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

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Message-ID: <67dfafcf.050a0220.31a16b.0058.GAE@google.com>
Date: Sat, 22 Mar 2025 23:53:03 -0700
From: syzbot <syzbot+17bc8c5157022e18da8b@...kaller.appspotmail.com>
To: apparmor-owner@...ts.ubuntu.com, apparmor@...ts.ubuntu.com, 
	edumazet@...gle.com, jmorris@...ei.org, john.johansen@...onical.com, 
	john@...armor.net, kuba@...nel.org, kuniyu@...zon.com, 
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-security-module@...r.kernel.org, netdev@...r.kernel.org, 
	paul@...l-moore.com, penguin-kernel@...ove.sakura.ne.jp, razor@...ckwall.org, 
	serge@...lyn.com, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net] INFO: rcu detected stall in sys_getdents64

syzbot suspects this issue was fixed by commit:

commit e759e1e4a4bd2926d082afe56046a90224433a31
Author: Eric Dumazet <edumazet@...gle.com>
Date:   Wed Jan 29 14:27:26 2025 +0000

    net: revert RTNL changes in unregister_netdevice_many_notify()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1084f004580000
start commit:   fc20a3e57247 Merge tag 'for-linus-6.12a-rc2-tag' of git://..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=ba92623fdea824c9
dashboard link: https://syzkaller.appspot.com/bug?extid=17bc8c5157022e18da8b
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=135f7d27980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1483b380580000

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

#syz fix: net: revert RTNL changes in unregister_netdevice_many_notify()

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