Re: Disabling in-memory write cache for x86-64 in Linux II
From: Diego Calleja
Date: Fri Nov 15 2013 - 10:51:51 EST
El Sábado, 26 de octubre de 2013 00:32:25 Fengguang Wu escribió:
> What's the kernel you are running? And it's writing to a hard disk?
> The stalls are most likely caused by either one of
>
> 1) write IO starves read IO
> 2) direct page reclaim blocked when
> - trying to writeout PG_dirty pages
> - trying to lock PG_writeback pages
>
> Which may be confirmed by running
>
> ps -eo ppid,pid,user,stat,pcpu,comm,wchan:32
> or
> echo w > /proc/sysrq-trigger # and check dmesg
>
> during the stalls. The latter command works more reliably.
Sorry for the delay (background: rsync'ing large files from/to a hard disk
in a desktop with 16GB of RAM makes the whole desktop unreponsive)
I just triggered it today (running 3.12), and run sysrq-w:
[ 5547.001505] SysRq : Show Blocked State
[ 5547.001509] task PC stack pid father
[ 5547.001516] btrfs-transacti D ffff880425d7a8a0 0 193 2 0x00000000
[ 5547.001519] ffff880425eede10 0000000000000002 ffff880425eedfd8 0000000000012e40
[ 5547.001521] ffff880425eedfd8 0000000000012e40 ffff880425d7a8a0 ffffea00104baa80
[ 5547.001523] ffff880425eedd90 ffff880425eedd68 ffff880425eedd70 ffffffff81080edd
[ 5547.001525] Call Trace:
[ 5547.001530] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.001533] [<ffffffff81560ed9>] ? sub_preempt_count+0x49/0x50
[ 5547.001535] [<ffffffff8155cc86>] ? _raw_spin_unlock+0x16/0x40
[ 5547.001552] [<ffffffffa008a742>] ? btrfs_run_ordered_operations+0x212/0x2c0 [btrfs]
[ 5547.001554] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.001556] [<ffffffff81560ed9>] ? sub_preempt_count+0x49/0x50
[ 5547.001557] [<ffffffff8155d006>] ? _raw_spin_unlock_irqrestore+0x26/0x60
[ 5547.001559] [<ffffffff8155b719>] schedule+0x29/0x70
[ 5547.001566] [<ffffffffa0072215>] btrfs_commit_transaction+0x265/0x9d0 [btrfs]
[ 5547.001569] [<ffffffff81073d20>] ? wake_up_atomic_t+0x30/0x30
[ 5547.001575] [<ffffffffa006982d>] transaction_kthread+0x19d/0x220 [btrfs]
[ 5547.001581] [<ffffffffa0069690>] ? free_fs_root+0xc0/0xc0 [btrfs]
[ 5547.001583] [<ffffffff81072e70>] kthread+0xc0/0xd0
[ 5547.001585] [<ffffffff81072db0>] ? kthread_create_on_node+0x120/0x120
[ 5547.001587] [<ffffffff81564bac>] ret_from_fork+0x7c/0xb0
[ 5547.001588] [<ffffffff81072db0>] ? kthread_create_on_node+0x120/0x120
[ 5547.001590] systemd-journal D ffff880426e19860 0 234 1 0x00000000
[ 5547.001592] ffff880426d77d90 0000000000000002 ffff880426d77fd8 0000000000012e40
[ 5547.001593] ffff880426d77fd8 0000000000012e40 ffff880426e19860 ffffffff8155d7cd
[ 5547.001595] 0000000000000001 0000000000000001 0000000000000000 ffffffff81572560
[ 5547.001596] Call Trace:
[ 5547.001598] [<ffffffff8155d7cd>] ? retint_restore_args+0xe/0xe
[ 5547.001601] [<ffffffff8122b47b>] ? queue_unplugged+0x3b/0xe0
[ 5547.001602] [<ffffffff8122da9b>] ? blk_flush_plug_list+0x1eb/0x230
[ 5547.001604] [<ffffffff8155b719>] schedule+0x29/0x70
[ 5547.001606] [<ffffffff8155bb88>] schedule_preempt_disabled+0x18/0x30
