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Date:	Mon, 10 Nov 2014 12:14:16 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: [ANNOUNCEMENT] TEST RELEASE: Cygwin 1.7.33-0.8
Message-ID:	<20141110111416.GE2782@calimero.vinschen.de>
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On Nov  7 16:16, Tim Prince wrote:
>=20
> On 11/7/2014 4:11 AM, Corinna Vinschen wrote:
> >
> > - GCC 4.9.2-1 DLLs accidentally call __cxa_atexit with the wrong DSO
> >   handle value.  This Cygwin update allows this scenario throughout.
> >   It now understands *any* DSO handle value, as long as it's a pointer
> >   into the DSO's address space.
> >   This fixes: https://cygwin.com/ml/cygwin/2014-11/msg00122.html
> >
> >   If you don't build applications or DLLs with Cygwin, you can safely
> >   ignore this change.
> >
> >
> > If you want to help testing this new release (which I seriously hope
> > for), you can find it in your setup-x86.exe or setup-x86_64.exe as
> > "test" release.
> >
> >
> >
> I take it from now on it should be OK to take the default for=20
>=20
> __cxa_atexit
>=20
> when configuring to build gcc.  Thanks for explanation.
> I'm repeating some tests with 1.7.33-0.8 and gcc/gfortran 4.9.2-1
>=20
> no surprises, thanks (following segfault apparently unchanged, running wi=
th AV and Defender disabled, but failure not seen with gfortran 5.0):
>=20
> Program received signal SIGSEGV: Segmentation fault - invalid memory refe=
rence.
>=20
> Backtrace for this error:
> 1181925 [main] profile_omp 3684 fixup_mmaps_after_fork: ReadProcessMemory=
 failed
>  for MAP_PRIVATE address 0x6FE5FC60000, Win32 error 998

This probably means that there's an mmap'ed memory region which Cygwin
has in its bookkeeping list, but which doesn't exist in the parent
process anymore.  The problem here is that it's totally unclear how
something like this could have happened.

> 2248013 [main] profile_omp 3684 C:\users\tim\tim\tim\src\campbell\Profile=
_send_3
> Nov14\profile_omp.exe: *** fatal error in forked process - recreate_mmaps=
_after_
> fork_failed
> 3891395 [main] profile_omp 3684 cygwin_exception::open_stackdumpfile: Dum=
ping st
> ack trace to profile_omp.exe.stackdump
>       6 [main] profile_omp 1992 fork: child -1 - forked process 3684 died=
 unexpe
> ctedly, retry 0, exit code 0x100, errno 11
>   11849 [main] profile_omp 1992 cygwin_exception::open_stackdumpfile: Dum=
ping st
> ack trace to profile_omp.exe.stackdump

Does that happen under Cygwin 1.7.32 as well?  Can you create a simple
testcase, preferredly in plain C, which allows to reproduce this?


Thanks,
Corinna

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

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