Hello, looks like a955cad84cdaffa282b3cf8f5ce69e9e5655e585 is problematic with old Core2, when launching VM (openbsd smp): Dec 17 22:40:28 merkur kernel: BUG: kernel NULL pointer dereference, address: 0000000000000025 Dec 17 22:40:28 merkur kernel: #PF: supervisor read access in kernel mode Dec 17 22:40:28 merkur kernel: #PF: error_code(0x0000) - not-present page Dec 17 22:40:28 merkur kernel: PGD 0 P4D 0 Dec 17 22:40:28 merkur kernel: Oops: 0000 [#1] PREEMPT SMP PTI Dec 17 22:40:28 merkur kernel: CPU: 1 PID: 346 Comm: qemu-build Not tainted 5.16.0-rc5-amd64 #1 Dec 17 22:40:28 merkur kernel: Hardware name: /DG35EC, BIOS ECG3510M.86A.0118.2010.0113.1426 01/13/2010 Dec 17 22:40:28 merkur kernel: RIP: 0010:direct_page_fault+0x5f5/0x780 [kvm] Dec 17 22:40:28 merkur kernel: Code: 71 80 c5 e3 48 8b 34 24 48 8b 86 a0 02 00 00 48 8b 40 40 48 8b 0d 83 93 1f e4 48 c1 e8 06 48 83 e0 c0 48 8b 4c 01 28 45 31 ed <f6> 41 25 08 48 8b 54 24 10 75 4a 48 8b 06 80 79 20 00 75 0b 8a 49 Dec 17 22:40:28 merkur kernel: RSP: 0018:ffffb9330055f9e0 EFLAGS: 00010246 Dec 17 22:40:28 merkur kernel: RAX: 00000000000c5740 RBX: 0000000000000000 RCX: 0000000000000000 Dec 17 22:40:28 merkur kernel: RDX: 000000000000e6a1 RSI: ffffa38a4a810000 RDI: ffffb933005c5000 Dec 17 22:40:28 merkur kernel: RBP: ffffb9330055fa48 R08: ffffb9330055f838 R09: 0000000000000000 Dec 17 22:40:28 merkur kernel: R10: 0000000000000126 R11: 0000000000000003 R12: 0000000000000000 Dec 17 22:40:28 merkur kernel: R13: 0000000000000000 R14: 00000000000fe05b R15: 0000000000000001 Dec 17 22:40:28 merkur kernel: FS: 00007f3bbd196640(0000) GS:ffffa38abf280000(0000) knlGS:0000000000000000 Dec 17 22:40:28 merkur kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Dec 17 22:40:28 merkur kernel: CR2: 0000000000000025 CR3: 0000000003c7c000 CR4: 00000000000026e0 Dec 17 22:40:28 merkur kernel: Call Trace: Dec 17 22:40:28 merkur kernel: <TASK> Dec 17 22:40:28 merkur kernel: kvm_mmu_page_fault+0xe8/0x2c0 [kvm] Dec 17 22:40:28 merkur kernel: vmx_handle_exit+0x9/0x40 [kvm_intel] Dec 17 22:40:28 merkur kernel: vcpu_enter_guest+0x1702/0x24a0 [kvm] Dec 17 22:40:28 merkur kernel: ? update_load_avg+0x188/0x4e0 Dec 17 22:40:28 merkur kernel: ? get_mem_cgroup_from_objcg+0x50/0x60 Dec 17 22:40:28 merkur kernel: ? vmx_set_msr+0xa0b/0xc00 [kvm_intel] Dec 17 22:40:28 merkur kernel: ? kvm_set_msr_common+0x971/0xd10 [kvm] Dec 17 22:40:28 merkur kernel: ? kvm_arch_vcpu_ioctl+0xc77/0xf00 [kvm] Dec 17 22:40:28 merkur kernel: ? vmx_vcpu_put+0x10/0x1d0 [kvm_intel] Dec 17 22:40:28 merkur kernel: ? vmx_vcpu_load+0x18/0x30 [kvm_intel] Dec 17 22:40:28 merkur kernel: ? kvm_arch_vcpu_put+0xf6/0x110 [kvm] Dec 17 22:40:28 merkur kernel: ? vcpu_put+0x1c/0x40 [kvm] Dec 17 22:40:28 merkur kernel: ? kvm_arch_vcpu_ioctl+0xca1/0xf00 [kvm] Dec 17 22:40:28 merkur kernel: ? vmx_vcpu_load+0x18/0x30 [kvm_intel] Dec 17 22:40:28 merkur kernel: vcpu_run+0x6f/0x310 [kvm] Dec 17 22:40:28 merkur kernel: kvm_arch_vcpu_ioctl_run+0x317/0x4c0 [kvm] Dec 17 22:40:28 merkur kernel: kvm_vcpu_ioctl+0x490/0x520 [kvm] Dec 17 22:40:28 merkur kernel: ? wake_up_q+0x41/0x80 Dec 17 22:40:28 merkur kernel: ? __fget_files+0xd8/0xf0 Dec 17 22:40:28 merkur kernel: __x64_sys_ioctl+0xc10/0xd00 Dec 17 22:40:28 merkur kernel: ? do_futex+0x118/0x1c0 Dec 17 22:40:28 merkur kernel: ? __x64_sys_futex+0x125/0x190 Dec 17 22:40:28 merkur kernel: do_syscall_64+0x43/0x90 Dec 17 22:40:28 merkur kernel: entry_SYSCALL_64_after_hwframe+0x44/0xae Dec 17 22:40:28 merkur kernel: RIP: 0033:0x7f3bbe9d559b Dec 17 22:40:28 merkur kernel: Code: ff ff ff 85 c0 79 9b 49 c7 c4 ff ff ff ff 5b 5d 4c 89 e0 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a5 a8 0c 00 f7 d8 64 89 01 48 Dec 17 22:40:28 merkur kernel: RSP: 002b:00007f3bbd1955b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 Dec 17 22:40:28 merkur kernel: RAX: ffffffffffffffda RBX: 000000000000ae80 RCX: 00007f3bbe9d559b Dec 17 22:40:28 merkur kernel: RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000012 Dec 17 22:40:28 merkur kernel: RBP: 000055fd828fa860 R08: 000055fd8104af58 R09: 00007f3b700040b8 Dec 17 22:40:28 merkur kernel: R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000000000 Dec 17 22:40:28 merkur kernel: R13: 000055fd8108eb78 R14: 0000000000000000 R15: 00007f3bbd196640 Dec 17 22:40:28 merkur kernel: </TASK> Dec 17 22:40:28 merkur kernel: Modules linked in: vhost_net vhost vhost_iotlb tun auth_rpcgss nfsv4 dns_resolver nfs lockd grace sunrpc lzo_rle zram zsmalloc cpufreq_powersave i915 kvm_intel video intel_gtt iosf_mbi bridge ttm e1000e i2c_algo_bit iTCO_wdt 8250 kvm 8250_base drm_kms_helper serial_core lpc_ich stp irqbypass mfd_core evdev llc sysimgblt syscopyarea sysfillrect acpi_cpufreq button processor fb_sys_fops drm backlight i2c_core sch_fq_codel ip_tables x_tables ipv6 autofs4 btrfs raid6_pq xor zstd_decompress zstd_compress lzo_decompress lzo_compress libcrc32c crc32c_generic ecb xts dm_crypt dm_mod sd_mod t10_pi hid_generic usbhid hid uhci_hcd ahci libahci ehci_pci ehci_hcd usbcore pata_jmicron sata_sil24 usb_common Dec 17 22:40:28 merkur kernel: CR2: 0000000000000025 Dec 17 22:40:28 merkur kernel: ---[ end trace 1e1aaa4a15aaeb25 ]--- Dec 17 22:40:28 merkur kernel: RIP: 0010:direct_page_fault+0x5f5/0x780 [kvm] Dec 17 22:40:28 merkur kernel: Code: 71 80 c5 e3 48 8b 34 24 48 8b 86 a0 02 00 00 48 8b 40 40 48 8b 0d 83 93 1f e4 48 c1 e8 06 48 83 e0 c0 48 8b 4c 01 28 45 31 ed <f6> 41 25 08 48 8b 54 24 10 75 4a 48 8b 06 80 79 20 00 75 0b 8a 49 Dec 17 22:40:28 merkur kernel: RSP: 0018:ffffb9330055f9e0 EFLAGS: 00010246 Dec 17 22:40:28 merkur kernel: RAX: 00000000000c5740 RBX: 0000000000000000 RCX: 0000000000000000 Dec 17 22:40:28 merkur kernel: RDX: 000000000000e6a1 RSI: ffffa38a4a810000 RDI: ffffb933005c5000 Dec 17 22:40:28 merkur kernel: RBP: ffffb9330055fa48 R08: ffffb9330055f838 R09: 0000000000000000 Dec 17 22:40:28 merkur kernel: R10: 0000000000000126 R11: 0000000000000003 R12: 0000000000000000 Dec 17 22:40:28 merkur kernel: R13: 0000000000000000 R14: 00000000000fe05b R15: 0000000000000001 Dec 17 22:40:28 merkur kernel: FS: 00007f3bbd196640(0000) GS:ffffa38abf280000(0000) knlGS:0000000000000000 Dec 17 22:40:28 merkur kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Dec 17 22:40:28 merkur kernel: CR2: 0000000000000025 CR3: 0000000003c7c000 CR4: 00000000000026e0 Dec 17 22:40:28 merkur kernel: note: qemu-build[346] exited with preempt_count 1 model name : Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good nopl cpuid aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm pti tpr_shadow dtherm vmx flags : tsc_offset vtpr Z.
