From: Hillf Danton <hdanton@sina.com>
To: syzbot <syzbot+00a022dc9979d67df050@syzkaller.appspotmail.com>
Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [kernel?] WARNING in enqueue_dl_entity
Date: Sat, 23 Nov 2024 10:10:58 +0800 [thread overview]
Message-ID: <20241123021058.1381-1-hdanton@sina.com> (raw)
In-Reply-To: <67410a37.050a0220.363a1b.0150.GAE@google.com>
On Fri, 22 Nov 2024 14:48:23 -0800
> syzbot has found a reproducer for the following issue on:
>
> HEAD commit: 28eb75e178d3 Merge tag 'drm-next-2024-11-21' of https://gi..
> git tree: upstream
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1016fec0580000
#syz test upstream master
--- x/kernel/sched/fair.c
+++ y/kernel/sched/fair.c
@@ -7151,8 +7151,11 @@ static int dequeue_entities(struct rq *r
idle_h_nr_running = h_nr_running;
/* end evaluation on encountering a throttled cfs_rq */
- if (cfs_rq_throttled(cfs_rq))
+ if (cfs_rq_throttled(cfs_rq)) {
+ if (rq_h_nr_running && !rq->cfs.h_nr_running)
+ dl_server_stop(&rq->fair_server);
return 0;
+ }
}
sub_nr_running(rq, h_nr_running);
--
next prev parent reply other threads:[~2024-11-23 2:11 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-28 17:15 [syzbot] [kernel?] WARNING in enqueue_dl_entity syzbot
2024-11-22 22:48 ` syzbot
2024-11-23 2:10 ` Hillf Danton [this message]
2024-11-23 2:12 ` syzbot
2024-12-13 11:03 ` Hillf Danton
2024-12-13 11:32 ` syzbot
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