From: Hillf Danton <hdanton@sina.com>
To: syzbot <syzbot+78147abe6c524f183ee9@syzkaller.appspotmail.com>
Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [kernel?] general protection fault in remove_waiter
Date: Wed, 29 Apr 2026 06:01:49 +0800 [thread overview]
Message-ID: <20260428220150.2264-1-hdanton@sina.com> (raw)
In-Reply-To: <69f114ac.050a0220.ac8b.0003.GAE@google.com>
> Date: Tue, 28 Apr 2026 13:12:28 -0700 [thread overview]
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 897d54018cc9 Merge tag 'fbdev-for-7.1-rc1-2' of git://git...
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=172c32ce580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=59da38148f3a3d24
> dashboard link: https://syzkaller.appspot.com/bug?extid=78147abe6c524f183ee9
> compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10c7f273980000
#syz test
--- x/kernel/locking/rtmutex.c
+++ y/kernel/locking/rtmutex.c
@@ -1558,6 +1558,8 @@ static void __sched remove_waiter(struct
lockdep_assert_held(&lock->wait_lock);
+ if (!waiter_task)
+ return;
scoped_guard(raw_spinlock, &waiter_task->pi_lock) {
rt_mutex_dequeue(lock, waiter);
waiter_task->pi_blocked_on = NULL;
--
next prev parent reply other threads:[~2026-04-28 22:02 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-28 20:12 [syzbot] [kernel?] general protection fault in remove_waiter syzbot
2026-04-28 22:01 ` Hillf Danton [this message]
2026-04-28 22:27 ` syzbot
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