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Message-ID: <1342183843.7380.112.camel@marge.simpson.net>
Date: Fri, 13 Jul 2012 14:50:43 +0200
From: Mike Galbraith <efault@....de>
To: Chris Mason <chris.mason@...ionio.com>
Cc: Thomas Gleixner <tglx@...utronix.de>,
"linux-rt-users@...r.kernel.org" <linux-rt-users@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
linux-fsdevel <linux-fsdevel@...r.kernel.org>,
Steven Rostedt <rostedt@...dmis.org>,
Peter Zijlstra <peterz@...radead.org>
Subject: Re: 3.4.4-rt13: btrfs + xfstests 006 = BOOM.. and a bonus rt_mutex
deadlock report for absolutely free!
On Fri, 2012-07-13 at 06:47 -0400, Chris Mason wrote:
> On Fri, Jul 13, 2012 at 04:26:26AM -0600, Thomas Gleixner wrote:
> > On Fri, 13 Jul 2012, Mike Galbraith wrote:
> > > On Fri, 2012-07-13 at 11:52 +0200, Thomas Gleixner wrote:
> > > > On Fri, 13 Jul 2012, Mike Galbraith wrote:
> > > > > On Thu, 2012-07-12 at 15:31 +0200, Thomas Gleixner wrote:
> > > > > > Bingo, that makes it more likely that this is caused by copying w/o
> > > > > > initializing the lock and then freeing the original structure.
> > > > > >
> > > > > > A quick check for memcpy finds that __btrfs_close_devices() does a
> > > > > > memcpy of btrfs_device structs w/o initializing the lock in the new
> > > > > > copy, but I have no idea whether that's the place we are looking for.
> > > > >
> > > > > Thanks a bunch Thomas. I doubt I would have ever figured out that lala
> > > > > land resulted from _copying_ a lock. That's one I won't be forgetting
> > > > > any time soon. Box not only survived a few thousand xfstests 006 runs,
> > > > > dbench seemed disinterested in deadlocking virgin 3.0-rt.
> > > >
> > > > Cute. It think that the lock copying caused the deadlock problem as
> > > > the list pointed to the wrong place, so we might have ended up with
> > > > following down the wrong chain when walking the list as long as the
> > > > original struct was not freed. That beast is freed under RCU so there
> > > > could be a rcu read side critical section fiddling with the old lock
> > > > and cause utter confusion.
> > >
> > > Virgin 3.0-rt appears to really be solid. But then it doesn't have
> > > pesky rwlocks.
> >
> > Ah. So 3.0 is not having those rwlock thingies. Bummer.
> >
> > > > /me goes and writes a nastigram^W proper changelog
> > > >
> > > > > btrfs still locks up in my enterprise kernel, so I suppose I had better
> > > > > plug your fix into 3.4-rt and see what happens, and go beat hell out of
> > > > > virgin 3.0-rt again to be sure box really really survives dbench.
> > > >
> > > > A test against 3.4-rt sans enterprise mess might be nice as well.
> > >
> > > Enterprise is 3.0-stable with um 555 btrfs patches (oh dear).
> > >
> > > Virgin 3.4-rt and 3.2-rt deadlock gripe. Enterprise doesn't gripe, but
> > > deadlocks, so I have another adventure in my future even if I figure out
> > > wth to do about rwlocks.
> >
> > Hrmpf. /me goes to stare into fs/btrfs/ some more.
>
> Please post the deadlocks here, I'll help ;)
This is the one from top of thread. Below that is without the deadlock
detector.
