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From: "Novaelec" <info AT novaelec DOT es>
To: <cygwin AT cygwin DOT com>
Subject: RE: Postmaster core dumps
Date: Thu, 4 Aug 2005 18:14:52 +0200
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In-Reply-To: <20050804131030.GR14783@calimero.vinschen.de>

Hi!

Well, I'm a newbie in many senses and I can't help you to solve the problem
arrived at this point :'(

Who made the last version of "cygwin"?

Bye!

On Aug  3 17:39, Corinna Vinschen wrote:
>On Aug  3 17:39, Corinna Vinschen wrote:
>> On Aug  3 17:17, Novaelec wrote:
>> > Hello Corinna,
>> > 
>> > I think the problem is in cygserver because the bug is related to
>semaphores
>> > when I use gdb. [...]
>> 
>> Sorry to say that, but to me it looks like a bug in postmaster.  Looking
>> into the stacktrace printed when the SEGV occurs, I'm getting this:
>> 
>> $ addr2line -e /bin/cygwin1.dll 610D6127 610028FE 610173A9 61017A6E
>61017D1F 6109E76C 610942FF
>> /home/corinna/src/cygwin/vanilla/newlib/libc/machine/i386/memset.S:45
>> /home/corinna/src/cygwin/vanilla/winsup/cygwin/cygheap.cc:331
>> /home/corinna/src/cygwin/vanilla/winsup/cygwin/dtable.cc:375
>> /home/corinna/src/cygwin/vanilla/winsup/cygwin/dtable.cc:486
>> /home/corinna/src/cygwin/vanilla/winsup/cygwin/dtable.cc:532
>> /home/corinna/src/cygwin/vanilla/winsup/cygwin/syscalls.cc:127
>> 
>> This is the stacktrace of a dup() call on the tty slave descriptor.  It
>> looks like a heap corruption to me.  It has certainly nothing to do with
>> semaphores.
>
>FYI, I tracked the problem down to a point that I can savely say,
>it's neither a bug in postgresql, nor in cygserver.  It has nothing
>to do with semaphores.  As noted above, it's a heap problem, but
>it's entirely inside Cygwin.  Unfortunately I have no fix so far.
>For the curious, it's reproducible with
>
>	int fd;
>	for (;;)
>	  fd = dup (0);
>
>
>Corinna


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