Re: [2.6.14-rc1] sym scsi boot hang

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Alan Stern wrote:
On Wed, 14 Sep 2005, Anton Blanchard wrote:


Hi,


If that's the cause, it's probably a double down of the host scan
semaphore somewhere in the code.  alt-sysrq-t should work in this case,
can you get a stack trace of the blocked process?

It appears to be this patch:

 [SCSI] SCSI core: fix leakage of scsi_cmnd's

 From:         Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>


And in particular it looks like the scsi_unprep_request in
scsi_queue_insert is causing it. The following patch fixes the boot
problems on the vscsi machine:


In general the scsi_unprep_request routine is correct and needs to be
there.  The one part that might be questionable is the assignment to
req->special.  It may turn out that the real solution is to have
scsi_execute set req->special to NULL; I assumed it would be NULL already
but perhaps I was wrong.

I think we have scsi_execute and friends setting REQ_SPECIAL. This is could cause a problem becuase it does not have a scsi_request.
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