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Date:	Thu, 2 Jul 2015 14:20:47 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: [ANNOUNCEMENT] TEST RELEASE: Cygwin 2.1.0-0.1
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On Jul  2 14:13, Corinna Vinschen wrote:
> On Jul  1 22:10, Ken Brown wrote:
> > I may have spoken too soon.  As I repeat the experiment on a different
> > computer, with a build from a slightly different snapshot of the emacs
> > trunk, emacs crashes when I type 'C-x d' with the following stack dump:
> >=20
> > Stack trace:
> > Frame        Function    Args
> > 00100A3E240  00180071CC3 (00000829630, 000008296D0, 00000000000, 000008=
2CE00)
> > 00030000002  001800732BE (00000000000, 00000000002, 00100A48C80, 000000=
00002)
> > 00000000000  00000006B40 (00000000002, 00100A48C80, 00000000002, 00100A=
48768)
> > 00000000000  21000000003 (00000000002, 00100A48C80, 00000000002, 00100A=
48768)
> > End of stack trace
> >=20
> > $ addr2line 00180071CC3 -e /usr/lib/debug/usr/bin/cygwin1.dbg
> > /usr/src/debug/cygwin-2.1.0-0.3/winsup/cygwin/exception.h:175
> >=20
> > $ addr2line 001800732BE -e /usr/lib/debug/usr/bin/cygwin1.dbg
> > /usr/src/debug/cygwin-2.1.0-0.3/winsup/cygwin/exceptions.cc:1639
>=20
> That points to a crash while setting up the alternate stack.  This is
> always a possibility because, in contrast to the kernel signal handler
> in a real POSIX system, the Cygwin exception handler is still running on
> the stack which triggered the crash up to the point where we call the
> signal handler function.  Dependent on how the stack overflow occured,
> this additional stack usage may be enough to kill the process for good.
>=20
> Out of curiosity, can you add this to the init_sigsegv() function:
>=20
>   #include <windows.h>
>   [...]
>   init_sigsegv (void)
>   {
>     [...]
>     SetThreadStackGuarantee (65536);

Of course this only works "per thread", so if init_sigsegv is called
for the main thread, only the main thread gets this treatment.  For
testing this should be enough, though.


Corinna

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

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