linux-kernel - Re: [syzbot] [maple-tree?] BUG: unable to handle kernel paging request in mas

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Date: Tue, 4 Jun 2024 14:08:42 -0400
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: syzbot <syzbot+c67d06ab25a9bc4adf35@...kaller.appspotmail.com>
Cc: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, maple-tree@...ts.infradead.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [maple-tree?] BUG: unable to handle kernel paging
 request in mas_walk

* syzbot <syzbot+c67d06ab25a9bc4adf35@...kaller.appspotmail.com> [240603 22:23]:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    4a4be1ad3a6e Revert "vfs: Delete the associated dentry whe..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=128638ba980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=bd6024aedb15e15c
> dashboard link: https://syzkaller.appspot.com/bug?extid=c67d06ab25a9bc4adf35
> compiler:       aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> userspace arch: arm64
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=106f71aa980000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16b4ffc6980000
> 
> Downloadable assets:
> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/384ffdcca292/non_bootable_disk-4a4be1ad.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/75957361122b/vmlinux-4a4be1ad.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/6c766b0ec377/Image-4a4be1ad.gz.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+c67d06ab25a9bc4adf35@...kaller.appspotmail.com
> 
> Unable to handle kernel paging request at virtual address 00700000077b9b78

I don't think the bot is testing my forced update of the tree, so I'll
try again.

#sys test git://git.infradead.org/users/jedix/linux-maple.git syz_20240603_v2

This is a revert a some patches - which seems to stop all the crashing
for me.

Looks to be the same as this [1] syzbot report.  All seem to be related
to madvise and these patches are the last to modify the area (besides
mseal() specifically calling out madvise, but that would not cause the
issue).

The patches I revered also name arm64 as special.

[1] https://syzkaller.appspot.com/bug?extid=7eaa0d7b9fccf21052f1