There's a lockdep splat:
[ 400.354652] run fstests btrfs/013 at 2016-08-24 14:36:41
[ 400.939980] BTRFS: device fsid 6dd1d6e7-e6a7-4754-b1da-6ae12db06087
devid 1 transid 3 /dev/vdh
[ 400.982129] BTRFS info (device vdh): disk space caching is enabled
[ 400.983470] BTRFS info (device vdh): has skinny extents
[ 400.984706] BTRFS info (device vdh): flagging fs with big metadata
feature
[ 400.993415] BTRFS info (device vdh): creating UUID tree
[ 411.057401] BTRFS info (device vdh): relocating block group
29360128 flags 36
[ 411.080278] BTRFS info (device vdh): found 2 extents
[ 411.092704] BTRFS info (device vdh): relocating block group
20971520 flags 34
[ 411.105887] BTRFS info (device vdh): found 1 extents
[ 411.117528] BTRFS info (device vdh): relocating block group
12582912 flags 1
[ 411.119023] =============================================
[ 411.119283] [ INFO: possible recursive locking detected ]
[ 411.119283] 4.8.0-rc3-13125-gff57150 #231 Not tainted
[ 411.119283] ---------------------------------------------
[ 411.119283] btrfs/12261 is trying to acquire lock:
[ 411.119283] (&fs_info->bg_delete_sem){++++..}, at:
[<ffffffffa0a2aeef>] btrfs_alloc_data_chunk_ondemand+0x9f/0x560 [btrfs]
[ 411.119283] but task is already holding lock:
[ 411.119283] (&fs_info->bg_delete_sem){++++..}, at:
[<ffffffffa0a727e4>] __btrfs_balance+0x374/0xe70 [btrfs]
[ 411.119283] other info that might help us debug this:
[ 411.119283] Possible unsafe locking scenario:
[ 411.119283] CPU0
[ 411.119283] ----
[ 411.119283] lock(&fs_info->bg_delete_sem);
[ 411.119283] lock(&fs_info->bg_delete_sem);
[ 411.119283] *** DEADLOCK ***
[ 411.119283] May be due to missing lock nesting notation
[ 411.119283] 6 locks held by btrfs/12261:
[ 411.119283] #0: (sb_writers#9){.+.+.+}, at: [<ffffffff8122f273>]
__sb_start_write+0xd3/0xf0
[ 411.119283] #1: (&fs_info->volume_mutex){+.+.+.}, at:
[<ffffffffa0a7db28>] btrfs_ioctl_balance+0x118/0x370 [btrfs]
[ 411.119283] #2: (&fs_info->bg_delete_sem){++++..}, at:
[<ffffffffa0a727e4>] __btrfs_balance+0x374/0xe70 [btrfs]
[ 411.119283] #3: (&fs_info->cleaner_mutex){+.+...}, at:
[<ffffffffa0aa620f>] btrfs_relocate_block_group+0x17f/0x2a0 [btrfs]
[ 411.119283] #4: (sb_internal){.+.+.+}, at: [<ffffffff8122f231>]
__sb_start_write+0x91/0xf0
[ 411.119283] #5: (&cur_trans->cache_write_mutex){+.+...}, at:
[<ffffffffa0a2bf3c>] btrfs_start_dirty_block_groups+0x1ac/0x550 [btrfs]
[ 411.119283] stack backtrace:
[ 411.119283] CPU: 6 PID: 12261 Comm: btrfs Not tainted
4.8.0-rc3-13125-gff57150 #231
[ 411.119283] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.9.0-1.fc24 04/01/2014
[ 411.119283] 0000000000000000 ffff880fd72371f8 ffffffff8149def7
0000000000000007
[ 411.119283] 0000000000000006 ffffffff8256a580 ffff880fe67a5d00
ffff880fd72372f8
[ 411.119283] ffffffff810c6a4b ffff880fd7237308 0000000000000046
ffff880fe67a6580
[ 411.119283] Call Trace:
[ 411.119283] [<ffffffff8149def7>] dump_stack+0x6b/0xa4
[ 411.119283] [<ffffffff810c6a4b>] __lock_acquire+0x73b/0x1800
[ 411.119283] [<ffffffffa0a0cc5a>] ? btrfs_free_path+0x2a/0x40 [btrfs]
[ 411.119283] [<ffffffffa0a0cc5a>] ? btrfs_free_path+0x2a/0x40 [btrfs]
[ 411.119283] [<ffffffff814bcb47>] ? debug_smp_processor_id+0x17/0x20
[ 411.119283] [<ffffffff810c7bc9>] lock_acquire+0xb9/0x290
[ 411.119283] [<ffffffffa0a2aeef>] ?
