[dm-devel] [PATCH] dm mirror: fix crash caused by NULL-pointer dereference

[Eric Ren]

Hi Zdenek,


On 06/26/2017 05:46 PM, Zdenek Kabelac wrote:
> Dne 26.6.2017 v 11:08 Eric Ren napsal(a):
>>
> [... snip...]
>
> Hi
>
> Which kernel version is this ?
>
> I'd thought we've already fixed this BZ for old mirrors:
> https://bugzilla.redhat.com/show_bug.cgi?id=1382382
>
> There similar BZ for md-raid based mirrors (--type raid1)
> https://bugzilla.redhat.com/show_bug.cgi?id=1416099
My base kernel version is 4.4.68, but with this 2 latest fixes applied:

"""
Revert "dm mirror: use all available legs on multiple failures"
dm io: fix duplicate bio completion due to missing ref count
"""

Yes, I've been working on dm-mirror crash issue for couple days,
but only see this fixes above when I rebased to send my fixes out, hah.

But, with this 2 fixes, the producer can still crash the kernel. Anyway, 
I can
test with upstream kernel again ;-P

Regards,
Eric

>
>
> Regards
>
> Zdenej
>