linux-kernel - Re: [syzbot] [PATCH] Test for 4652b8e4f3ff

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Message-ID: <00000000000092b9a206099a1b69@google.com>
Date:   Tue, 07 Nov 2023 17:35:52 -0800
From:   syzbot <syzbot+fcc47ba2476570cbbeb0@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [PATCH] Test for 4652b8e4f3ff

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Subject: [PATCH] Test for 4652b8e4f3ff
Author: eadavis@...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/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c
index 22a3cf7f32e2..0726534a5a24 100644
--- a/drivers/block/null_blk/main.c
+++ b/drivers/block/null_blk/main.c
@@ -1724,6 +1724,8 @@ static blk_status_t null_queue_rq(struct blk_mq_hw_ctx *hctx,
 	cmd->fake_timeout = should_timeout_request(rq) ||
 		blk_should_fake_timeout(rq->q);
 
+	if (READ_ONCE(rq->state))
+		WRITE_ONCE(rq->state, MQ_RQ_IDLE);
 	blk_mq_start_request(rq);
 
 	if (should_requeue_request(rq)) {