linux-kernel - Re: [syzbot] [tomoyo?] INFO: rcu detected stall in security_file

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Message-ID: <CANn89iKY6JzgwDpANsniAaDUP8H1QXyuTzpE2YyRMXzwkSWRcA@mail.gmail.com>
Date: Fri, 2 Aug 2024 09:21:13 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: syzbot <syzbot+67defecaa74f7dd0a5d3@...kaller.appspotmail.com>
Cc: jmorris@...ei.org, kuba@...nel.org, linux-kernel@...r.kernel.org, 
	linux-security-module@...r.kernel.org, paul@...l-moore.com, 
	penguin-kernel@...ove.sakura.ne.jp, serge@...lyn.com, 
	syzkaller-bugs@...glegroups.com, takedakn@...data.co.jp, 
	tomoyo-dev-en-owner@...ts.osdn.me, tomoyo-dev-en@...ts.osdn.me, 
	vladimir.oltean@....com
Subject: Re: [syzbot] [tomoyo?] INFO: rcu detected stall in
 security_file_ioctl (8)

On Fri, Aug 2, 2024 at 5:07 AM syzbot
<syzbot+67defecaa74f7dd0a5d3@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit e634134180885574d1fe7aa162777ba41e7fcd5b
> Author: Vladimir Oltean <vladimir.oltean@....com>
> Date:   Mon May 27 15:39:54 2024 +0000
>
>     net/sched: taprio: make q->picos_per_byte available to fill_sched_entry()
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=16a9066d980000
> start commit:   0450d2083be6 Merge tag '6.10-rc-smb-fix' of git://git.samb..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=17ffd15f654c98ba
> dashboard link: https://syzkaller.appspot.com/bug?extid=67defecaa74f7dd0a5d3
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17109b3f180000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10bcb2a4980000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: net/sched: taprio: make q->picos_per_byte available to fill_sched_entry()
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

This seems legit, according to the repro.

#syz fix: net/sched: taprio: make q->picos_per_byte available to
fill_sched_entry()