Lockups in 2.4.19 -- suggestions please

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Hi,

I have been getting recurrent lockups with 2.4.19. Usually when the
machine is idle and unattended. Often 10/day!!

Logs are always empty, SysRq unresponsive. Have rigged a serial
console - empty too.

Can I have some suggestions on how to get useful information for
debugging, either provoke/log an oops or get an eip?

CPU is K6, so APIC->NMI is not an option.

Have installed kdb, but cannot break in with that either.

Any suggestions?

Thanks,

Mark
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