[ 692.857165] ============================================
[ 692.863963] [ BUG: circular locking deadlock detected! ]
[ 692.869264] Not tainted
[ 692.871708] --------------------------------------------
[ 692.877008] btrfs-delayed-m/1404 is deadlocking current task dbench/7937
[ 692.877009]
[ 692.885183]
[ 692.885184] 1) dbench/7937 is trying to acquire this lock:
[ 692.892149] [ffff88014d6aea80] {&(&eb->lock)->lock}
[ 692.897102] .. ->owner: ffff880175808501
[ 692.901018] .. held by: btrfs-delayed-m: 1404 [ffff880175808500, 120]
[ 692.907657]
[ 692.907657] 2) btrfs-delayed-m/1404 is blocked on this lock:
[ 692.914797] [ffff88014bf58d60] {&(&eb->lock)->lock}
[ 692.919751] .. ->owner: ffff880175186101
[ 692.923672] .. held by: dbench: 7937 [ffff880175186100, 120]
[ 692.930309]
[ 692.930309] btrfs-delayed-m/1404's [blocked] stackdump:
[ 692.930310]
[ 692.938504] ffff880177575aa0 0000000000000046 ffff88014bf58d60 000000000000fb00
[ 692.938507] 000000000000fb00 ffff880177575fd8 000000000000fb00 ffff880177574000
[ 692.938509] ffff880177575fd8 000000000000fb00 ffff88017662f240 ffff880175808500
[ 692.960635] Call Trace:
[ 692.963085] [<ffffffff814c68e9>] schedule+0x29/0x90
[ 692.963087] [<ffffffff814c745d>] rt_spin_lock_slowlock+0xfd/0x330
[ 692.963090] [<ffffffff814c7a39>] __rt_spin_lock+0x9/0x10
[ 692.963092] [<ffffffff814c7b27>] rt_read_lock+0x27/0x40
[ 692.963096] [<ffffffff812550cf>] btrfs_clear_lock_blocking_rw+0x6f/0x180
[ 692.963099] [<ffffffff811fabd2>] btrfs_clear_path_blocking+0x32/0x70
[ 692.963102] [<ffffffff81200342>] btrfs_search_slot+0x6b2/0x810
[ 692.963105] [<ffffffff812148da>] btrfs_lookup_inode+0x2a/0xa0
[ 692.963107] [<ffffffff814c7312>] ? rt_mutex_lock+0x12/0x20
[ 692.963111] [<ffffffff8126d0bc>] btrfs_update_delayed_inode+0x6c/0x160
[ 692.963113] [<ffffffff814c7ab9>] ? _mutex_unlock+0x9/0x10
[ 692.963116] [<ffffffff8126e142>] btrfs_async_run_delayed_node_done+0x182/0x1a0
[ 692.963119] [<ffffffff8124ed5f>] worker_loop+0xaf/0x430
[ 692.963121] [<ffffffff8124ecb0>] ? btrfs_queue_worker+0x1e0/0x1e0
[ 692.963123] [<ffffffff8124ecb0>] ? btrfs_queue_worker+0x1e0/0x1e0
[ 692.963127] [<ffffffff8105850e>] kthread+0xae/0xc0
[ 692.963129] [<ffffffff814c68e9>] ? schedule+0x29/0x90
[ 692.963133] [<ffffffff810015bc>] ? __switch_to+0x14c/0x410
[ 692.963137] [<ffffffff81061e44>] ? finish_task_switch+0x54/0xd0
[ 692.963140] [<ffffffff814ceca4>] kernel_thread_helper+0x4/0x10
[ 692.963143] [<ffffffff81058460>] ? __init_kthread_worker+0x50/0x50
[ 692.963145] [<ffffffff814ceca0>] ? gs_change+0x13/0x13
[ 692.963146]
[ 692.963147] dbench/7937's [current] stackdump:
[ 692.963147]
[ 693.098724] Pid: 7937, comm: dbench Not tainted 3.4.4-rt13 #25
[ 693.104544] Call Trace:
[ 693.106993] [<ffffffff8108b436>] debug_rt_mutex_print_deadlock+0x176/0x190
[ 693.106995] [<ffffffff814c74ec>] rt_spin_lock_slowlock+0x18c/0x330
[ 693.106998] [<ffffffff814c7a39>] __rt_spin_lock+0x9/0x10
[ 693.107000] [<ffffffff814c7b27>] rt_read_lock+0x27/0x40
[ 693.107002] [<ffffffff8125538c>] btrfs_try_tree_read_lock+0x4c/0x80
[ 693.107004] [<ffffffff812001bd>] btrfs_search_slot+0x52d/0x810
[ 693.107007] [<ffffffff812027ba>] btrfs_next_leaf+0xea/0x440
[ 693.107010] [<ffffffff81238ed8>] ? btrfs_token_dir_data_len+0x58/0xd0
