linux-kernel - Re: PROBLEM: Kernel BUG with raid5 soft + Xen + DRBD

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Message-ID: <wrfj8tqxf89j.fsf@redhat.com>
Date:   Fri, 30 Dec 2016 15:54:00 -0500
From:   Jes Sorensen <Jes.Sorensen@...hat.com>
To:     MasterPrenium <masterprenium.lkml@...il.com>
Cc:     linux-kernel@...r.kernel.org, xen-users@...ts.xen.org,
        linux-raid@...r.kernel.org, shli@...nel.org,
        "MasterPrenium\@gmail.com" <MasterPrenium@...il.com>,
        xen-devel@...ts.xenproject.org
Subject: Re: PROBLEM: Kernel BUG with raid5 soft + Xen + DRBD - invalid opcode

MasterPrenium <masterprenium.lkml@...il.com> writes:
> Hello Guys,
>
> I've having some trouble on a new system I'm setting up. I'm getting a
> kernel BUG message, seems to be related with the use of Xen (when I
> boot the system _without_ Xen, I don't get any crash).
> Here is configuration :
> - 3x Hard Drives running on RAID 5 Software raid created by mdadm
> - On top of it, DRBD for replication over another node (Active/passive cluster)
> - On top of it, a BTRFS FileSystem with a few subvolumes
> - On top of it, XEN VMs running.
>
> The BUG is happening when I'm making "huge" I/O (20MB/s with a rsync
> for example) on the RAID5 stack.
> I've to reset system to make it work again.
>
> Reproducible : ALWAYS (making the i/o, it crash in 2-5mins). Also
> reproducible on another system with the same hardware.
>
> Kernel versions impacted (at least): kernel-4.4.26, kernel-4.8.15, kernel-4.9.0

Well you have one foreign object in there that is not part of the
kernel and which shows up in the OOPS: DRDB

What happens when you remove that from the equation?

Jes