I tried out -next to test the mm fixes, and immediately upon mounting my array (11TB, 98% full at the time) the btrfs-transaction thread for it spun at 100% CPU.
It acted like read-only, write-discarding media - deleted files reappeared after a reboot every time. I'm not sure about writes, since it's running the crashplan backup target service - that resynchronizes, but I don't know enough about it to see if it complained about writes vanishing. I tried multiple reboots before going back to 4.6.7, where everything worked properly. 4.7 BTRFS works as well, but I was hitting the mm bug that OOMs improperly under high IO loads. The topology is 4x4GB drives in md-raid5, bcache'd with a 256gb SSD, btrfs on the bcache0 block device. (apologies for the quote, only way to convince Thunderbird to not mangle log files) > Aug 19 04:53:22 fileserver kernel: [ 605.152050] INFO: task kworker/u4:1:22 > blocked for more than 120 seconds. > Aug 19 04:53:22 fileserver kernel: [ 605.152097] Not tainted > 4.8.0-rc2-next-20160818 #15 > Aug 19 04:53:22 fileserver kernel: [ 605.152138] "echo 0 > > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > Aug 19 04:53:22 fileserver kernel: [ 605.152175] kworker/u4:1 D > ffff88022666bad8 0 22 2 0x00000000 > Aug 19 04:53:22 fileserver kernel: [ 605.152286] Workqueue: btrfs-submit > btrfs_submit_helper > Aug 19 04:53:22 fileserver kernel: [ 605.152357] ffff88022666bad8 > ffffffff81a65800 ffff880179694040 ffff880226666100 > Aug 19 04:53:22 fileserver kernel: [ 605.152521] ffff88022666bae0 > ffff88022666c000 ffff880220510ac0 ffff88022666bb10 > Aug 19 04:53:22 fileserver kernel: [ 605.152688] ffff880220510ad8 > ffff880220510000 ffff88022666baf0 ffffffff81888bfa > Aug 19 04:53:22 fileserver kernel: [ 605.152851] Call Trace: > Aug 19 04:53:22 fileserver kernel: [ 605.152892] [<ffffffff81888bfa>] > schedule+0x3a/0x90 > Aug 19 04:53:22 fileserver kernel: [ 605.152929] [<ffffffff8188af15>] > rwsem_down_read_failed+0xe5/0x120 > Aug 19 04:53:22 fileserver kernel: [ 605.152970] [<ffffffff81489008>] > call_rwsem_down_read_failed+0x18/0x30 > Aug 19 04:53:22 fileserver kernel: [ 605.153006] [<ffffffff8188a842>] > down_read+0x12/0x30 > Aug 19 04:53:22 fileserver kernel: [ 605.153047] [<ffffffff8167757e>] > cached_dev_make_request+0x65e/0xd90 > Aug 19 04:53:22 fileserver kernel: [ 605.153083] [<ffffffff81457f8d>] > generic_make_request+0xdd/0x190 > Aug 19 04:53:22 fileserver kernel: [ 605.153122] [<ffffffff814580b5>] > submit_bio+0x75/0x140 > Aug 19 04:53:22 fileserver kernel: [ 605.153159] [<ffffffff8114610d>] ? > mempool_free+0x2d/0x90 > Aug 19 04:53:22 fileserver kernel: [ 605.153202] [<ffffffff810832a1>] ? > preempt_count_sub+0x51/0x80 > Aug 19 04:53:22 fileserver kernel: [ 605.153240] [<ffffffff813a5d58>] > run_scheduled_bios+0x258/0x580 > Aug 19 04:53:22 fileserver kernel: [ 605.153283] [<ffffffff8139f482>] ? > end_bio_extent_readpage+0x202/0x5b0 > Aug 19 04:53:22 fileserver kernel: [ 605.153322] [<ffffffff813a6090>] > pending_bios_fn+0x10/0x20 > Aug 19 04:53:22 fileserver kernel: [ 605.153363] [<ffffffff813b0f87>] > btrfs_scrubparity_helper+0x77/0x340 > Aug 19 04:53:22 fileserver kernel: [ 605.153403] [<ffffffff813b1359>] > btrfs_submit_helper+0x9/0x10 > Aug 19 04:53:22 fileserver kernel: [ 605.153446] [<ffffffff81076170>] > process_one_work+0x1e0/0x480 > Aug 19 04:53:22 fileserver kernel: [ 605.153484] [<ffffffff81076453>] > worker_thread+0x43/0x4e0 > Aug 19 04:53:22 fileserver kernel: [ 605.153526] [<ffffffff81076410>] ? > process_one_work+0x480/0x480 > Aug 19 04:53:22 fileserver kernel: [ 605.153564] [<ffffffff8107bc94>] > kthread+0xc4/0xe0 > Aug 19 04:53:22 fileserver kernel: [ 605.153607] [<ffffffff8188cddf>] > ret_from_fork+0x1f/0x40 > Aug 19 04:53:22 fileserver kernel: [ 605.153644] [<ffffffff8107bbd0>] ? > kthread_worker_fn+0x110/0x110 > Aug 19 04:53:22 fileserver kernel: [ 605.153701] INFO: task > bcache_writebac:972 blocked for more than 120 seconds. > Aug 19 04:53:22 fileserver kernel: [ 605.153740] Not tainted > 4.8.0-rc2-next-20160818 #15 > Aug 19 04:53:22 fileserver kernel: [ 605.153780] "echo 0 > > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > Aug 19 04:53:22 fileserver kernel: [ 605.153822] bcache_writebac D > ffff880220bc3cd8 0 972 2 0x00000000 > Aug 19 04:53:22 fileserver kernel: [ 605.153929] ffff880220bc3cd8 > ffff880220bc3cb0 ffffffff81083200 ffff8802248642c0 > Aug 19 04:53:22 fileserver kernel: [ 605.154100] ffff880220510000 > ffff880220bc4000 ffff880220510ac0 ffff880220510ac0 > Aug 19 04:53:22 fileserver kernel: [ 605.154274] ffff880220510ad8 > ffffffff00000001 ffff880220bc3cf0 ffffffff81888bfa > Aug 19 04:53:22 fileserver kernel: [ 605.154443] Call Trace: > Aug 19 04:53:22 fileserver kernel: [ 605.154484] [<ffffffff81083200>] ? > finish_task_switch+0x180/0x1d0 > Aug 19 04:53:22 fileserver kernel: [ 605.154522] [<ffffffff81888bfa>] > schedule+0x3a/0x90 > Aug 19 04:53:22 fileserver kernel: [ 605.154563] [<ffffffff8188b059>] > rwsem_down_write_failed+0x109/0x280 > Aug 19 04:53:22 fileserver kernel: [ 605.154602] [<ffffffff81489037>] > call_rwsem_down_write_failed+0x17/0x30 > Aug 19 04:53:22 fileserver kernel: [ 605.154644] [<ffffffff81888c04>] ? > schedule+0x44/0x90 > Aug 19 04:53:22 fileserver kernel: [ 605.154681] [<ffffffff8188a87f>] > down_write+0x1f/0x30 > Aug 19 04:53:22 fileserver kernel: [ 605.154723] [<ffffffff81683ccc>] > bch_writeback_thread+0x5c/0x8a0 > Aug 19 04:53:22 fileserver kernel: [ 605.154762] [<ffffffff81683c70>] ? > write_dirty+0xb0/0xb0 > Aug 19 04:53:22 fileserver kernel: [ 605.154803] [<ffffffff8107bc94>] > kthread+0xc4/0xe0 > Aug 19 04:53:22 fileserver kernel: [ 605.154841] [<ffffffff8188cddf>] > ret_from_fork+0x1f/0x40 > Aug 19 04:53:22 fileserver kernel: [ 605.154882] [<ffffffff8107bbd0>] ? > kthread_worker_fn+0x110/0x110 > Aug 19 04:53:22 fileserver kernel: [ 605.154967] INFO: task java:4669 > blocked for more than 120 seconds. > Aug 19 04:53:22 fileserver kernel: [ 605.155005] Not tainted > 4.8.0-rc2-next-20160818 #15 > Aug 19 04:53:22 fileserver kernel: [ 605.155045] "echo 0 > > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > Aug 19 04:53:22 fileserver kernel: [ 605.155086] java D > ffff88014d91fb08 0 4669 1 0x00000000 > Aug 19 04:53:22 fileserver kernel: [ 605.155193] ffff88014d91fb08 > ffff88014d920000 ffff88014d91fa00 ffff88014d8da140 > Aug 19 04:53:22 fileserver kernel: [ 605.155362] ffff88022585a0b8 > ffff88014d920000 ffff88022fc17900 7fffffffffffffff > Aug 19 04:53:22 fileserver kernel: [ 605.155534] ffffffff818894d0 > ffff88014d91fc60 ffff88014d91fb20 ffffffff81888bfa > Aug 19 04:53:22 fileserver kernel: [ 605.155705] Call Trace: > Aug 19 04:53:22 fileserver kernel: [ 605.155745] [<ffffffff818894d0>] ? > bit_wait+0x60/0x60 > Aug 19 04:53:22 fileserver kernel: [ 605.155783] [<ffffffff81888bfa>] > schedule+0x3a/0x90 > Aug 19 04:53:22 fileserver kernel: [ 605.155824] [<ffffffff8188b83e>] > schedule_timeout+0x2de/0x420 > Aug 19 04:53:22 fileserver kernel: [ 605.155862] [<ffffffff8188c511>] ? > _raw_spin_unlock+0x11/0x30 > Aug 19 04:53:22 