Re: Kernel panic under 3.2.14 Xen dom0 and SCST trunk

On 07/24/12 19:50, Joseph Glanville wrote:

On 25 July 2012 03:53, Bart Van Assche [off-list ref] wrote:

quoted

On 07/24/12 15:16, Joseph Glanville wrote:

quoted

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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