btrfs_alloc_data_chunk_ondemand+0x9f/0x560 [btrfs]
[ 411.119283] [<ffffffffa0a2aedb>] ?
btrfs_alloc_data_chunk_ondemand+0x8b/0x560 [btrfs]
[ 411.119283] [<ffffffff81992574>] down_read+0x34/0x60
[ 411.119283] [<ffffffffa0a2aeef>] ?
btrfs_alloc_data_chunk_ondemand+0x9f/0x560 [btrfs]
[ 411.119283] [<ffffffff819942d5>] ? _raw_spin_unlock+0x35/0x60
[ 411.119283] [<ffffffffa0a2aeef>]
btrfs_alloc_data_chunk_ondemand+0x9f/0x560 [btrfs]
[ 411.119283] [<ffffffffa0a2b619>] ? cache_save_setup+0x1f9/0x390
[btrfs]
[ 411.119283] [<ffffffffa0a2b3f8>]
btrfs_check_data_free_space+0x48/0x70 [btrfs]
[ 411.119283] [<ffffffffa0a2b659>] cache_save_setup+0x239/0x390 [btrfs]
[ 411.119283] [<ffffffffa0a2c027>]
btrfs_start_dirty_block_groups+0x297/0x550 [btrfs]
[ 411.119283] [<ffffffff810c5f91>] ?
trace_hardirqs_on_caller+0x101/0x1d0
[ 411.119283] [<ffffffff810c5cbe>] ? mark_held_locks+0x6e/0x90
[ 411.119283] [<ffffffff8198ff7a>] ?
__mutex_unlock_slowpath+0x10a/0x1b0
[ 411.119283] [<ffffffff810c5f91>] ?
trace_hardirqs_on_caller+0x101/0x1d0
[ 411.119283] [<ffffffff8198ff63>] ? __mutex_unlock_slowpath+0xf3/0x1b0
[ 411.119283] [<ffffffffa0a40a4d>]
btrfs_commit_transaction+0x16d/0xd80 [btrfs]
[ 411.119283] [<ffffffff814bcb23>] ? __this_cpu_preempt_check+0x13/0x20
[ 411.119283] [<ffffffff810c11a8>] ? percpu_down_read_trylock+0x48/0xa0
[ 411.119283] [<ffffffff8122f231>] ? __sb_start_write+0x91/0xf0
[ 411.119283] [<ffffffff8122f231>] ? __sb_start_write+0x91/0xf0
[ 411.119283] [<ffffffffa0a41b8b>] ? start_transaction+0xab/0x4b0
[btrfs]
[ 411.119283] [<ffffffffa0a9e8d4>] prepare_to_relocate+0xe4/0x110
[btrfs]
[ 411.119283] [<ffffffffa0aa5337>] relocate_block_group+0x47/0x7a0
[btrfs]
[ 411.119283] [<ffffffff810c606d>] ? trace_hardirqs_on+0xd/0x10
[ 411.119283] [<ffffffff81990791>] ? mutex_lock_nested+0x2b1/0x400
[ 411.119283] [<ffffffffa0aa620f>] ?
btrfs_relocate_block_group+0x17f/0x2a0 [btrfs]
[ 411.119283] [<ffffffff810c0f23>] ? up_write+0x23/0x50
[ 411.119283] [<ffffffffa0aa6217>]
btrfs_relocate_block_group+0x187/0x2a0 [btrfs]
[ 411.119283] [<ffffffffa0a71afa>] btrfs_relocate_chunk+0x8a/0x120
[btrfs]
[ 411.119283] [<ffffffffa0a72ee7>] __btrfs_balance+0xa77/0xe70 [btrfs]
[ 411.119283] [<ffffffff8198ff63>] ? __mutex_unlock_slowpath+0xf3/0x1b0
[ 411.119283] [<ffffffffa0a736d9>] btrfs_balance+0x3f9/0x690 [btrfs]
[ 411.119283] [<ffffffffa0a7dd33>] ? btrfs_ioctl_balance+0x323/0x370
[btrfs]
[ 411.119283] [<ffffffff810dcb8f>] ? rcu_read_lock_sched_held+0x4f/0x90
[ 411.119283] [<ffffffffa0a7d9ff>] ? kzalloc+0xf/0x20 [btrfs]
[ 411.119283] [<ffffffffa0a7dd33>] btrfs_ioctl_balance+0x323/0x370
[btrfs]
[ 411.119283] [<ffffffff8198df11>] ? __schedule+0x341/0xc00
[ 411.119283] [<ffffffff81994287>] ?
