Re: Kernel panic under 3.2.14 Xen dom0 and SCST trunk

[Bart Van Assche <bvanassche-HInyCGIudOg@public.gmane.org>]

On 07/24/12 19:50, Joseph Glanville wrote:
> On 25 July 2012 03:53, Bart Van Assche <bvanassche-HInyCGIudOg@public.gmane.org> wrote:
>> On 07/24/12 15:16, Joseph Glanville wrote:
>>> I have been seeing this KP occur about every 3 days on our staging cluster.
>>> I am not exactly sure what the root cause would be.. I assume this
>>> would be a bug in SCST.
>>> The kernel is a 3.2.14 with Ubuntu patch series applied and Bart's SRP
>>> HA patches.
>>
>> It would help if you could tell us a bit more about your setup. It looks
>> like SCST is running in dom0, and an IB workload in domU ? If so, which
>> workload was running in domU ?
> 
> There is no IB workload in the domU's.
> In this particular case there are 2 dom0s connected together both
> acting as SRP targets and initators.
> Their are sometimes vms running on these dom0s but they aren't
> currently in production so they aren't doing very much at the moment.
> 
> The workload is typically one of adding and removing luns to
> ini_groups, rescan the host to ensure they are removed cleanly etc.
> As far as I can tell this would have to manifest as a race condition
> as it can go for about 2 or so weeks without occuring.
> Also worth noting is that I have a similar setup running on 2.6.32
> with no issues also a pvops dom0 using SCST and ib_srp.
> 
> Could it be your patch series introduced the bug? Those are the only
> patches we have in our tree that effect SRP.

You might be hitting a device removal bug in the SCSI core. It would be
appreciated if you could retest with the srp-ha branch of this kernel
tree: http://github.com/bvanassche/linux. That tree contains Linux
kernel 3.5 + SCSI 3.6-rc1 + latest (yet to be posted) srp-ha patch series.

Bart.
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