[ 9838.099809] run fstests shared/298 at 2017-09-19 21:46:22

[ 9840.095739] ======================================================
[ 9840.096382] WARNING: possible circular locking dependency detected
[ 9840.097011] 4.14.0-rc1-fixes #1 Tainted: G        W
[ 9840.097543] ------------------------------------------------------
[ 9840.098175] loop0/31693 is trying to acquire lock:
[ 9840.098675]  (&(&ip->i_mmaplock)->mr_lock){++++}, at: [<ffffffffa00f1b0c>] xfs_ilock+0x23c/0x330 [xfs]
[ 9840.099662]
               but now in release context of a crosslock acquired at the following:
[ 9840.100560]  ((complete)&ret.event){+.+.}, at: [<ffffffff81326c1f>] submit_bio_wait+0x7f/0xb0
[ 9840.101425]
               which lock already depends on the new lock.

[ 9840.102241]
               the existing dependency chain (in reverse order) is:
[ 9840.102994]
               -> #2 ((complete)&ret.event){+.+.}:
[ 9840.106087]        lock_acquire+0xab/0x200
[ 9840.106524]        wait_for_completion_io+0x4e/0x1a0
[ 9840.107039]        submit_bio_wait+0x7f/0xb0
[ 9840.107510]        blkdev_issue_zeroout+0x71/0xa0
[ 9840.108052]        xfs_bmapi_convert_unwritten+0x11f/0x1d0 [xfs]
[ 9840.108691]        xfs_bmapi_write+0x374/0x11f0 [xfs]
[ 9840.109242]        xfs_iomap_write_direct+0x2ac/0x430 [xfs]
[ 9840.109848]        xfs_file_iomap_begin+0x20d/0xd50 [xfs]
[ 9840.110415]        iomap_apply+0x43/0xe0
[ 9840.110829]        dax_iomap_rw+0x89/0xf0
[ 9840.111278]        xfs_file_dax_write+0xcc/0x220 [xfs]
[ 9840.111836]        xfs_file_write_iter+0xf0/0x130 [xfs]
[ 9840.112389]        __vfs_write+0xd9/0x150
[ 9840.112811]        vfs_write+0xc8/0x1c0
[ 9840.113216]        SyS_write+0x45/0xa0
[ 9840.113616]        entry_SYSCALL_64_fastpath+0x1f/0xbe
[ 9840.114144]
               -> #1 (&xfs_nondir_ilock_class){++++}:
[ 9840.114781]        lock_acquire+0xab/0x200
[ 9840.115216]        down_write_nested+0x4a/0xb0
[ 9840.115711]        xfs_ilock+0x263/0x330 [xfs]
[ 9840.116215]        xfs_setattr_size+0x152/0x370 [xfs]
[ 9840.116768]        xfs_vn_setattr+0x6b/0x90 [xfs]
[ 9840.117266]        notify_change+0x27d/0x3f0
[ 9840.117710]        do_truncate+0x5b/0x90
[ 9840.118123]        path_openat+0x237/0xa90
[ 9840.118549]        do_filp_open+0x8a/0xf0
[ 9840.118967]        do_sys_open+0x11c/0x1f0
[ 9840.119394]        entry_SYSCALL_64_fastpath+0x1f/0xbe
[ 9840.119919]
               -> #0 (&(&ip->i_mmaplock)->mr_lock){++++}:
[ 9840.120592]        up_write+0x1c/0x40
[ 9840.121009]        xfs_iunlock+0x1d0/0x310 [xfs]
[ 9840.124014]        xfs_file_fallocate+0x8a/0x310 [xfs]
[ 9840.124563]        loop_queue_work+0xb7/0x8d0
[ 9840.125030]        kthread_worker_fn+0xb9/0x1f0
[ 9840.125502]
               other info that might help us debug this:

[ 9840.126307] Chain exists of:
                 &(&ip->i_mmaplock)->mr_lock --> &xfs_nondir_ilock_class --> (complete)&ret.event

[ 9840.127582]  Possible unsafe locking scenario by crosslock:

[ 9840.128301]        CPU0                    CPU1
[ 9840.128773]        ----                    ----
[ 9840.129246]   lock(&xfs_nondir_ilock_class);
[ 9840.129693]   lock((complete)&ret.event);
[ 9840.130117]                                lock(&(&ip->i_mmaplock)->mr_lock);
[ 9840.130840]                                unlock((complete)&ret.event);
[ 9840.131519]
                *** DEADLOCK ***

[ 9840.132129] 1 lock held by loop0/31693:
[ 9840.132532]  #0:  (&x->wait#16){-...}, at: [<ffffffff810d1858>] complete+0x18/0x60
[ 9840.133306]
               stack backtrace:
[ 9840.133759] CPU: 2 PID: 31693 Comm: loop0 Tainted: G        W       4.14.0-rc1-fixes #1
[ 9840.134543] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.10.2-1ubuntu1 04/01/2014
[ 9840.135459] Call Trace:
[ 9840.135738]  dump_stack+0x7c/0xbe
[ 9840.136103]  print_circular_bug+0x204/0x310
[ 9840.136542]  ? graph_unlock+0x70/0x70
[ 9840.136929]  check_prev_add+0x401/0x800
[ 9840.137335]  ? __lock_acquire+0x72a/0x1100
[ 9840.137761]  ? __lock_acquire+0x534/0x1100
[ 9840.138191]  ? lock_commit_crosslock+0x3e9/0x5c0
[ 9840.141152]  lock_commit_crosslock+0x3e9/0x5c0
[ 9840.141621]  complete+0x24/0x60
[ 9840.141958]  blk_update_request+0xc2/0x3e0
[ 9840.142392]  blk_mq_end_request+0x18/0x80
[ 9840.142816]  __blk_mq_complete_request+0x9f/0x170
[ 9840.143306]  loop_queue_work+0x51/0x8d0
[ 9840.143714]  ? kthread_worker_fn+0x96/0x1f0
[ 9840.144157]  kthread_worker_fn+0xb9/0x1f0
[ 9840.144581]  kthread+0x148/0x180
[ 9840.144929]  ? loop_get_status64+0x80/0x80
[ 9840.145359]  ? kthread_create_on_node+0x40/0x40
[ 9840.145831]  ret_from_fork+0x2a/0x40
[ 9840.253311] XFS (loop0): EXPERIMENTAL reverse mapping btree feature enabled. Use at your own risk!
[ 9840.254275] XFS (loop0): EXPERIMENTAL reflink feature enabled. Use at your own risk!
[ 9840.255357] XFS (loop0): Mounting V5 Filesystem
[ 9840.260389] XFS (loop0): Ending clean mount
[ 9842.547227] XFS (loop0): Unmounting Filesystem
[ 9856.898763] XFS (pmem3): Unmounting Filesystem
[ 9857.051614] XFS (pmem3): EXPERIMENTAL reverse mapping btree feature enabled. Use at your own risk!
[ 9857.052621] XFS (pmem3): EXPERIMENTAL reflink feature enabled. Use at your own risk!
[ 9857.053627] XFS (pmem3): Mounting V5 Filesystem
[ 9857.056204] XFS (pmem3): Ending clean mount