_raw_spin_unlock_irqrestore+0x67/0x80
[ 411.119283] [<ffffffffa0a852ab>] btrfs_ioctl+0x60b/0x1460 [btrfs]
[ 411.119283] [<ffffffff8112cfde>] ? __audit_syscall_entry+0xae/0x110
[ 411.119283] [<ffffffff810f2e2f>] ? current_kernel_time64+0x9f/0xb0
[ 411.119283] [<ffffffff810c5f91>] ?
trace_hardirqs_on_caller+0x101/0x1d0
[ 411.119283] [<ffffffff810c606d>] ? trace_hardirqs_on+0xd/0x10
[ 411.119283] [<ffffffff8112cfde>] ? __audit_syscall_entry+0xae/0x110
[ 411.119283] [<ffffffff81240c38>] vfs_ioctl+0x18/0x30
[ 411.119283] [<ffffffff8124135e>] do_vfs_ioctl+0x8e/0x670
[ 411.119283] [<ffffffff8112cfde>] ? __audit_syscall_entry+0xae/0x110
[ 411.119283] [<ffffffff8112d268>] ? __audit_syscall_exit+0x228/0x2b0
[ 411.119283] [<ffffffff810024c3>] ? syscall_trace_enter+0x213/0x3e0
[ 411.119283] [<ffffffff812419d2>] SyS_ioctl+0x92/0xa0
[ 411.119283] [<ffffffff81003013>] do_syscall_64+0x63/0x130
[ 411.119283] [<ffffffff8100201a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
[ 411.119283] [<ffffffff8199451a>] entry_SYSCALL64_slow_path+0x25/0x25
But we make it through btrfs/013 up to btrfs/071 and then:
[ 1721.312198] INFO: task btrfs-cleaner:28544 blocked for more than
120 seconds.
[ 1721.312995] Tainted: G W 4.8.0-rc3-13125-gff57150 #231
[ 1721.313710] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 1721.315255] btrfs-cleaner D ffff880fd6753b28 0 28544 2
0x00000080
[ 1721.316148] ffff880fd6753b28 0000000000000046 0000000000000046
0000000000000000
[ 1721.316989] 0000000000000246 ffff880f12bdc5c0 ffff880fe476c5c0
0000000000000000
[ 1721.317832] ffff880fdb48c500 0000000000000282 0000000000000282
0000000000000000
[ 1721.318695] Call Trace:
[ 1721.318857] [<ffffffff810c606d>] ? trace_hardirqs_on+0xd/0x10
[ 1721.319445] [<ffffffff8198eaba>] schedule+0x4a/0xc0
[ 1721.319945] [<ffffffffa0a3f07d>] wait_current_trans+0xbd/0x130
[btrfs]
[ 1721.320629] [<ffffffff810b97f0>] ? woken_wake_function+0x20/0x20
[ 1721.321308] [<ffffffff8122f273>] ? __sb_start_write+0xd3/0xf0
[ 1721.321884] [<ffffffffa0a41dca>] start_transaction+0x2ea/0x4b0
[btrfs]
[ 1721.322593] [<ffffffffa0a422d8>] btrfs_start_transaction+0x18/0x20
[btrfs]
[ 1721.323329] [<ffffffffa0a423ce>]
btrfs_start_transaction_fallback_global_rsv+0x2e/0xe0 [btrfs]
[ 1721.324276] [<ffffffffa0a182a4>]
btrfs_start_trans_remove_block_group+0x84/0xc0 [btrfs]
[ 1721.325140] [<ffffffffa0a1e6ac>]
btrfs_delete_unused_bgs+0x1fc/0x520 [btrfs]
[ 1721.325856] [<ffffffff8198ff63>] ? __mutex_unlock_slowpath+0xf3/0x1b0
[ 1721.326613] [<ffffffffa0a36400>] cleaner_kthread+0x1a0/0x1e0 [btrfs]
[ 1721.327301] [<ffffffffa0a36260>] ? btree_readpage+0x30/0x30 [btrfs]
[ 1721.327929] [<ffffffff8109058e>] kthread+0xde/0x100
[ 1721.328413] [<ffffffff8109b015>] ? schedule_tail+0x35/0xf0
[ 1721.328979] [<ffffffff8199467f>] ret_from_fork+0x1f/0x40
[ 1721.329526] [<ffffffff810904b0>] ? __init_kthread_worker+0x70/0x70
[ 1721.330165] INFO: lockdep is turned off.
[ 1721.330499] INFO: task btrfs-transacti:28545 blocked for more than
120 seconds.
