Re: strace of 100% CPU usage

[Chris Faylor <cgf at cygnus dot com>]

On Thu, Oct 12, 2000 at 06:29:04AM -0700, Earnie Boyd wrote:
>I've attached two straces one using a -f switch the other without it.  I was
>expecting to get something huge with this as the strace was of the make of
>Cygwin.  What I found was that an `sh' goes looping waiting on some
>non-existant child and during this wait the CPU is 100% used with the waiting
>`sh' job getting most of the time.  The waiting `sh' job eventually times out
>after ~5 minutes.  Under strace we get:
>  ... sync_with_child: WaitForMultipleObjects timed out
>  Cannot fork: No more processes
>  Make: *** [all-apache] Error 2
>where ... is: ######### [main] sh ###
>
>Without the strace the make continues albeit abusivly and slowly.

I actually duplicated this yesterday.  I am still scratching my head over
the cause.  There was actually a bug in strace which causes the looping,
though.  If you rebuild from CVS the looping goes away and is replaced
by a SIGSEGV.

Thanks for the strace, though.

cgf