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SubjectRe: SMP freeze in <= 2.2.17 when toggling consoles
> Recently while trying to pin down SCSI errors with a Dual PII machine with
> onboard SCSI I discovered a nasty and easily repeatable way to cause a
> total system freeze.
> Tyan Thunder 100 M/B
> 256MB ram
> 2x PII-233 (klamath core)
> Onboard dual channel AIC-7895 (aic7xxx driver built into the kernel)
> Onboard eepro100 compatible ethernet.
> 2x Seagate ST34501W, 4GB, 10,000rpm drives

Ok, our system is
Epox KP6-BS, (Also a dual 440BX)
256MB ram
2x PIII-750MHz Coppermine
Adaptec AHA-294X Ultra SCSI host adapter (Ultra Wide)
2x Kingston K110TX (Lite on tulip) nics
1x 20MB/s raid unit.

> The symptom is basically this - under heavy disk activity, rapidly
> switching virtual consoles will trigger a system freeze. Nothing will
> revive the machine, the Magic Sysreq key is also inoperable. Generally I
> can get it to freeze within a couple of seconds. If I just switch consoles
> slowly it doesnt seem to freeze, but holding down ALT and tapping
> F1-F2-F1-F2 as quick as possible will freeze it in a few seconds. Quite
> often it will even freeze right in the middle of redrawing the new console
> - The top half of the screen will show part of the console you were
> switching to, while the bottom is still showing the previous console
> because it froze before it finished drawing the screen.

I've tried this a few times, but was unable to get the system to crash.
I tried varying block-sizes and against both the ata-controller and the raid-box.

You might want to try to reproduce your problems with another scsi-
controller, cable and disk comination, and also against an ide disk.

Good luck.

Simen Thoresen, Beowulf-cleaner and random artist.

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