From: Hillf Danton <hdanton@sina.com>
To: syzbot <syzbot+c2e074db555379260750@syzkaller.appspotmail.com>
Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [mm?] general protection fault in find_lock_task_mm
Date: Tue, 17 Dec 2024 18:31:04 +0800 [thread overview]
Message-ID: <20241217103105.151-1-hdanton@sina.com> (raw)
In-Reply-To: <67607c8c.050a0220.37aaf.013a.GAE@google.com>
On Mon, 16 Dec 2024 11:16:28 -0800
> syzbot found the following issue on:
>
> HEAD commit: 231825b2e1ff Revert "unicode: Don't special case ignorable..
> git tree: upstream
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=102844f8580000
#syz test
--- x/mm/oom_kill.c
+++ y/mm/oom_kill.c
@@ -137,7 +137,10 @@ struct task_struct *find_lock_task_mm(st
rcu_read_lock();
for_each_thread(p, t) {
+ if (!tryget_task_struct(t))
+ continue;
task_lock(t);
+ put_task_struct(t);
if (likely(t->mm))
goto found;
task_unlock(t);
--
next prev parent reply other threads:[~2024-12-17 10:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-16 19:16 [syzbot] [mm?] general protection fault in find_lock_task_mm syzbot
2024-12-17 10:31 ` Hillf Danton [this message]
2024-12-17 10:48 ` syzbot
2024-12-17 11:15 ` Hillf Danton
2024-12-17 11:34 ` syzbot
2025-01-04 14:30 ` Tetsuo Handa
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