fileserver kernel: [ 605.155903] [<ffffffff8188c511>] ? > _raw_spin_unlock+0x11/0x30 > Aug 19 04:53:22 fileserver kernel: [ 605.155942] [<ffffffff8135e695>] ? > can_overcommit.part.35+0xc5/0x110 > Aug 19 04:53:22 fileserver kernel: [ 605.155984] [<ffffffff810c1c9d>] ? > ktime_get+0x4d/0xc0 > Aug 19 04:53:22 fileserver kernel: [ 605.156052] [<ffffffff818894d0>] ? > bit_wait+0x60/0x60 > Aug 19 04:53:22 fileserver kernel: [ 605.156090] [<ffffffff818883ef>] > io_schedule_timeout+0x9f/0x110 > Aug 19 04:53:22 fileserver kernel: [ 605.156128] [<ffffffff818894e6>] > bit_wait_io+0x16/0x60 > Aug 19 04:53:22 fileserver kernel: [ 605.156166] [<ffffffff818891d3>] > __wait_on_bit+0x53/0x80 > Aug 19 04:53:22 fileserver kernel: [ 605.156204] [<ffffffff81142192>] > wait_on_page_bit+0xb2/0xc0 > Aug 19 04:53:22 fileserver kernel: [ 605.156242] [<ffffffff8109b9d0>] ? > autoremove_wake_function+0x30/0x30 > Aug 19 04:53:22 fileserver kernel: [ 605.156280] [<ffffffff81391a73>] > prepare_pages+0x163/0x1e0 > Aug 19 04:53:22 fileserver kernel: [ 605.156318] [<ffffffff813922b3>] > __btrfs_buffered_write.isra.4+0x1f3/0x6e0 > Aug 19 04:53:22 fileserver kernel: [ 605.156357] [<ffffffff81395d46>] > btrfs_file_write_iter+0x186/0x570 > Aug 19 04:53:22 fileserver kernel: [ 605.156396] [<ffffffff811ba751>] > __vfs_write+0xc1/0x120 > Aug 19 04:53:22 fileserver kernel: [ 605.156434] [<ffffffff811bb45f>] > vfs_write+0xbf/0x1a0 > Aug 19 04:53:22 fileserver kernel: [ 605.156471] [<ffffffff811bc84a>] > SyS_write+0x4a/0xb0 > Aug 19 04:53:22 fileserver kernel: [ 605.156509] [<ffffffff8188cba9>] > entry_SYSCALL_64_fastpath+0x1c/0xa7 > Aug 19 04:53:22 fileserver kernel: [ 605.159736] INFO: task java:4691 > blocked for more than 120 seconds. > Aug 19 04:53:22 fileserver kernel: [ 605.159785] Not tainted > 4.8.0-rc2-next-20160818 #15 > Aug 19 04:53:22 fileserver kernel: [ 605.159829] "echo 0 > > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > Aug 19 04:53:22 fileserver kernel: [ 605.159870] java D > ffff880147f0bb08 0 4691 1 0x00000000 > Aug 19 04:53:22 fileserver kernel: [ 605.159978] ffff880147f0bb08 > ffff880155d2e578 ffff88014d996040 ffff880147f021c0 > Aug 19 04:53:22 fileserver kernel: [ 605.160171] ffffffff8188c511 > ffff880147f0c000 ffff88022fd17900 7fffffffffffffff > Aug 19 04:53:22 fileserver kernel: [ 605.160333] ffffffff818894d0 > ffff880147f0bc60 ffff880147f0bb20 ffffffff81888bfa > Aug 19 04:53:22 fileserver kernel: [ 605.160839] Call Trace: > Aug 19 04:53:22 fileserver kernel: [ 605.160885] [<ffffffff8188c511>] ? > _raw_spin_unlock+0x11/0x30 > Aug 19 04:53:22 fileserver kernel: [ 605.160923] [<ffffffff818894d0>] ? > bit_wait+0x60/0x60 > Aug 19 04:53:22 fileserver kernel: [ 605.160965] [<ffffffff81888bfa>] > schedule+0x3a/0x90 > Aug 19 04:53:22 fileserver kernel: [ 605.161002] [<ffffffff8188b83e>] > schedule_timeout+0x2de/0x420 > Aug 19 04:53:22 fileserver kernel: [ 605.161044] [<ffffffff8188c511>] ? > _raw_spin_unlock+0x11/0x30 > Aug 19 04:53:22 fileserver kernel: [ 605.161082] [<ffffffff8188c511>] ? > _raw_spin_unlock+0x11/0x30 > Aug 19 04:53:22 fileserver kernel: [ 605.161124] [<ffffffff8135e695>] ? > can_overcommit.part.35+0xc5/0x110 > Aug 19 04:53:22 fileserver kernel: [ 605.161163] [<ffffffff810c1c9d>] ? > ktime_get+0x4d/0xc0 > Aug 19 04:53:22 fileserver kernel: [ 605.161204] [<ffffffff818894d0>] ? > bit_wait+0x60/0x60 > Aug 19 04:53:22 fileserver kernel: [ 605.161241] [<ffffffff818883ef>] > io_schedule_timeout+0x9f/0x110 > Aug 19 04:53:22 fileserver kernel: [ 