linux-kernel - Re: [syzbot] [bpf?] [trace?] possible deadlock in bpf_trace

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Date:   Thu, 23 Mar 2023 12:30:48 +0100
From:   Jiri Olsa <olsajiri@...il.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+c49e17557ddb5725583d@...kaller.appspotmail.com>,
        andrii@...nel.org, ast@...nel.org, boqun.feng@...il.com,
        bpf@...r.kernel.org, daniel@...earbox.net, davem@...emloft.net,
        fgheet255t@...il.com, haoluo@...gle.com, hawk@...nel.org,
        hdanton@...a.com, john.fastabend@...il.com, kafai@...com,
        kpsingh@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, longman@...hat.com,
        martin.lau@...ux.dev, mingo@...hat.com, netdev@...r.kernel.org,
        peterz@...radead.org, rostedt@...dmis.org, sdf@...gle.com,
        song@...nel.org, songliubraving@...com,
        syzkaller-bugs@...glegroups.com, will@...nel.org, yhs@...com
Subject: Re: [syzbot] [bpf?] [trace?] possible deadlock in bpf_trace_printk

On Thu, Mar 23, 2023 at 08:50:10AM +0100, Dmitry Vyukov wrote:
> On Wed, 22 Mar 2023 at 10:29, syzbot
> <syzbot+c49e17557ddb5725583d@...kaller.appspotmail.com> wrote:
> >
> > syzbot suspects this issue was fixed by commit:
> >
> > commit 05b24ff9b2cfabfcfd951daaa915a036ab53c9e1
> > Author: Jiri Olsa <jolsa@...nel.org>
> > 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

agreed, thanks

jirka