Commit 7568615c authored Feb 13, 2015 by Tony Battersby Committed by James Bottomley Feb 17, 2015

sg: fix unkillable I/O wait deadlock with scsi-mq

When using the write()/read() interface for submitting commands, the
SCSI generic driver does not call blk_put_request() on a completed SCSI
command until userspace calls read() to get the command completion.
Since scsi-mq uses a fixed number of preallocated requests, this makes
it possible for userspace to exhaust the entire preallocated supply of
requests. For places in the kernel that call blk_get_request() with
GFP_KERNEL, this can cause the calling process to deadlock in a
permanent unkillable I/O wait in blk_get_request() -> ... -> bt_get().
For places in the kernel that call blk_get_request() with GFP_ATOMIC,
this can cause blk_get_request() always to return -EWOULDBLOCK. Note
that these problems happen only if scsi-mq is enabled. Prevent the
problems by calling blk_put_request() as soon as the SCSI command
completes instead of waiting for userspace to call read().

Cc: <stable@vger.kernel.org> # 3.17+
Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
Acked-by: Douglas Gilbert <dgilbert@interlog.com>
Tested-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

parent 3b524a68

drivers/scsi/sg.c

+14 −3

Original line number	Diff line number	Diff line
		@@ -1335,6 +1335,17 @@ sg_rq_end_io(struct request *rq, int uptodate)
		}
		/* Rely on write phase to clean out srp status values, so no "else" */

		/*
		* Free the request as soon as it is complete so that its resources
		* can be reused without waiting for userspace to read() the
		* result. But keep the associated bio (if any) around until
		* blk_rq_unmap_user() can be called from user context.
		*/
		srp->rq = NULL;
		if (rq->cmd != rq->__cmd)
		kfree(rq->cmd);
		__blk_put_request(rq->q, rq);

		write_lock_irqsave(&sfp->rq_list_lock, iflags);
		if (unlikely(srp->orphan)) {
		if (sfp->keep_orphan)
		@@ -1762,10 +1773,10 @@ sg_finish_rem_req(Sg_request *srp)
		SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
		"sg_finish_rem_req: res_used=%d\n",
		(int) srp->res_used));
		if (srp->rq) {
		if (srp->bio)
		ret = blk_rq_unmap_user(srp->bio);

		if (srp->rq) {
		if (srp->rq->cmd != srp->rq->__cmd)
		kfree(srp->rq->cmd);
		blk_put_request(srp->rq);