From: Marc Zyngier <maz@kernel.org>
To: syzbot <syzbot+c4aef6558d0cd90fe378@syzkaller.appspotmail.com>
Cc: catalin.marinas@arm.com, joey.gouly@arm.com,
kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, oliver.upton@linux.dev,
oupton@kernel.org, suzuki.poulose@arm.com,
syzkaller-bugs@googlegroups.com, will@kernel.org,
yuzenghui@huawei.com
Subject: Re: [syzbot] [kvmarm?] WARNING in kvm_set_vm_id_reg
Date: Sun, 16 Nov 2025 08:46:51 +0000 [thread overview]
Message-ID: <868qg6tldw.wl-maz@kernel.org> (raw)
In-Reply-To: <6918cd88.050a0220.1c914e.0044.GAE@google.com>
On Sat, 15 Nov 2025 18:59:20 +0000,
syzbot <syzbot+c4aef6558d0cd90fe378@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 7a0892d2836e Merge tag 'pci-v6.18-fixes-5' of git://git.ke..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=12c56884580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=bbf220ce32df0361
> dashboard link: https://syzkaller.appspot.com/bug?extid=c4aef6558d0cd90fe378
> 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=139c77cd980000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11d6a914580000
>
> Downloadable assets:
> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/fa3fbcfdac58/non_bootable_disk-7a0892d2.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/e83411b74df6/vmlinux-7a0892d2.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/135caed64c95/Image-7a0892d2.gz.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+c4aef6558d0cd90fe378@syzkaller.appspotmail.com
>
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 3583 at arch/arm64/kvm/sys_regs.c:2353 kvm_set_vm_id_reg+0x60/0xf4 arch/arm64/kvm/sys_regs.c:2348
> Modules linked in:
> CPU: 1 UID: 0 PID: 3583 Comm: syz.2.17 Not tainted syzkaller #0 PREEMPT
> Hardware name: linux,dummy-virt (DT)
> pstate: a1402009 (NzCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
> pc : kvm_set_vm_id_reg+0x60/0xf4 arch/arm64/kvm/sys_regs.c:2353
> lr : kvm_finalize_sys_regs+0x88/0x244 arch/arm64/kvm/sys_regs.c:5616
> sp : ffff800089543ab0
> x29: ffff800089543ab0 x28: f6f00000121c12c0 x27: 0000000000000000
> x26: 0000000000000000 x25: f1f00000085d8000 x24: 0000000000000000
> x23: f1f00000085d8048 x22: 0000000000000000 x21: f9ff800083e0dbd0
> x20: f9ff800083e0d000 x19: f1f00000085d8000 x18: 00000000ffffffff
> x17: 0000000000000000 x16: 0000000000000000 x15: ffff800089543a90
> x14: ffff800089543d98 x13: ffff800089543d5a x12: 0000000000000000
> x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000078
> x8 : ffff800089543da8 x7 : f0f0000004469ffc x6 : 0000000000000077
> x5 : f6f00000121c12c0 x4 : 0000000000000001 x3 : f9ff800083e0dd18
> x2 : 1101001020110222 x1 : 0000000000000000 x0 : f9ff800083e0d000
> Call trace:
> kvm_set_vm_id_reg+0x60/0xf4 arch/arm64/kvm/sys_regs.c:2348 (P)
> kvm_finalize_sys_regs+0x88/0x244 arch/arm64/kvm/sys_regs.c:5616
> kvm_arch_vcpu_run_pid_change+0x8c/0x36c arch/arm64/kvm/arm.c:857
> kvm_vcpu_ioctl+0x7f8/0x878 virt/kvm/kvm_main.c:4464
> vfs_ioctl fs/ioctl.c:51 [inline]
> __do_sys_ioctl fs/ioctl.c:597 [inline]
> __se_sys_ioctl fs/ioctl.c:583 [inline]
> __arm64_sys_ioctl+0xac/0x104 fs/ioctl.c:583
> __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
> invoke_syscall+0x48/0x110 arch/arm64/kernel/syscall.c:49
> el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:132
> do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:151
> el0_svc+0x34/0x10c arch/arm64/kernel/entry-common.c:746
> el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:765
> el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:596
> ---[ end trace 0000000000000000 ]---
#syz fix KVM: arm64: Finalize ID registers only once per VM
M.
--
Without deviation from the norm, progress is not possible.
prev parent reply other threads:[~2025-11-16 8:46 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-15 18:59 [syzbot] [kvmarm?] WARNING in kvm_set_vm_id_reg syzbot
2025-11-16 8:46 ` Marc Zyngier [this message]
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