[ 1721.331254] Tainted: G W 4.8.0-rc3-13125-gff57150 #231
[ 1721.331971] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 1721.332804] btrfs-transacti D ffff880fd70bfc88 0 28545 2
0x00000080
[ 1721.333571] ffff880fd70bfc88 0000000000000046 0000000000000046
0000000000000000
[ 1721.334411] 0000000000000246 ffff880f12bddd00 ffff880fe84c0000
ffff880f00000000
[ 1721.335299] ffff880fdb48c500 0000000000000282 0000000000000282
0000000000000000
[ 1721.336139] Call Trace:
[ 1721.336298] [<ffffffff810c606d>] ? trace_hardirqs_on+0xd/0x10
[ 1721.336855] [<ffffffff8198eaba>] schedule+0x4a/0xc0
[ 1721.337348] [<ffffffffa0a3f07d>] wait_current_trans+0xbd/0x130
[btrfs]
[ 1721.338076] [<ffffffff810b97f0>] ? woken_wake_function+0x20/0x20
[ 1721.338684] [<ffffffffa0a41d3a>] start_transaction+0x25a/0x4b0
[btrfs]
[ 1721.339377] [<ffffffffa0a41fa7>]
btrfs_attach_transaction+0x17/0x20 [btrfs]
[ 1721.340312] [<ffffffffa0a3987d>] transaction_kthread+0x19d/0x210
[btrfs]
[ 1721.341142] [<ffffffffa0a396e0>] ? close_ctree+0x380/0x380 [btrfs]
[ 1721.341757] [<ffffffff8109058e>] kthread+0xde/0x100
[ 1721.342406] [<ffffffff8109b015>] ? schedule_tail+0x35/0xf0
[ 1721.343047] [<ffffffff8199467f>] ret_from_fork+0x1f/0x40
[ 1721.343553] [<ffffffff810904b0>] ? __init_kthread_worker+0x70/0x70
[ 1721.344243] INFO: lockdep is turned off.
[ 1721.344582] INFO: task fsstress:28551 blocked for more than 120
seconds.
[ 1721.345270] Tainted: G W 4.8.0-rc3-13125-gff57150 #231
[ 1721.345947] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 1721.346757] fsstress D ffff880fd777fc78 0 28551 28548
0x00000080
[ 1721.347590] ffff880fd777fc78 0000000000000046 0000000000000046
0000000000000000
[ 1721.348506] 0000000000000246 ffff880ef7835d00 ffff880fe84845c0
0000000000000000
[ 1721.349349] ffff880fdb48c500 0000000000000286 0000000000000286
0000000000000000
[ 1721.350243] Call Trace:
[ 1721.350404] [<ffffffff810c606d>] ? trace_hardirqs_on+0xd/0x10
[ 1721.350970] [<ffffffff8198eaba>] schedule+0x4a/0xc0
[ 1721.351474] [<ffffffffa0a3f07d>] wait_current_trans+0xbd/0x130
[btrfs]
[ 1721.352178] [<ffffffff810b97f0>] ? woken_wake_function+0x20/0x20
[ 1721.352775] [<ffffffff819900de>] ? mutex_unlock+0xe/0x10
[ 1721.353349] [<ffffffffa0a41d3a>] start_transaction+0x25a/0x4b0
[btrfs]
[ 1721.354050] [<ffffffff81992d15>] ? rwsem_down_read_failed+0xc5/0x120
[ 1721.354682] [<ffffffff812691f0>] ? iter_file_splice_write+0x400/0x400
[ 1721.355368] [<ffffffffa0a424a7>]
btrfs_attach_transaction_barrier+0x27/0x60 [btrfs]
[ 1721.356210] [<ffffffffa0a02d6a>] btrfs_sync_fs+0x7a/0x250 [btrfs]
[ 1721.356813] [<ffffffff812691f0>] ? iter_file_splice_write+0x400/0x400
[ 1721.357489] [<ffffffff81269210>] sync_fs_one_sb+0x20/0x30
[ 1721.358132] [<ffffffff8122fe3f>] iterate_supers+0xaf/0xe0
[ 1721.358889] [<ffffffff81269705>] sys_sync+0x55/0x90
[ 1721.359428] [<ffffffff81003013>] do_syscall_64+0x63/0x130
[ 1721.360058] [<ffffffff8100201a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
[ 1721.360696] [<ffffffff8199451a>] entry_SYSCALL64_slow_path+0x25/0x25
[ 1721.361414] INFO: lockdep is turned off.
[ 1721.361751] INFO: task fsstress:28552 blocked for more than 120
seconds.