[ 693.107012] [<ffffffff81238ed8>] ? btrfs_token_dir_data_len+0x58/0xd0
[ 693.107016] [<ffffffff81222e17>] btrfs_real_readdir+0x247/0x610
[ 693.107020] [<ffffffff81131350>] ? sys_ioctl+0xa0/0xa0
[ 693.107022] [<ffffffff81131350>] ? sys_ioctl+0xa0/0xa0
[ 693.107024] [<ffffffff81131660>] vfs_readdir+0xb0/0xd0
[ 693.107026] [<ffffffff81131840>] sys_getdents64+0x80/0xe0
[ 693.107030] [<ffffffff814cd9b9>] system_call_fastpath+0x16/0x1b
[ 693.107032] [ turning off deadlock detection.Please report this trace. ]
[ 693.107033]
[ 679.476016] SysRq : Show Blocked State
[ 679.479781] task PC stack pid father
[ 679.485708] btrfs-endio-wri D ffffffff81605920 0 1314 2 0x00000000
[ 679.492785] ffff880172939810 0000000000000046 ffff8801774ca538 000000000000f7c0
[ 679.492789] 000000000000f7c0 ffff880172939fd8 ffff880172938000 000000000000f7c0
[ 679.492792] ffff880172939fd8 000000000000f7c0 ffff88017a4caa60 ffff8801744a88e0
[ 679.514922] Call Trace:
[ 679.517374] [<ffffffff814ca569>] schedule+0x29/0x90
[ 679.517378] [<ffffffff814cb525>] rt_spin_lock_slowlock+0xd5/0x2bf
[ 679.517382] [<ffffffff814cb821>] __rt_spin_lock+0x21/0x30
[ 679.517384] [<ffffffff814cb927>] rt_read_lock+0x27/0x40
[ 679.517388] [<ffffffff81257d5d>] btrfs_tree_read_lock+0x5d/0x160
[ 679.517392] [<ffffffff812e46c6>] ? cpumask_next_and+0x36/0x50
[ 679.517397] [<ffffffff811fd863>] btrfs_read_lock_root_node+0x33/0x40
[ 679.517400] [<ffffffff81202919>] btrfs_search_slot+0x459/0x810
[ 679.517404] [<ffffffff8110dd60>] ? poison_obj+0x30/0x50
[ 679.517409] [<ffffffff81215957>] btrfs_lookup_file_extent+0x37/0x40
[ 679.517412] [<ffffffff811fd375>] ? btrfs_alloc_path+0x15/0x20
[ 679.517417] [<ffffffff81231bce>] btrfs_drop_extents+0xfe/0xa70
[ 679.517421] [<ffffffff814cf69d>] ? sub_preempt_count+0x9d/0xd0
[ 679.517424] [<ffffffff81066bb4>] ? migrate_enable+0xf4/0x1d0
[ 679.517429] [<ffffffff8110eb81>] ? cache_alloc_debugcheck_after+0x101/0x1a0
[ 679.517432] [<ffffffff81110545>] ? kmem_cache_alloc+0x1d5/0x200
[ 679.517436] [<ffffffff81224add>] insert_reserved_file_extent.clone.0+0x7d/0x270
[ 679.517440] [<ffffffff812218ab>] ? start_transaction+0x8b/0x290
[ 679.517443] [<ffffffff8122847e>] btrfs_finish_ordered_io+0x32e/0x3b0
[ 679.517451] [<ffffffff81047d1b>] ? try_to_del_timer_sync+0x6b/0xa0
[ 679.517455] [<ffffffff81228515>] btrfs_writepage_end_io_hook+0x15/0x20
[ 679.517459] [<ffffffff812446b4>] end_extent_writepage+0x64/0x100
[ 679.517463] [<ffffffff8124478b>] end_bio_extent_writepage+0x3b/0xa0
[ 679.517468] [<ffffffff81151af8>] bio_endio+0x18/0x30
[ 679.517470] [<ffffffff81219ba0>] end_workqueue_fn+0x40/0x50
[ 679.517473] [<ffffffff81251883>] worker_loop+0xc3/0x450
[ 679.517476] [<ffffffff814ca17f>] ? __schedule+0x2df/0x640
[ 679.517480] [<ffffffff812517c0>] ? btrfs_queue_worker+0x220/0x220
[ 679.517483] [<ffffffff812517c0>] ? btrfs_queue_worker+0x220/0x220
[ 679.517486] [<ffffffff81059586>] kthread+0x96/0xa0
[ 679.517490] [<ffffffff81062fb4>] ? finish_task_switch+0x54/0xd0
[ 679.517494] [<ffffffff814d2d24>] kernel_thread_helper+0x4/0x10
[ 679.517498] [<ffffffff810594f0>] ? __init_kthread_worker+0x50/0x50
[ 679.517501] [<ffffffff814d2d20>] ? gs_change+0x13/0x13
[ 679.517509] btrfs-transacti D ffffffff81605920 0 1320 2 0x00000000
