I did not notice any user visible problem due to this bug. Moreover, I have several other "unable to handle kernel NULL pointer dereference" in my logs. Here is another one:
[ 3890.840048] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 3890.840053] IP: [<ffffffff8158632a>] __mutex_lock_slowpath+0xca/0x180
[ 3890.840060] PGD 0
[ 3890.840063] Oops: 0002 [#1] SMP
[ 3890.840066] last sysfs file: /sys/bus/usb/drivers/hiddev/uevent
[ 3890.840068] CPU 0
[ 3890.840070] Modules linked in: usbhid(+) hid binfmt_misc rfcomm parport_pc sco ppdev bnep l2cap vboxdrv microcode deflate zlib_deflate ctr twofish twofish_common camellia serpent blowfish cast5 des_generic cryptd aes_x86_64 aes_generic xcbc rmd160 sha512_generic sha256_generic sha1_generic crypto_null af_key nvidia(P) snd_hda_codec_analog snd_hda_intel snd_hda_codec snd_hwdep thinkpad_acpi arc4 snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq pcmcia snd_timer snd_seq_device iwlagn snd soundcore yenta_socket pcmcia_rsrc pcmcia_core snd_page_alloc tpm_tis joydev iwlcore mac80211 sbp2 ieee1394 tpm led_class cfg80211 tpm_bios nvram btusb bluetooth lp parport psmouse serio_raw firewire_ohci firewire_core crc_itu_t video output ahci libahci e1000e intel_agp
[ 3890.840116]
[ 3890.840119] Pid: 30, comm: kseriod Tainted: P 2.6.35-19-generic #28-Ubuntu 7663Y2F/7663Y2F
[ 3890.840122] RIP: 0010:[<ffffffff8158632a>] [<ffffffff8158632a>] __mutex_lock_slowpath+0xca/0x180
[ 3890.840126] RSP: 0018:ffff88007b967d90 EFLAGS: 00010246
[ 3890.840128] RAX: 0000000000000000 RBX: ffff880078b360a0 RCX: 00000000ffffffff
[ 3890.840130] RDX: ffff88007b967da0 RSI: 00000000ffffffff RDI: ffff880078b360a4
[ 3890.840132] RBP: ffff88007b967df0 R08: 0000000000000000 R09: 0000000000000000
[ 3890.840134] R10: 00000000ffffffff R11: 0000000000000001 R12: ffff88007b9544a0
[ 3890.840136] R13: ffff880078b360a4 R14: 00000000ffffffff R15: ffff880078b360a8
[ 3890.840139] FS: 0000000000000000(0000) GS:ffff880001e00000(0000) knlGS:0000000000000000
[ 3890.840141] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 3890.840143] CR2: 0000000000000000 CR3: 0000000001a2a000 CR4: 00000000000006f0
[ 3890.840145] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 3890.840147] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 3890.840150] Process kseriod (pid: 30, threadinfo ffff88007b966000, task ffff88007b9544a0)
[ 3890.840151] Stack:
[ 3890.840153] ffff88007b967fd8 ffff88007b9544a0 ffff880078b360a8 0000000000000000
[ 3890.840156] <0> ffff88007b967de0 ffffffff8138712a ffff88007b967de0 ffff880078b360a0
[ 3890.840160] <0> ffff880078b360a0 0000000000000286 ffff88007b967ea8 0000000000000000
[ 3890.840164] Call Trace:
[ 3890.840169] [<ffffffff8138712a>] ? device_attach+0x5a/0xb0
[ 3890.840172] [<ffffffff8158623b>] mutex_lock+0x2b/0x50
[ 3890.840176] [<ffffffff814295bb>] serio_reconnect_port+0x2b/0xa0
[ 3890.840179] [<ffffffff81429c7a>] serio_handle_event+0x21a/0x2d0
[ 3890.840183] [<ffffffff8107e6a7>] ? finish_wait+0x67/0x90
[ 3890.840185] [<ffffffff81429d65>] serio_thread+0x35/0xe0
[ 3890.840188] [<ffffffff8107e510>] ? autoremove_wake_function+0x0/0x40
[ 3890.840191] [<ffffffff81429d30>] ? serio_thread+0x0/0xe0
[ 3890.840194] [<ffffffff8107dfb6>] kthread+0x96/0xa0
[ 3890.840197] [<ffffffff8100aee4>] kernel_thread_helper+0x4/0x10
[ 3890.840200] [<ffffffff8107df20>] ? kthread+0x0/0xa0
