cvs commit: src/sys/alpha/alpha db_trace.c src/sys/arm/arm db_trace.c src/sys/conf files src/sys/i386/i386 db_trace.c src/sys/ia64/ia64 db_trace.c src/sys/kern subr_stack.c src/sys/powerpc/powerpc db_trace.c src/sys/sparc64/sparc64 ...

Robert Watson rwatson at
Wed Aug 3 11:30:41 GMT 2005

On Wed, 3 Aug 2005, Jeff Roberson wrote:

>  Added files:
>    sys/kern             subr_stack.c
>    sys/sys              stack.h
>  Log:
>   - Add support for saving stack traces and displaying them via printf(9)
>     and KTR.
>  Contributed by:         Antoine Brodin <antoine.brodin at>
>  Concept code from:      Neal Fachan <neal at>

This sounds really great.  I have a local /usr/src/sys/kern/kern_utrace.c 
for back-tracing user application stacks that I find quite useful -- I 
wonder if we could extend this to also work with user thread stacks?  It 
can be quite handy for determining how an application reached a 
particularly obscure kernel state.  It doesn't do the ELF magic, but does 
reach into VM to determine what object+offset backs each page pointed to 
by a return address.


Robert N M Watson

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