FreeBSD7.1/i386 crash (fatal trap 12)

Mikolaj Golub at
Tue Mar 17 00:29:59 PDT 2009

On Tue, 17 Mar 2009 06:35:04 +0300 anborn at wrote:

> What can I do with it? I don`t have experience in using gdb or programming on C.

I suppose your kernel is built with "makeoptions DEBUG=-g".

Then enable kernel crash dump:

echo 'dumpdev="AUTO"' >> /etc/rc.conf
/etc/rc.d/dumpon start

After panic, get the baktrace from the dump using instructions from this page:

Or just run crashinfo and extract bt from generated core.txt.

Post bt here or to freebsd-hackers.

Mikolaj Golub

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