From: Al Viro <viro@zeniv.linux.org.uk>
To: syzbot <syzbot+533f389d4026d86a2a95@syzkaller.appspotmail.com>
Cc: andrii@kernel.org, ast@kernel.org, axboe@kernel.dk,
bpf@vger.kernel.org, cgroups@vger.kernel.org,
christian.brauner@ubuntu.com, christian@brauner.io,
daniel@iogearbox.net, dkadashev@gmail.com, hannes@cmpxchg.org,
john.fastabend@gmail.com, kafai@fb.com, kpsingh@kernel.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
lizefan.x@bytedance.com, netdev@vger.kernel.org,
songliubraving@fb.com, syzkaller-bugs@googlegroups.com,
tj@kernel.org, torvalds@linux-foundation.org, yhs@fb.com
Subject: Re: [syzbot] general protection fault in percpu_ref_put
Date: Tue, 21 Sep 2021 06:23:17 +0000 [thread overview]
Message-ID: <YUl6VZhPHBqAx+6g@zeniv-ca.linux.org.uk> (raw)
In-Reply-To: <000000000000f8be2b05cc788686@google.com>
On Mon, Sep 20, 2021 at 07:55:16PM -0700, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 4357f03d6611 Merge tag 'pm-5.15-rc2' of git://git.kernel.o..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=173e2d27300000
> kernel config: https://syzkaller.appspot.com/x/.config?x=ccfb8533b1cbe3b1
> dashboard link: https://syzkaller.appspot.com/bug?extid=533f389d4026d86a2a95
> compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1395c6f1300000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11568cad300000
>
> The issue was bisected to:
>
> commit 020250f31c4c75ac7687a673e29c00786582a5f4
> Author: Dmitry Kadashev <dkadashev@gmail.com>
> Date: Thu Jul 8 06:34:43 2021 +0000
>
> namei: make do_linkat() take struct filename
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=137e8a4b300000
> final oops: https://syzkaller.appspot.com/x/report.txt?x=10fe8a4b300000
> console output: https://syzkaller.appspot.com/x/log.txt?x=177e8a4b300000
I would be very surprised if that was true. After the first step of bisect
you've traded one oops for another, and *that* went to do_linkat() breakage.
Which should be fixed by fdfc346302a7.
Look at the oopsen - initial and final ones look very different.
prev parent reply other threads:[~2021-09-21 6:23 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-21 2:55 [syzbot] general protection fault in percpu_ref_put syzbot
2021-09-21 6:23 ` Al Viro [this message]
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