Hi,
See below for oops messages from a 4.1.12 kernel.
The system would probably have been running a balance or scrub at the time.
Processes trying to use subvolumes blocked and it eventually needed
rebooting via sysrq to fix.
Kernel is a vanilla one from kernel.org.
thanks,
David.
INFO: task cron:12252 blocked for more than 120 seconds.
Not tainted 4.1.12-dg1 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
cron D ffff8803e0256840 0 12252 2356 0x00000000
ffff88021366caa0 ffff8803cb01c170 ffff8803cea84a20 0000000000000246
ffff880004e70000 ffff8800e72829f0 0000000000140000 ffff8800e72829f0
0000000000000001 ffff880028eb3438 ffffffff8157494f ffff88003bf0c2e0
Call Trace:
[<ffffffff8157494f>] ? schedule+0x2f/0x80
[<ffffffffa0126e2f>] ? wait_current_trans.isra.19+0x9f/0x100 [btrfs]
[<ffffffff810b04d0>] ? wait_woken+0x90/0x90
[<ffffffffa0128848>] ? start_transaction+0x438/0x5b0 [btrfs]
[<ffffffffa0136f09>] ? btrfs_create+0x39/0x1e0 [btrfs]
[<ffffffff811e4a88>] ? __d_instantiate+0x98/0x120
[<ffffffff811e32db>] ? d_rehash+0x4b/0x60
[<ffffffff811d79c4>] ? vfs_create+0xc4/0x130
[<ffffffff811dbe34>] ? do_last+0x1154/0x1210
[<ffffffff810afe01>] ? __init_waitqueue_head+0x1/0x20
[<ffffffff811dbf73>] ? path_openat+0x83/0x600
[<ffffffff810b0122>] ? __wake_up_bit+0x42/0x50
[<ffffffff81194393>] ? page_add_file_rmap+0x13/0x60
[<ffffffff811ddcd0>] ? do_filp_open+0x30/0xa0
[<ffffffff811ea55f>] ? __alloc_fd+0x9f/0x130
[<ffffffff811cb18a>] ? do_sys_open+0x12a/0x220
[<ffffffff81578ff2>] ? system_call_fastpath+0x16/0x75
INFO: task cron:12566 blocked for more than 120 seconds.
Not tainted 4.1.12-dg1 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
cron D ffff8803e0216840 0 12566 25790 0x00000000
ffff8803b08ac3d0 ffff8801b234d5c8 ffffffff81814540 ffff8803b08ac3d0
ffff88004ecc4000 ffff880266c26634 ffff8803b08ac3d0 00000000ffffffff
ffff880266c26638 0000000000000000 ffffffff8157494f ffff880266c26630
Call Trace:
[<ffffffff8157494f>] ? schedule+0x2f/0x80
[<ffffffff81574c7e>] ? schedule_preempt_disabled+0xe/0x20
[<ffffffff81576b15>] ? __mutex_lock_slowpath+0x95/0x110
[<ffffffff81576bab>] ? mutex_lock+0x1b/0x30
[<ffffffff811db061>] ? do_last+0x381/0x1210
[<ffffffff810afe01>] ? __init_waitqueue_head+0x1/0x20
[<ffffffff811dbf73>] ? path_openat+0x83/0x600
[<ffffffff811ddcd0>] ? do_filp_open+0x30/0xa0
[<ffffffff811ea55f>] ? __alloc_fd+0x9f/0x130
[<ffffffff811cb18a>] ? do_sys_open+0x12a/0x220
[<ffffffff81578ff2>] ? system_call_fastpath+0x16/0x75
INFO: task cron:12568 blocked for more than 120 seconds.
Not tainted 4.1.12-dg1 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
cron D ffff8803e0256840 0 12568 2356 0x00000000
ffff880004b71430 ffff8801247ba588 ffff8803cea84a20 ffff88004ecf0000
ffff88004ecf0000 ffff8803baccd2a4 ffff880004b71430 00000000ffffffff
ffff8803baccd2a8 0000000000000000 ffffffff8157494f ffff8803baccd2a0
Call Trace:
[<ffffffff8157494f>] ? schedule+0x2f/0x80
[<ffffffff81574c7e>] ? schedule_preempt_disabled+0xe/0x20
[<ffffffff81576b15>] ? __mutex_lock_slowpath+0x95/0x110
[<ffffffff81576bab>] ? mutex_lock+0x1b/0x30
[<ffffffff811db061>] ? do_last+0x381/0x1210
[<ffffffff810afe01>] ? __init_waitqueue_head+0x1/0x20
[<ffffffff811dbf73>] ? path_openat+0x83/0x600
[<ffffffff810b0122>] ? __wake_up_bit+0x42/0x50
[<ffffffff8115c7e8>] ? filemap_map_pages+0xc8/0x250
[<ffffffff811ddcd0>] ? do_filp_open+0x30/0xa0
[<ffffffff811ea55f>] ? __alloc_fd+0x9f/0x130
[<ffffffff811cb18a>] ? do_sys_open+0x12a/0x220
[<ffffffff81578ff2>] ? system_call_fastpath+0x16/0x75
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