[ 679.725747] ffff880172d07a50 0000000000000046 ffff8801774ca538 000000000000f7c0
[ 679.725750] 000000000000f7c0 ffff880172d07fd8 ffff880172d06000 000000000000f7c0
[ 679.725753] ffff880172d07fd8 000000000000f7c0 ffff88017a4929e0 ffff880176320920
[ 679.747879] Call Trace:
[ 679.750326] [<ffffffff814ca569>] schedule+0x29/0x90
[ 679.750328] [<ffffffff814cb525>] rt_spin_lock_slowlock+0xd5/0x2bf
[ 679.750331] [<ffffffff814cb821>] __rt_spin_lock+0x21/0x30
[ 679.750333] [<ffffffff814cb927>] rt_read_lock+0x27/0x40
[ 679.750335] [<ffffffff81257d5d>] btrfs_tree_read_lock+0x5d/0x160
[ 679.750338] [<ffffffff814cf69d>] ? sub_preempt_count+0x9d/0xd0
[ 679.750340] [<ffffffff81066bb4>] ? migrate_enable+0xf4/0x1d0
[ 679.750343] [<ffffffff811fd863>] btrfs_read_lock_root_node+0x33/0x40
[ 679.750345] [<ffffffff81202919>] btrfs_search_slot+0x459/0x810
[ 679.750349] [<ffffffff81270d13>] btrfs_delete_delayed_items+0x63/0x100
[ 679.750352] [<ffffffff812710d2>] btrfs_run_delayed_items+0x112/0x160
[ 679.750355] [<ffffffff81220da2>] btrfs_commit_transaction+0x322/0xa70
[ 679.750357] [<ffffffff8122021a>] ? join_transaction+0x35a/0x3a0
[ 679.750360] [<ffffffff81059d30>] ? wake_up_bit+0x40/0x40
[ 679.750362] [<ffffffff81219a33>] transaction_kthread+0x273/0x2f0
[ 679.750364] [<ffffffff812197c0>] ? btrfs_congested_fn+0xb0/0xb0
[ 679.750367] [<ffffffff812197c0>] ? btrfs_congested_fn+0xb0/0xb0
[ 679.750369] [<ffffffff81059586>] kthread+0x96/0xa0
[ 679.750371] [<ffffffff81062fb4>] ? finish_task_switch+0x54/0xd0
[ 679.750374] [<ffffffff814d2d24>] kernel_thread_helper+0x4/0x10
[ 679.750377] [<ffffffff810594f0>] ? __init_kthread_worker+0x50/0x50
[ 679.750379] [<ffffffff814d2d20>] ? gs_change+0x13/0x13
[ 679.750401] dbench D ffffffff81605920 0 7812 1 0x00000004
[ 679.886585] ffff880174d99a98 0000000000000086 000000000000b380 000000000000f7c0
[ 679.886587] 000000000000f7c0 ffff880174d99fd8 ffff880174d98000 000000000000f7c0
[ 679.886590] ffff880174d99fd8 000000000000f7c0 ffffffff81816020 ffff8801738be700
[ 679.908712] Call Trace:
[ 679.911158] [<ffffffff810c87e0>] ? __lock_page+0x70/0x70
[ 679.911160] [<ffffffff814ca569>] schedule+0x29/0x90
[ 679.911163] [<ffffffff814ca657>] io_schedule+0x87/0xd0
[ 679.911165] [<ffffffff810c87e9>] sleep_on_page+0x9/0x10
[ 679.911167] [<ffffffff814c97a7>] __wait_on_bit+0x57/0x80
[ 679.911170] [<ffffffff810c983f>] ? find_get_pages_tag+0xcf/0x190
[ 679.911172] [<ffffffff810c8a0e>] wait_on_page_bit+0x6e/0x80
[ 679.911175] [<ffffffff81059d70>] ? autoremove_wake_function+0x40/0x40
[ 679.911177] [<ffffffff810d58b0>] ? pagevec_lookup_tag+0x20/0x30
[ 679.911180] [<ffffffff810c900e>] filemap_fdatawait_range+0xee/0x190
[ 679.911183] [<ffffffff812460bc>] ? extent_writepages+0x4c/0x60
[ 679.911185] [<ffffffff81226190>] ? btrfs_submit_direct+0x1d0/0x1d0
[ 679.911188] [<ffffffff811113e6>] ? kfree+0x1a6/0x2e0
[ 679.911190] [<ffffffff812240b2>] ? btrfs_writepages+0x22/0x30
[ 679.911192] [<ffffffff810d4dbf>] ? do_writepages+0x1f/0x40
[ 679.911195] [<ffffffff810c9e30>] filemap_write_and_wait_range+0x70/0x80
[ 679.911198] [<ffffffff81230587>] btrfs_sync_file+0x37/0x1b0
[ 679.911201] [<ffffffff8114ba50>] generic_write_sync+0x50/0x70
[ 679.911203] [<ffffffff812316dc>] btrfs_file_aio_write+0x31c/0x370
[ 679.911207] [<ffffffff811208da>] do_sync_write+0xda/0x120
