I was trying to reproduce bug #121173. When I closed the new tab, I saw
this in syslog:

***
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000] BUG: unable to handle 
kernel NULL pointer dereference at virtual address 00000000
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000]  printing eip:
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000] 00000000
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000] *pde = 00000000
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000] Oops: 0000 [#1]
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000] SMP 
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000] Modules linked in: battery 
ac thermal fan button ipw3945 ieee80211 b44 mii i915 drm acpi_cpufreq 
cpufreq_powersave cpufreq_ondemand cpufreq_userspace cpufreq_conservative 
cpufreq_stats freq_table container asus_acpi dock video sbs ipv6 nls_utf8 ntfs 
arc4 ecb blkcipher sbp2 ieee80211_crypt_wep parport_pc lp parport fuse joydev 
snd_hda_intel snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss 
snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device 
ieee80211_crypt snd sdhci pcspkr serio_raw psmouse mmc_core intel_agp soundcore 
shpchp pci_hotplug agpgart af_packet iTCO_wdt iTCO_vendor_support 
snd_page_alloc evdev ext3 jbd mbcache sg sr_mod cdrom sd_mod ata_piix ohci1394 
ieee1394 ehci_hcd ata_generic libata scsi_mod uhci_hcd usbcore processor 
capability commoncap
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000] CPU:    1
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000] EIP:    0060:[<00000000>]  
  Not tainted VLI
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000] EFLAGS: 00210282   
(2.6.22-6-generic #1)
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000] EIP is at 0x0
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000] eax: eca30540   ebx: 
c0307320   ecx: 00005410   edx: ecac8600
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000] esi: ecac8600   edi: 
bfcd1694   ebp: 00005410   esp: e21c1f68
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000] ds: 007b   es: 007b   fs: 
00d8  gs: 0033  ss: 0068
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000] Process bash (pid: 7954, 
ti=e21c0000 task=f783cf60 task.ti=e21c0000)
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000] Stack: c018cdc8 bfcd1694 
00000000 ecac8600 000000ff e21c0000 c018ce3c e21c0000 
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000]        c01fdf90 00000000 
ecac8600 bfcd1694 e21c0000 c018d0e2 bfcd1694 00000000 
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000]        000000ff bfcd169c 
00001f12 c01041d2 000000ff 00005410 bfcd1694 bfcd169c 
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000] Call Trace:
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000]  [do_ioctl+120/144] 
do_ioctl+0x78/0x90
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000]  [vfs_ioctl+92/656] 
vfs_ioctl+0x5c/0x290
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000]  [copy_to_user+48/96] 
copy_to_user+0x30/0x60
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000]  [sys_ioctl+114/144] 
sys_ioctl+0x72/0x90
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000]  
[sysenter_past_esp+107/169] sysenter_past_esp+0x6b/0xa9
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000]  =======================
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000] Code:  Bad EIP value.
Jun 20 02:22:06 snifer-laptop kernel: [ 8555.428000] EIP: [<00000000>] 0x0 
SS:ESP 0068:e21c1f68
***

[EMAIL PROTECTED]:~$ uname -a
Linux snifer-laptop 2.6.22-6-generic #1 SMP Fri Jun 1 19:24:12 GMT 2007 i686 
GNU/Linux

** Attachment added: "dmesg.log"
   http://launchpadlibrarian.net/8140094/dmesg.log

-- 
unable to handle kernel NULL pointer dereference at virtual address
https://bugs.launchpad.net/bugs/109030
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