This may be old news, but:
[23405.556763] ======================================================
[23405.584315] [ INFO: possible circular locking dependency detected ]
[23405.611861] 3.6.0-rc2-ceph-00143-g995fc06 #1 Not tainted
[23405.638127] -------------------------------------------------------
[23405.638129] fill2/7976 is trying to acquire lock:
[23405.638139] ((&mp->m_flush_work)){+.+.+.}, at: [<ffffffff81072060>] wait_on_work+0x0/0x160
[23405.638140]
[23405.638140] but task is already holding lock:
[23405.638174] (sb_internal#2){.+.+.+}, at: [<ffffffffa03afe5d>] xfs_trans_alloc+0x2d/0x50 [xfs]
[23405.638175]
[23405.638175] which lock already depends on the new lock.
[23405.638175]
[23405.638175]
[23405.638175] the existing dependency chain (in reverse order) is:
[23405.638179]
[23405.638179] -> #1 (sb_internal#2){.+.+.+}:
[23405.638183] [<ffffffff810b2c82>] lock_acquire+0xa2/0x140
[23405.638186] [<ffffffff816318eb>] mutex_lock_nested+0x4b/0x320
[23405.638210] [<ffffffffa03aee89>] xfs_icsb_modify_counters+0x119/0x1b0 [xfs]
[23405.638228] [<ffffffffa0363346>] xfs_reserve_blocks+0x96/0x170 [xfs]
[23405.638252] [<ffffffffa03aec75>] xfs_unmountfs+0x95/0x190 [xfs]
[23405.638268] [<ffffffffa036cd95>] xfs_fs_put_super+0x25/0x70 [xfs]
[23405.638273] [<ffffffff8117de12>] generic_shutdown_super+0x62/0xf0
[23405.638276] [<ffffffff8117ded0>] kill_block_super+0x30/0x80
[23405.638279] [<ffffffff8117e1a5>] deactivate_locked_super+0x45/0x70
[23405.638283] [<ffffffff8117ee4e>] deactivate_super+0x4e/0x70
[23405.638287] [<ffffffff8119b1d6>] mntput_no_expire+0x106/0x160
[23405.638289] [<ffffffff8119c1fe>] sys_umount+0x6e/0x3b0
[23405.638293] [<ffffffff8163d569>] system_call_fastpath+0x16/0x1b
[23405.638296]
[23405.638296] -> #0 ((&mp->m_flush_work)){+.+.+.}:
[23405.638298] [<ffffffff810b25e8>] __lock_acquire+0x1ac8/0x1b90
[23405.638301] [<ffffffff810b2c82>] lock_acquire+0xa2/0x140
[23405.638304] [<ffffffff810720a1>] wait_on_work+0x41/0x160
[23405.638307] [<ffffffff81072203>] flush_work_sync+0x43/0x90
[23405.638323] [<ffffffffa036ec7f>] xfs_flush_inodes+0x2f/0x40 [xfs]
[23405.638341] [<ffffffffa0371d2e>] xfs_create+0x3be/0x640 [xfs]
[23405.638357] [<ffffffffa036888f>] xfs_vn_mknod+0x8f/0x1c0 [xfs]
[23405.638372] [<ffffffffa03689f3>] xfs_vn_create+0x13/0x20 [xfs]
[23405.638375] [<ffffffff8118aeb5>] vfs_create+0xb5/0x120
[23405.638378] [<ffffffff8118bcc0>] do_last+0xda0/0xf00
[23405.638380] [<ffffffff8118bed3>] path_openat+0xb3/0x4c0
[23405.638383] [<ffffffff8118c6f2>] do_filp_open+0x42/0xa0
[23405.638386] [<ffffffff8117b040>] do_sys_open+0x100/0x1e0
[23405.638389] [<ffffffff8117b141>] sys_open+0x21/0x30
[23405.638391] [<ffffffff8163d569>] system_call_fastpath+0x16/0x1b
[23405.638392]
[23405.638392] other info that might help us debug this:
[23405.638392]