[ 1721.362445] Tainted: G W 4.8.0-rc3-13125-gff57150 #231
[ 1721.363210] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 1721.364051] fsstress D ffff880fdb077c78 0 28552 28548
0x00000080
[ 1721.364793] ffff880fdb077c78 0000000000000046 0000000000000046
0000000000000000
[ 1721.365653] 0000000000000246 ffff880ef7830000 ffff880fe84a0000
0000000000000000
[ 1721.366508] ffff880fdb48c500 0000000000000286 0000000000000286
0000000000000000
[ 1721.367362] Call Trace:
[ 1721.367521] [<ffffffff810c606d>] ? trace_hardirqs_on+0xd/0x10
[ 1721.368112] [<ffffffff8198eaba>] schedule+0x4a/0xc0
[ 1721.368588] [<ffffffffa0a3f07d>] wait_current_trans+0xbd/0x130
[btrfs]
[ 1721.369280] [<ffffffff810b97f0>] ? woken_wake_function+0x20/0x20
[ 1721.369867] [<ffffffff819900de>] ? mutex_unlock+0xe/0x10
[ 1721.370502] [<ffffffffa0a41d3a>] start_transaction+0x25a/0x4b0
[btrfs]
[ 1721.371221] [<ffffffff81992d15>] ? rwsem_down_read_failed+0xc5/0x120
[ 1721.371846] [<ffffffff812691f0>] ? iter_file_splice_write+0x400/0x400
[ 1721.372534] [<ffffffffa0a424a7>]
btrfs_attach_transaction_barrier+0x27/0x60 [btrfs]
[ 1721.373372] [<ffffffffa0a02d6a>] btrfs_sync_fs+0x7a/0x250 [btrfs]
[ 1721.373986] [<ffffffff812691f0>] ? iter_file_splice_write+0x400/0x400
[ 1721.374649] [<ffffffff81269210>] sync_fs_one_sb+0x20/0x30
[ 1721.375291] [<ffffffff8122fe3f>] iterate_supers+0xaf/0xe0
[ 1721.375811] [<ffffffff81269705>] sys_sync+0x55/0x90
[ 1721.376305] [<ffffffff81003013>] do_syscall_64+0x63/0x130
[ 1721.376832] [<ffffffff8100201a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
[ 1721.377503] [<ffffffff8199451a>] entry_SYSCALL64_slow_path+0x25/0x25
[ 1721.378222] INFO: lockdep is turned off.
[ 1721.378558] INFO: task fsstress:28553 blocked for more than 120
seconds.
[ 1721.379246] Tainted: G W 4.8.0-rc3-13125-gff57150 #231
[ 1721.379914] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 1721.380764] fsstress D ffff880f198efc78 0 28553 28548
0x00000080
[ 1721.381599] ffff880f198efc78 0000000000000046 0000000000000046
0000000000000000
[ 1721.382452] 0000000000000246 ffff880ef7832e80 ffff880f03029740
0000000000000000
[ 1721.383302] ffff880fdb48c500 0000000000000286 0000000000000286
0000000000000000
[ 1721.384209] Call Trace:
[ 1721.384368] [<ffffffff810c606d>] ? trace_hardirqs_on+0xd/0x10
[ 1721.384932] [<ffffffff8198eaba>] schedule+0x4a/0xc0
[ 1721.385436] [<ffffffffa0a3f07d>] wait_current_trans+0xbd/0x130
[btrfs]
[ 1721.386135] [<ffffffff810b97f0>] ? woken_wake_function+0x20/0x20
[ 1721.386723] [<ffffffff819900de>] ? mutex_unlock+0xe/0x10
[ 1721.387338] [<ffffffffa0a41d3a>] start_transaction+0x25a/0x4b0
[btrfs]
[ 1721.388049] [<ffffffff81992d15>] ? rwsem_down_read_failed+0xc5/0x120
[ 1721.388675] [<ffffffff812691f0>] ? iter_file_splice_write+0x400/0x400
[ 1721.389361] [<ffffffffa0a424a7>]
btrfs_attach_transaction_barrier+0x27/0x60 [btrfs]
[ 1721.390257] [<ffffffffa0a02d6a>] btrfs_sync_fs+0x7a/0x250 [btrfs]
[ 1721.390875] [<ffffffff812691f0>] ? iter_file_splice_write+0x400/0x400
[ 1721.391555] [<ffffffff81269210>] sync_fs_one_sb+0x20/0x30
[ 1721.392115] [<ffffffff8122fe3f>] iterate_supers+0xaf/0xe0
[ 1721.392636] [<ffffffff81269705>] sys_sync+0x55/0x90
[ 1721.393192] [<ffffffff81003013>] do_syscall_64+0x63/0x130
[ 1721.393710] [<ffffffff8100201a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
[ 1721.394376] [<ffffffff8199451a>] entry_SYSCALL64_slow_path+0x25/0x25
[ 1721.395038] INFO: lockdep is turned off.
[ 1721.395378] INFO: task fsstress:28554 blocked for more than 120
seconds.
