linux-kernel - Re: [syzbot] [bpf?] WARNING in maybe_exit

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Message-ID: <878qhxadxr.fsf@fau.de>
Date: Mon, 29 Sep 2025 09:57:36 +0200
From: Luis Gerhorst <luis.gerhorst@....de>
To: bpf@...r.kernel.org
Cc: andrii@...nel.org,  ast@...nel.org,  daniel@...earbox.net,
  eddyz87@...il.com,  haoluo@...gle.com,  henriette.herzog@....de,
  john.fastabend@...il.com,  jolsa@...nel.org,  kpsingh@...nel.org,
  linux-kernel@...r.kernel.org,  martin.lau@...ux.dev,  memxor@...il.com,
  sdf@...ichev.me,  song@...nel.org,  syzkaller-bugs@...glegroups.com,
  yonghong.song@...ux.dev
Subject: Re: [syzbot] [bpf?] WARNING in maybe_exit_scc

syzbot <syzbot+3afc814e8df1af64b653@...kaller.appspotmail.com> writes:

> syzbot has bisected this issue to:
>
> commit d6f1c85f22534d2d9fea9b32645da19c91ebe7d2
> Author: Luis Gerhorst <luis.gerhorst@....de>
> Date:   Tue Jun 3 21:24:28 2025 +0000
>
>     bpf: Fall back to nospec for Spectre v1
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=17753762580000
> start commit:   f83ec76bf285 Linux 6.17-rc6
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=14f53762580000
> console output: https://syzkaller.appspot.com/x/log.txt?x=10f53762580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=8f01d8629880e620
> dashboard link: https://syzkaller.appspot.com/bug?extid=3afc814e8df1af64b653
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=104a947c580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14467b62580000
>
> Reported-by: syzbot+3afc814e8df1af64b653@...kaller.appspotmail.com
> Fixes: d6f1c85f2253 ("bpf: Fall back to nospec for Spectre v1")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Sorry for the delay as I was out of office.

I will be looking into this and also [1] shortly.

[1] https://lore.kernel.org/bpf/68c8de6b.050a0220.3c6139.0d26.GAE@google.com/ ("Re: [syzbot] [bpf?] WARNING in do_check (2)")