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

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Message-ID: <000000000000c667ce060a5cae75@google.com>
Date:   Fri, 17 Nov 2023 09:44:05 -0800
From:   syzbot <syzbot+cf93299f5a30fb4c3829@...kaller.appspotmail.com>
To:     andrii@...nel.org, ast@...nel.org, boqun.feng@...il.com,
        bpf@...r.kernel.org, brauner@...nel.org, daniel@...earbox.net,
        haoluo@...gle.com, john.fastabend@...il.com, jolsa@...nel.org,
        kpsingh@...nel.org, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, longman@...hat.com,
        martin.lau@...ux.dev, mhiramat@...nel.org,
        michael.christie@...cle.com, mingo@...hat.com, mst@...hat.com,
        oleg@...hat.com, peterz@...radead.org, rostedt@...dmis.org,
        sdf@...gle.com, song@...nel.org, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, wander@...hat.com, will@...nel.org,
        yonghong.song@...ux.dev
Subject: Re: [syzbot] [kernel?] inconsistent lock state in __lock_task_sighand

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=144ac400e80000
start commit:   f31817cbcf48 Add linux-next specific files for 20231116
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=164ac400e80000
console output: https://syzkaller.appspot.com/x/log.txt?x=124ac400e80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f59345f1d0a928c
dashboard link: https://syzkaller.appspot.com/bug?extid=cf93299f5a30fb4c3829
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=125ac3c0e80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12c4d797680000

Reported-by: syzbot+cf93299f5a30fb4c3829@...kaller.appspotmail.com
Fixes: 2d25a889601d ("ptrace: Convert ptrace_attach() to use lock guards")

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