[Bugme-new] [Bug 27142] New: Kernel panic on highly loaded webserver in task_rq_lock

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=27142

           Summary: Kernel panic on highly loaded webserver in
                    task_rq_lock
           Product: Process Management
           Version: 2.5
    Kernel Version: 2.6.36.3
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: Scheduler
        AssignedTo: mingo at elte.hu
        ReportedBy: yuriy at ucoz.com
        Regression: Yes


Created an attachment (id=44442)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=44442)
Screenshot

We have about 50 webservers. Most of them have kernel 2.6.32.23 (custom). As
support for new hardware will be necessary on new servers we have to use more
recent kernel on them. Trying 2.6.36.1 gave kernel panic after about a day of
load (the same picture as in attachment for 2.6.36.3). I waited for patches and
tryed 2.6.36.3 (as I didn't find anything related to this bug in 2.6.36.2
changelist) - result is the same. After couple of days we got kernel panic. I
have nothing more except for screenshot made from KVM and kernel config.
It seam that problem is inside scheduler or VFS, both were updated for 2.6.36.
Picture and config in attachments.

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