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Subjectpage_alloc.c bug and heavy I/O
Hi,

My hardware and softare:

Asus P4P800, 2GB memory, 2.8GHZ P4 with HT enabled.
On-board 3com Giga bit network card
1 parallel ata 160G maxtor disk
Nvidia Gefore4 MX440-8x graphics card (Asus V9180)

Redhat 7.3, original kernel 2.4.18-3
Intel Fortran Compiler 7.1
Intel Math Kernel Library 6.0

My problem is that one of my fortran code always crashes after 10-24 hours.
This code has a heavy IO. It writes out a 5MB binary file every 1 minute.

The error message in /var/log/message is: (coulson is the name of the computer)

Aug 7 21:11:29 coulson kernel: kernel BUG at page_alloc.c:226!
Aug 7 21:11:29 coulson kernel: invalid operand: 0000
Aug 7 21:11:29 coulson kernel: nfsd lockd sunrpc binfmt_misc sr_mod soundcore
parport_pc lp parport autofs 3c
....

the line number with page_alloc.c varies for different crases (not always 226).

This code also had a heavy IO. Specifically, it writes out a 5MB file every
1 minute.

I have done a couple of tests to try to find the cause, but without success so
far.

1) I have rmmod the 3com2000.0 network driver. The driver source is downloaded
from asus website, and compiled by me. The crash still occurs.

2) I heard of Nvidia binary driver can cause page_alloc.c kernel bug.
I do have a Nvidia Gefore4 MX440-8x graphics card (Asus V9180), but I did
not use Nvidia binary driver. Instead I used the vesa driver coming with redhat
7.3. Nevertheless, I changed to an old pci ATI rage graphics card. But the
crash still occurs.

3) when the crash occurs, my local X is up and running. I have not tried
the case with local X shutdown.

I also got the same crash when I run the code on a second computer with the
same hw and sw. This makes the hw defect less likely to be the cause.

I am thinking to recompile a new kernel. But now I focus on if it is caused
by some uncompatible module drivers.

I would appreciate your inputs on this. Please cc your answer to me. I am not on
the list.

Xiaogang



------------------------------------------------
Dr Xiaogang Wang
Departement de chimie
Universite de Montreal
C.P. 6128, succursale Centre-ville
Montreal (Quebec) H3C 3J7

Tel. (514) 3436111 ext 3947 (office)
FAX (514) 3437586 (office)
e-mail: xiaogang.wang@umontreal.ca
homepage: http://www.esi.umontreal.ca/~wangx
------------------------------------------------


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