[ 679.911210] [<ffffffff810ec752>] ? handle_mm_fault+0x162/0x220
[ 679.911213] [<ffffffff8104bc99>] ? kill_something_info+0x49/0x160
[ 679.911216] [<ffffffff812b45a3>] ? apparmor_file_permission+0x13/0x20
[ 679.911219] [<ffffffff8128ef27>] ? security_file_permission+0x27/0xb0
[ 679.911222] [<ffffffff811211c6>] vfs_write+0xc6/0x180
[ 679.911224] [<ffffffff81121672>] sys_pwrite64+0xa2/0xb0
[ 679.911227] [<ffffffff814d1a39>] system_call_fastpath+0x16/0x1b
[ 679.911229] dbench D ffffffff81605920 0 7813 1 0x00000004
[ 680.074937] ffff880174445908 0000000000000086 ffff8801744458a8 000000000000f7c0
[ 680.074940] 000000000000f7c0 ffff880174445fd8 ffff880174444000 000000000000f7c0
[ 680.074942] ffff880174445fd8 000000000000f7c0 ffff88017a4e4ae0 ffff880174eb62c0
[ 680.097069] Call Trace:
[ 680.099514] [<ffffffff814ca569>] schedule+0x29/0x90
[ 680.099516] [<ffffffff814cb525>] rt_spin_lock_slowlock+0xd5/0x2bf
[ 680.099519] [<ffffffff810d083a>] ? prep_new_page+0x12a/0x190
[ 680.099521] [<ffffffff814cb821>] __rt_spin_lock+0x21/0x30
[ 680.099523] [<ffffffff814cb927>] rt_read_lock+0x27/0x40
[ 680.099525] [<ffffffff81257d5d>] btrfs_tree_read_lock+0x5d/0x160
[ 680.099529] [<ffffffff812c21c6>] ? chksum_update+0x16/0x30
[ 680.099531] [<ffffffff811fd863>] btrfs_read_lock_root_node+0x33/0x40
[ 680.099533] [<ffffffff81202919>] btrfs_search_slot+0x459/0x810
[ 680.099536] [<ffffffff812148da>] btrfs_lookup_xattr+0x7a/0xc0
[ 680.099539] [<ffffffff8123e447>] __btrfs_getxattr+0x77/0x150
[ 680.099542] [<ffffffff8123e9cd>] btrfs_getxattr+0x7d/0x80
[ 680.099544] [<ffffffff8128d618>] cap_inode_need_killpriv+0x28/0x40
[ 680.099547] [<ffffffff8128ee41>] security_inode_need_killpriv+0x11/0x20
[ 680.099549] [<ffffffff810c85cb>] file_remove_suid+0x4b/0xc0
[ 680.099551] [<ffffffff810c88b5>] ? unlock_page+0x25/0x30
[ 680.099556] [<ffffffff810e7931>] ? __do_fault+0x431/0x530
[ 680.099559] [<ffffffff81231550>] btrfs_file_aio_write+0x190/0x370
[ 680.099562] [<ffffffff810eb437>] ? handle_pte_fault+0xe7/0x200
[ 680.099565] [<ffffffff811208da>] do_sync_write+0xda/0x120
[ 680.099567] [<ffffffff810ec752>] ? handle_mm_fault+0x162/0x220
[ 680.099570] [<ffffffff8104bc99>] ? kill_something_info+0x49/0x160
[ 680.099572] [<ffffffff812b45a3>] ? apparmor_file_permission+0x13/0x20
[ 680.099574] [<ffffffff8128ef27>] ? security_file_permission+0x27/0xb0
[ 680.099577] [<ffffffff811211c6>] vfs_write+0xc6/0x180
[ 680.099579] [<ffffffff81121672>] sys_pwrite64+0xa2/0xb0
[ 680.099582] [<ffffffff814d1a39>] system_call_fastpath+0x16/0x1b
[ 680.099584] dbench D ffffffff81605920 0 7814 1 0x00000004
[ 680.263730] ffff880176169be8 0000000000000086 ffff88017759a9b8 000000000000f7c0
[ 680.263733] 000000000000f7c0 ffff880176169fd8 ffff880176168000 000000000000f7c0
[ 680.263735] ffff880176169fd8 000000000000f7c0 ffff88017a476960 ffff8801756ec1c0
[ 680.285863] Call Trace:
[ 680.288309] [<ffffffff814ca569>] schedule+0x29/0x90
[ 680.288311] [<ffffffff814cb525>] rt_spin_lock_slowlock+0xd5/0x2bf
[ 680.288314] [<ffffffff814cb821>] __rt_spin_lock+0x21/0x30
[ 680.288316] [<ffffffff814cb927>] rt_read_lock+0x27/0x40
[ 680.288319] [<ffffffff81257eac>] btrfs_try_tree_read_lock+0x4c/0x80
[ 680.288321] [<ffffffff812029ed>] btrfs_search_slot+0x52d/0x810
