Hi, since updating my home desktop machine to kernel 5.1.1, KVM guests started on that machine segfault after booting: general protection fault: 0000 [#1] PREEMPT SMP NOPTI CPU: 0 PID: 13 Comm: kworker/0:1 Not tainted 5.0.13-zgsrv20080 #5.0.13.20190505.0 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Workqueue: events once_deferred RIP: 0010:native_read_pmc+0x2/0x10 Code: e2 20 89 3e 48 09 d0 c3 89 f9 89 f0 0f 30 c3 66 0f 1f 84 00 00 00 00 00 89 f0 89 f9 0f 30 31 c0 c3 0f 1f 80 00 00 00 00 89 f9 <0f> 33 48 c1 e2 20 48 09 d0 c3 0f 1f 40 00 0f 20 c0 c3 66 66 2e 0f RSP: 0018:ffff8881b9a03e50 EFLAGS: 00010083 RAX: 0000000000000001 RBX: ffff800000000001 RCX: 0000000000000000 RDX: 000000000000002f RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8881b590e400 R08: ffff8881b590e400 R09: 0000000000000003 R10: ffffe8ffffc05440 R11: 0000000000000000 R12: ffff8881b590e5d8 R13: 0000000000000010 R14: ffff8881b590e420 R15: ffffe8ffffc05400 FS: 0000000000000000(0000) GS:ffff8881b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9bcc5c61f8 CR3: 00000001b6a24000 CR4: 00000000000006f0 Call Trace: <IRQ> x86_perf_event_update+0x3b/0x80 x86_pmu_stop+0x84/0xa0 x86_pmu_del+0x52/0x160 event_sched_out.isra.59+0x95/0x190 group_sched_out.part.61+0x51/0xc0 ctx_sched_out+0xf2/0x220 ctx_resched+0xb8/0xc0 __perf_install_in_context+0x175/0x1f0 remote_function+0x3e/0x50 flush_smp_call_function_queue+0x30/0xe0 smp_call_function_interrupt+0x2f/0x40 call_function_single_interrupt+0xf/0x20 </IRQ> RIP: 0010:smp_call_function_many+0x1ca/0x230 Code: ee 89 c7 e8 e8 f5 51 00 3b 05 a6 23 db 00 0f 83 b2 fe ff ff 48 63 d0 48 8b 0b 48 03 0c d5 20 28 db 81 8b 51 18 83 e2 01 74 0a <f3> 90 8b 51 18 83 e2 01 75 f6 eb c8 48 c7 c2 60 17 e9 81 48 89 ee RSP: 0018:ffffc90000cc3d48 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff04 RAX: 0000000000000001 RBX: ffff8881b9a21e00 RCX: ffff8881b9a647c0 RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff8881b9a21e08 RBP: ffff8881b9a21e08 R08: 000000000000003e R09: 0000000000000000 R10: ffffffff81c04584 R11: 0000000000000000 R12: ffffffff81027af0 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000008 ? arch_unregister_cpu+0x20/0x20 ? smp_call_function_many+0x1a8/0x230 ? inet_ehashfn+0x29/0x100 ? arch_unregister_cpu+0x20/0x20 ? inet_ehashfn+0x2a/0x100 smp_call_function+0x20/0x40 on_each_cpu+0x18/0x70 ? inet_ehashfn+0x29/0x100 ? inet_ehashfn+0x2a/0x100 text_poke_bp+0x8d/0xda __jump_label_transform+0x10d/0x120 arch_jump_label_transform+0x21/0x30 __jump_label_update+0x70/0xe0 static_key_disable_cpuslocked+0x54/0x80 static_key_disable+0x11/0x20 once_deferred+0x1a/0x30 process_one_work+0x171/0x300 worker_thread+0x2b/0x370 ? process_one_work+0x300/0x300 kthread+0x108/0x120 ? kthread_park+0x80/0x80 ret_from_fork+0x22/0x40 Modules linked in: input_leds sg led_class virtio_balloon virtio_console qemu_fw_cfg dm_mod virtio_rng ip_tables x_tables autofs4 ext4 mbcache jbd2 fscrypto sr_mod cdrom ata_generic virtio_net net_failover failover virtio_blk virtio_pci i2c_piix4 virtio_ring ata_piix virtio libata i2c_core floppy ---[ end trace 60c8d1a075894c8d ]--- RIP: 0010:native_read_pmc+0x2/0x10 Code: e2 20 89 3e 48 09 d0 c3 89 f9 89 f0 0f 30 c3 66 0f 1f 84 00 00 00 00 00 89 f0 89 f9 0f 30 31 c0 c3 0f 1f 80 00 00 00 00 89 f9 <0f> 33 48 c1 e2 20 48 09 d0 c3 0f 1f 40 00 0f 20 c0 c3 66 66 2e 0f RSP: 0018:ffff8881b9a03e50 EFLAGS: 00010083 RAX: 0000000000000001 RBX: ffff800000000001 RCX: 0000000000000000 RDX: 000000000000002f RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8881b590e400 R08: ffff8881b590e400 R09: 0000000000000003 R10: ffffe8ffffc05440 R11: 0000000000000000 R12: ffff8881b590e5d8 R13: 0000000000000010 R14: ffff8881b590e420 R15: ffffe8ffffc05400 FS: 0000000000000000(0000) GS:ffff8881b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9bcc5c61f8 CR3: 00000001b6a24000 CR4: 00000000000006f0 Kernel panic - not syncing: Fatal exception in interrupt Kernel Offset: disabled ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]--- The host seems to be running fine, the KVM guest crash is reproducible. Both host and guest are running Debian unstable with a locally built kernel; the host runs 5.1.1, the guest 5.0.13. The crash also happens when the host is running 5.1.0; going back to 5.0.13 with the host allows the guest to finish bootup and run fine. Please note that my kernel 5.1.1 image is not fully broken in KVM, I have update my APU machine which runs firewall and other infrastructure services and the guests run fine there. The machine in question is an older box with an AMD Phenom(tm) II X6 1090T Processor. I guess that the issue is related to the Phenom CPU. Any idea short of bisecting? Greetings Marc -- ----------------------------------------------------------------------------- Marc Haber | "I don't trust Computers. They | Mailadresse im Header Leimen, Germany | lose things." Winona Ryder | Fon: *49 6224 1600402 Nordisch by Nature | How to make an American Quilt | Fax: *49 6224 1600421