[ 1721.396076] Tainted: G W 4.8.0-rc3-13125-gff57150 #231
[ 1721.396742] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 1721.397572] fsstress D ffff880fd4953c78 0 28554 28548
0x00000080
[ 1721.398360] ffff880fd4953c78 0000000000000046 0000000000000046
0000000000000000
[ 1721.399295] 0000000000000246 ffff880ef7831740 ffff880fe2fb8000
0000000000000002
[ 1721.400162] ffff880fdb48c500 0000000000000286 0000000000000286
0000000000000000
[ 1721.400983] Call Trace:
[ 1721.401180] [<ffffffff810c606d>] ? trace_hardirqs_on+0xd/0x10
[ 1721.401739] [<ffffffff8198eaba>] schedule+0x4a/0xc0
[ 1721.402323] [<ffffffffa0a3f07d>] wait_current_trans+0xbd/0x130
[btrfs]
[ 1721.402992] [<ffffffff810b97f0>] ? woken_wake_function+0x20/0x20
[ 1721.403613] [<ffffffff819900de>] ? mutex_unlock+0xe/0x10
[ 1721.404171] [<ffffffffa0a41d3a>] start_transaction+0x25a/0x4b0
[btrfs]
[ 1721.404824] [<ffffffff81992d15>] ? rwsem_down_read_failed+0xc5/0x120
[ 1721.405548] [<ffffffff812691f0>] ? iter_file_splice_write+0x400/0x400
[ 1721.406251] [<ffffffffa0a424a7>]
btrfs_attach_transaction_barrier+0x27/0x60 [btrfs]
[ 1721.407094] [<ffffffffa0a02d6a>] btrfs_sync_fs+0x7a/0x250 [btrfs]
[ 1721.407694] [<ffffffff812691f0>] ? iter_file_splice_write+0x400/0x400
[ 1721.408427] [<ffffffff81269210>] sync_fs_one_sb+0x20/0x30
[ 1721.408954] [<ffffffff8122fe3f>] iterate_supers+0xaf/0xe0
[ 1721.409497] [<ffffffff81269705>] sys_sync+0x55/0x90
[ 1721.409958] [<ffffffff81003013>] do_syscall_64+0x63/0x130
[ 1721.410502] [<ffffffff8100201a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
[ 1721.411219] [<ffffffff8199451a>] entry_SYSCALL64_slow_path+0x25/0x25
[ 1721.411856] INFO: lockdep is turned off.
[ 1721.412285] INFO: task fsstress:28555 blocked for more than 120
seconds.
[ 1721.412964] Tainted: G W 4.8.0-rc3-13125-gff57150 #231
[ 1721.413667] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 1721.414506] fsstress D ffff880fc5f93898 0 28555 28548
0x00000080
[ 1721.415408] ffff880fc5f93898 0000000000000000 0000000000000000
ffff880fc5f938c8
[ 1721.416280] 0000000000000046 ffff880ef78345c0 ffff880fe2fbdd00
ffff880f00000000
[ 1721.417137] 0000000000000000 0000000000000246 ffffffff00000000
0000000000000000
[ 1721.417961] Call Trace:
[ 1721.418156] [<ffffffff8198eaba>] schedule+0x4a/0xc0
[ 1721.418614] [<ffffffff810c606d>] ? trace_hardirqs_on+0xd/0x10
[ 1721.419206] [<ffffffff819941fb>] ? _raw_spin_unlock_irq+0x3b/0x60
[ 1721.419813] [<ffffffff81992d15>] rwsem_down_read_failed+0xc5/0x120
[ 1721.420560] [<ffffffff814aceb8>]
call_rwsem_down_read_failed+0x18/0x30
[ 1721.421261] [<ffffffff81992582>] down_read+0x42/0x60
[ 1721.421763] [<ffffffffa0a2aeef>] ?
btrfs_alloc_data_chunk_ondemand+0x9f/0x560 [btrfs]
[ 1721.422606] [<ffffffff819942d5>] ? _raw_spin_unlock+0x35/0x60
[ 1721.423212] [<ffffffffa0a2aeef>]
btrfs_alloc_data_chunk_ondemand+0x9f/0x560 [btrfs]
[ 1721.424070] [<ffffffffa0a9470d>] ?
btrfs_truncate_free_space_cache+0x17d/0x1d0 [btrfs]
[ 1721.424901] [<ffffffffa0a2b3f8>]
btrfs_check_data_free_space+0x48/0x70 [btrfs]
[ 1721.425779] [<ffffffffa0a2b659>] cache_save_setup+0x239/0x390 [btrfs]
[ 1721.426486] [<ffffffffa0a6b564>] ? free_extent_buffer+0x44/0xb0
[btrfs]
[ 1721.427198] [<ffffffffa0a2b875>] btrfs_setup_space_cache+0xc5/0xe0
[btrfs]
[ 1721.427909] [<ffffffffa0a3e0ca>] commit_cowonly_roots+0xfa/0x310
[btrfs]
[ 1721.428706] [<ffffffffa0a3dfb4>] ? commit_fs_roots+0x1b4/0x1d0
[btrfs]
[ 1721.429426] [<ffffffffa0aba38a>] ?
