Re: [syzbot] [bpf?] [trace?] possible deadlock in bpf_trace_printk

[Dmitry Vyukov]

On Wed, 22 Mar 2023 at 10:29, syzbot
<syzbot+c49e17557ddb5725583d@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit 05b24ff9b2cfabfcfd951daaa915a036ab53c9e1
> Author: Jiri Olsa <jolsa@xxxxxxxxxx>
> Date:   Fri Sep 16 07:19:14 2022 +0000
>
>     bpf: Prevent bpf program recursion for raw tracepoint probes
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10a653d6c80000
> start commit:   a335366bad13 Merge tag 'gpio-fixes-for-v6.0-rc6' of git://..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=9e66520f224211a2
> dashboard link: https://syzkaller.appspot.com/bug?extid=c49e17557ddb5725583d
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16e27480880000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12737fbf080000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: bpf: Prevent bpf program recursion for raw tracepoint probes
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Looks reasonable:

#syz fix: bpf: Prevent bpf program recursion for raw tracepoint probes