[ 5547.001607] [<ffffffff8155a2f4>] __mutex_lock_slowpath+0x124/0x1f0
[ 5547.001613] [<ffffffffa0071c9b>] ? btrfs_write_marked_extents+0xbb/0xe0 [btrfs]
[ 5547.001615] [<ffffffff8155a3d7>] mutex_lock+0x17/0x30
[ 5547.001623] [<ffffffffa00ae06a>] btrfs_sync_log+0x22a/0x690 [btrfs]
[ 5547.001630] [<ffffffffa0082f47>] btrfs_sync_file+0x287/0x2e0 [btrfs]
[ 5547.001632] [<ffffffff811abb96>] do_fsync+0x56/0x80
[ 5547.001634] [<ffffffff811abe20>] SyS_fsync+0x10/0x20
[ 5547.001635] [<ffffffff81564e5f>] tracesys+0xdd/0xe2
[ 5547.001644] mysqld D ffff8803f0901860 0 643 579 0x00000000
[ 5547.001645] ffff8803f090de18 0000000000000002 ffff8803f090dfd8 0000000000012e40
[ 5547.001647] ffff8803f090dfd8 0000000000012e40 ffff8803f0901860 ffff88016d038000
[ 5547.001648] ffff880426908d00 0000000024119d80 0000000000000000 0000000000000000
[ 5547.001650] Call Trace:
[ 5547.001657] [<ffffffffa0074d14>] ? btrfs_submit_bio_hook+0x84/0x1f0 [btrfs]
[ 5547.001659] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.001660] [<ffffffff81560ed9>] ? sub_preempt_count+0x49/0x50
[ 5547.001662] [<ffffffff8155d006>] ? _raw_spin_unlock_irqrestore+0x26/0x60
[ 5547.001663] [<ffffffff8155b719>] schedule+0x29/0x70
[ 5547.001669] [<ffffffffa007170f>] wait_current_trans.isra.17+0xbf/0x120 [btrfs]
[ 5547.001671] [<ffffffff81073d20>] ? wake_up_atomic_t+0x30/0x30
[ 5547.001677] [<ffffffffa0072cff>] start_transaction+0x37f/0x570 [btrfs]
[ 5547.001680] [<ffffffff8112632e>] ? do_writepages+0x1e/0x40
[ 5547.001686] [<ffffffffa0072f0b>] btrfs_start_transaction+0x1b/0x20 [btrfs]
[ 5547.001693] [<ffffffffa0082e3f>] btrfs_sync_file+0x17f/0x2e0 [btrfs]
[ 5547.001694] [<ffffffff811abb96>] do_fsync+0x56/0x80
[ 5547.001696] [<ffffffff811abe43>] SyS_fdatasync+0x13/0x20
[ 5547.001697] [<ffffffff81564e5f>] tracesys+0xdd/0xe2
[ 5547.001701] virtuoso-t D ffff88000310b0c0 0 617 609 0x00000000
[ 5547.001702] ffff8803f4867c20 0000000000000002 ffff8803f4867fd8 0000000000012e40
[ 5547.001704] ffff8803f4867fd8 0000000000012e40 ffff88000310b0c0 ffffffff813ce4af
[ 5547.001705] ffffffff81860520 ffff8802d8ad8a00 ffff8803f4867ba0 ffffffff81231a0e
[ 5547.001707] Call Trace:
[ 5547.001709] [<ffffffff813ce4af>] ? scsi_pool_alloc_command+0x3f/0x80
[ 5547.001712] [<ffffffff81231a0e>] ? __blk_segment_map_sg+0x4e/0x120
[ 5547.001713] [<ffffffff81231b6b>] ? blk_rq_map_sg+0x8b/0x1f0
[ 5547.001716] [<ffffffff812481da>] ? cfq_dispatch_requests+0xba/0xc40
[ 5547.001718] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.001721] [<ffffffff81119d70>] ? filemap_fdatawait+0x30/0x30
[ 5547.001722] [<ffffffff8155b719>] schedule+0x29/0x70
[ 5547.001723] [<ffffffff8155b9bf>] io_schedule+0x8f/0xe0
[ 5547.001725] [<ffffffff81119d7e>] sleep_on_page+0xe/0x20
[ 5547.001727] [<ffffffff81559142>] __wait_on_bit+0x62/0x90
[ 5547.001728] [<ffffffff81119b2f>] wait_on_page_bit+0x7f/0x90
[ 5547.001730] [<ffffffff81073da0>] ? wake_atomic_t_function+0x40/0x40
[ 5547.001732] [<ffffffff81119cbb>] filemap_fdatawait_range+0x11b/0x1a0
[ 5547.001734] [<ffffffff8155cc86>] ? _raw_spin_unlock+0x16/0x40
