linux-kernel - Re: [syzbot] [perf?] general protection fault in inherit_task

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Date:   Tue, 31 Oct 2023 13:16:51 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     syzbot <syzbot+756fe9affda890e892ae@...kaller.appspotmail.com>
Cc:     acme@...nel.org, adrian.hunter@...el.com,
        alexander.shishkin@...ux.intel.com, bpf@...r.kernel.org,
        irogers@...gle.com, jolsa@...nel.org, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, mark.rutland@....com,
        mingo@...hat.com, namhyung@...nel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [perf?] general protection fault in inherit_task_group

On Tue, Oct 31, 2023 at 05:04:27AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    c17cda15cc86 Merge tag 'net-6.6-rc8' of git://git.kernel.o..
> git tree:       bpf
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=151ab177680000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=7d1f30869bb78ec6
> dashboard link: https://syzkaller.appspot.com/bug?extid=756fe9affda890e892ae
> compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=103b572b680000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=143a82c3680000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/d47cb341912c/disk-c17cda15.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/f37f0cf41858/vmlinux-c17cda15.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/e256afecf3c3/bzImage-c17cda15.xz
> 
> The issue was bisected to:
> 
> commit 32671e3799ca2e4590773fd0e63aaa4229e50c06
> Author: Peter Zijlstra <peterz@...radead.org>
> Date:   Wed Oct 18 11:56:54 2023 +0000
> 
>     perf: Disallow mis-matched inherited group reads
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10fdf71d680000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=12fdf71d680000
> console output: https://syzkaller.appspot.com/x/log.txt?x=14fdf71d680000

a71ef31485bb51b846e8db8b3a35e432cc15afb5 upstream