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    SubjectRe: 2.6.18-rt1
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    On Sat, 2006-09-30 at 23:48 +0530, Dipankar Sarma wrote:
    > On Sat, Sep 30, 2006 at 02:06:04PM -0400, Lee Revell wrote:
    > > I got this Oops with -rt3, looks RCU related. Apologies in advance if
    > > it's already known.
    > >
    > > Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP:
    > > [<ffffffff802aafa7>] __rcu_read_unlock+0x2e/0x82
    > > PGD 46a3067 PUD 4e27067 PMD 0
    > > Oops: 0002 [1] PREEMPT SMP
    > > CPU 1
    >
    > I see a very similar crash while running rcutorture on 2.6.18-mm1 and
    > my rcu patchset that has rcupreempt stuff rom -rt. I don't see this
    > while running on 2.6.18-rc3, but then rc3 had an older version
    > of rcutorture. I am working on narrowing it down.
    >
    > The following script reproduces the problem quickly (within
    > a couple of minutes) in my 4-cpu x86_64 system -

    Let me know if you want more info such as config. I was compiling a
    kernel when the Oops occurred. System is Athlon X2.

    Lee

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