netdev - Re: [syzbot] [net?] WARNING: suspicious RCU usage in br_mst_set

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Message-ID: <E54F417D-8F71-4A15-8A12-30D21AB3D08D@blackwall.org>
Date: Sat, 08 Jun 2024 21:19:42 +0300
From: Nikolay Aleksandrov <razor@...ckwall.org>
To: syzbot <syzbot+9bbe2de1bc9d470eb5fe@...kaller.appspotmail.com>,
 akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] WARNING: suspicious RCU usage in br_mst_set_state (2)

On June 8, 2024 8:29:23 PM GMT+03:00, syzbot <syzbot+9bbe2de1bc9d470eb5fe@...kaller.appspotmail.com> wrote:
>Hello,
>
>syzbot found the following issue on:
>
>HEAD commit:    8a92980606e3 Merge tag 'scsi-fixes' of git://git.kernel.or..
>git tree:       upstream
>console output: https://syzkaller.appspot.com/x/log.txt?x=14f9eaba980000
>kernel config:  https://syzkaller.appspot.com/x/.config?x=9a6ac4277fffe3ea
>dashboard link: https://syzkaller.appspot.com/bug?extid=9bbe2de1bc9d470eb5fe
>compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
>
>Unfortunately, I don't have any reproducer for this issue yet.
>
>Downloadable assets:
>disk image: https://storage.googleapis.com/syzbot-assets/e77750e429bf/disk-8a929806.raw.xz
>vmlinux: https://storage.googleapis.com/syzbot-assets/910e4410cf78/vmlinux-8a929806.xz
>kernel image: https://storage.googleapis.com/syzbot-assets/85542820b0d5/bzImage-8a929806.xz
>
>IMPORTANT: if you fix the issue, please add the following tag to the commit:
>Reported-by: syzbot+9bbe2de1bc9d470eb5fe@: 

Oh, my fix was incomplete, I should've changed the deref helper as well.
I will send a patch tomorrow.

Thanks!