[Bug 12020] scsi_times_out NULL pointer dereference

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http://bugzilla.kernel.org/show_bug.cgi?id=12020





------- Comment #8 from bs@q-leap.de  2008-12-03 02:19 -------
> Mike Anderson pointed out that we have a potential window where the
> timer can fire after we've unprepped the request in SCSI (so making
> req->special NULL) but before we call blk_requeue_request() which stops
> the timer.  We can rejig the locking to prevent this from happening, so
> could you (separately) try this patch?
> 
> James
> 

Hello James,

sorry for the huge delay. Unfortunately it turned out I was just 'lucky' to run
into this bug the first few times. When I later on tried to reproduce this
specific issue, I tried 20 times and couldn't, even without any patch :( So
testing especially the 2nd patch turnes out to be a bit difficult (can't be
verified by printk). 
I now also mostly only have remotely access to the test hardware and can't
reset this system remotely, so testing has become a bit difficult :(
Tomorrow will be in the lab again and try to test again.

Thanks for your help and patience,
Bernd


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