Comment 3 for bug 361819

"unable to handle kernel NULL pointer dereference"

That doesn't sound very healthy.

May 3 08:02:41 aethereal kernel: [237003.338883] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
May 3 08:02:41 aethereal kernel: [237003.338891] IP: [<ffffffffa03e2872>] gfn_to_rmap+0x22/0x70 [kvm]
May 3 08:02:41 aethereal kernel: [237003.338910] PGD 38a4d067 PUD a19b067 PMD 0

May 3 08:02:41 aethereal kernel: [237003.338914] Oops: 0000 [#1] SMP
May 3 08:02:41 aethereal kernel: [237003.338917] last sysfs file: /sys/devices/
pci0000:00/0000:00:1c.1/0000:0c:00.0/rfkill/rfkill0/state
May 3 08:02:41 aethereal kernel: [237003.338921] Dumping ftrace buffer:
May 3 08:02:41 aethereal kernel: [237003.338923] (ftrace buffer empty)
May 3 08:02:41 aethereal kernel: [237003.338925] CPU 1
May 3 08:02:41 aethereal kernel: [237003.338927] Modules linked in: ppp_async c
rc_ccitt binfmt_misc i915 drm ppdev bridge stp bnep input_polldev kvm_intel kvm
snd_hwdep sbp2 lp parport snd_hda_intel snd_pcm_oss snd_mixer_oss snd_pcm snd_se
q_dummy arc4 snd_seq_oss ecb snd_seq_midi pata_pcmcia snd_rawmidi iwlagn snd_seq
_midi_event iwlcore snd_seq snd_timer snd_seq_device led_class mac80211 snd pcmc
ia soundcore dcdbas psmouse yenta_socket rsrc_nonstatic pcmcia_core iTCO_wdt iTC
O_vendor_support pcspkr snd_page_alloc cfg80211 serio_raw btusb joydev sha256_ge
neric 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 i
eee1394 tg3 video output intel_agp
May 3 08:02:41 aethereal kernel: [237003.338974] Pid: 5624, comm: kvm Tainted:
G W 2.6.28-11-generic #42-Ubuntu
May 3 08:02:41 aethereal kernel: [237003.338976] RIP: 0010:[<ffffffffa03e2872>]
  [<ffffffffa03e2872>] gfn_to_rmap+0x22/0x70 [kvm]
May 3 08:02:41 aethereal kernel: [237003.338986] RSP: 0018:ffff8800ab5e79f8 EF
LAGS: 00010202
May 3 08:02:41 aethereal kernel: [237003.338988] RAX: 0000000000000000 RBX: 000
0000000000080 RCX: 0000000000000000
May 3 08:02:41 aethereal kernel: [237003.338990] RDX: 00000000000fee01 RSI: 000
0000000000022 RDI: fffffffffffff001
May 3 08:02:41 aethereal kernel: [237003.338991] RBP: ffff8800ab5e7a08 R08: 000
0000000000022 R09: 0000000000000000
May 3 08:02:41 aethereal kernel: [237003.338993] R10: ffff8800ab5e7ab8 R11: 0000000000000000 R12: fffffffffffff001
May 3 08:02:41 aethereal kernel: [237003.338995] R13: ffff8800ae47e160 R14: ffff88003f854000 R15: ffff8800ab5e7a88
May 3 08:02:41 aethereal kernel: [237003.338997] FS: 00007ffee209e950(0000) GS:ffff88011f803a80(0000) knlGS:0000000000000000
May 3 08:02:41 aethereal kernel: [237003.338999] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
May 3 08:02:41 aethereal kernel: [237003.339001] CR2: 0000000000000000 CR3: 000000000cd94000 CR4: 00000000000026a0
May 3 08:02:41 aethereal kernel: [237003.339003] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
May 3 08:02:41 aethereal kernel: [237003.339005] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
May 3 08:02:41 aethereal kernel: [237003.339007] Process kvm (pid: 5624, threadinfo ffff8800ab5e6000, task ffff880013e08000)
