>
> Hello,
> We see a wierd situation here - when we run some tests on
> an smp system, we see a total system freeze... whats'
> interesting is that we turn on magic-sysrq and kdb, but still we
> are totally locked on the keyboard - can't get to kdb or make
> the magic-sysrq work.. is there any other hacks to get into the
> system one way or the other and get some info.? network doesn't
> work either - no ping packets..
> TIA
What kernel, 2.2 or 2.4? If you can manage to generate a
non-maskable interrupt, you should be able to force control
to kdb. Some hardware platforms include an NMI button, but
most don't. One can build fairly simple hardware using the
simple ISA or PCI cards to generate an NMI, I'm not sure if anyone
sells such a product however.
Sounds like you're in a tight loop with all interrupts masked or
disabled.
scott
