linux-kernel - Re: [syzbot] [mm?] INFO: rcu detected stall in sys

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Message-ID: <694ebb15.050a0220.35954c.0076.GAE@google.com>
Date: Fri, 26 Dec 2025 08:43:01 -0800
From: syzbot <syzbot+693a483dd6ac06c62b09@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, bigeasy@...utronix.de, bsegall@...gle.com, 
	dietmar.eggemann@....com, edumazet@...gle.com, juri.lelli@...hat.com, 
	kerneljasonxing@...il.com, kuba@...nel.org, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, mgorman@...e.de, mingo@...hat.com, netdev@...r.kernel.org, 
	pabeni@...hat.com, peterz@...radead.org, rostedt@...dmis.org, 
	syzkaller-bugs@...glegroups.com, tglx@...utronix.de, 
	vincent.guittot@...aro.org, vschneid@...hat.com
Subject: Re: [syzbot] [mm?] INFO: rcu detected stall in sys_pipe2 (2)

syzbot suspects this issue was fixed by commit:

commit 66951e4860d3c688bfa550ea4a19635b57e00eca
Author: Peter Zijlstra <peterz@...radead.org>
Date:   Mon Jan 13 12:50:11 2025 +0000

    sched/fair: Fix update_cfs_group() vs DELAY_DEQUEUE

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=16c6eb92580000
start commit:   9268abe611b0 Merge branch 'net-lan969x-add-rgmii-support'
git tree:       net-next
kernel config:  https://syzkaller.appspot.com/x/.config?x=b087c24b921cdc16
dashboard link: https://syzkaller.appspot.com/bug?extid=693a483dd6ac06c62b09
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16e7c2f8580000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: sched/fair: Fix update_cfs_group() vs DELAY_DEQUEUE

For information about bisection process see: https://goo.gl/tpsmEJ#bisection