linux-kernel - Re: [syzbot] [kvmarm?] kernel BUG in kvm_s2_put

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Message-ID: <aQJ4tQJPiGF6M9Wb@linux.dev>
Date: Wed, 29 Oct 2025 13:27:33 -0700
From: Oliver Upton <oliver.upton@...ux.dev>
To: syzbot <syzbot+c41f3ddb8299a30a98b5@...kaller.appspotmail.com>
Cc: catalin.marinas@....com, joey.gouly@....com, kvmarm@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	maz@...nel.org, suzuki.poulose@....com,
	syzkaller-bugs@...glegroups.com, will@...nel.org,
	yuzenghui@...wei.com
Subject: Re: [syzbot] [kvmarm?] kernel BUG in kvm_s2_put_page

On Wed, Oct 29, 2025 at 01:04:27PM -0700, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    10fd0285305d Merge branch kvm-arm64/selftests-6.18 into kv..
> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git next
> console output: https://syzkaller.appspot.com/x/log.txt?x=173e4fe2580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a4522b3a704e0394
> dashboard link: https://syzkaller.appspot.com/bug?extid=c41f3ddb8299a30a98b5
> compiler:       Debian clang version 20.1.8 (++20250708123704+0de59a293f7a-1~exp1~20250708003721.134), Debian LLD 20.1.8
> userspace arch: arm64
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13559c92580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12963fe2580000
> 
> Downloadable assets:
> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/fa3fbcfdac58/non_bootable_disk-10fd0285.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/65e2ebd050e3/vmlinux-10fd0285.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/9d47fc3df12e/Image-10fd0285.gz.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+c41f3ddb8299a30a98b5@...kaller.appspotmail.com

#syz fix: Revert "KVM: arm64: Reschedule as needed when destroying the stage-2 page-tables"

Just fast-forwarded kvmarm/next to 6.18-rc3 which has the fix.

Thanks,
Oliver