[ 680.288324] [<ffffffff812256bf>] btrfs_real_readdir+0x1af/0x5f0
[ 680.288326] [<ffffffff81133690>] ? sys_ioctl+0xa0/0xa0
[ 680.288329] [<ffffffff81133690>] ? sys_ioctl+0xa0/0xa0
[ 680.288331] [<ffffffff811339a0>] vfs_readdir+0xb0/0xd0
[ 680.288333] [<ffffffff81133b80>] sys_getdents64+0x80/0xe0
[ 680.288336] [<ffffffff814d1a39>] system_call_fastpath+0x16/0x1b
[ 680.288338] dbench D ffffffff81605920 0 7815 1 0x00000004
[ 680.362625] ffff880174ea7ad8 0000000000000086 ffff88017759abf8 000000000000f7c0
[ 680.362627] 000000000000f7c0 ffff880174ea7fd8 ffff880174ea6000 000000000000f7c0
[ 680.362630] ffff880174ea7fd8 000000000000f7c0 ffff88017a4fab60 ffff880174d5ca60
[ 680.384756] Call Trace:
[ 680.387202] [<ffffffff814ca569>] schedule+0x29/0x90
[ 680.387204] [<ffffffff814cb525>] rt_spin_lock_slowlock+0xd5/0x2bf
[ 680.387207] [<ffffffff814cb821>] __rt_spin_lock+0x21/0x30
[ 680.387209] [<ffffffff814cb927>] rt_read_lock+0x27/0x40
[ 680.387211] [<ffffffff81257eac>] btrfs_try_tree_read_lock+0x4c/0x80
[ 680.387214] [<ffffffff812029ed>] btrfs_search_slot+0x52d/0x810
[ 680.387216] [<ffffffff812148da>] btrfs_lookup_xattr+0x7a/0xc0
[ 680.387219] [<ffffffff8123e447>] __btrfs_getxattr+0x77/0x150
[ 680.387222] [<ffffffff814cf69d>] ? sub_preempt_count+0x9d/0xd0
[ 680.387225] [<ffffffff8127b060>] btrfs_get_acl+0xf0/0x250
[ 680.387227] [<ffffffff8122d33d>] ? btrfs_new_inode+0x2bd/0x360
[ 680.387230] [<ffffffff8127b2e1>] btrfs_init_acl+0x81/0x150
[ 680.387232] [<ffffffff8122258c>] btrfs_init_inode_security+0x2c/0x60
[ 680.387235] [<ffffffff8122ea51>] btrfs_mkdir+0x121/0x1f0
[ 680.387237] [<ffffffff8112dfc8>] vfs_mkdir+0xb8/0x130
[ 680.387240] [<ffffffff81131273>] sys_mkdirat+0xf3/0x100
[ 680.387242] [<ffffffff81131294>] sys_mkdir+0x14/0x20
[ 680.387244] [<ffffffff814d1a39>] system_call_fastpath+0x16/0x1b
[ 680.387246] dbench D ffffffff81605920 0 7818 1 0x00000004
[ 680.496083] ffff8801790c98e8 0000000000000082 ffff8801790c9888 000000000000f7c0
[ 680.496086] 000000000000f7c0 ffff8801790c9fd8 ffff8801790c8000 000000000000f7c0
[ 680.496088] ffff8801790c9fd8 000000000000f7c0 ffff88017a536be0 ffff880176072700
[ 680.518214] Call Trace:
[ 680.520658] [<ffffffff814ca569>] schedule+0x29/0x90
[ 680.520660] [<ffffffff814cb525>] rt_spin_lock_slowlock+0xd5/0x2bf
[ 680.520663] [<ffffffff814cb821>] ? __rt_spin_lock+0x21/0x30
[ 680.520665] [<ffffffff814cb821>] __rt_spin_lock+0x21/0x30
[ 680.520667] [<ffffffff814cb927>] rt_read_lock+0x27/0x40
[ 680.520669] [<ffffffff81257bef>] btrfs_clear_lock_blocking_rw+0x6f/0x180
[ 680.520672] [<ffffffff811fd422>] btrfs_clear_path_blocking+0x32/0x70
[ 680.520674] [<ffffffff81202ba2>] btrfs_search_slot+0x6e2/0x810
[ 680.520676] [<ffffffff812c21c6>] ? chksum_update+0x16/0x30
[ 680.520679] [<ffffffff81214bd6>] btrfs_lookup_dir_item+0x76/0xc0
[ 680.520682] [<ffffffff8122c8db>] btrfs_lookup_dentry+0x9b/0x370
[ 680.520685] [<ffffffff810659c1>] ? get_parent_ip+0x11/0x50
[ 680.520687] [<ffffffff814cf69d>] ? sub_preempt_count+0x9d/0xd0
[ 680.520690] [<ffffffff8122cbc8>] btrfs_lookup+0x18/0x70
[ 680.520693] [<ffffffff8112bba8>] __lookup_hash+0x58/0x120
[ 680.520695] [<ffffffff8112e59f>] do_lookup+0x2af/0x330
[ 680.520697] [<ffffffff8112f174>] path_lookupat+0x134/0x750