May 3 08:02:41 aethereal kernel: [237003.339009] Stack:
May 3 08:02:41 aethereal kernel: [237003.339010] 000000e4a907bd0d ffff88011c38b000 ffff8800ab5e7a38 ffffffffa03e2965
May 3 08:02:41 aethereal kernel: [237003.339013] 0000000000000000 ffff8800ae47e160 fffffffffffff001 ffff88011bcf8000
May 3 08:02:41 aethereal kernel: [237003.339017] ffff8800ab5e7ab8 ffffffffa03e56f2 ffff8800ab5e7a68 ffffffffa03d7661
May 3 08:02:41 aethereal kernel: [237003.339021] Call Trace:
May 3 08:02:41 aethereal kernel: [237003.339022] [<ffffffffa03e2965>] rmap_remove+0xa5/0x230 [kvm]
May 3 08:02:41 aethereal kernel: [237003.339032] [<ffffffffa03e56f2>] paging64_sync_page+0xa2/0x1a0 [kvm]
May 3 08:02:41 aethereal kernel: [237003.339041] [<ffffffffa03d7661>] ? gfn_to_memslot+0x11/0x60 [kvm]
May 3 08:02:41 aethereal kernel: [237003.339051] [<ffffffffa03e286b>] ? gfn_to_rmap+0x1b/0x70 [kvm]
May 3 08:02:41 aethereal kernel: [237003.339065] [<ffffffffa03e4da5>] kvm_sync_page+0xb5/0x100 [kvm]
May 3 08:02:41 aethereal kernel: [237003.339073] [<ffffffffa03e5e89>] mmu_sync_children+0x239/0x340 [kvm]
May 3 08:02:41 aethereal kernel: [237003.339082] [<ffffffffa03e6055>] mmu_sync_roots+0xc5/0xd0 [kvm]
May 3 08:02:41 aethereal kernel: [237003.339090] [<ffffffffa03e8125>] kvm_mmu_load+0x135/0x220 [kvm]
May 3 08:02:41 aethereal kernel: [237003.339098] [<ffffffffa03e141d>] kvm_arch_vcpu_ioctl_run+0x6cd/0xbd0 [kvm]
May 3 08:02:41 aethereal kernel: [237003.339106] [<ffffffff8024933d>] ? check_preempt_wakeup+0x21d/0x230
May 3 08:02:41 aethereal kernel: [237003.339111] [<ffffffff8024a3cc>] ? try_to_wake_up+0x12c/0x2e0
May 3 08:02:41 aethereal kernel: [237003.339114] [<ffffffff802404fe>] ? __wake_up+0x4e/0x70
May 3 08:02:41 aethereal kernel: [237003.339118] [<ffffffffa03d66a2>] kvm_vcpu_ioctl+0x2e2/0x5a0 [kvm]
May 3 08:02:41 aethereal kernel: [237003.339126] [<ffffffff802106c5>] ? __switch_to+0x2a5/0x490
May 3 08:02:41 aethereal kernel: [237003.339130] [<ffffffff802f62d1>] vfs_ioctl+0x31/0xa0
May 3 08:02:41 aethereal kernel: [237003.339134] [<ffffffff8069c55c>] ? thread_return+0x37/0x36b
May 3 08:02:41 aethereal kernel: [237003.339138] [<ffffffff802f6685>] do_vfs_ioctl+0x75/0x230
May 3 08:02:41 aethereal kernel: [237003.339141] [<ffffffff802f68d9>] sys_ioctl+0x99/0xa0
May 3 08:02:41 aethereal kernel: [237003.339143] [<ffffffff8069efd9>] ? do_device_not_available+0x9/0x10
May 3 08:02:41 aethereal kernel: [237003.339146] [<ffffffff8021253a>] system_call_fastpath+0x16/0x1b
May 3 08:02:41 aethereal kernel: [237003.339149] Code: 41 5e 41 5f c9 c3 0f 1f00 55 48 89 e5 48 83 ec 10 48 89 1c 24 89 d3 4c 89 64 24 08 49 89 f4 e8 e5 4d ff ff 85 db 48 89 c1 74 2e <48> 8b 00 4c 89 e2 48 c1 ea 09 48 c1 e8 09 48 29 c2 48 c1 e2 04
May 3 08:02:41 aethereal kernel: [237003.339175] RIP [<ffffffffa03e2872>] gfn_to_rmap+0x22/0x70 [kvm]
May 3 08:02:41 aethereal kernel: [237003.339184] RSP <ffff8800ab5e79f8>
May 3 08:02:41 aethereal kernel: [237003.339185] CR2: 0000000000000000
May 3 08:02:41 aethereal kernel: [237003.339187] ---[ end trace b1baed433d4364d4 ]---