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Subjecthow to determine the cause of kernel lock ups

I am having a problem on and off with my machine.

It is a NEC Ready 8951 (the output of dmesg is appended).

It seems that after prolonged periods of heavy use (8+ hours of
interactive use) the machine will frequently lock-up. I'm pretty sure
that this is a heat-related problem, but I'm not sure how to proceed
from here to narrow it down.

When I take the panel off of the mini-tower, none of the internals
seem hot to the touch. My CPU already has a fan on it that dumps the
heat inside of the case. The power supply also has a fan to draw the
cooler outside air in (I keep it about 74 degrees in my house).

I tried looking through the kernel messages that klogd puts in
syslog, but when the machine locks up, nothing is logged. Rebooting
is enough to start the system working again, although heavy use will
cause it to lock up again.

Any thoughts?

Jon 'tex' Boone

--------------- dmesg output ---------------

Linux version 2.2.5-22 ( (gcc version
egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)) #8 Thu Jul 8
05:56:57 EDT 1999
Detected 224534651 Hz processor.
Console: colour VGA+ 80x25
Calibrating delay loop... 223.64 BogoMIPS
Memory: 123964k/126976k available (860k kernel code, 412k
reserved, 1688k data, 52k init)
Checking if this processor honours the WP bit even in supervisor
mode... Ok.
VFS: Diskquotas version dquot_6.4.0 initialized
CPU: Cyrix M II 3x Core/Bus Clock stepping 08
Checking 386/387 coupling... OK, FPU using exception 16 error
Checking 'hlt' instruction... OK.
POSIX conformance testing by UNIFIX
PCI: PCI BIOS revision 2.10 entry at 0xfb220
PCI: Using configuration type 1
PCI: Probing PCI hardware
Linux NET4.0 for Linux 2.2
Based upon Swansea University Computer Society NET3.039
NET4: Unix domain sockets 1.0 for Linux NET4.0.
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
Linux IP multicast router 0.06 plus PIM-SM
Initializing RT netlink socket
Starting kswapd v 1.5
Detected PS/2 Mouse Port.
Serial driver version 4.27 with MANY_PORTS MULTIPORT SHARE_IRQ
ttyS01 at 0x02f8 (irq = 3) is a 16550A
pty: 2048 Unix98 ptys configured
apm: BIOS version 1.2 Flags 0x07 (Driver version 1.9)
Real Time Clock Driver v1.09
SIS5513: IDE controller on PCI bus 00 dev 09
SIS5513: not 100% native mode: will probe irqs later
ide0: BM-DMA at 0x4000-0x4007, BIOS settings: hda:pio,
ide1: BM-DMA at 0x4008-0x400f, BIOS settings: hdc:pio,
hda: Maxtor 90680D4, ATA DISK drive
hdb: Maxtor 90432D2, ATA DISK drive
hdc: CRD-8320B, ATAPI CDROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: Maxtor 90680D4, 6485MB w/256kB Cache, CHS=826/255/63
hdb: Maxtor 90432D2, 4121MB w/256kB Cache, CHS=525/255/63
hdc: ATAPI 32X CD-ROM drive, 128kB Cache
Uniform CDROM driver Revision: 2.54
Floppy drive(s): fd0 is 1.44M
FDC 0 is a post-1991 82077
Partition check:
hda: hda1 hda2 < hda5 hda6 hda7 hda8 hda9 hda10 hda11 >
hdb: hdb1 hdb2 < hdb5 >
VFS: Mounted root (ext2 filesystem) readonly.
Freeing unused kernel memory: 52k freed
Adding Swap: 72256k swap-space (priority -1)
Soundblaster audio driver Copyright (C) by Hannu Savolainen
SB 3.01 detected OK (220)
YM3812 and OPL-3 driver Copyright (C) by Hannu Savolainen, Rob
Hooft 1993-1996
eth0: OEM i82557/i82558 10/100 Ethernet at 0xe400,
00:20:35:E7:90:03, IRQ 10.
Board assembly 672923-003, Physical connectors present: RJ45
Primary interface chip i82555 PHY #1.
General self-test: passed.
Serial sub-system self-test: passed.
Internal registers self-test: passed.
ROM checksum self-test: passed (0x49caa8d6).
Receiver lock-up workaround activated.
3c59x.c:v0.99H 11/17/98 Donald Becker
eth1: 3Com 3Com Boomerang (unknown version) at 0xe000,
00:10:4b:17:cc:64, IRQ 11
8K byte-wide RAM 5:3 Rx:Tx split, autoselect/Autonegotiate
MII transceiver found at address 24, status 182d.
Enabling bus-master transmits and whole-frame receives.
arpwatch uses obsolete (PF_INET,SOCK_PACKET)
device eth0 entered promiscuous mode
Installing knfsd (copyright (C) 1996
nfsd_init: initialized fhcache, entries=256

--------------- dmesg output ---------------

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