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Date: Tue, 15 Jul 2014 11:02:59 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Core dump on 32-bit Cygwin if program calls dlopen
Message-ID: <20140715090259.GB20640@calimero.vinschen.de>
Reply-To: cygwin AT cygwin DOT com
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References: <53C46ACD DOT 5060601 AT cornell DOT edu>
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On Jul 14 19:42, Ken Brown wrote:
> I'm getting a core dump on exit from a program that does nothing but call
> dlopen.  (But the call to dlopen succeeds.)  This happens only in the 32-=
bit
> case.  Here's a simple test case.
>=20
> $ cat test_dlopen.c
> #include <stdio.h>
> #include <dlfcn.h>
> int
> main()
> {
>   const char *dllname =3D "cyggs-9.dll";
>   void *handle;
>   printf ("Trying to dlopen %s...", dllname);
>   handle =3D dlopen (dllname, RTLD_LAZY);
>   if (handle)
>     {
>       printf ("succeeded.\n");
>       return 0;
>     }
>   else
>     {
>       printf ("failed.\n");
>       return 1;
>     }
> }
>=20
> $ gcc test_dlopen.c
>=20
> $ ./a
> Trying to dlopen cyggs-9.dll...succeeded.
> Aborted (core dumped)

The crash occurs when calling the destructors from do_global_dtors.
The crash address points to a crash inside a destructor of libgcc
(actually cyggcc_1-1.dll) which has been pulled in by cyggs-9.dll.

What destructor in libgcc would that be?  And what is it expecting
which is apparently missing?


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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