[ 3890.840203] [<ffffffff8100aee0>] ? kernel_thread_helper+0x0/0x10
[ 3890.840205] Code: 90 4c 8d 6b 04 4c 8d 7b 08 41 be ff ff ff ff 4c 89 ef e8 1a 14 00 00 48 8b 43 10 48 8d 55 b0 48 89 53 10 4c 89 7d b0 48 89 45 b8 <48> 89 10 44 89 f0 4c 89 65 c0 87 03 83 f8 01 75 24 eb 2c eb 01
[ 3890.840234] RIP [<ffffffff8158632a>] __mutex_lock_slowpath+0xca/0x180
[ 3890.840237] RSP <ffff88007b967d90>
[ 3890.840239] CR2: 0000000000000000
[ 3890.840242] ---[ end trace 39bd1fd9da90aaa9 ]---
ProblemType: KernelOops
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-19-generic 2.6.35-19.28
Regression: Yes
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.35-19.28-generic 2.6.35.3
Uname: Linux 2.6.35-19-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Annotation: Your system might become unstable now and might need to be restarted.
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
Subdevices: 2/2
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: cyril 1866 F.... pulseaudio
CRDA:
country 98:
(2402 - 2482 @ 40), (N/A, 16)
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xfe220000 irq 49'
Mixer name : 'Analog Devices AD1984'
Components : 'HDA:11d41984,17aa20d7,00100400'
Controls : 32
Simple ctrls : 20
Card29.Amixer.info:
Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 7KHT24WW-1.08'
Mixer name : 'ThinkPad EC 7KHT24WW-1.08'
Components : ''
Controls : 1
Simple ctrls : 1
Card29.Amixer.values:
Simple mixer control 'Console',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [on]
Date: Sat Sep 4 08:45:07 2010
Failure: oops
Frequency: This has only happened once.
HibernationDevice: RESUME=UUID=c1f5d962-4413-4ec6-8467-16ef4ca5ad2c
MachineType: LENOVO 7663Y2F
PccardctlIdent:
Socket 0:
no product info available
PccardctlStatus:
Socket 0:
no card
ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.35-19-generic root=UUID=8077df6b-eb0e-40ff-9a4e-acbf5205d4a7 ro bootchart=svg quiet splash
RelatedPackageVersions: linux-firmware 1.38
SourcePackage: linux
Title: BUG: unable to handle kernel NULL pointer dereference at (null)
WifiSyslog:
Sep 5 09:49:58 cyril-laptop kernel: [94191.974756] npviewer.bin[32491]: segfault at f3ed7054 ip 00000000f61c2733 sp 00000000ffda71c0 error 4 in libflashplayer.so[f5e23000+b2c000]
Sep 5 09:58:34 cyril-laptop kernel: [94708.752197] npviewer.bin[10627]: segfault at 418 ip 00000000f605cdd6 sp 00000000ffdaa918 error 6 in libflashplayer.so[f5e0e000+b2c000]
Sep 5 10:37:58 cyril-laptop kernel: [97072.831916] iwlagn 0000:03:00.0: TX Power requested while scanning!
WpaSupplicantLog:
dmi.bios.date: 05/11/2009
dmi.bios.vendor: LENOVO
dmi.bios.version: 7LETC6WW (2.26 )
dmi.board.name: 7663Y2F
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr7LETC6WW(2.26):bd05/11/2009:svnLENOVO:pn7663Y2F:pvrThinkPadT61:rvnLENOVO:rn7663Y2F:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 7663Y2F
dmi.product.version: ThinkPad T61
dmi.sys.vendor: LENOVO
Cyril Jaquier, thank you for reporting this bug and helping make Ubuntu better. This bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? Can you try with the latest development release of Ubuntu? ISO CD images are available from http://
If it remains an issue, could you run the following command from a Terminal (Applications-
apport-collect -p linux <replace-
Also, if you could test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https:/
Thanks in advance.