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

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Date: Tue, 19 Dec 2023 13:23:58 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+20e9a5e0dd424a875f55@...kaller.appspotmail.com
Cc: axboe@...nel.dk,
	linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [block?] INFO: task hung in blkdev_flush_mapping

please test task hung in blkdev_flush_mapping

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5bd7ef53ffe5
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index b6414e1e645b..31656364d8a3 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -1394,6 +1394,9 @@ static int nbd_start_device(struct nbd_device *nbd)
 	}
 	set_bit(NBD_RT_HAS_PID_FILE, &config->runtime_flags);
 
+	if (num_connections == 1 && !nbd->tag_set.timeout)
+		nbd->tag_set.timeout = HZ * 1024;
+
 	nbd_dev_dbg_init(nbd);
 	for (i = 0; i < num_connections; i++) {
 		struct recv_thread_args *args;