possible mmap() problems

Christopher Faylor cgf@redhat.com
Wed Apr 16 21:31:00 GMT 2003

On Wed, Apr 16, 2003 at 01:19:40PM -0700, Matt wrote:
>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.

I've used softice, too.  Niced product.


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