Sometimes, stopping a raid6 array (with journal) hangs, the mdX_raid6
process pegs at 100% CPU, and there is no I/O. Looks like it's stuck in
an infinite loop.
Kernel: 4.13.13-200.fc26.x86_64
The stack trace (echo l > /proc/sysrq-trigger) is always the same:
handle_stripe+0x10c/0x2140 [raid456]
? pick_next_task_fair+0x491/0x550
handle_active_stripes.isra.60+0x3e5/0x5a0 [raid456]
raid5d+0x42e/0x630 [raid456]
? prepare_to_wait_event+0x79/0x160
md_thread+0x125/0x170
? md_thread+0x125/0x170
? finish_wait+0x80/0x80
kthread+0x125/0x140
? state_show+0x2f0/0x2f0
? kthread_park+0x60/0x60
? do_syscall_64+0x67/0x140
ret_from_fork+0x25/0x30
The array is healthy, has a journal, and writes were idle for several
minutes prior to running 'mdadm --stop'.
md124 : active raid6 sdt1[6] sds1[5] sdw1[1] sdx1[2] sdy1[3] sdu1[7]
sdv1[8] sdz1[4] md125p4[9](J)
23442092928 blocks super 1.2 level 6, 64k chunk, algorithm 2
[8/8] [UUUUUUUU]
stripe_cache_active: 2
stripe_cache_size: 32768
array_state: write-pending
journal_mode: write-through [write-back]
consistency_policy: journal
--Larkin
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