Re: [syzbot] possible deadlock in input_event (2)

From: Jeongjun Park
Date: Sat Apr 20 2024 - 04:14:24 EST


please test deadlock in input_event

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

---
fs/fcntl.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/fcntl.c b/fs/fcntl.c
index 54cc85d3338e..b2d06c845a18 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -848,11 +848,11 @@ int send_sigurg(struct fown_struct *fown)
send_sigurg_to_task(p, fown, type);
rcu_read_unlock();
} else {
- read_lock(&tasklist_lock);
+ read_lock_irq(&tasklist_lock);
do_each_pid_task(pid, type, p) {
send_sigurg_to_task(p, fown, type);
} while_each_pid_task(pid, type, p);
- read_unlock(&tasklist_lock);
+ read_unlock_irq(&tasklist_lock);
}
out_unlock_fown:
read_unlock_irqrestore(&fown->lock, flags);
--
2.34.1