possible mmap() problems

Christopher Faylor cgf@redhat.com
Thu Apr 17 00:05:00 GMT 2003

On Wed, Apr 16, 2003 at 05:32:05PM -0400, Christopher Faylor wrote:
>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.


More information about the Cygwin-developers mailing list