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

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Date:   Wed, 4 Jan 2017 14:30:15 -0800
From:   Shaohua Li <shli@...nel.org>
To:     MasterPrenium <masterprenium.lkml@...il.com>
Cc:     linux-kernel@...r.kernel.org, xen-users@...ts.xen.org,
        linux-raid@...r.kernel.org,
        "MasterPrenium@...il.com" <MasterPrenium@...il.com>,
        xen-devel@...ts.xenproject.org
Subject: Re: PROBLEM: Kernel BUG with raid5 soft + Xen + DRBD - invalid opcode

On Fri, Dec 23, 2016 at 07:25:56PM +0100, MasterPrenium wrote:
> 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.

what did you mean 'huge' I/O (20M/s)? Is it possible you can reproduce the
issue with a raw raid5 raid? It would be even better if you can give me a fio
job file with the issue, so I can easily debug it.

also please check if upstream patch (e8d7c33 md/raid5: limit request size
according to implementation limits) helps.

Thanks,
Shaohua