Neil Brown [off-list ref] on Mon, 2015/08/24 07:35:

Christian Hesse [off-list ref] writes:

quoted

Hello everybody,

with linux 4.1.x I am hit by this issue with RAID5:

BUG: unable to handle kernel NULL pointer dereference at           (null)
IP: [<ffffffffa05a4b91>] get_free_stripe+0x31/0xf0 [raid456]

Thank for the report.
Please add upstrem commit:

Commit: 49895bcc7e56 ("md/raid5: don't let shrink_slab shrink too far.")

fix it.

My system is up for eight hours now, doing a lot of I/O without issue.
Thanks a lot!
-- 
Best regards,
Chris