[ 5547.001740] [<ffffffffa0071d47>] btrfs_wait_marked_extents+0x87/0xe0 [btrfs]
[ 5547.001747] [<ffffffffa00ae328>] btrfs_sync_log+0x4e8/0x690 [btrfs]
[ 5547.001754] [<ffffffffa0082f47>] btrfs_sync_file+0x287/0x2e0 [btrfs]
[ 5547.001756] [<ffffffff811abb96>] do_fsync+0x56/0x80
[ 5547.001758] [<ffffffff811abe20>] SyS_fsync+0x10/0x20
[ 5547.001759] [<ffffffff81564e5f>] tracesys+0xdd/0xe2
[ 5547.001761] pool D ffff88040db1c100 0 657 477 0x00000000
[ 5547.001763] ffff8803ee809ba0 0000000000000002 ffff8803ee809fd8 0000000000012e40
[ 5547.001764] ffff8803ee809fd8 0000000000012e40 ffff88040db1c100 0000000000000004
[ 5547.001766] ffff8803ee809ae8 ffffffff8155cc86 ffff8803ee809bd0 ffffffffa005ada4
[ 5547.001767] Call Trace:
[ 5547.001769] [<ffffffff8155cc86>] ? _raw_spin_unlock+0x16/0x40
[ 5547.001775] [<ffffffffa005ada4>] ? reserve_metadata_bytes+0x184/0x930 [btrfs]
[ 5547.001776] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.001778] [<ffffffff81560ed9>] ? sub_preempt_count+0x49/0x50
[ 5547.001779] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.001781] [<ffffffff81560ed9>] ? sub_preempt_count+0x49/0x50
[ 5547.001783] [<ffffffff8155d006>] ? _raw_spin_unlock_irqrestore+0x26/0x60
[ 5547.001784] [<ffffffff8155b719>] schedule+0x29/0x70
[ 5547.001790] [<ffffffffa007170f>] wait_current_trans.isra.17+0xbf/0x120 [btrfs]
[ 5547.001792] [<ffffffff81073d20>] ? wake_up_atomic_t+0x30/0x30
[ 5547.001798] [<ffffffffa0072cff>] start_transaction+0x37f/0x570 [btrfs]
[ 5547.001804] [<ffffffffa0072f0b>] btrfs_start_transaction+0x1b/0x20 [btrfs]
[ 5547.001810] [<ffffffffa0080b8b>] btrfs_create+0x3b/0x200 [btrfs]
[ 5547.001813] [<ffffffff8120ce3c>] ? security_inode_permission+0x1c/0x30
[ 5547.001815] [<ffffffff81189634>] vfs_create+0xb4/0x120
[ 5547.001817] [<ffffffff8118bcd4>] do_last+0x904/0xea0
[ 5547.001818] [<ffffffff81188cc0>] ? link_path_walk+0x70/0x930
[ 5547.001820] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.001822] [<ffffffff8120d0e6>] ? security_file_alloc+0x16/0x20
[ 5547.001824] [<ffffffff8118c32b>] path_openat+0xbb/0x6b0
[ 5547.001827] [<ffffffff810dd64f>] ? __acct_update_integrals+0x7f/0x100
[ 5547.001829] [<ffffffff81085782>] ? account_system_time+0xa2/0x180
[ 5547.001831] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.001833] [<ffffffff8118d7ca>] do_filp_open+0x3a/0x90
[ 5547.001834] [<ffffffff8155cc86>] ? _raw_spin_unlock+0x16/0x40
[ 5547.001836] [<ffffffff81199e47>] ? __alloc_fd+0xa7/0x130
[ 5547.001839] [<ffffffff8117ce89>] do_sys_open+0x129/0x220
[ 5547.001842] [<ffffffff8100e795>] ? syscall_trace_enter+0x135/0x230
[ 5547.001844] [<ffffffff8117cf9e>] SyS_open+0x1e/0x20
[ 5547.001845] [<ffffffff81564e5f>] tracesys+0xdd/0xe2
[ 5547.001850] akregator D ffff8803ed1d4100 0 875 1 0x00000000
[ 5547.001851] ffff8803c7f1bba0 0000000000000002 ffff8803c7f1bfd8 0000000000012e40
[ 5547.001853] ffff8803c7f1bfd8 0000000000012e40 ffff8803ed1d4100 0000000000000004
[ 5547.001854] ffff8803c7f1bae8 ffffffff8155cc86 ffff8803c7f1bbd0 ffffffffa005ada4
[ 5547.001856] Call Trace:
[ 5547.001858] [<ffffffff8155cc86>] ? _raw_spin_unlock+0x16/0x40
