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SubjectRe: Race in RPC code
On Fri, Feb 07, 2003 at 02:21:50PM +0100, Trond Myklebust wrote:
> >>>>> " " == Jakob Oestergaard <jakob@unthought.net> writes:
>
>
> > We don't know whether req has been modified between the
> > assignment and the spin_lock.
>
> It had better not be. If it is, then I want to know where so that we
> can fix it.
>
> req->rq_xprt is set up when the request is initialized. It
> is not meant to change until the request gets released. This again
> should not happen while the request is still on the wait queue.
>
> IOW the fix you propose would just be papering over another problem.

Any suggestions as to how it could happen?

The box is running huge compile jobs (>100MB memory used by each
compiler - runs 2-3 compilers concurrently) all day long - we never had
a GCC sig11 error. It has 512 MB of ECC memory (and ECC is enabled) - I
seriously doubt that we have a memory corruption problem.

The panic has happened once, just today.

I will be happy to try other solutions, but I can't verify whether they
work - I mean, if the box runs another few months without crashing that
doesn't really prove anything...

Thanks for commenting!

--
................................................................
: jakob@unthought.net : And I see the elder races, :
:.........................: putrid forms of man :
: Jakob Østergaard : See him rise and claim the earth, :
: OZ9ABN : his downfall is at hand. :
:.........................:............{Konkhra}...............:
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