system hangup - I'm lost

John Baldwin jhb at
Tue Sep 30 14:53:40 UTC 2008

On Monday 29 September 2008 04:14:08 pm Oliver Lehmann wrote:
> Hi,
> My fileserver has sporadical hangups running 6.3:
> FreeBSD 6.3-STABLE #0: Thu Jun 19 00:21:00 CEST 2008
olivleh1 at
> The exact release doesn't matter since it happened before. It always
> happens afer some time of having some load on the system (I'm building
> ports with tinderbox and during the build process it just hangs up).
> The system does nothing write out on the console, neither the CRT, nor
> the serial console.

1) Setup support for crashdumps.
2) Add 'DDB' and 'KDB' to your kernel.  When it hangs, break into the debugger 
(CTRL+ALT+ESC) and run 'panic' to generate a crash dump.
3) ps -axl -M /var/crash/vmcore.X -N /boot/kernel/kernel

(where vmcore.X is the core file generated, probably vmcore.0).  That's the 
first place to start.

John Baldwin

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