[ 5547.001863] [<ffffffffa005ada4>] ? reserve_metadata_bytes+0x184/0x930 [btrfs]
[ 5547.001865] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.001866] [<ffffffff81560ed9>] ? sub_preempt_count+0x49/0x50
[ 5547.001868] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.001870] [<ffffffff81560ed9>] ? sub_preempt_count+0x49/0x50
[ 5547.001871] [<ffffffff8155d006>] ? _raw_spin_unlock_irqrestore+0x26/0x60
[ 5547.001873] [<ffffffff8155b719>] schedule+0x29/0x70
[ 5547.001879] [<ffffffffa007170f>] wait_current_trans.isra.17+0xbf/0x120 [btrfs]
[ 5547.001881] [<ffffffff81073d20>] ? wake_up_atomic_t+0x30/0x30
[ 5547.001886] [<ffffffffa0072cff>] start_transaction+0x37f/0x570 [btrfs]
[ 5547.001888] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.001894] [<ffffffffa0072f0b>] btrfs_start_transaction+0x1b/0x20 [btrfs]
[ 5547.001900] [<ffffffffa0080b8b>] btrfs_create+0x3b/0x200 [btrfs]
[ 5547.001902] [<ffffffff8120ce3c>] ? security_inode_permission+0x1c/0x30
[ 5547.001904] [<ffffffff81189634>] vfs_create+0xb4/0x120
[ 5547.001906] [<ffffffff8118bcd4>] do_last+0x904/0xea0
[ 5547.001907] [<ffffffff81188cc0>] ? link_path_walk+0x70/0x930
[ 5547.001909] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.001911] [<ffffffff8120d0e6>] ? security_file_alloc+0x16/0x20
[ 5547.001912] [<ffffffff8118c32b>] path_openat+0xbb/0x6b0
[ 5547.001914] [<ffffffff810dd64f>] ? __acct_update_integrals+0x7f/0x100
[ 5547.001916] [<ffffffff81085782>] ? account_system_time+0xa2/0x180
[ 5547.001918] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.001920] [<ffffffff8118d7ca>] do_filp_open+0x3a/0x90
[ 5547.001921] [<ffffffff8155cc86>] ? _raw_spin_unlock+0x16/0x40
[ 5547.001923] [<ffffffff81199e47>] ? __alloc_fd+0xa7/0x130
[ 5547.001925] [<ffffffff8117ce89>] do_sys_open+0x129/0x220
[ 5547.001927] [<ffffffff8100e795>] ? syscall_trace_enter+0x135/0x230
[ 5547.001928] [<ffffffff8117cf9e>] SyS_open+0x1e/0x20
[ 5547.001930] [<ffffffff81564e5f>] tracesys+0xdd/0xe2
[ 5547.001931] mpegaudioparse3 D ffff880341d10820 0 5917 1 0x00000000
[ 5547.001933] ffff88030f779ce0 0000000000000002 ffff88030f779fd8 0000000000012e40
[ 5547.001934] ffff88030f779fd8 0000000000012e40 ffff880341d10820 ffffffff81122a28
[ 5547.001936] ffff88043e5ddc00 ffff880400000002 ffff88043e2138d0 0000000000000000
[ 5547.001938] Call Trace:
[ 5547.001939] [<ffffffff81122a28>] ? __alloc_pages_nodemask+0x158/0xb00
[ 5547.001941] [<ffffffff8102af55>] ? native_send_call_func_single_ipi+0x35/0x40
[ 5547.001943] [<ffffffff810b31a8>] ? generic_exec_single+0x98/0xa0
[ 5547.001945] [<ffffffff81086a18>] ? __enqueue_entity+0x78/0x80
[ 5547.001947] [<ffffffff8108a837>] ? enqueue_entity+0x197/0x780
[ 5547.001948] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.001950] [<ffffffff81119d90>] ? sleep_on_page+0x20/0x20
[ 5547.001951] [<ffffffff8155b719>] schedule+0x29/0x70
[ 5547.001953] [<ffffffff8155b9bf>] io_schedule+0x8f/0xe0
[ 5547.001954] [<ffffffff81119d9e>] sleep_on_page_killable+0xe/0x40
[ 5547.001956] [<ffffffff8155925d>] __wait_on_bit_lock+0x5d/0xc0