605.161283] [<ffffffff818894e6>] > bit_wait_io+0x16/0x60 > Aug 19 04:53:22 fileserver kernel: [ 605.161321] [<ffffffff818891d3>] > __wait_on_bit+0x53/0x80 > Aug 19 04:53:22 fileserver kernel: [ 605.161362] [<ffffffff81142192>] > wait_on_page_bit+0xb2/0xc0 > Aug 19 04:53:22 fileserver kernel: [ 605.161401] [<ffffffff8109b9d0>] ? > autoremove_wake_function+0x30/0x30 > Aug 19 04:53:22 fileserver kernel: [ 605.161443] [<ffffffff81391a73>] > prepare_pages+0x163/0x1e0 > Aug 19 04:53:22 fileserver kernel: [ 605.161481] [<ffffffff813922b3>] > __btrfs_buffered_write.isra.4+0x1f3/0x6e0 > Aug 19 04:53:22 fileserver kernel: [ 605.161523] [<ffffffff810b883e>] ? > current_fs_time+0x1e/0x30 > Aug 19 04:53:22 fileserver kernel: [ 605.161562] [<ffffffff811450ca>] ? > generic_file_read_iter+0x5fa/0x6e0 > Aug 19 04:53:22 fileserver kernel: [ 605.161605] [<ffffffff81395d46>] > btrfs_file_write_iter+0x186/0x570 > Aug 19 04:53:22 fileserver kernel: [ 605.161644] [<ffffffff811ba751>] > __vfs_write+0xc1/0x120 > Aug 19 04:53:22 fileserver kernel: [ 605.161685] [<ffffffff811bb45f>] > vfs_write+0xbf/0x1a0 > Aug 19 04:53:22 fileserver kernel: [ 605.161723] [<ffffffff811bc9cf>] > SyS_pwrite64+0x7f/0xa0 > Aug 19 04:53:22 fileserver kernel: [ 605.161764] [<ffffffff8188cba9>] > entry_SYSCALL_64_fastpath+0x1c/0xa7 > Aug 19 04:53:22 fileserver kernel: [ 605.161831] INFO: task > kworker/1:28:4864 blocked for more than 120 seconds. > Aug 19 04:53:22 fileserver kernel: [ 605.161870] Not tainted > 4.8.0-rc2-next-20160818 #15 > Aug 19 04:53:22 fileserver kernel: [ 605.161909] "echo 0 > > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > Aug 19 04:53:22 fileserver kernel: [ 605.161950] kworker/1:28 D > ffff8800030ebce8 0 4864 2 0x00000000 > Aug 19 04:53:22 fileserver kernel: [ 605.162060] Workqueue: events > update_writeback_rate > Aug 19 04:53:22 fileserver kernel: [ 605.162131] ffff8800030ebce8 > ffff88010dc02378 ffff88010dc02c00 ffff8800030e20c0 > Aug 19 04:53:22 fileserver kernel: [ 605.162301] ffff8800030ebcd0 > ffff8800030ec000 ffff880220510ac0 ffff8800030ebd20 > Aug 19 04:53:22 fileserver kernel: [ 605.162474] ffff880220510ad8 > ffff880220510b00 ffff8800030ebd00 ffffffff81888bfa > Aug 19 04:53:22 fileserver kernel: [ 605.162644] Call Trace: > Aug 19 04:53:22 fileserver kernel: [ 605.162685] [<ffffffff81888bfa>] > schedule+0x3a/0x90 > Aug 19 04:53:22 fileserver kernel: [ 605.162723] [<ffffffff8188af15>] > rwsem_down_read_failed+0xe5/0x120 > Aug 19 04:53:22 fileserver kernel: [ 605.162765] [<ffffffff8108c2c0>] ? > update_curr+0x70/0x160 > Aug 19 04:53:22 fileserver kernel: [ 605.162805] [<ffffffff81489008>] > call_rwsem_down_read_failed+0x18/0x30 > Aug 19 04:53:22 fileserver kernel: [ 605.162847] [<ffffffff81076165>] ? > process_one_work+0x1d5/0x480 > Aug 19 04:53:22 fileserver kernel: [ 605.162888] [<ffffffff8188a842>] > down_read+0x12/0x30 > Aug 19 04:53:22 fileserver kernel: [ 605.162926] [<ffffffff8168364b>] > update_writeback_rate+0x2b/0x210 > Aug 19 04:53:22 fileserver kernel: [ 605.162967] [<ffffffff81076170>] > process_one_work+0x1e0/0x480 > Aug 19 04:53:22 fileserver kernel: [ 605.163005] [<ffffffff81076453>] > worker_thread+0x43/0x4e0 > Aug 19 04:53:22 fileserver kernel: [ 605.163046] [<ffffffff81076410>] ? > process_one_work+0x480/0x480 > Aug 19 04:53:22 fileserver kernel: [ 605.163084] [<ffffffff8107bc94>] > kthread+0xc4/0xe0 > Aug 19 04:53:22 fileserver kernel: [ 605.163126] [<ffffffff8188cddf>] > ret_from_fork+0x1f/0x40 > Aug 19 04:53:22 fileserver kernel: [ 605.163164] [<ffffffff8107bbd0>] ? > kthread_worker_fn+0x110/0x110 > Aug 19 04:53:22 fileserver kernel: [ 605.163248] INFO: task sync:5521 > blocked for more than 120 seconds. > Aug 19 04:53:22 fileserver kernel: [ 605.163327] Not tainted > 4.8.0-rc2-next-20160818 #15 > Aug 19 04:53:22 fileserver kernel: [ 605.163365] "echo 0 > > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > Aug 19 04:53:22 fileserver kernel: [ 605.163408] sync D > ffff88011671bbb8 0 5521 4816 0x00000000 > Aug 19 04:53:22 fileserver kernel: [ 605.163512] ffff88011671bbb8 > ffff88011671bc18 ffffffff8141ae00 ffff88011671c2c0 > Aug 19 04:53:22 fileserver kernel: [ 605.163684] ffffea0007948640 > ffff88011671c000 ffff88022fd17900 7fffffffffffffff > Aug 19 04:53:22 fileserver kernel: [ 605.163854] ffffffff818894d0 > ffff88011671bd18 ffff88011671bbd0 ffffffff81888bfa > Aug 19 04:53:22 fileserver kernel: [ 605.166269] Call Trace: > Aug 19 04:53:22 fileserver kernel: [ 605.166317] [<ffffffff8141ae00>] ? > avc_has_perm_noaudit+0x70/0xe0 > Aug 19 04:53:22 fileserver kernel: [ 605.166367] [<ffffffff818894d0>] ? > bit_wait+0x60/0x60 > Aug 19 04:53:22 fileserver kernel: [ 605.166410] [<ffffffff81888bfa>] > schedule+0x3a/0x90 > Aug 19 04:53:22 fileserver kernel: [ 605.166448] [<ffffffff8188b83e>] > schedule_timeout+0x2de/0x420 > Aug 19 04:53:22 fileserver kernel: [ 605.166491] [<ffffffff8108d26b>] ? > check_preempt_wakeup+0x11b/0x280 > Aug 19 04:53:22 fileserver kernel: [ 605.166530] [<ffffffff810c1c9d>] ? > ktime_get+0x4d/0xc0 > Aug 19 04:53:22 fileserver kernel: [ 605.166571] [<ffffffff818894d0>] ? > bit_wait+0x60/0x60 > Aug 19 04:53:22 fileserver kernel: [ 605.166608] [<ffffffff818883ef>] > io_schedule_timeout+0x9f/0x110 > Aug 19 04:53:22 fileserver kernel: [ 605.166650] [<ffffffff818894e6>] > bit_wait_io+0x16/0x60 > Aug 19 04:53:22 fileserver kernel: [ 605.166688] [<ffffffff818891d3>] > __wait_on_bit+0x53/0x80 > Aug 19 04:53:22 fileserver kernel: [ 605.166729] [<ffffffff8114300e>] ? > find_get_pages_tag+0x23e/0x280 > Aug 19 04:53:22 fileserver kernel: [ 605.166768] [<ffffffff81142192>] > wait_on_page_bit+0xb2/0xc0 > Aug 19 04:53:22 fileserver kernel: [ 605.166810] [<ffffffff8109b9d0>] ? > autoremove_wake_function+0x30/0x30 > Aug 19 04:53:22 fileserver kernel: [ 605.166849] [<ffffffff81142289>] > __filemap_fdatawait_range+0xe9/0x140 > Aug 19 04:53:22 fileserver kernel: [ 605.166891] [<ffffffff81144a0b>] > filemap_fdatawait_keep_errors+0x1b/0x20 > Aug 19 04:53:22 fileserver kernel: [ 605.166930] [<ffffffff811e8daf>] > sync_inodes_sb+0x21f/0x270 > Aug 19 04:53:22 fileserver kernel: [ 605.166972] [<ffffffff811ed300>] ? > SyS_tee+0x3f0/0x3f0 > Aug 19 04:53:22 fileserver kernel: [ 605.167010] [<ffffffff811ed310>] > sync_inodes_one_sb+0x10/0x20 > Aug 19 04:53:22 fileserver kernel: [ 605.167052] [<ffffffff811bf058>] > iterate_supers+0xb8/0x110 > Aug 19 04:53:22 fileserver kernel: [ 605.167090] [<ffffffff811ed620>] > sys_sync+0x30/0x90 > Aug 19 04:53:22 fileserver kernel: [ 605.167132] [<ffffffff8188cba9>] > entry_SYSCALL_64_fastpath+0x1c/0xa7 > Aug 19 04:55:23 fileserver kernel: [ 725.984081] INFO: task kworker/u4:1:22 > blocked for more than 120 seconds. > Aug 19 04:55:23 fileserver kernel: [ 725.984102] Not tainted > 4.8.0-rc2-next-20160818 #15 > Aug 19 04:55:23 fileserver kernel: [ 725.984118] "echo 0 > > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > Aug 19 04:55:23 fileserver kernel: [ 725.984131] kworker/u4:1 D > ffff88022666bad8 0 22 2 0x00000000 > Aug 19 04:55:23 fileserver kernel: [ 725.984160] Workqueue: btrfs-submit > btrfs_submit_helper > Aug 19 04:55:23 fileserver kernel: [ 725.984175] ffff88022666bad8 > ffffffff81a65800 ffff880179694040 ffff880226666100 > Aug 19 04:55:23 fileserver kernel: [ 725.984204] ffff88022666bae0 > ffff88022666c000 ffff880220510ac0 ffff88022666bb10 > Aug 19 04:55:23 fileserver kernel: [ 725.984235] ffff880220510ad8 > ffff880220510000 ffff88022666baf0 ffffffff81888bfa > Aug 19 04:55:23 fileserver kernel: [ 725.984263] Call Trace: > Aug 19 04:55:23 fileserver kernel: [ 725.984279] [<ffffffff81888bfa>] > schedule+0x3a/0x90 > Aug 19 04:55:23 fileserver kernel: [ 725.984289] [<ffffffff8188af15>] > rwsem_down_read_failed+0xe5/0x120 > Aug 19 04:55:23 fileserver kernel: [ 725.984304] [<ffffffff81489008>] > call_rwsem_down_read_failed+0x18/0x30 > Aug 19 04:55:23 fileserver kernel: [ 725.984315] [<ffffffff8188a842>] > down_read+0x12/0x30 > Aug 19 04:55:23 fileserver kernel: [ 725.984329] [<ffffffff8167757e>] > cached_dev_make_request+0x65e/0xd90 > Aug 19 04:55:23 fileserver kernel: [ 725.985211] [<ffffffff81457f8d>] > generic_make_request+0xdd/0x190 > Aug 19 04:55:23 fileserver kernel: [ 725.985224] [<ffffffff814580b5>] > submit_bio+0x75/0x140 > Aug 19 04:55:23 fileserver kernel: [ 725.985235] [<ffffffff8114610d>] ? > mempool_free+0x2d/0x90 > Aug 19 04:55:23 fileserver kernel: [ 725.985249] [<ffffffff810832a1>] ? > preempt_count_sub+0x51/0x80 > Aug 19 04:55:23 fileserver kernel: [ 725.985259] [<ffffffff813a5d58>] > run_scheduled_bios+0x258/0x580 > Aug 19 04:55:23 fileserver kernel: [ 725.985273] [<ffffffff8139f482>] ? > end_bio_extent_readpage+0x202/0x5b0 > Aug 19 04:55:23 fileserver kernel: [ 725.985284] [<ffffffff813a6090>] > pending_bios_fn+0x10/0x20 > Aug 19 04:55:23 fileserver kernel: [ 725.985297] [<ffffffff813b0f87>] > btrfs_scrubparity_helper+0x77/0x340 > Aug 19 04:55:23 fileserver kernel: [ 725.985307] [<ffffffff813b1359>] > btrfs_submit_helper+0x9/0x10 > Aug 19 04:55:23 fileserver kernel: [ 725.985321] [<ffffffff81076170>] > process_one_work+0x1e0/0x480 > Aug 19 04:55:23 fileserver kernel: [ 725.985331] [<ffffffff81076453>] > worker_thread+0x43/0x4e0 > Aug 19 04:55:23 fileserver kernel: [ 725.985343] [<ffffffff81076410>] ? > process_one_work+0x480/0x480 > Aug 19 04:55:23 fileserver kernel: [ 725.985354] [<ffffffff8107bc94>] > kthread+0xc4/0xe0 > Aug 19 04:55:23 fileserver kernel: [ 725.985368] [<ffffffff8188cddf>] > ret_from_fork+0x1f/0x40 > Aug 19 04:55:23 fileserver kernel: [ 725.985378] [<ffffffff8107bbd0>] ? > kthread_worker_fn+0x110/0x110 > Aug 19 04:55:23 fileserver kernel: [ 725.985406] INFO: task > bcache_writebac:972 blocked for more than 120 seconds. > Aug 19 04:55:23 fileserver kernel: [ 725.985416] Not tainted > 4.8.0-rc2-next-20160818 #15 > Aug 19 04:55:23 fileserver kernel: [ 725.985428] "echo 0 > > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > Aug 19 04:55:23 fileserver kernel: [ 725.985441] bcache_writebac D > ffff880220bc3cd8 0 972 2 0x00000000 > Aug 19 04:55:23 fileserver kernel: [ 725.985464] ffff880220bc3cd8 > ffff880220bc3cb0 ffffffff81083200 ffff8802248642c0 > Aug 19 04:55:23 fileserver kernel: [ 725.985492] ffff880220510000 > ffff880220bc4000 ffff880220510ac0 ffff880220510ac0 > Aug 19 04:55:23 fileserver kernel: [ 725.985524] ffff880220510ad8 > ffffffff00000001 ffff880220bc3cf0 ffffffff81888bfa > Aug 19 04:55:23 fileserver kernel: [ 725.985551] Call Trace: > Aug 19 04:55:23 fileserver kernel: [ 725.985564] [<ffffffff81083200>] ? > finish_task_switch+0x180/0x1d0 > Aug 19 04:55:23 fileserver kernel: [ 725.985574] [<ffffffff81888bfa>] > schedule+0x3a/0x90 > Aug 19 04:55:23 fileserver kernel: [ 725.985587] [<ffffffff8188b059>] > rwsem_down_write_failed+0x109/0x280 > Aug 19 04:55:23 fileserver kernel: [ 725.985598] [<ffffffff81489037>] > call_rwsem_down_write_failed+0x17/0x30 > Aug 19 04:55:23 fileserver kernel: [ 725.985611] [<ffffffff81888c04>] ? > schedule+0x44/0x90 > Aug 19 04:55:23 fileserver kernel: [ 725.985621] [<ffffffff8188a87f>] > down_write+0x1f/0x30 > Aug 19 04:55:23 fileserver kernel: [ 725.985634] [<ffffffff81683ccc>] > bch_writeback_thread+0x5c/0x8a0 > Aug 19 04:55:23 fileserver kernel: [ 725.985645] [<ffffffff81683c70>] ? > write_dirty+0xb0/0xb0 > Aug 19 04:55:23 fileserver kernel: [ 725.985658] [<ffffffff8107bc94>] > kthread+0xc4/0xe0 > Aug 19 04:55:23 fileserver kernel: [ 725.985668] [<ffffffff8188cddf>] > ret_from_fork+0x1f/0x40 > Aug 19 04:55:23 fileserver kernel: [ 725.985681] [<ffffffff8107bbd0>] ? > kthread_worker_fn+0x110/0x110 > Aug 19 04:55:23 fileserver kernel: [ 725.985741] INFO: task java:4669 > blocked for more than 120 seconds. > Aug 19 04:55:23 fileserver kernel: [ 725.985751] Not tainted > 4.8.0-rc2-next-20160818 #15 > Aug 19 04:55:23 fileserver kernel: [ 725.985762] "echo 0 > > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > Aug 19 04:55:23 fileserver kernel: [ 725.985774] java D > ffff88014d91fb08 0 4669 1 0x00000000 > Aug 19 04:55:23 fileserver kernel: [ 725.985798] ffff88014d91fb08 > ffff88014d920000 ffff88014d91fa00 ffff88014d8da140 > Aug 19 04:55:23 fileserver kernel: [ 725.985826] ffff88022585a0b8 > ffff88014d920000 ffff88022fc17900 7fffffffffffffff > Aug 19 04:55:23 fileserver kernel: [ 725.985857] ffffffff818894d0 > ffff88014d91fc60 ffff88014d91fb20 ffffffff81888bfa > Aug 19 04:55:23 fileserver kernel: [ 725.985885] Call Trace: > Aug 19 04:55:23 fileserver kernel: [ 725.985897] [<ffffffff818894d0>] ? > bit_wait+0x60/0x60 > Aug 19 04:55:23 fileserver kernel: [ 725.985907] [<ffffffff81888bfa>] > schedule+0x3a/0x90 > Aug 19 04:55:23 fileserver kernel: [ 725.985919] [<ffffffff8188b83e>] > schedule_timeout+0x2de/0x420 > Aug 19 04:55:23 fileserver kernel: [ 725.985929] [<ffffffff8188c511>] ? > _raw_spin_unlock+0x11/0x30 > Aug 19 04:55:23 fileserver kernel: [ 725.985943] [<ffffffff8188c511>] ? > _raw_spin_unlock+0x11/0x30 > Aug 19 04:55:23 fileserver kernel: [ 725.985953] [<ffffffff8135e695>] ? > can_overcommit.part.35+0xc5/0x110 > Aug 19 04:55:23 fileserver kernel: [ 725.985967] [<ffffffff810c1c9d>] ? > ktime_get+0x4d/0xc0 > Aug 19 04:55:23 fileserver kernel: [ 725.985977] [<ffffffff818894d0>] ? > bit_wait+0x60/0x60 > Aug 19 04:55:23 fileserver kernel: [ 725.985989] [<ffffffff818883ef>] > io_schedule_timeout+0x9f/0x110 > Aug 19 04:55:23 fileserver kernel: [ 725.985999] [<ffffffff818894e6>] > bit_wait_io+0x16/0x60 > Aug 19 04:55:23 fileserver kernel: [ 725.986012] [<ffffffff818891d3>] > __wait_on_bit+0x53/0x80 > Aug 19 04:55:23 fileserver kernel: [ 725.986021] [<ffffffff81142192>] > wait_on_page_bit+0xb2/0xc0 > Aug 19 04:55:23 fileserver kernel: [ 725.986035] [<ffffffff8109b9d0>] ? > autoremove_wake_function+0x30/0x30 > Aug 19 04:55:23 fileserver kernel: [ 725.986045] [<ffffffff81391a73>] > prepare_pages+0x163/0x1e0 > Aug 19 04:55:23 fileserver kernel: [ 725.986058] [<ffffffff813922b3>] > __btrfs_buffered_write.isra.4+0x1f3/0x6e0 > Aug 19 04:55:23 fileserver kernel: [ 725.986069] [<ffffffff81395d46>] > btrfs_file_write_iter+0x186/0x570 > Aug 19 04:55:23 fileserver kernel: [ 725.986082] [<ffffffff811ba751>] > __vfs_write+0xc1/0x120 > Aug 19 04:55:23 