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Date:	Thu, 24 Apr 2014 16:19:25 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: cygcheck -p file.exe segmentation fault (x86_64)
Message-ID:	<20140424141925.GS2339@calimero.vinschen.de>
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On Apr 23 23:25, Doug Henderson wrote:
> On Wed, Apr 23, 2014 at 9:44 AM, Corinna Vinschen wrote:
> > On Apr 23 09:17, Doug Henderson wrote:
> >> I am trying to identify the package containing the strings executable.
> >>
> >> $ uname -a
> >> CYGWIN_NT-6.1 Rover 1.7.29(0.272/5/3) 2014-04-07 13:46 x86_64 Cygwin
> >>
> >> $ cygcheck -p strings.exe
> >> Segmentation fault
> >>
> >> After installing the binutils package (which contains strings.exe) I
> >> still get the segfault. Further testing shows that "cygcheck -p
> >> regexp" segfaults for any target regexp.
> >
> > Strange.  I'm getting either
> >
> > $ cygcheck -p strings.exe
> > cygcheck: unable to contact cygwin.com site, InternetOpenUrl() failed: =
The operation timed out
> >  (win32 error 12002)
> >
> > or
> >
> > $ cygcheck -p strings.exe
> > Found 18 matches for strings.exe
> > x86_64/binutils/binutils-2.23.52-5
> ...
> > x86_64/mingw64-x86_64-binutils-debuginfo/mingw64-x86_64-binutils-debugi=
nfo-2.24.0.3.85cf705-1
> >
> >
> > Corinna
>=20
>=20
>=20
> Sometimes, the first invocation of "cygcheck -p strings.exe" after
> starting the cygwin session shows the expected output before the
> segfault. Subsequent executions only show the segfault.

I can't reproduce this, it works for me all the time.

> Attached is the output (p1.txt) from  "strace cygcheck -p
> strings.exe". On at least one occasion, I saw the expected output half
> way through the exception messages.
>=20
> I do not get a stack dump file, and I can't seem to get anything
> useful by running with gdb.

cygcheck is not a Cygwin application but a native Windows one.
It doesn't return lots of usueful info under strace becasue this
requires a Cygwin DLL, and cygcheck only loads the cygwin DLL
at runtime, but doesn't need any of Cygwin's functionality for -p.

The cygwin-debuginfo package adds symbols, this may be a big help
debugging this problem.


Corinna

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

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