And another:
Apr  4 23:20:40 aethereal kernel: [41416.180518] kvm: 5987: cpu0 unhandled rdmsr
: 0xc0010117
Apr  4 23:20:40 aethereal kernel: [41416.180575] kvm: 5987: cpu0 unhandled wrmsr
: 0xc0010117 data 0
Apr  4 23:20:40 aethereal kernel: [41416.180649] kvm: 5987: cpu0 unhandled rdmsr
: 0xc0010117
Apr  4 23:21:08 aethereal kernel: [41443.436700] __ratelimit: 3501 callbacks suppressed
Apr  4 23:21:08 aethereal kernel: [41443.436704] kvm: 27319: cpu0 unhandled wrmsr: 0xc0010117 data 0
Apr  4 23:37:16 aethereal kernel: [42411.704410] rmap_remove: ffff880119bcb000 2d7d9a6c65342fe1 0->BUG
Apr  4 23:37:16 aethereal kernel: [42411.704478] ------------[ cut here ]------------
Apr  4 23:37:16 aethereal kernel: [42411.704483] kernel BUG at /build/buildd/linux-2.6.28/arch/x86/kvm/mmu.c:560!
Apr  4 23:37:16 aethereal kernel: [42411.704489] invalid opcode: 0000 [#1] SMP
Apr  4 23:37:16 aethereal kernel: [42411.704497] last sysfs file: /sys/devices/pci0000:00/0000:00:1c.1/0000:0c:00.0/rfkill/rfkill0/state
Apr  4 23:37:16 aethereal kernel: [42411.704503] Dumping ftrace buffer:
Apr  4 23:37:16 aethereal kernel: [42411.704509]    (ftrace buffer empty)
Apr  4 23:37:16 aethereal kernel: [42411.704512] CPU 0
Apr  4 23:37:16 aethereal kernel: [42411.704517] Modules linked in: binfmt_misci915 drm ppdev bridge stp bnep input_polldev kvm_intel kvm snd_hwdep sbp2 lp parport snd_hda_intel arc4 ecb snd_pcm_oss snd_mixer_oss snd_pcm iwlagn iwlcore snd_seq_dummy pata_pcmcia snd_seq_oss snd_seq_midi led_class snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device mac80211 psmouse pcmcia snd soundcoreserio_raw pcspkr yenta_socket rsrc_nonstatic pcmcia_core iTCO_wdt iTCO_vendor_support joydev dcdbas btusb snd_page_alloc cfg80211 sha256_generic aes_x86_64 aes_generic cbc dm_crypt fbcon tileblit font bitblit softcursor squashfs unionfs nls_iso8859_1 nls_cp437 vfat fat usbhid usb_storage ohci1394 ieee1394 tg3 video output intel_agp
Apr  4 23:37:16 aethereal kernel: [42411.704635] Pid: 27320, comm: kvm Not tainted 2.6.28-11-generic #39-Ubuntu
Apr  4 23:37:16 aethereal kernel: [42411.704640] RIP: 0010:[<ffffffffa03e1cbe>] [<ffffffffa03e1cbe>] rmap_remove+0x21e/0x230 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.704673] RSP: 0018:ffff88011e539ba8  EFLAGS: 00010296
Apr  4 23:37:16 aethereal kernel: [42411.704678] RAX: 0000000000000048 RBX: 000000d9a6c65342 RCX: 0000000000000001
Apr  4 23:37:16 aethereal kernel: [42411.704683] RDX: ffff8800a75bf000 RSI: 0000000000000086 RDI: 0000000000000296
Apr  4 23:37:16 aethereal kernel: [42411.704689] RBP: ffff88011e539bc8 R08: 0000000000000006 R09: 0000000000000000
Apr  4 23:37:16 aethereal kernel: [42411.704694] R10: ffff88011e539a56 R11: ffff88011e539a48 R12: ffff880119bcb000
Apr  4 23:37:16 aethereal kernel: [42411.704698] R13: ffff88004e15aa00 R14: ffff88011b5b8000 R15: ffff88011e539c18
Apr  4 23:37:16 aethereal kernel: [42411.704705] FS:  00007f6016d84950(0000) GS:ffffffff80aa3000(0000) knlGS:0000000000000000
Apr  4 23:37:16 aethereal kernel: [42411.704710] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
Apr  4 23:37:16 aethereal kernel: [42411.704715] CR2: 000000007c80ddf5 CR3: 000000010246b000 CR4: 00000000000026a0
Apr  4 23:37:16 aethereal kernel: [42411.704720] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Apr  4 23:37:16 aethereal kernel: [42411.704725] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Apr  4 23:37:16 aethereal kernel: [42411.704731] Process kvm (pid: 27320, threadinfo ffff88011e538000, task ffff88006d4f1660)
Apr  4 23:37:16 aethereal kernel: [42411.704735] Stack:
Apr  4 23:37:16 aethereal kernel: [42411.704738]  0000000000000000 ffff88004e15aa00 0000000000000000 ffff880119b21f60
