linux-kernel - 3.1.0-rc4: oops at elv_put

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Date:	Mon, 12 Sep 2011 00:36:35 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	axboe@...nel.dk, jbottomley@...allels.com,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: 3.1.0-rc4: oops at elv_put_request()

Caught this one, there was no real load at the moment.
FWIW, setup is ext4 over RAID-6 across 4 disks.

	elv_put_request
	__blk_put_request
	blk_put_request
	scsi_execute
	scsi_execute_req
	scsi_test_unit_ready
	sd_check_events
	disk_events_workfn
	process_one_work
	worker_thread
	kthread
	kernel_thread_helper

$ addr2line -e vmlinux 0xffffffff811bcbbb
block/elevator.c:772

   768	void elv_put_request(struct request_queue *q, struct request *rq)
   769	{
   770		struct elevator_queue *e = q->elevator;
   771	
   772	===>	if (e->ops->elevator_put_req_fn)	<===
   773			e->ops->elevator_put_req_fn(rq);
   774	}
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