[Bugme-new] [Bug 13631] New: BUG/panic - update_curr

[bugzilla-daemon at bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=13631

           Summary: BUG/panic - update_curr
           Product: Process Management
           Version: 2.5
    Kernel Version: 2.6.30
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Scheduler
        AssignedTo: mingo at elte.hu
        ReportedBy: bplant at iinet.net.au
        Regression: No


Created an attachment (id=22113)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=22113)
First oops

I am not sure if this is a regression because I heavily tested previous
kernels. Please see attachments for oops. I am able to trigger these by putting
the machines under high load, but it tasks 1 or so hours usually to trigger.

-- Background info --
I am running 3 node ocfs2 xen (paravirt_ops) setup on quad core xeons. The
guest VMs have 2 CPU's and 1.5GB of memory. To trigger the bug, I do the
following:
 - Repeatedly untar/delete kernel sources on the ocfs2 fs
 - Benchmark a php application on 2 of the nodes which uses flock (on the ocfs2
fs) to control access to a cache. The php application is being benchmarked with
a concurrency of 7.

The above scenario puts the VMs under both high IO and CPU load. uptime will
report a system load of around 7-8.

The kernel was compiled using gcc 4.3.3 from ubuntu 9.04.

Please let me know what further info you require, tests you need performed or
patches you need tested.

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