Subject : kernel BUG at arch/x86/kvm/../../../virt/kvm/kvm_main.c:1978 Submitter : Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Date : 2010-08-19 9:54 Message-ID : 20100819095429.GA5201@swordfish.minsk.epam.com References : http://marc.info/?l=linux-kernel&m=128221169606214&w=2 This entry is being used for tracking a regression from 2.6.35. Please don't close it until the problem is fixed in the mainline.
Handled-By : Avi Kivity <avi@redhat.com>
Reported to be still present in 2.6.36-rc3 with backtrace: http://lkml.org/lkml/2010/8/30/80
On Monday, August 30, 2010, Sergey Senozhatsky wrote: > On (08/30/10 00:36), Rafael J. Wysocki wrote: > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=16961 > > Subject : kernel BUG at > arch/x86/kvm/../../../virt/kvm/kvm_main.c:1978 > > Submitter : Sergey Senozhatsky <sergey.senozhatsky@gmail.com> > > Date : 2010-08-19 9:54 (11 days old) > > Message-ID : <20100819095429.GA5201@swordfish.minsk.epam.com> > > References : http://marc.info/?l=linux-kernel&m=128221169606214&w=2 > > Handled-By : Avi Kivity <avi@redhat.com> > > > > Hello, > .36-rc3 > > [ 2913.218767] kvm: disabling virtualization on CPU1 > [ 2913.219078] CPU 1 is now offline > [ 2913.221758] lockdep: fixing up alternatives. > [ 2913.221814] Booting Node 0 Processor 1 APIC 0x1 > [ 2913.363980] ------------[ cut here ]------------ > [ 2913.364042] kernel BUG at arch/x86/kvm/../../../virt/kvm/kvm_main.c:1978!
[ 313.487258] kvm: enabling virtualization on CPU3 [ 313.487326] NMI watchdog enabled, takes one hw-pmu counter. [ 313.489627] coretemp coretemp.3: TjMax is 105 C. [ 315.344223] lockdep: fixing up alternatives. [ 315.344236] Booting Node 0 Processor 2 APIC 0x4 [ 315.487292] ------------[ cut here ]------------ [ 315.487322] kernel BUG at arch/x86/kvm/../../../virt/kvm/kvm_main.c:1978! [ 315.487352] invalid opcode: 0000 [#1] PREEMPT SMP [ 315.487388] last sysfs file: /sys/devices/system/cpu/cpu2/online [ 315.487415] CPU 2 [ 315.487425] Modules linked in: kvm_intel kvm ipv6 snd_seq_dummy ac battery \ snd_seq_oss snd_seq_midi_event snd_hwdep snd_seq snd_seq_device wmi usbhid hid \ snd_hda_codec_atihdmi radeon button snd_hda_codec_realtek snd_pcm_oss snd_mixer_oss \ snd_hda_intel snd_hda_codec snd_pcm snd_timer snd soundcore snd_page_alloc broadcom \ tg3 libphy psmouse serio_raw evdev ttm drm_kms_helper ehci_hcd sr_mod usbcore cdrom \ sd_mod ahci libahci [ 315.487728] [ 315.487739] Pid: 27687, comm: qemu-kvm Not tainted \ 2.6.36-rc1-dbg-git2-00264-gd5a1964-dirty #134 Aspire 5741G /Aspire 5741G [ \ 315.487787] RIP: 0010:[<ffffffffa02f2446>] [<ffffffffa02f2446>] \ kvm_handle_fault_on_reboot+0xf/0x11 [kvm] [ 315.487839] RSP: 0000:ffff88013c333b18 \ EFLAGS: 00010246 [ 315.487863] RAX: ffff88013c333b40 RBX: ffff88012dcb0000 RCX: \ ffff88010c7e9000 [ 315.487893] RDX: ffff880002280000 RSI: ffff8801563e8728 RDI: \ ffff88010c7e9000 [ 315.487922] RBP: ffff88013c333b18 R08: ffff880002213cd0 R09: \ 00000000000003c7 [ 315.487952] R10: 0000000000000000 R11: 0000000000000001 R12: \ 0000000000000002 [ 315.487982] R13: ffff88010c7e9000 R14: ffff8801563e8000 R15: \ 0000000000000000 [ 315.488012] FS: 00007f15014be710(0000) GS:ffff880002280000(0000) \ knlGS:0000000000000000 [ 315.488046] CS: 0010 DS: 002b ES: 002b CR0: \ 000000008005003b [ 315.488070] CR2: 0000000000000000 CR3: 0000000154b42000 CR4: \ 00000000000006e0 [ 315.488100] DR0: 0000000000000000 DR1: 0000000000000000 DR2: \ 0000000000000000 [ 315.488130] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: \ 0000000000000400 [ 315.488160] Process qemu-kvm (pid: 27687, threadinfo \ ffff88013c332000, task ffff8801563e8000) [ 315.488194] Stack: [ 315.488205] ffff88013c333b68 ffffffffa026d0a2 ffff88013c333b58 ffffffff81062e91 [ 315.488244] <0> ffff8801563e8000 000000010c7e9000 ffff880157d78000 \ ffff88012dcb0000 [ 315.488290] <0> 0000000000000002 0000000000014240 \ ffff88013c333b98 ffffffffa02fb4cc [ 315.488337] Call Trace: [ 315.488353] [<ffffffffa026d0a2>] vmx_vcpu_load+0x90/0x1a0 [kvm_intel] [ 315.488384] [<ffffffff81062e91>] ? mark_held_locks+0x50/0x72 [ 315.488415] [<ffffffffa02fb4cc>] kvm_arch_vcpu_load+0x73/0xbb [kvm] [ 315.488446] [<ffffffffa02f2cd8>] kvm_sched_in+0xd/0xf [kvm] [ 315.488474] [<ffffffff8102de1f>] finish_task_switch+0x90/0xd7 [ 315.488500] [<ffffffff8102dd8f>] ? finish_task_switch+0x0/0xd7 [ 315.488529] [<ffffffff81373381>] schedule+0x81d/0x8f2 [ 315.488553] [<ffffffff81062e91>] ? mark_held_locks+0x50/0x72 [ 315.488584] [<ffffffffa030d82c>] ? kvm_cpu_has_interrupt+0x3a/0x56 [kvm] [ 315.488617] [<ffffffffa02f5057>] kvm_vcpu_block+0x8e/0xa9 [kvm] [ 315.488645] [<ffffffff81052dbd>] ? autoremove_wake_function+0x0/0x34 [ 315.488678] [<ffffffffa030024d>] kvm_arch_vcpu_ioctl_run+0x97d/0xca0 [kvm] [ 315.488712] [<ffffffffa030016a>] ? kvm_arch_vcpu_ioctl_run+0x89a/0xca0 [kvm] [ 315.488743] [<ffffffff813747d1>] ? mutex_lock_nested+0x2f3/0x31b [ 315.488771] [<ffffffff8103441b>] ? sub_preempt_count+0x92/0xa5 [ 315.488800] [<ffffffffa02f4164>] kvm_vcpu_ioctl+0x113/0x4e9 [kvm] [ 315.488829] [<ffffffff81376247>] ? _raw_spin_unlock_irq+0x3c/0x59 [ 315.488859] [<ffffffff810e8d5b>] do_vfs_ioctl+0x4c1/0x502 [ 315.488885] [<ffffffff810dc496>] ? fget_light+0xe0/0xf8 [ 315.488909] [<ffffffff810dc408>] ? fget_light+0x52/0xf8 [ 315.490162] [<ffffffff810e8ded>] sys_ioctl+0x51/0x74 [ 315.491403] [<ffffffff81002002>] system_call_fastpath+0x16/0x1b [ 315.492649] Code: 2f 02 00 85 c0 75 13 ba 01 00 00 00 31 f6 48 c7 c7 bb 27 2f a0 \ e8 6a db d4 e0 c9 c3 55 80 3d 59 2f 02 00 00 48 89 e5 74 02 eb fe <0f> 0b 55 48 89 e5 \ 53 48 89 f3 48 83 ec 08 48 8b 87 90 00 00 00 [ 315.495975] RIP \ [<ffffffffa02f2446>] kvm_handle_fault_on_reboot+0xf/0x11 [kvm] [ 315.498317] RSP \ <ffff88013c333b18> [ 315.510526] ---[ end trace ac38cfaaa84a0bdf ]--- [ 315.510763] kvm: enabling virtualization on CPU2 Looks like a race between the scheduler and the kvm cpu online notifier.
On Monday, September 13, 2010, Sergey Senozhatsky wrote: > On (09/12/10 20:14), Rafael J. Wysocki wrote: > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=16961 > > Subject : kernel BUG at > arch/x86/kvm/../../../virt/kvm/kvm_main.c:1978 > > Submitter : Sergey Senozhatsky <sergey.senozhatsky@gmail.com> > > Date : 2010-08-19 9:54 (25 days old) > > Message-ID : <<20100819095429.GA5201@swordfish.minsk.epam.com>> > > References : http://marc.info/?l=linux-kernel&m=128221169606214&w=2 > > Handled-By : Avi Kivity <avi@redhat.com> > > > > > > Hello, > Fixed by > commit da908f2fb4e783c2a4de751fb90f11a0dd041161 > Author: Zachary Amsden <zamsden@redhat.com>