Stack traces

[Dave Cecil]

I have a thread that appears to be hanging in my kernel module (or 
something called by it) and I want to determine where the problem is 
occurring.  Unfortunately, printks change the timing of the system, and the 
problem no longer occurs.

What I really want is to get a stack trace of the offending thread.  I have 
used alt-sysrq-t to get some thread information, but it only provides the 
thread's saved PC (which isn't in my module, according to its address).  Is 
there a way to get the thread's call stack?  Are there any routines I could 
use or is there some documentation/code I could look at?

How do others go about solving such problems?  The only debugger I've found 
for 2.2.12 kernels that would fit the bill is SGI's kgdb, and there's 
obviously a bit of overhead involved in setting up the serial debugger.

Any thoughts or ideas much appreciated.

Oh, if this is not the appropriate place to ask, please let me know.

Cheers,
Dave