[Bug 12195] "dd" make kernel panic

[bugme-daemon@bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=12195





------- Comment #5 from anonymous@kernel-bugs.osdl.org  2008-12-11 07:17 -------
Reply-To: James.Bottomley@HansenPartnership.com

On Thu, 2008-12-11 at 01:05 -0800, bugme-daemon@bugzilla.kernel.org
wrote:
> I instrumented kernel. below is some finding.
> 1) The disk isn't stable. If we run dd in a loop, sometimes the disk doesn't
> work, so block request will expire to start a scsi error handling;
> 2) fussion driver has its own periodic (1 sec) checking in
> mpt_fault_reset_work. If something is wrong, it will do a hardware reset and
> flush all pending requests;
> 3) Step 1) and 2) have a race that a request might be flushed in step 2), but
> step 1) releases the request firstly. Later on, when SOFTIRQ tries to release
> the scsi_cmnd, kernel panic.

OK, so to rule out the block timer problems which we think are fixed,
could you reproduce on 2.6.28-rc8.

Also, the routine 

> [<a000000100391cf0>] scsi_softirq_done+0x50/0x2e0
>                                 sp=e000000008a97e10 bsp=e000000008a90d70

Is hard to diagnose. Could you ask gdb or addr2line which actual source
line this is?

Thanks,

James


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