff811cb259>] SyS_open+0x19/0x20
[ 428.835840] [<ffffffff81770976>] entry_SYSCALL_64_fastpath+0x16/0x7a
[ 428.843646]
[ 428.843646] other info that might help us debug this:
[ 428.843646]
[ 428.854018] Possible unsafe locking scenario:
[ 428.854018]
[ 428.861503] CPU0 CPU1
[ 428.866845] ---- ----
[ 428.872162] lock(sb_internal#2);
[ 428.876384] lock(&s->s_sync_lock);
[ 428.883307] lock(sb_internal#2);
[ 428.890064] lock(&s->s_sync_lock);
[ 428.894470]
[ 428.894470] *** DEADLOCK ***
[ 428.894470]
[ 428.902637] 4 locks held by xfs_io/4733:
[ 428.907317] #0: (sb_writers#14){.+.+.+}, at: [<ffffffff811cf3dc>]
__sb_start_write+0xcc/0xe0
[ 428.916833] #1: (&type->i_mutex_dir_key#6){+.+.+.}, at:
[<ffffffff811daceb>] path_openat+0x4ab/0x1490
[ 428.927146] #2: (sb_internal#2){.+.+.+}, at: [<ffffffff811cf386>]
__sb_start_write+0x76/0xe0
[ 428.936680] #3: (&type->s_umount_key#37){++++++}, at:
[<ffffffffc08cea87>] xfs_flush_inodes+0x17/0x30 [xfs]
[ 428.947539]
[ 428.947539] stack backtrace:
[ 428.953478] CPU: 4 PID: 4733 Comm: xfs_io Tainted: G E
4.5.0+ #175
[ 428.961642] Hardware name: Dell Inc. OptiPlex 7010/0773VG, BIOS A12
01/10/2013
[ 428.969724] 0000000000000000 ffff8800bd773908 ffffffff813816fc
ffffffff825d75b0
[ 428.978044] ffffffff825d75b0 ffff8800bd773948 ffffffff81141149
ffff8800bd773990
[ 428.986352] ffff8800bd9a4980 ffff8800bd9a5188 ffff8800bd9a5160
0000000000000003
[ 428.994655] Call Trace:
[ 428.997893] [<ffffffff813816fc>] dump_stack+0x85/0xc9
[ 429.003838] [<ffffffff81141149>] print_circular_bug+0x1f9/0x207
[ 429.010647] [<ffffffff810bb02e>] __lock_acquire+0x15be/0x1c60
[ 429.017288] [<ffffffff810b341c>] ? finish_wait+0x5c/0x70
[ 429.023510] [<ffffffff810bb760>] lock_acquire+0x90/0xf0
[ 429.029631] [<ffffffff811f8c32>] ? sync_inodes_sb+0xc2/0x1d0
[ 429.036214] [<ffffffff8176d52f>] mutex_lock_nested+0x5f/0x400
[ 429.042850] [<ffffffff811f8c32>] ? sync_inodes_sb+0xc2/0x1d0
[ 429.049406] [<ffffffff811f75d5>] ? wb_wait_for_completion+0x75/0x80
[ 429.056589] [<ffffffff811f8c32>] sync_inodes_sb+0xc2/0x1d0
[ 429.062970] [<ffffffffc08cea93>] xfs_flush_inodes+0x23/0x30 [xfs]
[ 429.069967] [<ffffffffc08c6bb0>] xfs_create+0x530/0x5c0 [xfs]
[ 429.076612] [<ffffffff811e39a7>] ? __d_instantiate+0x87/0xf0
[ 429.083160] [<ffffffff8122ccde>] ? posix_acl_create+0xfe/0x150
[ 429.089892] [<ffffffffc08c32ce>] xfs_generic_create+0xbe/0x290 [xfs]
[ 429.097146] [<ffffffff81329a7b>] ? common_perm+0x1b/0x70
[ 429.103369] [<ffffffffc08c34cf>] xfs_vn_mknod+0xf/0x20 [xfs]
[ 429.109927] [<ffffffffc08c350e>] xfs_vn_create+0xe/0x10 [xfs]
[ 429.116569] [<ffffffff811d7c8d>] vfs_create+0xbd/0x120
[ 429.122603] [<ffffffff811db8b0>] path_openat+0x1070/0x1490
[ 429.128984] [<ffffffff811dcce9>] do_filp_open+0x79/0xd0
[ 429.135109] [<ffffffff8176ffa2>] ? _raw_spin_unlock+0x22/0x40
[ 429.141756] [<ffffffff811ec358>] ? __alloc_fd+0xf8/0x200
[ 429.147971] [<ffffffff811cb160>] do_sys_open+0x110/0x1f0
[ 429.154170] [<ffffffff811cb259>] SyS_open+0x19/0x20
[ 429.159930] [<ffffffff81770976>] entry_SYSCALL_64_fastpath+0x16/0x7a
[ 440.468568] XFS (nvme0n1p2): Unmounting Filesystem
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