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

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Message-ID: <bee2d5f5-db93-42f1-829e-3fd250649ca8@lucifer.local>
Date: Wed, 2 Apr 2025 14:02:54 +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 05:51:02AM -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

OK so this looks like a broken test box.

For belts and suspenders purposes, I confirmed this repro, and the previously
reported one both work fine on mm-stable.

All is good, the issue is resolved :) just a matter of waiting for the merge to
mainline for this.

#syz fix: mm/mremap: do not set vrm->vma NULL immediately prior to checking it

>
>
> 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=13bf9998580000
> 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.