linux-kernel - Re: exception in interrupt during elv_completed

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Date:	Mon, 15 Aug 2011 13:48:45 -0400
From:	Dave Jones <davej@...hat.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Greg KH <greg@...ah.com>, Jens Axboe <jaxboe@...ionio.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: exception in interrupt during elv_completed_request. (3.0)

On Tue, Aug 09, 2011 at 08:48:32AM -0500, James Bottomley wrote:

 > >  > > >  > Looks like the recent SCSI removal oopses, perhaps it happened when he
 > >  > > >  > yanked it instead of directly on insertion?
 > >  > > >  
 > >  > > > sorry my bad, yes, this was on device removal.
 > >  > > > 
 > >  > > > according to the user, he did everything right, and unmounted safely.	
 > >  > > > https://bugzilla.redhat.com/show_bug.cgi?id=728872
 > >  > > 
 > >  > > James?
 > >  > 
 > >  > Should be resolved in 3.0.1 now.
 > >  > 
 > >  > If not, please let James, and me, know.
 > > 
 > > Are you talking about the scsi_dispatch_cmd fix ?  this is something else.
 > 
 > I'm not so sure ... it looks like a stray block put coming after queue
 > teardown to me.  elevator_exit() will NULL e->ops but blk_put_request()
 > uses it unconditionally.
 > 
 > That's more a fix like this, isn't it?
 > 
 > James
 > 
 > ---
 > 
 > diff --git a/block/elevator.c b/block/elevator.c
 > index a3b64bc..de4bde9 100644
 > --- a/block/elevator.c
 > +++ b/block/elevator.c
 > @@ -812,7 +812,7 @@ void elv_completed_request(struct request_queue *q, struct request *rq)
 >  	 */
 >  	if (blk_account_rq(rq)) {
 >  		q->in_flight[rq_is_sync(rq)]--;
 > -		if ((rq->cmd_flags & REQ_SORTED) &&
 > +		if ((rq->cmd_flags & REQ_SORTED) && e->ops &&
 >  		    e->ops->elevator_completed_req_fn)
 >  			e->ops->elevator_completed_req_fn(q, rq);
 >  	}

I did a build with this change for the user seeing the problem.
Apparentely, it didn't change anything.

	Dave

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