[ 5547.001958] [<ffffffff81119f2a>] __lock_page_killable+0x6a/0x70
[ 5547.001960] [<ffffffff81073da0>] ? wake_atomic_t_function+0x40/0x40
[ 5547.001961] [<ffffffff8111b9e5>] generic_file_aio_read+0x435/0x700
[ 5547.001963] [<ffffffff8117d2ba>] do_sync_read+0x5a/0x90
[ 5547.001965] [<ffffffff8117d85a>] vfs_read+0x9a/0x170
[ 5547.001967] [<ffffffff8117e039>] SyS_read+0x49/0xa0
[ 5547.001968] [<ffffffff81564e5f>] tracesys+0xdd/0xe2
[ 5547.001970] mozStorage #2 D ffff8803b7aa1860 0 920 477 0x00000000
[ 5547.001972] ffff8803b1473d80 0000000000000002 ffff8803b1473fd8 0000000000012e40
[ 5547.001974] ffff8803b1473fd8 0000000000012e40 ffff8803b7aa1860 0000000000000004
[ 5547.001975] ffff8803b1473cc8 ffffffff8155cc86 ffff8803b1473db0 ffffffffa005ada4
[ 5547.001977] Call Trace:
[ 5547.001978] [<ffffffff8155cc86>] ? _raw_spin_unlock+0x16/0x40
[ 5547.001984] [<ffffffffa005ada4>] ? reserve_metadata_bytes+0x184/0x930 [btrfs]
[ 5547.001990] [<ffffffffa0084729>] ? __btrfs_buffered_write+0x3d9/0x490 [btrfs]
[ 5547.001992] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.001994] [<ffffffff81560ed9>] ? sub_preempt_count+0x49/0x50
[ 5547.001995] [<ffffffff8155d006>] ? _raw_spin_unlock_irqrestore+0x26/0x60
[ 5547.001997] [<ffffffff8155b719>] schedule+0x29/0x70
[ 5547.002003] [<ffffffffa007170f>] wait_current_trans.isra.17+0xbf/0x120 [btrfs]
[ 5547.002004] [<ffffffff81073d20>] ? wake_up_atomic_t+0x30/0x30
[ 5547.002010] [<ffffffffa0072cff>] start_transaction+0x37f/0x570 [btrfs]
[ 5547.002016] [<ffffffffa0072f0b>] btrfs_start_transaction+0x1b/0x20 [btrfs]
[ 5547.002023] [<ffffffffa007c8a1>] btrfs_setattr+0x101/0x290 [btrfs]
[ 5547.002025] [<ffffffff810d675c>] ? rcu_eqs_enter+0x5c/0xa0
[ 5547.002027] [<ffffffff81198a6c>] notify_change+0x1dc/0x360
[ 5547.002029] [<ffffffff81560ed9>] ? sub_preempt_count+0x49/0x50
[ 5547.002030] [<ffffffff8117bdcb>] do_truncate+0x6b/0xa0
[ 5547.002032] [<ffffffff8117f8b9>] ? __sb_start_write+0x49/0x100
[ 5547.002033] [<ffffffff8117c12b>] SyS_ftruncate+0x10b/0x160
[ 5547.002035] [<ffffffff81564e5f>] tracesys+0xdd/0xe2
[ 5547.002036] Cache I/O D ffff8803b7aa28a0 0 922 477 0x00000000
[ 5547.002038] ffff8803b1495e18 0000000000000002 ffff8803b1495fd8 0000000000012e40
[ 5547.002039] ffff8803b1495fd8 0000000000012e40 ffff8803b7aa28a0 ffff8803b1495e08
[ 5547.002041] ffff8803b1495db0 ffffffff8111a25a ffff8803b1495e40 ffff8803b1495df0
[ 5547.002043] Call Trace:
[ 5547.002045] [<ffffffff8111a25a>] ? find_get_pages_tag+0xea/0x180
[ 5547.002047] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.002048] [<ffffffff81560ed9>] ? sub_preempt_count+0x49/0x50
[ 5547.002050] [<ffffffff8155d006>] ? _raw_spin_unlock_irqrestore+0x26/0x60
[ 5547.002051] [<ffffffff8155b719>] schedule+0x29/0x70
[ 5547.002057] [<ffffffffa007170f>] wait_current_trans.isra.17+0xbf/0x120 [btrfs]
[ 5547.002059] [<ffffffff81073d20>] ? wake_up_atomic_t+0x30/0x30
[ 5547.002065] [<ffffffffa0072cff>] start_transaction+0x37f/0x570 [btrfs]
[ 5547.002071] [<ffffffffa0072f0b>] btrfs_start_transaction+0x1b/0x20 [btrfs]
