syzbot


WARNING in kvm_set_vm_id_reg

Status: upstream: reported C repro on 2025/11/15 18:59
Subsystems: kvmarm
[Documentation on labels]
Reported-by: syzbot+c4aef6558d0cd90fe378@syzkaller.appspotmail.com
Fix commit: 0f559cd91e37 KVM: arm64: Finalize ID registers only once per VM
Patched on: [ci-qemu-gce-upstream-auto ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-snapshot-upstream-root ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-rust-kasan-gce ci2-upstream-fs], missing on: [ci-qemu-native-arm64-kvm ci-qemu2-riscv64 ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-net-this-kasan-gce ci2-upstream-kcsan-gce ci2-upstream-usb]
First crash: 12d, last: 5d08h
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [kvmarm?] WARNING in kvm_set_vm_id_reg 1 (2) 2025/11/16 08:46

Sample crash report:
------------[ 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 ]---

Crashes (23):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/11/15 18:06 upstream 7a0892d2836e f7988ea4 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/18 23:57 upstream 5bebe8de1926 ef766cd7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/18 23:56 upstream 5bebe8de1926 ef766cd7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/18 02:24 upstream e7c375b18160 ef766cd7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/18 02:22 upstream e7c375b18160 ef766cd7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/17 18:47 upstream 6a23ae0a96a6 ef766cd7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/17 18:47 upstream 6a23ae0a96a6 ef766cd7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/17 18:46 upstream 6a23ae0a96a6 ef766cd7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/17 18:46 upstream 6a23ae0a96a6 ef766cd7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/16 05:57 upstream f824272b6e3f f7988ea4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/16 05:57 upstream f824272b6e3f f7988ea4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/15 10:48 upstream 7a0892d2836e f7988ea4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/14 22:40 upstream 6da43bbeb691 6d98c1c8 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/13 02:01 upstream 24172e0d7990 07e030de .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/13 02:01 upstream 24172e0d7990 07e030de .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/13 00:52 upstream 24172e0d7990 07e030de .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/13 00:51 upstream 24172e0d7990 07e030de .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/12 23:55 upstream 24172e0d7990 07e030de .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/12 09:32 upstream 24172e0d7990 4e1406b4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/12 09:31 upstream 24172e0d7990 4e1406b4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/12 08:14 upstream 24172e0d7990 4e1406b4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/11 18:52 upstream 4427259cc7f7 4e1406b4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
2025/11/11 18:48 upstream 4427259cc7f7 4e1406b4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in kvm_set_vm_id_reg
* Struck through repros no longer work on HEAD.