Re: [syzbot] [kernel?] inconsistent lock state in __lock_task_sighand

[syzbot]

syzbot has bisected this issue to:

commit 2d25a889601d2fbc87ec79b30ea315820f874b78
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 2d25a889601d ("ptrace: Convert ptrace_attach() to use lock guards")

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