btrfs_qgroup_account_extents+0x4a/0x270 [btrfs]
[ 1721.430265] [<ffffffffa0a40ec8>]
btrfs_commit_transaction+0x5e8/0xd80 [btrfs]
[ 1721.431092] [<ffffffff812065e4>] ? kmem_cache_alloc+0x1f4/0x320
[ 1721.431685] [<ffffffffa0a41c0a>] ? start_transaction+0x12a/0x4b0
[btrfs]
[ 1721.432391] [<ffffffff819900de>] ? mutex_unlock+0xe/0x10
[ 1721.432911] [<ffffffffa0a41b8b>] ? start_transaction+0xab/0x4b0
[btrfs]
[ 1721.433610] [<ffffffff81992d15>] ? rwsem_down_read_failed+0xc5/0x120
[ 1721.434349] [<ffffffff812691f0>] ? iter_file_splice_write+0x400/0x400
[ 1721.434994] [<ffffffff812691f0>] ? iter_file_splice_write+0x400/0x400
[ 1721.435667] [<ffffffffa0a02d81>] btrfs_sync_fs+0x91/0x250 [btrfs]
[ 1721.436318] [<ffffffff812691f0>] ? iter_file_splice_write+0x400/0x400
[ 1721.437040] [<ffffffff81269210>] sync_fs_one_sb+0x20/0x30
[ 1721.437563] [<ffffffff8122fe3f>] iterate_supers+0xaf/0xe0
[ 1721.438115] [<ffffffff81269705>] sys_sync+0x55/0x90
[ 1721.438570] [<ffffffff81003013>] do_syscall_64+0x63/0x130
[ 1721.439123] [<ffffffff8100201a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
[ 1721.439758] [<ffffffff8199451a>] entry_SYSCALL64_slow_path+0x25/0x25
[ 1721.440669] INFO: lockdep is turned off.
[ 1721.441200] INFO: task fsstress:28556 blocked for more than 120
seconds.
[ 1721.442201] Tainted: G W 4.8.0-rc3-13125-gff57150 #231
[ 1721.443187] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 1721.444087] fsstress D ffff880fd9c7bc78 0 28556 28548
0x00000080
[ 1721.444842] ffff880fd9c7bc78 0000000000000046 0000000000000046
0000000000000000
[ 1721.445707] 0000000000000246 ffff880fe2fbae80 ffff880ef7832e80
0000000000000000
[ 1721.446568] ffff880fdb48c500 0000000000000286 0000000000000286
0000000000000000
[ 1721.447466] Call Trace:
[ 1721.447626] [<ffffffff810c606d>] ? trace_hardirqs_on+0xd/0x10
[ 1721.448208] [<ffffffff8198eaba>] schedule+0x4a/0xc0
[ 1721.448674] [<ffffffffa0a3f07d>] wait_current_trans+0xbd/0x130
[btrfs]
[ 1721.449349] [<ffffffff810b97f0>] ? woken_wake_function+0x20/0x20
[ 1721.449913] [<ffffffff819900de>] ? mutex_unlock+0xe/0x10
[ 1721.450454] [<ffffffffa0a41d3a>] start_transaction+0x25a/0x4b0
[btrfs]
[ 1721.451119] [<ffffffff81992d15>] ? rwsem_down_read_failed+0xc5/0x120
[ 1721.451727] [<ffffffff812691f0>] ? iter_file_splice_write+0x400/0x400
[ 1721.452506] [<ffffffffa0a424a7>]
btrfs_attach_transaction_barrier+0x27/0x60 [btrfs]
[ 1721.453556] [<ffffffffa0a02d6a>] btrfs_sync_fs+0x7a/0x250 [btrfs]
[ 1721.454227] [<ffffffff812691f0>] ? iter_file_splice_write+0x400/0x400
[ 1721.454868] [<ffffffff81269210>] sync_fs_one_sb+0x20/0x30
[ 1721.455431] [<ffffffff8122fe3f>] iterate_supers+0xaf/0xe0
[ 1721.455959] [<ffffffff81269705>] sys_sync+0x55/0x90
[ 1721.456450] [<ffffffff81003013>] do_syscall_64+0x63/0x130
[ 1721.456982] [<ffffffff8100201a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
[ 1721.457653] [<ffffffff8199451a>] entry_SYSCALL64_slow_path+0x25/0x25
[ 1721.458327] INFO: lockdep is turned off.
[ 1721.458666] INFO: task fsstress:28557 blocked for more than 120
seconds.