[ 680.520700] [<ffffffff8110eb10>] ? cache_alloc_debugcheck_after+0x90/0x1a0
[ 680.520702] [<ffffffff8111048a>] ? kmem_cache_alloc+0x11a/0x200
[ 680.520705] [<ffffffff8112f7bc>] do_path_lookup+0x2c/0xc0
[ 680.520707] [<ffffffff810659c1>] ? get_parent_ip+0x11/0x50
[ 680.520709] [<ffffffff81130d74>] user_path_at_empty+0x54/0xa0
[ 680.520712] [<ffffffff81049380>] ? check_kill_permission+0x100/0x190
[ 680.520714] [<ffffffff8104baad>] ? group_send_sig_info+0x3d/0x80
[ 680.520716] [<ffffffff8104bc23>] ? kill_pid_info+0x53/0x80
[ 680.520718] [<ffffffff81130dcc>] user_path_at+0xc/0x10
[ 680.520721] [<ffffffff81125f1f>] vfs_fstatat+0x3f/0x80
[ 680.520723] [<ffffffff81125f96>] vfs_stat+0x16/0x20
[ 680.520725] [<ffffffff811260df>] sys_newstat+0x1f/0x40
[ 680.520727] [<ffffffff81122d6d>] ? fput+0x1d/0x30
[ 680.520730] [<ffffffff8111edd1>] ? filp_close+0x61/0x90
[ 680.520732] [<ffffffff8111eea8>] ? sys_close+0xa8/0x110
[ 680.520735] [<ffffffff814d1a39>] system_call_fastpath+0x16/0x1b
[ 680.520737] rm D ffffffff81605920 0 7820 1 0x00000004
[ 680.714842] ffff880176411a08 0000000000000086 ffff8801774ca538 000000000000f7c0
[ 680.714844] 000000000000f7c0 ffff880176411fd8 ffff880176410000 000000000000f7c0
[ 680.714847] ffff880176411fd8 000000000000f7c0 ffff88017a4e4ae0 ffff880175892d20
[ 680.736972] Call Trace:
[ 680.739420] [<ffffffff814ca569>] schedule+0x29/0x90
[ 680.739422] [<ffffffff814cb525>] rt_spin_lock_slowlock+0xd5/0x2bf
[ 680.739426] [<ffffffff810659c1>] ? get_parent_ip+0x11/0x50
[ 680.739428] [<ffffffff814cb821>] __rt_spin_lock+0x21/0x30
[ 680.739430] [<ffffffff814cb927>] rt_read_lock+0x27/0x40
[ 680.739432] [<ffffffff81257d5d>] btrfs_tree_read_lock+0x5d/0x160
[ 680.739435] [<ffffffff81246a34>] ? free_extent_buffer+0x34/0x70
[ 680.739437] [<ffffffff812002f1>] ? read_block_for_search+0x161/0x210
[ 680.739440] [<ffffffff811fd863>] btrfs_read_lock_root_node+0x33/0x40
[ 680.739442] [<ffffffff81202919>] btrfs_search_slot+0x459/0x810
[ 680.739445] [<ffffffff8121716a>] btrfs_lookup_inode+0x2a/0xa0
[ 680.739448] [<ffffffff81224e1e>] btrfs_read_locked_inode+0x7e/0x3a0
[ 680.739450] [<ffffffff81223eb0>] ? btrfs_permission+0x60/0x60
[ 680.739453] [<ffffffff8122c33f>] btrfs_iget+0x9f/0x100
[ 680.739455] [<ffffffff8122cad0>] btrfs_lookup_dentry+0x290/0x370
[ 680.739458] [<ffffffff8122cbc8>] btrfs_lookup+0x18/0x70
[ 680.739461] [<ffffffff8112bba8>] __lookup_hash+0x58/0x120
[ 680.739463] [<ffffffff8112faf7>] ? user_path_parent+0x47/0x80
[ 680.739466] [<ffffffff8112bc84>] lookup_hash+0x14/0x20
[ 680.739468] [<ffffffff8112fbc6>] do_unlinkat+0x96/0x1d0
[ 680.739470] [<ffffffff81133987>] ? vfs_readdir+0x97/0xd0
[ 680.739472] [<ffffffff81133baf>] ? sys_getdents64+0xaf/0xe0
[ 680.739474] [<ffffffff811312dd>] sys_unlinkat+0x1d/0x40
[ 680.739477] [<ffffffff814d1a39>] system_call_fastpath+0x16/0x1b
[ 680.739479] rm D ffffffff81605920 0 7822 1 0x00000004
[ 680.883473] ffff880172e0fa28 0000000000000086 ffff8801774ca538 000000000000f7c0
[ 680.883475] 000000000000f7c0 ffff880172e0ffd8 ffff880172e0e000 000000000000f7c0
[ 680.883478] ffff880172e0ffd8 000000000000f7c0 ffff88017a476960 ffff8801791a4500
[ 680.905605] Call Trace:
[ 680.908050] [<ffffffff814ca569>] schedule+0x29/0x90
[ 680.908052] [<ffffffff814cb525>] rt_spin_lock_slowlock+0xd5/0x2bf
