BUG: unable to handle kernel NULL pointer dereference at virtual address 0000013c

[Marco]

During a test of Gutsy Beta Desktop CD, the windows decoration disappear (title of windows and buttons). I need to restart the decoration with metacity --replace or compiz --replace from shell.

This is an extract of dmesg:
[ 2712.276000] BUG: unable to handle kernel NULL pointer dereference at virtual address 0000013c
[ 2712.276000] printing eip:
[ 2712.276000] c0195183
[ 2712.276000] *pde = 00000000
[ 2712.276000] Oops: 0000 [#1]
[ 2712.276000] SMP
[ 2712.276000] Modules linked in: michael_mic arc4 ecb blkcipher ieee80211_crypt_tkip af_packet ipv6 i915 drm rfcomm l2cap bluetooth ppdev parport_pc lp parport acpi_cpufreq cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_ondemand freq_table cpufreq_conservative video sbs container button dock battery ac snd_hda_intel snd_pcm_oss snd_mixer_oss snd_pcm joydev snd_seq_dummy snd_seq_oss ipw3945 snd_seq_midi snd_rawmidi ieee80211 snd_seq_midi_event sdhci ieee80211_crypt mmc_core psmouse serio_raw snd_seq iTCO_wdt iTCO_vendor_support shpchp pci_hotplug intel_agp agpgart snd_timer snd_seq_device snd soundcore snd_page_alloc evdev squashfs sd_mod loop unionfs nls_cp437 isofs sg sr_mod cdrom usbhid hid ata_piix ohci1394 ieee1394 e100 mii ahci ehci_hcd ata_generic libata scsi_mod uhci_hcd usbcore thermal processor fan fuse apparmor commoncap
[ 2712.276000] CPU: 1
[ 2712.276000] EIP: 0060:[<c0195183>] Not tainted VLI
[ 2712.276000] EFLAGS: 00210292 (2.6.22-12-generic #1)
[ 2712.276000] EIP is at touch_atime+0x13/0x120
[ 2712.276000] eax: df0ecb00 ebx: 00000000 ecx: df0ecb00 edx: ddfcef68
[ 2712.276000] esi: d251f4b0 edi: 00000004 ebp: d251f500 esp: c2bffdf4
[ 2712.276000] ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068
[ 2712.276000] Process gtk-window-deco (pid: 8592, ti=c2bfe000 task=d20f2f90 task.ti=c2bfe000)
[ 2712.276000] Stack: 00000001 d251f4b0 00000004 e01b2bf5 db79c860 c0eab258 d251f480 d251f4f8
[ 2712.276000] d251f508 d251f500 c10eafa1 00000000 00000000 c10eafa0 c0d953c0 00000000
[ 2712.276000] c10eafa0 00000000 00000003 d251f554 c01654c3 000000d0 c2bffea8 d251f558
[ 2712.276000] Call Trace:
[ 2712.276000] [<e01b2bf5>] unionfs_readpage+0x235/0x3e0 [unionfs]
[ 2712.276000] [<c01654c3>] __do_page_cache_readahead+0x1b3/0x250
[ 2712.276000] [<c01610e5>] filemap_nopage+0x155/0x340
[ 2712.276000] [<c016cd18>] __handle_mm_fault+0x148/0xb00
[ 2712.280000] [<c02f6266>] do_page_fault+0x126/0x690
[ 2712.280000] [<c0140336>] do_gettimeofday+0x36/0x100
[ 2712.280000] [<c02f6140>] do_page_fault+0x0/0x690
[ 2712.280000] [<c02f49c2>] error_code+0x72/0x80
[ 2712.280000] [<c02f0000>] unlink_clip_vcc+0xc0/0x120
[ 2712.280000] =======================
[ 2712.280000] Code: 4a 04 75 d6 85 f6 66 90 75 d6 eb a1 8d b6 00 00 00 00 8d bf 00 00 00 00 83 ec 0c 89 c1 89 1c 24 89 74 24 04 89 7c 24 08 8b 5a 0c <f6> 83 3c 01 00 00 02 0f 85 92 00 00 00 8b bb 98 00 00 00 8b 47
[ 2712.280000] EIP: [<c0195183>] touch_atime+0x13/0x120 SS:ESP 0068:c2bffdf4

[exactt (giesbert)]

i have a similar problem with the nightly from 09-Oct .

BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000

Yet I get it during boot up and Gutsy won't start. Neither the CD nor an updated version of Gutsy start up....

[Leann Ogasawara (leannogasawara)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. Now that the 7.10 Gutsy Gibbon release of Ubuntu is out (kernel 2.6.22-14), we were wondering if you can still reproduce this issue. Could you please download and try the new version of Ubuntu from http://www.ubuntu.com/getubuntu/download and report back your results. If the issue is still present in the new release, please attach the following information:

* uname -a > uname-a.log
* cat /proc/version_signature > version.log
* dmesg > dmesg.log
* sudo lspci -vvnn > lspci-vvnn.log

Please be sure to attach each file as a separate attachment. For more information regarding the kernel team bug policy, please refer to https://wiki.ubuntu.com/KernelTeamBugPolicies . Thanks again and we appreciate your help and feedback.

[Marco (mfj)]

I've tried 7.10 Final Release in Live Mode. No more bugs detected.
Thank You