[23405.638393] Possible unsafe locking scenario:
[23405.638393]
[23405.638394] CPU0 CPU1
[23405.638394] ---- ----
[23405.638396] lock(sb_internal#2);
[23405.638398] lock((&mp->m_flush_work));
[23405.638400] lock(sb_internal#2);
[23405.638402] lock((&mp->m_flush_work));
[23405.638402]
[23405.638402] *** DEADLOCK ***
[23405.638402]
[23405.638404] 3 locks held by fill2/7976:
[23405.638409] #0: (sb_writers#14){.+.+.+}, at: [<ffffffff8119b5b4>] mnt_want_write+0x24/0x50
[23405.638414] #1: (&type->i_mutex_dir_key#9){+.+.+.}, at: [<ffffffff8118b22b>] do_last+0x30b/0xf00
[23405.638440] #2: (sb_internal#2){.+.+.+}, at: [<ffffffffa03afe5d>] xfs_trans_alloc+0x2d/0x50 [xfs]
[23405.638441]
[23405.638441] stack backtrace:
[23405.638443] Pid: 7976, comm: fill2 Not tainted 3.6.0-rc2-ceph-00143-g995fc06 #1
[23405.638444] Call Trace:
[23405.638448] [<ffffffff8162a77c>] print_circular_bug+0x1fb/0x20c
[23405.638451] [<ffffffff810b25e8>] __lock_acquire+0x1ac8/0x1b90
[23405.638455] [<ffffffff81050500>] ? __mmdrop+0x60/0x90
[23405.638459] [<ffffffff8108494a>] ? finish_task_switch+0x10a/0x110
[23405.638463] [<ffffffff81072060>] ? busy_worker_rebind_fn+0x100/0x100
[23405.638465] [<ffffffff810b2c82>] lock_acquire+0xa2/0x140
[23405.638468] [<ffffffff81072060>] ? busy_worker_rebind_fn+0x100/0x100
[23405.638472] [<ffffffff81634c30>] ? _raw_spin_unlock_irq+0x30/0x40
[23405.638475] [<ffffffff810720a1>] wait_on_work+0x41/0x160
[23405.638477] [<ffffffff81072060>] ? busy_worker_rebind_fn+0x100/0x100
[23405.638480] [<ffffffff810710a8>] ? start_flush_work+0x108/0x180
[23405.638483] [<ffffffff81634e5f>] ? _raw_spin_unlock_irqrestore+0x3f/0x80
[23405.638486] [<ffffffff81072203>] flush_work_sync+0x43/0x90
[23405.638488] [<ffffffff810b379d>] ? trace_hardirqs_on+0xd/0x10
[23405.638491] [<ffffffff810706c4>] ? __queue_work+0xe4/0x3b0
[23405.638509] [<ffffffffa036ec7f>] xfs_flush_inodes+0x2f/0x40 [xfs]
[23405.638527] [<ffffffffa0371d2e>] xfs_create+0x3be/0x640 [xfs]
[23405.638529] [<ffffffff81192254>] ? d_rehash+0x24/0x40
[23405.638545] [<ffffffffa036888f>] xfs_vn_mknod+0x8f/0x1c0 [xfs]
[23405.638561] [<ffffffffa03689f3>] xfs_vn_create+0x13/0x20 [xfs]
[23405.638564] [<ffffffff8118aeb5>] vfs_create+0xb5/0x120
[23405.638567] [<ffffffff8118bcc0>] do_last+0xda0/0xf00
[23405.638570] [<ffffffff8118bed3>] path_openat+0xb3/0x4c0
[23405.638573] [<ffffffff8118c6f2>] do_filp_open+0x42/0xa0
[23405.638577] [<ffffffff8132babd>] ? do_raw_spin_unlock+0x5d/0xb0
[23405.638579] [<ffffffff81634c6b>] ? _raw_spin_unlock+0x2b/0x40
[23405.638582] [<ffffffff81199a22>] ? alloc_fd+0xd2/0x120
[23405.638585] [<ffffffff8117b040>] do_sys_open+0x100/0x1e0
[23405.638588] [<ffffffff8117b141>] sys_open+0x21/0x30
[23405.638590] [<ffffffff8163d569>] system_call_fastpath+0x16/0x1b
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