possible mmap() problems

Matt matt@use.net
Wed Apr 16 20:19:00 GMT 2003

On Wed, 16 Apr 2003, Joe Buehler wrote:

> Christopher Faylor wrote:
> > If it's predictable where the page is, then I wonder if you could set a
> > hardware watchpoint to catch when it is happening?  Or maybe even strace
> > would tell you.
> It's a hard one.  I have a build that fails randomly.  On one run,
> out of 51 errors (handle_exceptions) caught by strace, 49 of them
> happened right after a pipe close.  I believe that they all did happen
> at the same address.  Adding strace printfs for Virtual* calls caused
> the problem to (apparently) go away (sigh).
> I assume I can't use hardware watchpoints because there are lots and lots
> of processes coming and going while the build is going on, and no apparent
> rhyme or reason to the problem.

Sounds like a job for Softice or windbg.. windbg can be gotten for free @
www.microsoft.com/ddk . I'm more familiar with Softice, but I've seen
othre people use windbg to set a hardware breakpoint on a memory location.


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