Apr  4 23:37:16 aethereal kernel: [42411.704747]  ffff88011e539c48 ffffffffa03e4280 ffff88011e539bf8 ffffffffa03d62c1
Apr  4 23:37:16 aethereal kernel: [42411.704757]  000000000000c615 0000000000000001 ffff88011e539c18 ffffffffa03e1a4b
Apr  4 23:37:16 aethereal kernel: [42411.704768] Call Trace:
Apr  4 23:37:16 aethereal kernel: [42411.704772]  [<ffffffffa03e4280>] paging64_sync_page+0xa0/0x190 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.704798]  [<ffffffffa03d62c1>] ? gfn_to_memslot+0x11/0x60 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.704824]  [<ffffffffa03e1a4b>] ? gfn_to_rmap+0x1b/0x70 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.704849]  [<ffffffffa03e3ae0>] kvm_sync_page+0x80/0xb0 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.704873]  [<ffffffffa03e3b23>] mmu_sync_fn+0x13/0x30 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.704896]  [<ffffffffa03e15e5>] mmu_unsync_walk+0xd5/0x140 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.704920]  [<ffffffffa03e50d0>] mmu_sync_children+0x40/0x50 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.704943]  [<ffffffffa03e3b10>] ? mmu_sync_fn+0x0/0x30 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.704967]  [<ffffffffa03e5183>] mmu_sync_roots+0xa3/0xd0 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.704990]  [<ffffffffa03e6218>] kvm_mmu_load+0x58/0xa0 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.705013]  [<ffffffffa03daa60>] vcpu_enter_guest+0x2e0/0x400 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.705038]  [<ffffffffa03dcc49>] __vcpu_run+0x69/0x2d0 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.705061]  [<ffffffffa03e090a>] kvm_arch_vcpu_ioctl_run+0x8a/0x1f0 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.705086]  [<ffffffffa03d8295>] ? kvm_vm_ioctl+0xd5/0x230 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.705110]  [<ffffffffa03d5582>] kvm_vcpu_ioctl+0x2e2/0x5a0 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.705133]  [<ffffffff8069e989>] ? _spin_lock+0x9/0x10
Apr  4 23:37:16 aethereal kernel: [42411.705143]  [<ffffffff80277718>] ? futex_wake+0xf8/0x130
Apr  4 23:37:16 aethereal kernel: [42411.705153]  [<ffffffff802f62d1>] vfs_ioctl+0x31/0xa0
Apr  4 23:37:16 aethereal kernel: [42411.705038]  [<ffffffffa03dcc49>] __vcpu_run+0x69/0x2d0 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.705061]  [<ffffffffa03e090a>] kvm_arch_vcpu_ioctl_run+0x8a/0x1f0 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.705086]  [<ffffffffa03d8295>] ? kvm_vm_ioctl+0xd5/0x230 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.705110]  [<ffffffffa03d5582>] kvm_vcpu_ioctl+0x2e2/0x5a0 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.705133]  [<ffffffff8069e989>] ? _spin_lock+0x9/0x10
Apr  4 23:37:16 aethereal kernel: [42411.705143]  [<ffffffff80277718>] ? futex_wake+0xf8/0x130
Apr  4 23:37:16 aethereal kernel: [42411.705153]  [<ffffffff802f62d1>] vfs_ioctl+0x31/0xa0
Apr  4 23:37:16 aethereal kernel: [42411.705163]  [<ffffffff802f6685>] do_vfs_ioctl+0x75/0x230
Apr  4 23:37:16 aethereal kernel: [42411.705171]  [<ffffffff802f68d9>] sys_ioctl+0x99/0xa0
Apr  4 23:37:16 aethereal kernel: [42411.705178]  [<ffffffff8021253a>] system_call_fastpath+0x16/0x1b
Apr  4 23:37:16 aethereal kernel: [42411.705187] Code: 8b 14 24 4c 89 e6 48 c7 c7 b0 0a 3f a0 31 c0 e8 48 a6 2b e0 0f 0b eb fe 49 8b 14 24 4c 89 e6 48 c7 c7 900a 3f a0 e8 31 a6 2b e0 <0f> 0b eb fe 48 8b 07 49 89 00 eb 8d 66 0f 1f 44 00 0055 48 89
Apr  4 23:37:16 aethereal kernel: [42411.705268] RIP  [<ffffffffa03e1cbe>] rmap_remove+0x21e/0x230 [kvm]
Apr  4 23:37:16 aethereal kernel: [42411.705294]  RSP <ffff88011e539ba8>
Apr  4 23:37:16 aethereal kernel: [42411.705305] ---[ end trace d41f828d6c5f0a92 ]---