Comment 16 for bug 85500

I'm also getting similar oops, about one a month.

Feisty, Linux version 2.6.20-16-generic (root@terranova) (gcc version 4.1.2 (Ubuntu 4.1.2-0ubuntu4)) #2 SMP Thu Jun 7 20:19:32 UTC 2007

I've run memtest86 with everything turned on, but failed to find any hardware memory problems.

Example oops:

Jun 16 10:06:29 paston01 kernel: [131511.196000] BUG: unable to handle kernel NULL pointer dereference at virtual address 00000044
Jun 16 10:06:29 paston01 kernel: [131511.196000] printing eip:
Jun 16 10:06:29 paston01 kernel: [131511.196000] c02ee810
Jun 16 10:06:29 paston01 kernel: [131511.196000] *pde = 00000000
Jun 16 10:06:29 paston01 kernel: [131511.196000] Oops: 0002 [#1]
Jun 16 10:06:29 paston01 kernel: [131511.196000] SMP
Jun 16 10:06:29 paston01 kernel: [131511.196000] Modules linked in: battery ac thermal fan button tg3 ipw3945 ieee80211 ieee80211_crypt snd_rtctimer nls_iso8859_1 nls_cp437 vfat fat option ppp_deflate bsd_comp ppp_async ppp_generic slhc usbserial sr_mod cdrom usb_storage libusual ohci_hcd ipt_LOG xt_limit xt_tcpudp nf_conntrack_ipv4 xt_state nf_conntrack nfnetlink iptable_filter ip_tables x_tables binfmt_misc nlvcard mishim(P) ppdev rfcomm l2cap ipv6 af_packet acpi_cpufreq cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_ondemand freq_table cpufreq_conservative tc1100_wmi pcc_acpi dev_acpi sony_acpi video sbs i2c_ec dock container asus_acpi backlight deflate zlib_deflate twofish twofish_common serpent blowfish des cbc ecb blkcipher aes xcbc sha256 sha1 crypto_null af_key fuse parport_pc lp parport snd_hda_intel snd_hda_codec snd_pcm_oss snd_pcm snd_mixer_oss snd_seq_dummy snd_seq_oss joydev snd_seq_midi snd_rawmidi snd_seq_midi_event nvidia(P) hci_usb snd_seq snd_timer snd_seq_device irda bluetooth pcmci
Jun 16 10:06:29 paston01 kernel: i2c_core crc_ccitt iTCO_wdt iTCO_vendor_support snd soundcore psmouse serio_raw intel_agp yenta_socket rsrc_nonstatic pcmcia_core snd_page_alloc agpgart shpchp pci_hotplug evdev tsdev ext3 jbd mbcache sg sd_mod ata_piix ata_generic libata scsi_mod generic ehci_hcd uhci_hcd usbcore processor fbcon tileblit font bitblit softcursor vesafb capability commoncap
Jun 16 10:06:29 paston01 kernel: [131511.196000] CPU: 0
Jun 16 10:06:29 paston01 kernel: [131511.196000] EIP: 0060:[_spin_lock+0/16] Tainted: P VLI
Jun 16 10:06:29 paston01 kernel: [131511.196000] EFLAGS: 00010202 (2.6.20-16-generic #2)
Jun 16 10:06:29 paston01 kernel: [131511.196000] EIP is at _spin_lock+0x0/0x10
Jun 16 10:06:29 paston01 kernel: [131511.196000] eax: 00000044 ebx: c003fcc0 ecx: c03ab7b4 edx: 00000001
Jun 16 10:06:29 paston01 kernel: [131511.196000] esi: c003fdac edi: 00000000 ebp: c2b51ef0 esp: c2b51ec4
Jun 16 10:06:29 paston01 kernel: [131511.196000] ds: 007b es: 007b ss: 0068
Jun 16 10:06:29 paston01 kernel: [131511.196000] Process kswapd0 (pid: 211, ti=c2b50000 task=c2b11a90 task.ti=c2b50000)
Jun 16 10:06:29 paston01 kernel: [131511.196000] Stack: c0198dc4 c15745c0 c01ecc1d e774942c e774942c 00000080 c003fcc0 00000019
Jun 16 10:06:29 paston01 kernel: [131511.196000] c018a7ad 00000000 00000019 c003fb48 e882b688 00016cd8 00000082 dfffea80
Jun 16 10:06:29 paston01 kernel: [131511.196000] 000000d0 c016053d 00005700 00000000 00000000 00000058 00000000 c0429e80
Jun 16 10:06:29 paston01 kernel: [131511.196000] Call Trace:
Jun 16 10:06:29 paston01 kernel: [131511.196000] [remove_inode_buffers+52/208] remove_inode_buffers+0x34/0xd0
Jun 16 10:06:29 paston01 kernel: [131511.196000] [_atomic_dec_and_lock+61/112] _atomic_dec_and_lock+0x3d/0x70
Jun 16 10:06:29 paston01 kernel: [131511.196000] [shrink_icache_memory+429/592] shrink_icache_memory+0x1ad/0x250
Jun 16 10:06:29 paston01 kernel: [131511.196000] [shrink_slab+285/384] shrink_slab+0x11d/0x180
Jun 16 10:06:29 paston01 kernel: [131511.196000] [kswapd+838/1072] kswapd+0x346/0x430
Jun 16 10:06:29 paston01 kernel: [131511.196000] [autoremove_wake_function+0/80] autoremove_wake_function+0x0/0x50
Jun 16 10:06:29 paston01 kernel: [131511.196000] [kswapd+0/1072] kswapd+0x0/0x430
Jun 16 10:06:29 paston01 kernel: [131511.196000] [kthread+186/240] kthread+0xba/0xf0
Jun 16 10:06:29 paston01 kernel: [131511.196000] [kthread+0/240] kthread+0x0/0xf0
Jun 16 10:06:29 paston01 kernel: [131511.196000] [kernel_thread_helper+7/16] kernel_thread_helper+0x7/0x10
Jun 16 10:06:29 paston01 kernel: [131511.196000] =======================
Jun 16 10:06:29 paston01 kernel: [131511.196000] Code: 00 00 00 01 0f 94 c0 84 c0 b9 01 00 00 00 75 09 f0 81 02 00 00 00 01 30 c9 89 c8 c3 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 90 <f0> fe 08 79 09 f3 90 80 38 00 7e f9 eb f2 c3 90 f0 81 28 00 00
Jun 16 10:06:29 paston01 kernel: [131511.196000] EIP: [_spin_lock+0/16] _spin_lock+0x0/0x10 SS:ESP 0068:c2b51ec4