linux-kernel - Re: [syzbot] [hams?] possible deadlock in serial8250_console

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Message-Id: <20240420060919.62280-1-aha310510@gmail.com>
Date: Sat, 20 Apr 2024 15:09:19 +0900
From: Jeongjun Park <aha310510@...il.com>
To: syzbot+8e03da5d64bc85098811@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [hams?] possible deadlock in serial8250_console_write

please test deadlock in serial8250_console_write

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

---
 drivers/net/ppp/ppp_async.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ppp/ppp_async.c b/drivers/net/ppp/ppp_async.c
index c33c3db3cc08..d12b8155e839 100644
--- a/drivers/net/ppp/ppp_async.c
+++ b/drivers/net/ppp/ppp_async.c
@@ -134,11 +134,11 @@ static struct asyncppp *ap_get(struct tty_struct *tty)
 {
 	struct asyncppp *ap;
 
-	read_lock(&disc_data_lock);
+	read_lock_irq(&disc_data_lock);
 	ap = tty->disc_data;
 	if (ap != NULL)
 		refcount_inc(&ap->refcnt);
-	read_unlock(&disc_data_lock);
+	read_unlock_irq(&disc_data_lock);
 	return ap;
 }
 
-- 
2.34.1