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Date: Fri, 7 Sep 2001 21:24:51 -0400
From: Christopher Faylor <cgf AT redhat DOT com>
To: cygwin-developers AT cygwin DOT com
Subject: Re: I know CVS is hosed (this time for sure)
Message-ID: <20010907212451.C19703@redhat.com>
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References: <20010907173823 DOT A4187 AT redhat DOT com> <000e01c137f2$0b795980$a300a8c0 AT nhv>
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On Fri, Sep 07, 2001 at 07:08:43PM -0400, Norman Vine wrote:
>Christopher Faylor writes:
>>
>>Ok, I managed to duplicate this.  It didn't happen to me when building
>>in the winsup directory but it did in the top level.
>>
>>The problem was, as I suspected, due to the zombies allocation.  The
>>problem is that allocating the zombies array only when needed 
>>caused the
>>heap to grow while the program was in the process of forking.  So,
>>when the parent tried to copy the heap to the child during a fork, the
>>heap was larger in the parent than in the child.  Boom.
>>
>>That illustrates potential thread unsafety in fork() but I'm sure not
>>going to fix that before 1.3.3.
>>
>>AFAICT, this also had nothing to do with moving buckets to 
>>cygheap.  I'm
>>not sure how that would have affected anything unless the alignment in
>>the data segment caused by having buckets there threw off the heap just
>>enough so that it masked the fork problem.
>>
>>Corinna and Egor, can you verify if this checkin fixes things.
>
>Chris
>
>I didn't want to chime in with a 'me too' before but I had been getting 
>'spawning' errors with the CVS cygwin for the last couple of days.  
>
>The current CVS files seem to work fine !!  
>
>I can bootstrap Cygwin again  :-)

Thanks.  It's good to get independent verification.

cgf