[ 5547.002077] [<ffffffffa0082e3f>] btrfs_sync_file+0x17f/0x2e0 [btrfs]
[ 5547.002079] [<ffffffff811abb96>] do_fsync+0x56/0x80
[ 5547.002080] [<ffffffff811abe20>] SyS_fsync+0x10/0x20
[ 5547.002081] [<ffffffff81564e5f>] tracesys+0xdd/0xe2
[ 5547.002083] mozStorage #6 D ffff8803c0cfa8a0 0 982 477 0x00000000
[ 5547.002085] ffff8803a10f5ba0 0000000000000002 ffff8803a10f5fd8 0000000000012e40
[ 5547.002086] ffff8803a10f5fd8 0000000000012e40 ffff8803c0cfa8a0 0000000000000004
[ 5547.002088] ffff8803a10f5ae8 ffffffff8155cc86 ffff8803a10f5bd0 ffffffffa005ada4
[ 5547.002089] Call Trace:
[ 5547.002091] [<ffffffff8155cc86>] ? _raw_spin_unlock+0x16/0x40
[ 5547.002096] [<ffffffffa005ada4>] ? reserve_metadata_bytes+0x184/0x930 [btrfs]
[ 5547.002098] [<ffffffff8102b067>] ? native_smp_send_reschedule+0x47/0x60
[ 5547.002100] [<ffffffff8107f7bc>] ? resched_task+0x5c/0x60
[ 5547.002101] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.002103] [<ffffffff81560ed9>] ? sub_preempt_count+0x49/0x50
[ 5547.002104] [<ffffffff8155d006>] ? _raw_spin_unlock_irqrestore+0x26/0x60
[ 5547.002106] [<ffffffff8155b719>] schedule+0x29/0x70
[ 5547.002112] [<ffffffffa007170f>] wait_current_trans.isra.17+0xbf/0x120 [btrfs]
[ 5547.002113] [<ffffffff81073d20>] ? wake_up_atomic_t+0x30/0x30
[ 5547.002119] [<ffffffffa0072cff>] start_transaction+0x37f/0x570 [btrfs]
[ 5547.002125] [<ffffffffa0072f0b>] btrfs_start_transaction+0x1b/0x20 [btrfs]
[ 5547.002131] [<ffffffffa0080b8b>] btrfs_create+0x3b/0x200 [btrfs]
[ 5547.002133] [<ffffffff8120ce3c>] ? security_inode_permission+0x1c/0x30
[ 5547.002134] [<ffffffff81189634>] vfs_create+0xb4/0x120
[ 5547.002136] [<ffffffff8118bcd4>] do_last+0x904/0xea0
[ 5547.002138] [<ffffffff81188cc0>] ? link_path_walk+0x70/0x930
[ 5547.002139] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.002141] [<ffffffff8120d0e6>] ? security_file_alloc+0x16/0x20
[ 5547.002143] [<ffffffff8118c32b>] path_openat+0xbb/0x6b0
[ 5547.002145] [<ffffffff810dd64f>] ? __acct_update_integrals+0x7f/0x100
[ 5547.002147] [<ffffffff81085782>] ? account_system_time+0xa2/0x180
[ 5547.002148] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.002150] [<ffffffff8118d7ca>] do_filp_open+0x3a/0x90
[ 5547.002152] [<ffffffff8155cc86>] ? _raw_spin_unlock+0x16/0x40
[ 5547.002153] [<ffffffff81199e47>] ? __alloc_fd+0xa7/0x130
[ 5547.002155] [<ffffffff8117ce89>] do_sys_open+0x129/0x220
[ 5547.002157] [<ffffffff8100e795>] ? syscall_trace_enter+0x135/0x230
[ 5547.002159] [<ffffffff8117cf9e>] SyS_open+0x1e/0x20
[ 5547.002160] [<ffffffff81564e5f>] tracesys+0xdd/0xe2
[ 5547.002164] rsync D ffff8802dcde0820 0 5803 5802 0x00000000
[ 5547.002165] ffff8802daeb1a90 0000000000000002 ffff8802daeb1fd8 0000000000012e40
[ 5547.002167] ffff8802daeb1fd8 0000000000012e40 ffff8802dcde0820 ffff880100000002
[ 5547.002169] ffff8802daeb19e0 ffffffff81080edd ffff880308b337e0 0000000000000000
[ 5547.002170] Call Trace:
[ 5547.002172] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.002173] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.002175] [<ffffffff81560ed9>] ? sub_preempt_count+0x49/0x50
