kernel BUG at mm/usercopy.c:102 in kvm_amd - svm_get_if_flag

[cincura.net]

Environment:

• Host kernel: 6.17.13-2-pve
• Proxmox VE: 9.1
• Host board: ASRock B450M Pro4, BIOS P5.70
• Guest firmware: SeaBIOS
• Guest CPU type: x86-64-v3

Crash message:

[Fri Apr 17 12:32:36 2026] usercopy: Kernel memory overwrite attempt detected to process stack (offset 76781155196456, size 0)!
[Fri Apr 17 12:32:36 2026] ------------[ cut here ]------------
[Fri Apr 17 12:32:36 2026] kernel BUG at mm/usercopy.c:102!
[Fri Apr 17 12:32:36 2026] Oops: invalid opcode: 0000 [#1] SMP NOPTI
[Fri Apr 17 12:32:36 2026] CPU: 3 UID: 0 PID: 2102 Comm: CPU 3/KVM Tainted: P           O        6.17.13-2-pve #1 PREEMPT(voluntary)
[Fri Apr 17 12:32:36 2026] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./B450M Pro4, BIOS P5.70 10/20/2022
[Fri Apr 17 12:32:36 2026] RIP: 0010:usercopy_abort+0x78/0x7a

Call trace:

__check_object_size.cold+0xb6/0xeb
svm_get_if_flag+0x72/0x90 [kvm_amd]
svm_interrupt_blocked+0x112/0x120 [kvm_amd]
svm_interrupt_allowed+0x34/0x80 [kvm_amd]
kvm_check_and_inject_events+0x319/0x550 [kvm]
kvm_arch_vcpu_ioctl_run+0x489/0x18c0 [kvm]
kvm_vcpu_ioctl+0x138/0xab0 [kvm]
__x64_sys_ioctl+0xa5/0x100
x64_sys_call+0x1151/0x2330
do_syscall_64+0x80/0x8f0
entry_SYSCALL_64_after_hwframe+0x76/0x7e

 

[Stoiko Ivanov]

see - https://forum.proxmox.com/threads/p...ts-in-kernel-bug-at-mm-usercopy-c-102.182232/ - seems potentially similar

what kind of workload is running on the machine - lxc-containers? - do you see any other issues in the journal before this occurs/could you share the complete journal for this boot?

Thanks!

 

[cincura.net]

No LXC containers. Only pure VMs, 5 in total. 4 of them SeaBIOS and i440fx, 1 UEFI/OVMF and i440fx. I can't share full journal, but nothing in the journal for ~5 days before this happened.