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Date: Tue, 16 Nov 2010 16:41:41 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Problem with fork() in latest snapshot
Message-ID: <20101116154141.GA32170@calimero.vinschen.de>
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On Nov 10 13:43, Heath Kehoe wrote:
> I have ruby 1.9.2 which I built from source. It works fine in cygwin
> 1.7.7 and earlier, but in the current snapshot when it does a fork,
> the child process dies pretty much instantly.
> 
> I've put together a test case (see attached) which replicates what
> ruby is doing so that this problem can be repro'd without needing to
> build ruby. It seems that the failure only happens when the fork
> call is in a dll, and it also seems to depend on manipulating
> threads in close proximity to the fork.
> 
> Here's the test program under 1.7.7:
> 
>    $ uname -a
>    CYGWIN_NT-6.1-WOW64 hkehoe1 1.7.7(0.230/5/3) 2010-08-31 09:58 i686
>    Cygwin
>    $ ./testfork
>    Before fork
>    After fork pid=5060
>    After fork pid=0
>    subprocess status 0 (0x0)
> 
> And here it is in the snapshot:
> 
>    $ uname -a
>    CYGWIN_NT-6.1-WOW64 hkehoe1 1.7.8s(0.233/5/3) 20101102 14:03:08 i686
>    Cygwin
>    $ ./testfork
>    Before fork
>    After fork pid=3808
>    subprocess status 32512 (0x7f00)
> 
> 
> Note the missing 'After fork' message from the child and the -127
> exit status.
> 
> An strace of testfork will reveal this error occurring shortly after
> the fork returns in the child:
> --- Process 2944, exception C0000005 at 610E4B8C
> (the process ID is the child's)

Would you mind to test which snapshot introduced this problem?


Thanks,
Corinna


-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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