Re: [syzbot] [PATCH] Test for 4652b8e4f3ff

[syzbot <syzbot+fcc47ba2476570cbbeb0@syzkaller.appspotmail.com>]

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Subject: [PATCH] Test for 4652b8e4f3ff
Author: eadavis@qq.com

please test warning in blk_mq_start_request

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 4652b8e4f3ff

diff --git a/block/blk-mq.c b/block/blk-mq.c
index e2d11183f62e..26f2921cbc50 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2575,6 +2575,8 @@ static blk_status_t __blk_mq_issue_directly(struct blk_mq_hw_ctx *hctx,
 	 * Any other error (busy), just add it to our list as we
 	 * previously would have done.
 	 */
+	if (READ_ONCE(rq->state))
+		WRITE_ONCE(rq->state, MQ_RQ_IDLE);
 	ret = q->mq_ops->queue_rq(hctx, &bd);
 	switch (ret) {
 	case BLK_STS_OK: