[sf-lug] Pointers for how to track down source of system hang

[Blake Haggerty]

Cant fix  your problem... (My suggestion would have been disable Compiz but looks like you did that)  But I am curious as to what this means "Raising Elephants Is So Utterly Boring" ?

 

 







Blake Haggerty
Permanent Placement Specialist 







Work: 415-788-8488 x6062
Fax: 415-788-2592

Email: blake.haggerty at sapphire.com
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-----Original Message-----
From:Mark K. Zanfardino mark at zanfardinoconsulting.com 
To: "Linux userGroup" ;
Sent: Jan 31, 2008 11:34:39 AM
Subject: [sf-lug] Pointers for how to track down source of system hang

I'm looking for pointers on how I can go about discovering what is 
causing my system to hang periodically. Let me first define hang in 
these terms: the GUI freezes and is unresponsive to either a reload via 
ctrl-alt-backspace now does the system respond to the magic sysrq keys. 
I typically attempt the "Raising Elephants Is So Utterly Boring" 
sequence without any results. I inevitably have to resort to a hard-boot. 

Let me start by laying out the system: 
Distro: 
Kubuntu Gutsy Gibon 
uname -a: 
Linux mycroft-lx 2.6.22-14-generic #1 SMP Tue Dec 18 08:02:57 UTC 2007 
i686 GNU/Linux 
lspci: 
00:00.0 Host bridge: ATI Technologies Inc RS480 Host Bridge (rev 10) 
00:02.0 PCI bridge: ATI Technologies Inc RS480 PCI-X Root Port 
00:07.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge 
00:12.0 SATA controller: ATI Technologies Inc SB600 Non-Raid-5 SATA 
00:13.0 USB Controller: ATI Technologies Inc SB600 USB (OHCI0) 
00:13.1 USB Controller: ATI Technologies Inc SB600 USB (OHCI1) 
00:13.2 USB Controller: ATI Technologies Inc SB600 USB (OHCI2) 
00:13.3 USB Controller: ATI Technologies Inc SB600 USB (OHCI3) 
00:13.4 USB Controller: ATI Technologies Inc SB600 USB (OHCI4) 
00:13.5 USB Controller: ATI Technologies Inc SB600 USB Controller (EHCI) 
00:14.0 SMBus: ATI Technologies Inc SBx00 SMBus Controller (rev 13) 
00:14.1 IDE interface: ATI Technologies Inc SB600 IDE 
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia 
00:14.3 ISA bridge: ATI Technologies Inc SB600 PCI to LPC Bridge 
00:14.4 PCI bridge: ATI Technologies Inc SBx00 PCI to PCI Bridge 
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] 
HyperTransport Technology Configuration 
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] 
Address Map 
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] 
DRAM Controller 
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] 
Miscellaneous Control 
02:00.0 VGA compatible controller: nVidia Corporation G70 [GeForce 7600 
GS] (rev a1) 
3f:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5755 
Gigabit Ethernet PCI Express (rev 02) 

NOTE: As you can see from the hardware, it's running on an ATI chipset 
with the exception of the video card which is a e-GeForce 7600 GS via 
the PCI-E bus and the NIC which is integrated. 

Desktop: 
I use KDE (as it's kubuntu) with Compiz. 

- What I've checked already and what I've tested - 
I've looked at the following files after each hang: 
/var/log/syslog and syslog.0 
/var/log/message and message.0 
/var/log/kern.log and kern.log.0 
/var/log/dmesg and dmesg.0 

I've tried to identify any anomaly (as far as I can ascertain) in these 
files around the time of the hang. The only thing I've ever found that 
stands out is a reference to my audio driver (snd-hda-intel). In an 
attempt to resolve whether or not it the audio driver causing the 
problem I've removed the file snd-hda-intel.ko from 
/lib/modules/2.6.22-14-generic/ubuntu/media/snd-hda-intel (I've kept a 
copy) and rebooted. 

I've also disabled Compiz (which is actually the first thing I did) and 
run it without Compiz. 

Bottom line: even with the sound driver removed and Compiz turned off 
the system still periodically hangs. 

I'm not sure where else I ought to be looking and would like some 
suggestions for where I might turn next. 

Cheers! 

Mark 


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