[ 5547.002177] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.002178] [<ffffffff81560e8d>] ? add_preempt_count+0x3d/0x40
[ 5547.002180] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.002181] [<ffffffff8155b719>] schedule+0x29/0x70
[ 5547.002182] [<ffffffff81558f6a>] schedule_timeout+0x11a/0x230
[ 5547.002185] [<ffffffff8105e0c0>] ? detach_if_pending+0x120/0x120
[ 5547.002187] [<ffffffff810a5078>] ? ktime_get_ts+0x48/0xe0
[ 5547.002189] [<ffffffff8155bd2b>] io_schedule_timeout+0x9b/0xf0
[ 5547.002191] [<ffffffff811259a9>] balance_dirty_pages_ratelimited+0x3d9/0xa10
[ 5547.002198] [<ffffffffa0c9ad84>] ? ext4_dirty_inode+0x54/0x60 [ext4]
[ 5547.002200] [<ffffffff8111a8c8>] generic_file_buffered_write+0x1b8/0x290
[ 5547.002202] [<ffffffff8111bfd9>] __generic_file_aio_write+0x1a9/0x3b0
[ 5547.002203] [<ffffffff8111c238>] generic_file_aio_write+0x58/0xa0
[ 5547.002208] [<ffffffffa0c8ef79>] ext4_file_write+0x99/0x3e0 [ext4]
[ 5547.002210] [<ffffffff810ddaac>] ? acct_account_cputime+0x1c/0x20
[ 5547.002212] [<ffffffff81085782>] ? account_system_time+0xa2/0x180
[ 5547.002213] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.002215] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.002216] [<ffffffff8117d34a>] do_sync_write+0x5a/0x90
[ 5547.002218] [<ffffffff8117d9ed>] vfs_write+0xbd/0x1e0
[ 5547.002220] [<ffffffff8117e0d9>] SyS_write+0x49/0xa0
[ 5547.002221] [<ffffffff81564e5f>] tracesys+0xdd/0xe2
[ 5547.002223] ktorrent D ffff8802e7680820 0 5806 1 0x00000000
[ 5547.002224] ffff8802daf7fba0 0000000000000002 ffff8802daf7ffd8 0000000000012e40
[ 5547.002226] ffff8802daf7ffd8 0000000000012e40 ffff8802e7680820 0000000000000004
[ 5547.002227] ffff8802daf7fae8 ffffffff8155cc86 ffff8802daf7fbd0 ffffffffa005ada4
[ 5547.002229] Call Trace:
[ 5547.002230] [<ffffffff8155cc86>] ? _raw_spin_unlock+0x16/0x40
[ 5547.002236] [<ffffffffa005ada4>] ? reserve_metadata_bytes+0x184/0x930 [btrfs]
[ 5547.002241] [<ffffffffa004ae49>] ? btrfs_set_path_blocking+0x39/0x80 [btrfs]
[ 5547.002246] [<ffffffffa004fe78>] ? btrfs_search_slot+0x498/0x970 [btrfs]
[ 5547.002247] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.002249] [<ffffffff81560ed9>] ? sub_preempt_count+0x49/0x50
[ 5547.002251] [<ffffffff8155d006>] ? _raw_spin_unlock_irqrestore+0x26/0x60
[ 5547.002252] [<ffffffff8155b719>] schedule+0x29/0x70
[ 5547.002258] [<ffffffffa007170f>] wait_current_trans.isra.17+0xbf/0x120 [btrfs]
[ 5547.002260] [<ffffffff81073d20>] ? wake_up_atomic_t+0x30/0x30
[ 5547.002266] [<ffffffffa0072cff>] start_transaction+0x37f/0x570 [btrfs]
[ 5547.002268] [<ffffffff81560ed9>] ? sub_preempt_count+0x49/0x50
[ 5547.002273] [<ffffffffa0072f0b>] btrfs_start_transaction+0x1b/0x20 [btrfs]
[ 5547.002280] [<ffffffffa0080b8b>] btrfs_create+0x3b/0x200 [btrfs]
[ 5547.002281] [<ffffffff8120ce3c>] ? security_inode_permission+0x1c/0x30
[ 5547.002283] [<ffffffff81189634>] vfs_create+0xb4/0x120
[ 5547.002285] [<ffffffff8118bcd4>] do_last+0x904/0xea0
[ 5547.002287] [<ffffffff81188cc0>] ? link_path_walk+0x70/0x930
