Re: [2.6.14-rc1] sym scsi boot hang

[Mike Christie]

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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