linux-kernel - Re: [syzbot] [kernel?] inconsistent lock state in ptrace

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Message-ID: <20231117092730.GK8262@noisy.programming.kicks-ass.net>
Date:   Fri, 17 Nov 2023 10:27:30 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     syzbot <syzbot+cbb25bb9b4d29a773985@...kaller.appspotmail.com>
Cc:     boqun.feng@...il.com, brauner@...nel.org,
        linux-kernel@...r.kernel.org, longman@...hat.com,
        michael.christie@...cle.com, mingo@...hat.com, mst@...hat.com,
        oleg@...hat.com, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, wander@...hat.com, will@...nel.org
Subject: Re: [syzbot] [kernel?] inconsistent lock state in ptrace_attach

On Fri, Nov 17, 2023 at 12:49:04AM -0800, syzbot wrote:
> syzbot has bisected this issue to:
> 
> commit 2d25a889601d2fbc87ec79b30ea315820f874b78
> Author: Peter Zijlstra <peterz@...radead.org>
> Date:   Sun Sep 17 11:24:21 2023 +0000
> 
>     ptrace: Convert ptrace_attach() to use lock guards
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=132b7d84e80000
> start commit:   f31817cbcf48 Add linux-next specific files for 20231116
> git tree:       linux-next
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=10ab7d84e80000
> console output: https://syzkaller.appspot.com/x/log.txt?x=172b7d84e80000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=f59345f1d0a928c
> dashboard link: https://syzkaller.appspot.com/bug?extid=cbb25bb9b4d29a773985
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1014d797680000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11b1ec67680000
> 
> Reported-by: syzbot+cbb25bb9b4d29a773985@...kaller.appspotmail.com
> Fixes: 2d25a889601d ("ptrace: Convert ptrace_attach() to use lock guards")

Hurmph, let me pull that patch from tip and go have a look. Thanks!