linux-kernel - Re: [syzbot] upstream boot error: BUG: unable to handle kernel NULL pointer dereference in __dabt

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Message-ID: <CACT4Y+aMdct_tjSYsBvvtGoDji6feOiANogRbp3N41qkzU+5CQ@mail.gmail.com>
Date:   Wed, 26 Apr 2023 08:34:05 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:     syzkaller@...glegroups.com, alex.gaynor@...il.com,
        andriy.shevchenko@...ux.intel.com, bjorn3_gh@...tonmail.com,
        boqun.feng@...il.com, bpf@...r.kernel.org, gary@...yguo.net,
        linux-kernel@...r.kernel.org, linux@...musvillemoes.dk,
        ojeda@...nel.org, pmladek@...e.com, rostedt@...dmis.org,
        rust-for-linux@...r.kernel.org, senozhatsky@...omium.org,
        syzkaller-bugs@...glegroups.com, wedsonaf@...il.com
Subject: Re: [syzbot] upstream boot error: BUG: unable to handle kernel NULL
 pointer dereference in __dabt_svc

On Tue, 25 Apr 2023 at 23:36, Miguel Ojeda
<miguel.ojeda.sandonis@...il.com> wrote:
>
> Hi syzbot engineers,
>
> On Tue, Apr 25, 2023 at 10:06 PM syzbot
> <syzbot+d692037148a8169fc9dd@...kaller.appspotmail.com> wrote:
> >
> > HEAD commit:    de10553fce40 Merge tag 'x86-apic-2023-04-24' of git://git...
> > git tree:       upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=14bdae68280000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=975b8311f6b96bca
> > dashboard link: https://syzkaller.appspot.com/bug?extid=d692037148a8169fc9dd
> > compiler:       arm-linux-gnueabi-gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> > userspace arch: arm
>
> I am not sure what triggered the bot to consider Rust here -- the
> config does not enable it.
>
> What am I missing?

Hi Miguel,

The crash is in lib/vsprintf.c and:

$ scripts/get_maintainer.pl -f lib/vsprintf.c
...
rust-for-linux@...r.kernel.org (open list:RUST)
...