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SubjectRe: [2.6.4] Bad swap file entry, then kernel BUG at mm/shmem.c:475
On Fri, Apr 02, 2004 at 08:38:09AM +0300, Denis Vlasenko wrote:
> On Friday 02 April 2004 02:27, Chris Shoemaker wrote:
> > and I haven't found evidence of off-by-bit errors. However, 2 days
> > running memtest86 with all tests, gave no errors. (BTW, does anyone
> > have a suggestion of a more rigorous general hardware stress-test for
> > detecting flakiness?) If my hardware is bad it's pretty intermittent
> cpuburn.

Thanks for the tip. I ran burnBX, burnP5, and burnMMX overnight. No
problems at all. But at least I'll know about cpuburn next time I want
to test a CPU.

> Also try to slightly underclock your hardware,
> downgrade DMA mode, etc (although it seems you use SCSI...).

Actually, the SCSI drives aren't active. root and swap are on a 13GB
Fujitsu IDE drive. That got me thinking though... it seems maybe there
is a common thread to my oopses. I think they tend to happen during
disk i/o. Either I'm loading a program, or closing X or even during
boot-up ( 3 times oopsed during boot now. ) -- all i/o activities.

My disk is using udma2 mode, according to 'hdparm -I'. I guess it's
getting set that way from the BIOS, which is set to Auto for the PIO/DMA
mode. I'll follow your suggestion and try to force it lower in the
BIOS, but first I checked more carefully over the CONFIG options related
to IDE and found some things that maybe shouldn't have been set:


As far as I can tell, I don't really need any of those. So, I
disabled all of the above. I'm running with this new config for a few
hours now. If it oopses, I'll try the lower dma mode.


> vda
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