[ 680.908055] [<ffffffff814cb821>] __rt_spin_lock+0x21/0x30
[ 680.908057] [<ffffffff814cb927>] rt_read_lock+0x27/0x40
[ 680.908059] [<ffffffff81257d5d>] btrfs_tree_read_lock+0x5d/0x160
[ 680.908062] [<ffffffff814cf69d>] ? sub_preempt_count+0x9d/0xd0
[ 680.908065] [<ffffffff811fd863>] btrfs_read_lock_root_node+0x33/0x40
[ 680.908067] [<ffffffff81202919>] btrfs_search_slot+0x459/0x810
[ 680.908069] [<ffffffff81066bb4>] ? migrate_enable+0xf4/0x1d0
[ 680.908072] [<ffffffff8122aefc>] btrfs_truncate_inode_items+0x13c/0x880
[ 680.908074] [<ffffffff814cf69d>] ? sub_preempt_count+0x9d/0xd0
[ 680.908077] [<ffffffff810659c1>] ? get_parent_ip+0x11/0x50
[ 680.908079] [<ffffffff814cf69d>] ? sub_preempt_count+0x9d/0xd0
[ 680.908082] [<ffffffff812218ab>] ? start_transaction+0x8b/0x290
[ 680.908085] [<ffffffff8122bf54>] btrfs_evict_inode+0x194/0x2c0
[ 680.908087] [<ffffffff814cf69d>] ? sub_preempt_count+0x9d/0xd0
[ 680.908090] [<ffffffff8113b875>] evict+0xb5/0x1d0
[ 680.908092] [<ffffffff8113ba83>] iput_final+0xf3/0x220
[ 680.908095] [<ffffffff8113bbe9>] iput+0x39/0x50
[ 680.908097] [<ffffffff8112fc87>] do_unlinkat+0x157/0x1d0
[ 680.908099] [<ffffffff81133987>] ? vfs_readdir+0x97/0xd0
[ 680.908101] [<ffffffff81133baf>] ? sys_getdents64+0xaf/0xe0
[ 680.908104] [<ffffffff811312dd>] sys_unlinkat+0x1d/0x40
[ 680.908106] [<ffffffff814d1a39>] system_call_fastpath+0x16/0x1b
[ 680.908108] rm D ffffffff81605920 0 7827 1 0x00000004
[ 681.051241] ffff880172dffa98 0000000000000086 ffff8801774ca538 000000000000f7c0
[ 681.051244] 000000000000f7c0 ffff880172dfffd8 ffff880172dfe000 000000000000f7c0
[ 681.051246] ffff880172dfffd8 000000000000f7c0 ffff88017a476960 ffff8801761e4340
[ 681.073378] Call Trace:
[ 681.075823] [<ffffffff814ca569>] schedule+0x29/0x90
[ 681.075825] [<ffffffff814cb525>] rt_spin_lock_slowlock+0xd5/0x2bf
[ 681.075827] [<ffffffff814cb821>] __rt_spin_lock+0x21/0x30
[ 681.075829] [<ffffffff814cb927>] rt_read_lock+0x27/0x40
[ 681.075832] [<ffffffff81257d5d>] btrfs_tree_read_lock+0x5d/0x160
[ 681.075834] [<ffffffff810659c1>] ? get_parent_ip+0x11/0x50
[ 681.075837] [<ffffffff814cf69d>] ? sub_preempt_count+0x9d/0xd0
[ 681.075840] [<ffffffff811fd863>] btrfs_read_lock_root_node+0x33/0x40
[ 681.075842] [<ffffffff81202919>] btrfs_search_slot+0x459/0x810
[ 681.075844] [<ffffffff812c21c6>] ? chksum_update+0x16/0x30
[ 681.075847] [<ffffffff81214bd6>] btrfs_lookup_dir_item+0x76/0xc0
[ 681.075850] [<ffffffff8122c8db>] btrfs_lookup_dentry+0x9b/0x370
[ 681.075852] [<ffffffff810659c1>] ? get_parent_ip+0x11/0x50
[ 681.075855] [<ffffffff814cf69d>] ? sub_preempt_count+0x9d/0xd0
[ 681.075857] [<ffffffff8122cbc8>] btrfs_lookup+0x18/0x70
[ 681.075860] [<ffffffff8112bba8>] __lookup_hash+0x58/0x120
[ 681.075862] [<ffffffff8112faf7>] ? user_path_parent+0x47/0x80
[ 681.075864] [<ffffffff8112bc84>] lookup_hash+0x14/0x20
[ 681.075866] [<ffffffff8112fbc6>] do_unlinkat+0x96/0x1d0
[ 681.075869] [<ffffffff81133987>] ? vfs_readdir+0x97/0xd0
[ 681.075871] [<ffffffff81133baf>] ? sys_getdents64+0xaf/0xe0
[ 681.075873] [<ffffffff811312dd>] sys_unlinkat+0x1d/0x40
[ 681.075875] [<ffffffff814d1a39>] system_call_fastpath+0x16/0x1b
[ 681.075878] Sched Debug Version: v0.10, 3.4.4-rt13 #37
--
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