fileserver kernel: [ 725.986092] [<ffffffff811bb45f>] > vfs_write+0xbf/0x1a0 > Aug 19 04:55:23 fileserver kernel: [ 725.986105] [<ffffffff811bc84a>] > SyS_write+0x4a/0xb0 > Aug 19 04:55:23 fileserver kernel: [ 725.986115] [<ffffffff8188cba9>] > entry_SYSCALL_64_fastpath+0x1c/0xa7 > Aug 19 04:55:23 fileserver kernel: [ 725.986130] INFO: task java:4691 > blocked for more than 120 seconds. > Aug 19 04:55:23 fileserver kernel: [ 725.986139] Not tainted > 4.8.0-rc2-next-20160818 #15 > Aug 19 04:55:23 fileserver kernel: [ 725.986151] "echo 0 > > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > Aug 19 04:55:23 fileserver kernel: [ 725.986163] java D > ffff880147f0bb08 0 4691 1 0x00000000 > Aug 19 04:55:23 fileserver kernel: [ 725.986186] ffff880147f0bb08 > ffff880155d2e578 ffff88014d996040 ffff880147f021c0 > Aug 19 04:55:23 fileserver kernel: [ 725.986214] ffffffff8188c511 > ffff880147f0c000 ffff88022fd17900 7fffffffffffffff > Aug 19 04:55:23 fileserver kernel: [ 725.986245] ffffffff818894d0 > ffff880147f0bc60 ffff880147f0bb20 ffffffff81888bfa > Aug 19 04:55:23 fileserver kernel: [ 725.986272] Call Trace: > Aug 19 04:55:23 fileserver kernel: [ 725.986285] [<ffffffff8188c511>] ? > _raw_spin_unlock+0x11/0x30 > Aug 19 04:55:23 fileserver kernel: [ 725.986295] [<ffffffff818894d0>] ? > bit_wait+0x60/0x60 > Aug 19 04:55:23 fileserver kernel: [ 725.986308] [<ffffffff81888bfa>] > schedule+0x3a/0x90 > Aug 19 04:55:23 fileserver kernel: [ 725.986317] [<ffffffff8188b83e>] > schedule_timeout+0x2de/0x420 > Aug 19 04:55:23 fileserver kernel: [ 725.986330] [<ffffffff8188c511>] ? > _raw_spin_unlock+0x11/0x30 > Aug 19 04:55:23 fileserver kernel: [ 725.986340] [<ffffffff8188c511>] ? > _raw_spin_unlock+0x11/0x30 > Aug 19 04:55:23 fileserver kernel: [ 725.986353] [<ffffffff8135e695>] ? > can_overcommit.part.35+0xc5/0x110 > Aug 19 04:55:23 fileserver kernel: [ 725.986363] [<ffffffff810c1c9d>] ? > ktime_get+0x4d/0xc0 > Aug 19 04:55:23 fileserver kernel: [ 725.986376] [<ffffffff818894d0>] ? > bit_wait+0x60/0x60 > Aug 19 04:55:23 fileserver kernel: [ 725.986386] [<ffffffff818883ef>] > io_schedule_timeout+0x9f/0x110 > Aug 19 04:55:23 fileserver kernel: [ 725.986399] [<ffffffff818894e6>] > bit_wait_io+0x16/0x60 > Aug 19 04:55:23 fileserver kernel: [ 725.986408] [<ffffffff818891d3>] > __wait_on_bit+0x53/0x80 > Aug 19 04:55:23 fileserver kernel: [ 725.986421] [<ffffffff81142192>] > wait_on_page_bit+0xb2/0xc0 > Aug 19 04:55:23 fileserver kernel: [ 725.986431] [<ffffffff8109b9d0>] ? > autoremove_wake_function+0x30/0x30 > Aug 19 04:55:23 fileserver kernel: [ 725.986444] [<ffffffff81391a73>] > prepare_pages+0x163/0x1e0 > Aug 19 04:55:23 fileserver kernel: [ 725.986453] [<ffffffff813922b3>] > __btrfs_buffered_write.isra.4+0x1f3/0x6e0 > Aug 19 04:55:23 fileserver kernel: [ 725.986468] [<ffffffff810b883e>] ? > current_fs_time+0x1e/0x30 > Aug 19 04:55:23 fileserver kernel: [ 725.986478] [<ffffffff811450ca>] ? > generic_file_read_iter+0x5fa/0x6e0 > Aug 19 04:55:23 fileserver kernel: [ 725.986491] [<ffffffff81395d46>] > btrfs_file_write_iter+0x186/0x570 > Aug 19 04:55:23 fileserver kernel: [ 725.986501] [<ffffffff811ba751>] > __vfs_write+0xc1/0x120 > Aug 19 04:55:23 fileserver kernel: [ 725.986514] [<ffffffff811bb45f>] > vfs_write+0xbf/0x1a0 > Aug 19 04:55:23 fileserver kernel: [ 725.986523] [<ffffffff811bc9cf>] > SyS_pwrite64+0x7f/0xa0 > Aug 19 04:55:23 fileserver kernel: [ 725.986537] [<ffffffff8188cba9>] > entry_SYSCALL_64_fastpath+0x1c/0xa7 -- 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
