Driver debugging help

Patrick Lamaizière patfbsd at
Fri Sep 12 11:23:36 UTC 2008

Le Thu, 11 Sep 2008 11:59:05 +0200,
"Riaan Kruger" <riaank at> a écrit :

> I am looking for hints to debug a driver I am working on. I get a
> page fault when running the driver intensively.  The stack trace from
> the kernel dump only goes up to a free command which I suspect is
> being called from my driver. No matter what I do I cannot get a more
> "complete" stack trace. kgdb says something about the stack being
> corrupt when I do a backtrace/stack trace.
> Is there anything else I could use to help me pinpoint where I am
> going wrong?
> I have tried memguard but it has given me no information. Maybe I am
> using it incorrectly.

Did you try redzone(9)? If the stack is corrupted it could be a buffer

You can ask on freebsd-hackers or freebsd-drivers mailing lists. And
may be show us the code?


More information about the freebsd-questions mailing list