[Bug 12195] "dd" make kernel panic

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





------- Comment #3 from yanmin_zhang@linux.intel.com  2008-12-11 01:05 -------
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.


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