Re: [LTP] [PATCH v2] sendmsg testcase for ded34e0fe8fe8c2d595bfa30626654e4b87621e0

[chrubis@suse.cz]

Hi!
> > > reproducer for:
> > > BUG: unable to handle kernel NULL pointer dereference at 0000000000000250
> > > 
> > > fixed in 3.9.0-0.rc5:
> > >   commit ded34e0fe8fe8c2d595bfa30626654e4b87621e0
> > >   Author: Paul Moore <pmoore@redhat.com>
> > >   Date:   Mon Mar 25 03:18:33 2013 +0000
> > >     unix: fix a race condition in unix_release()
> > > 
> > > This reproducer should be able to trigger it easily on 4+ CPU systems
> > > just within couple of seconds.
> > 
> > I didn't get panic on my v3.9-rc4 system by this test case.
> 
> I double checked if I got that -rc right, and that looks OK:
> $ git tag --contains ded34e0fe8fe8c2d595bfa30626654e4b87621e0
> v3.9-rc5
> v3.9-rc6
> v3.9-rc7
> 
> There is a switch "-s" for how many seconds it should run. Can you try to run
> it for couple of minutes, if that makes any difference?
> 
> If not, then I'm afraid it's not as reproducible as I thought it would be.

I've tried to run it on older kernel (3.0 with SUSE patches) and had no
luck either, the test runned for five minutes. I've even tried to
increase the number of pairs.

On what hardware, kernel (kernel config), etc. is this easily
reproducible?

-- 
Cyril Hrubis
chrubis@suse.cz

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