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    SubjectRe: Kernel oops with 2.6.26, padlock and ipsec: probably problem with fpu state changes
    Date
    On Wednesday 06 August 2008, Suresh Siddha wrote:
    > On Wed, Aug 06, 2008 at 01:14:02PM -0700, Siddha, Suresh B wrote:
    > > On Wed, Aug 06, 2008 at 10:33:25AM -0700, Wolfgang Walter wrote:
    > > > Hello Herbert,
    > > >
    > > > I think I finally found the problem.
    > > >
    > > > Here a short description again: all our routers with a via C3 using
    padlock for AES-encryption are
    > > > crashing with 2.6.26 while they work fine with 2.6.25. Not using padlock
    > > > (i.e. using the i386 assembler version of AES) they just work fine.
    > >
    > > Both the padlock version or asm version don't use FP/math registers,
    right?
    > > It is interesting that you don't see the problem with asm version
    > > but see the problem with padlock version.
    > >
    > > Does disabling CONFIG_PREEMPT in 2.6.26 change anything? And also,
    > > can you provide the complete kernel log till the point of failure(oops
    > > that you sent doesn't have the call trace info)
    >
    > BTW, in one of your oops, I see:
    >
    > note: cron[1207] exited with preempt_count 268435459
    >
    > I smell some kind of stack corruption here which is corrupting
    > thread_info (in the above case preempt_count in the thread_info).
    >

    I don't think 268435459 is a strong indication of stack corruption:

    268435459 == 0x10000003 == PREEMPT_ACTIVE|0x03

    Regards,
    --
    Wolfgang Walter
    Studentenwerk München
    Anstalt des öffentlichen Rechts
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