linux-kernel - Re: [syzbot] [block?] [trace?] INFO: task hung in blk_trace

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Message-ID: <tencent_F29790365A4AF8744577D967B83C95361E09@qq.com>
Date: Wed, 31 Jan 2024 18:14:29 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+2373f6be3e6de4f92562@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [block?] [trace?] INFO: task hung in blk_trace_remove (2)

please test task hung in blk_trace_remove

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

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index d5d94510afd3..eede951d198a 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -381,8 +381,10 @@ static void blk_trace_cleanup(struct request_queue *q, struct blk_trace *bt)
 {
 	blk_trace_stop(bt);
 	synchronize_rcu();
+	mutex_unlock(&q->debugfs_mutex);
 	blk_trace_free(q, bt);
 	put_probe_ref();
+	mutex_lock(&q->debugfs_mutex);
 }
 
 static int __blk_trace_remove(struct request_queue *q)