I got the following on 4.17.6 while running btrfs check --repair on an
unmounted filesystem (not the lowmem version)
I understand that btrfs check is userland only, although it seems that
it caused these FS hangs on a different filesystem (the trace of course
does not provide info on which FS)
Any idea what happened here?
I'm going to wait a few hours without running btrfs check to see if it
happens again and then if running btrfs check will re-create this issue,
but other suggestions (if any), are welcome:
[ 2538.566952] Workqueue: btrfs-endio-write btrfs_endio_write_helper
[ 2538.616484] Call Trace:
[ 2538.623828] ? __schedule+0x53e/0x59b
[ 2538.634802] schedule+0x7f/0x98
[ 2538.644214] wait_current_trans+0x9b/0xd8
[ 2538.656229] ? add_wait_queue+0x3a/0x3a
[ 2538.668239] start_transaction+0x1ce/0x325
[ 2538.680556] btrfs_finish_ordered_io+0x240/0x5d3
[ 2538.694414] normal_work_helper+0x118/0x277
[ 2538.706984] process_one_work+0x19c/0x281
[ 2538.719036] ? rescuer_thread+0x279/0x279
[ 2538.731064] worker_thread+0x197/0x246
[ 2538.742322] kthread+0xeb/0xf0
[ 2538.751492] ? kthread_create_worker_on_cpu+0x66/0x66
[ 2538.766666] ret_from_fork+0x35/0x40
[ 2538.777403] INFO: task kworker/u16:11:369 blocked for more than 120 seconds.
[ 2538.799025] Not tainted 4.17.6-amd64-preempt-sysrq-20180818 #4
[ 2538.818109] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
[ 2538.841640] kworker/u16:11 D 0 369 2 0x80000000
[ 2538.858112] Workqueue: btrfs-endio-write btrfs_endio_write_helper
[ 2538.876401] Call Trace:
[ 2538.883770] ? __schedule+0x53e/0x59b
[ 2538.894760] schedule+0x7f/0x98
[ 2538.904192] wait_current_trans+0x9b/0xd8
[ 2538.916242] ? add_wait_queue+0x3a/0x3a
[ 2538.927772] start_transaction+0x1ce/0x325
[ 2538.940081] btrfs_finish_ordered_io+0x240/0x5d3
[ 2538.953973] normal_work_helper+0x118/0x277
[ 2538.966523] process_one_work+0x19c/0x281
[ 2538.978546] ? rescuer_thread+0x279/0x279
[ 2538.990560] worker_thread+0x197/0x246
[ 2539.001797] kthread+0xeb/0xf0
[ 2539.010986] ? kthread_create_worker_on_cpu+0x66/0x66
[ 2539.026137] ret_from_fork+0x35/0x40
[ 2539.037666] INFO: task btrfs-transacti:921 blocked for more than 120 seconds.
[ 2539.059851] Not tainted 4.17.6-amd64-preempt-sysrq-20180818 #4
[ 2539.079733] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
[ 2539.104007] btrfs-transacti D 0 921 2 0x80000000
[ 2539.121257] Call Trace:
[ 2539.129377] ? __schedule+0x53e/0x59b
[ 2539.141171] schedule+0x7f/0x98
[ 2539.151370] btrfs_tree_lock+0xa6/0x19d
[ 2539.163621] ? add_wait_queue+0x3a/0x3a
[ 2539.175876] btrfs_search_slot+0x5aa/0x756
[ 2539.188899] lookup_inline_extent_backref+0x11a/0x485
[ 2539.204781] ? fixup_slab_list.isra.43+0x1b/0x72
[ 2539.219360] __btrfs_free_extent+0xf1/0xa72
[ 2539.232597] ? btrfs_merge_delayed_refs+0x18b/0x1a7
[ 2539.247922] ? __mutex_trylock_or_owner+0x43/0x54
[ 2539.262708] __btrfs_run_delayed_refs+0xad8/0xc40
[ 2539.277504] btrfs_run_delayed_refs+0x6e/0x16a
[ 2539.291519] btrfs_commit_transaction+0x42/0x710
[ 2539.306043] ? start_transaction+0x295/0x325
[ 2539.319516] transaction_kthread+0xc9/0x135
[ 2539.332757] ? btrfs_cleanup_transaction+0x3ee/0x3ee
[ 2539.348327] kthread+0xeb/0xf0
[ 2539.358155] ? kthread_create_worker_on_cpu+0x66/0x66
[ 2539.373977] ret_from_fork+0x35/0x40
[ 2539.385394] INFO: task vnstatd:6338 blocked for more than 120 seconds.
[ 2539.405667] Not tainted 4.17.6-amd64-preempt-sysrq-20180818 #4
Thanks,
Marc
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/ | PGP 7F55D5F27AAF9D08
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