[ 1721.459371] Tainted: G W 4.8.0-rc3-13125-gff57150 #231
[ 1721.460173] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 1721.461042] fsstress D ffff880f18f67c78 0 28557 28548
0x00000080
[ 1721.461798] ffff880f18f67c78 0000000000000046 0000000000000046
0000000000000000
[ 1721.462663] 0000000000000246 ffff880fe2fb9740 ffff880ef7830000
0000000000000000
[ 1721.463523] ffff880fdb48c500 0000000000000286 0000000000000286
0000000000000000
[ 1721.464393] Call Trace:
[ 1721.464553] [<ffffffff810c606d>] ? trace_hardirqs_on+0xd/0x10
[ 1721.465225] [<ffffffff8198eaba>] schedule+0x4a/0xc0
[ 1721.465726] [<ffffffffa0a3f07d>] wait_current_trans+0xbd/0x130
[btrfs]
[ 1721.466427] [<ffffffff810b97f0>] ? woken_wake_function+0x20/0x20
[ 1721.467059] [<ffffffff819900de>] ? mutex_unlock+0xe/0x10
[ 1721.467587] [<ffffffffa0a41d3a>] start_transaction+0x25a/0x4b0
[btrfs]
[ 1721.468365] [<ffffffff81992d15>] ? rwsem_down_read_failed+0xc5/0x120
[ 1721.469042] [<ffffffff812691f0>] ? iter_file_splice_write+0x400/0x400
[ 1721.469703] [<ffffffffa0a424a7>]
btrfs_attach_transaction_barrier+0x27/0x60 [btrfs]
[ 1721.470552] [<ffffffffa0a02d6a>] btrfs_sync_fs+0x7a/0x250 [btrfs]
[ 1721.471280] [<ffffffff812691f0>] ? iter_file_splice_write+0x400/0x400
[ 1721.471947] [<ffffffff81269210>] sync_fs_one_sb+0x20/0x30
[ 1721.472502] [<ffffffff8122fe3f>] iterate_supers+0xaf/0xe0
[ 1721.473066] [<ffffffff81269705>] sys_sync+0x55/0x90
[ 1721.473528] [<ffffffff81003013>] do_syscall_64+0x63/0x130
[ 1721.474141] [<ffffffff8100201a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
[ 1721.474802] [<ffffffff8199451a>] entry_SYSCALL64_slow_path+0x25/0x25
[ 1721.475475] INFO: lockdep is turned off.
[ 1721.475815] INFO: task fsstress:28558 blocked for more than 120
seconds.
[ 1721.476521] Tainted: G W 4.8.0-rc3-13125-gff57150 #231
[ 1721.477316] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 1721.478166] fsstress D ffff880fdb39bc78 0 28558 28548
0x00000080
[ 1721.478928] ffff880fdb39bc78 0000000000000046 0000000000000046
0000000000000000
[ 1721.479791] 0000000000000246 ffff880fe2fb8000 ffff880fe5c31740
0000000000000000
[ 1721.480730] ffff880fdb48c500 0000000000000286 0000000000000286
0000000000000000
[ 1721.481600] Call Trace:
[ 1721.481760] [<ffffffff810c606d>] ? trace_hardirqs_on+0xd/0x10
[ 1721.482366] [<ffffffff8198eaba>] schedule+0x4a/0xc0
[ 1721.482846] [<ffffffffa0a3f07d>] wait_current_trans+0xbd/0x130
[btrfs]
[ 1721.483620] [<ffffffff810b97f0>] ? woken_wake_function+0x20/0x20
[ 1721.484260] [<ffffffff819900de>] ? mutex_unlock+0xe/0x10
[ 1721.484794] [<ffffffffa0a41d3a>] start_transaction+0x25a/0x4b0
[btrfs]
[ 1721.485496] [<ffffffff81992d15>] ? rwsem_down_read_failed+0xc5/0x120
[ 1721.486232] [<ffffffff812691f0>] ? iter_file_splice_write+0x400/0x400
[ 1721.486917] [<ffffffffa0a424a7>]
btrfs_attach_transaction_barrier+0x27/0x60 [btrfs]
[ 1721.487769] [<ffffffffa0a02d6a>] btrfs_sync_fs+0x7a/0x250 [btrfs]
[ 1721.488427] [<ffffffff812691f0>] ? iter_file_splice_write+0x400/0x400
[ 1721.489177] [<ffffffff81269210>] sync_fs_one_sb+0x20/0x30
[ 1721.489706] [<ffffffff8122fe3f>] iterate_supers+0xaf/0xe0
[ 1721.490268] [<ffffffff81269705>] sys_sync+0x55/0x90
[ 1721.490733] [<ffffffff81003013>] do_syscall_64+0x63/0x130
[ 1721.491289] [<ffffffff8100201a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
[ 1721.491935] [<ffffffff8199451a>] entry_SYSCALL64_slow_path+0x25/0x25
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