[ 5547.002288] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.002290] [<ffffffff8120d0e6>] ? security_file_alloc+0x16/0x20
[ 5547.002292] [<ffffffff8118c32b>] path_openat+0xbb/0x6b0
[ 5547.002293] [<ffffffff810dd64f>] ? __acct_update_integrals+0x7f/0x100
[ 5547.002295] [<ffffffff81085782>] ? account_system_time+0xa2/0x180
[ 5547.002297] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.002299] [<ffffffff8118d7ca>] do_filp_open+0x3a/0x90
[ 5547.002300] [<ffffffff8155cc86>] ? _raw_spin_unlock+0x16/0x40
[ 5547.002302] [<ffffffff81199e47>] ? __alloc_fd+0xa7/0x130
[ 5547.002304] [<ffffffff8117ce89>] do_sys_open+0x129/0x220
[ 5547.002306] [<ffffffff8100e795>] ? syscall_trace_enter+0x135/0x230
[ 5547.002307] [<ffffffff8117cf9e>] SyS_open+0x1e/0x20
[ 5547.002309] [<ffffffff81564e5f>] tracesys+0xdd/0xe2
[ 5547.002311] kworker/u16:0 D ffff88035c5ac920 0 6043 2 0x00000000
[ 5547.002313] Workqueue: writeback bdi_writeback_workfn (flush-8:32)
[ 5547.002315] ffff88036c9cb898 0000000000000002 ffff88036c9cbfd8 0000000000012e40
[ 5547.002316] ffff88036c9cbfd8 0000000000012e40 ffff88035c5ac920 ffff8804281de048
[ 5547.002318] ffff88036c9cb7e8 ffffffff81080edd 0000000000000001 ffff88036c9cb800
[ 5547.002319] Call Trace:
[ 5547.002321] [<ffffffff81080edd>] ? get_parent_ip+0xd/0x50
[ 5547.002323] [<ffffffff81560ed9>] ? sub_preempt_count+0x49/0x50
[ 5547.002324] [<ffffffff8155cc86>] ? _raw_spin_unlock+0x16/0x40
[ 5547.002326] [<ffffffff8122b47b>] ? queue_unplugged+0x3b/0xe0
[ 5547.002328] [<ffffffff8155b719>] schedule+0x29/0x70
[ 5547.002329] [<ffffffff8155b9bf>] io_schedule+0x8f/0xe0
[ 5547.002331] [<ffffffff8122b8aa>] get_request+0x1aa/0x780
[ 5547.002332] [<ffffffff8123099e>] ? ioc_lookup_icq+0x4e/0x80
[ 5547.002334] [<ffffffff81073d20>] ? wake_up_atomic_t+0x30/0x30
[ 5547.002336] [<ffffffff8122db58>] blk_queue_bio+0x78/0x3e0
[ 5547.002337] [<ffffffff8122c5c2>] generic_make_request+0xc2/0x110
[ 5547.002338] [<ffffffff8122c683>] submit_bio+0x73/0x160
[ 5547.002344] [<ffffffffa0c9bae5>] ext4_io_submit+0x25/0x50 [ext4]
[ 5547.002348] [<ffffffffa0c981d3>] ext4_writepages+0x823/0xe00 [ext4]
[ 5547.002350] [<ffffffff8112632e>] do_writepages+0x1e/0x40
[ 5547.002352] [<ffffffff811a6340>] __writeback_single_inode+0x40/0x330
[ 5547.002353] [<ffffffff811a7392>] writeback_sb_inodes+0x262/0x450
[ 5547.002355] [<ffffffff811a761f>] __writeback_inodes_wb+0x9f/0xd0
[ 5547.002357] [<ffffffff811a797b>] wb_writeback+0x32b/0x360
[ 5547.002358] [<ffffffff811a8111>] bdi_writeback_workfn+0x221/0x510
[ 5547.002361] [<ffffffff8106b917>] process_one_work+0x167/0x450
[ 5547.002362] [<ffffffff8106c6a1>] worker_thread+0x121/0x3a0
[ 5547.002364] [<ffffffff81560ed9>] ? sub_preempt_count+0x49/0x50
[ 5547.002366] [<ffffffff8106c580>] ? manage_workers.isra.25+0x2a0/0x2a0
[ 5547.002367] [<ffffffff81072e70>] kthread+0xc0/0xd0
[ 5547.002369] [<ffffffff81072db0>] ? kthread_create_on_node+0x120/0x120
[ 5547.002371] [<ffffffff81564bac>] ret_from_fork+0x7c/0xb0
[ 5547.002372] [<ffffffff81072db0>] ? kthread_create_on_node+0x120/0x120
--
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