[Techtalk] BUG: soft lockup detected on CPU#0!

Sat Apr 7 20:23:05 UTC 2007

On Sat, 2007-04-07 at 16:59 +0200, Doc Nielsen wrote:
> On 4/7/07, David Sumbler <david at aeolia.co.uk> wrote:
> > A friend of mine bought a Lenovo N100 laptop computer about 4 months
> > ago.  This has twin processors, and came with Ubuntu 6.06 and Windows XP
> > installed on it.  She uses Linux now, loves it, and regrets having paid
> > extra to have XP installed.  It is certainly a lovely machine.
> 
> > Unfortunately, occasionally it goes into mega-go-slow mode.  When this
> > happened yesterday I logged into her machine and, after looking at "top"
> > etc. I found the following at the end of the 'dmesg' output.
> [snip]
> 
> Looks like swapper is swapping where it either shouldn't or couldn't.
> It also points to a IRQ which might be shared.
> Perhaps a device or driver is acting out of place,
> causing trouble where swapper was working.
> 
> Did you compile the kernel or did you download it?

The kernel is downloaded - a standard Ubuntu kernel.

> Please provide more info about the system,
> like /proc/version, /proc/cpuinfo, lspci, free
> and a dump of dmesg before and after the BUG occurs.
> Remember to http://pastebin.com the info and link it to us.

Unfortunately pastebin is not working correctly at the moment.

However, the output of the above commands is:

root at agamemnon:~# cat /proc/version
Linux version 2.6.15-28-686 (buildd at terranova) (gcc version 4.0.3
(Ubuntu 4.0.3-1ubuntu5)) #1 SMP PREEMPT Thu Feb 1 16:14:07 UTC 2007
root at agamemnon:~# cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 14
model name      : Genuine Intel(R) CPU           T2300  @ 1.66GHz
stepping        : 8
cpu MHz         : 1662.536
cache size      : 2048 KB
physical id     : 0
siblings        : 1
core id         : 255
cpu cores       : 1
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx pni
monitor est tm2 xtpr
bogomips        : 3373.57

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 14
model name      : Genuine Intel(R) CPU           T2300  @ 1.66GHz
stepping        : 8
cpu MHz         : 1662.536
cache size      : 2048 KB
physical id     : 1
siblings        : 1
core id         : 255
cpu cores       : 1
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx pni
monitor est tm2 xtpr
bogomips        : 3373.57

root at agamemnon:~# lspci
0000:00:00.0 Host bridge: Intel Corporation Mobile Memory Controller Hub
(rev 03)
0000:00:01.0 PCI bridge: Intel Corporation Mobile PCI Express Graphics
Port (rev 03)
0000:00:1b.0 0403: Intel Corporation 82801G (ICH7 Family) High
Definition Audio Controller (rev 02)
0000:00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI
Express Port 1 (rev 02)
0000:00:1c.1 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI
Express Port 2 (rev 02)
0000:00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB
UHCI #1 (rev 02)
0000:00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB
UHCI #2 (rev 02)
0000:00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB
UHCI #3 (rev 02)
0000:00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB
UHCI #4 (rev 02)
0000:00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2
EHCI Controller (rev 02)
0000:00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev
e2)
0000:00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC
Interface Bridge (rev 02)
0000:00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7 Family)
Serial ATA Storage Controllers cc=IDE (rev 02)
0000:00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus
Controller (rev 02)
0000:01:00.0 VGA compatible controller: nVidia Corporation: Unknown
device 01d7 (rev a1)
0000:03:00.0 Network controller: Intel Corporation: Unknown device 4227
(rev 02)
0000:05:01.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL-8139/8139C/8139C+ (rev 10)
0000:05:04.0 CardBus bridge: ENE Technology Inc CB1410 Cardbus
Controller (rev 01)
0000:05:06.0 FireWire (IEEE 1394): Ricoh Co Ltd: Unknown device 0832
0000:05:06.1 0805: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter
(rev 19)
0000:05:06.2 System peripheral: Ricoh Co Ltd: Unknown device 0843 (rev
01)
0000:05:06.3 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus
Host Adapter (rev 0a)
0000:05:06.4 System peripheral: Ricoh Co Ltd xD-Picture Card Controller
(rev 05)
root at agamemnon:~# free
             total       used       free     shared    buffers
cached
Mem:        514000     509644       4356          0      84768
198956
-/+ buffers/cache:     225920     288080
Swap:      3903752      12688    3891064
root at agamemnon:~#

This is all current, of course - i.e. when the machine is running
normally.  There did not appear to be anything amiss with free memory
etc. when the machine was running slowly though.

Unfortunately I cannot provide dmesg information for the period before
the fault appeared, since the output of dmesg I got at that time begins
with reports of the bug.  I have looked at /var/log/kern.log
and /var/log/kern.log.0 and they don't help: for some reason that I
don't understand kern.log starts after the fault commenced
(corresponding to dmesg) and kern.log.0 ends several hours beforehand.

Would the output of 'lshw' be of use?  It is rather long to paste into
an email.  Perhaps pastebin will be working later.

Thanks for your help.

David

-- 
David Sumbler <david at aeolia.co.uk>