Messages in this thread | | | Date | Thu, 18 Nov 2004 21:06:03 +0100 | From | Ingo Molnar <> | Subject | Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm1-V0.7.28-1 |
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* Christian Meder <chris@onestepahead.de> wrote:
> I've got one of those 'my box just locked up'. I can reproduce it with > 0.7.25-1, 0.7.28-0 and 0.7.28-1 by starting the Jetty servlet > container with our inhouse java project under a Blackdown 1.4 jdk. > Within a minute the laptop just locks up: no mouse, no ping, console > switching sysrq-t or anything. The peculiar thing is that I was > running 0.7.25-1 for two or three days before and it was rocksolid. It > was just when I started to work with the jvm that things fell apart. > > Any chance to get any interesting and helpful data in this setup ?
best would be to have a reproducer. Can you trigger it over the network, using a remote session? If yes then you might want to try this: let the box boot in, switch it to a text console and dont touch the keyboard after that. Do this over the remote session:
echo 1 > /proc/sys/kernel/debug_direct_keyboard
this activates a direct interrupt line for the keyboard only. Keep the box on the text-console, and try to reproduce the hang over the network. Once it triggers, try SysRq - does it work? (leds wont work, but normal keys should work.)
if the keyboard still doesnt work then you could try nmi_watchdog=1 or nmi_watchdog=2 (the latter on IO-APIC-less systems), and serial logging, to capture a dump of the hard-lockup.
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