linux-kernel - Re: [syzbot] [mm?] general protection fault in sys

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Message-ID: <56fcb1ba-b9c1-4ec5-b1c5-dc90e3d81552@lucifer.local>
Date: Wed, 2 Apr 2025 12:49:37 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: syzbot <syzbot+e3385f43b2897a19be24@...kaller.appspotmail.com>
Cc: akpm@...ux-foundation.org, jannh@...gle.com, liam.howlett@...cle.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        syzkaller-bugs@...glegroups.com, vbabka@...e.cz
Subject: Re: [syzbot] [mm?] general protection fault in sys_mremap

On Wed, Apr 02, 2025 at 04:46:03AM -0700, syzbot wrote:
> Hello,
>
> syzbot has tested the proposed patch but the reproducer is still triggering an issue:
> unregister_netdevice: waiting for DEV to become free
>
> unregister_netdevice: waiting for batadv0 to become free. Usage count = 3

Yeah... this looks like a syzbot snafu.

I have tested the fix against the repro _manually_ and confirmed it works.

But I guess, let's try again? For the sake of... something :P

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/ mm-stable

>
>
> Tested on:
>
> commit:         e20706d5 mseal sysmap: add arch-support txt
> git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/ mm-stable
> console output: https://syzkaller.appspot.com/x/log.txt?x=167a694c580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=ccf540055069887f
> dashboard link: https://syzkaller.appspot.com/bug?extid=e3385f43b2897a19be24
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
>
> Note: no patches were applied.