DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:message-id:date:from:mime-version:to:subject
	:references:in-reply-to:content-type:content-transfer-encoding;
	 q=dns; s=default; b=bseExgcc5jhw5SnBPNPIq5bCvtneDbMN+A0Yy7CHURf
	dX5BzVyhbytUxWx/w3E7HHvoAzFLlz7r1uJ2c1Xl9+riSQjFrZaahUYX4bqmdgk4
	VenlL2BKgogsQ+qw6/uzGyNb9lmTsenALgtEz2Ha3DzPp3hv09LzbSOnefyYtCZk
	=
Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm
Sender: cygwin-owner@cygwin.com
Mail-Followup-To: cygwin@cygwin.com
Message-ID: <53ADAF68.2020703@cygwin.com>
Date: Fri, 27 Jun 2014 12:52:40 -0500
From: Yaakov Selkowitz <yselkowitz@cygwin.com>
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0
MIME-Version: 1.0
To: cygwin@cygwin.com
Subject: Re: Crash in g_file_monitor on 32-bit Cygwin
References: <53AB82AB.5000304@cornell.edu> <53ADA5B5.10404@cornell.edu>
In-Reply-To: <53ADA5B5.10404@cornell.edu>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

On 2014-06-27 12:11, Ken Brown wrote:
> On 6/25/2014 10:17 PM, Ken Brown wrote:
>> This is a followup to
>> https://cygwin.com/ml/cygwin/2014-06/msg00324.html, from which I
>> extracted the following test case:
>>
>> $ cat gfile-test.c
>> #include <stdio.h>
>> #include <gio/gio.h>
>>
>> void
>> gfile_add_watch (const char *file)
>> {
>>    GFile *gfile = g_file_new_for_path (file);
>>    GFileMonitor *monitor;
>>    GFileMonitorFlags gflags = G_FILE_MONITOR_NONE;
>>    monitor = g_file_monitor (gfile, gflags, NULL, NULL);
>>    if (! monitor)
>>      printf ("Can't watch file %s\n", file);
>>    else
>>      printf ("Watching file %s\n", file);
>> }
>>
>> int
>> main ()
>> {
>>    const char *file = "gfile-test.c";
>>    gfile_add_watch (file);
>> }
>>
>> $ gcc -g -O0 -o gfile-test $(pkg-config --cflags gio-2.0) gfile-test.c
>> $(pkg-config --libs gio-2.0)
>>
>> In the 64-bit case, this behaves as expected:
>>
>> $ ./gfile-test.exe
>> Watching file gfile-test.c
>>
>> In the 32-bit case, however, it crashes.  Running it under gdb shows
>> that the call to g_file_monitor leads to a SEGV, but I can't tell
>> exactly where; when I try to single step through the Glib code, I
>> eventually hit an assertion violation in gdb.  strace shows lots of
>> exceptions, but I can't make much sense out of it otherwise.
>
> I rebuilt glib and gamin without optimization so that I could step
> through the code in gdb.  But stepping through the code turned out to be
> unnecessary, because the bug was gone after the rebuilds.  I don't know
> if optimization was really the issue or whether just rebuilding with the
> latest tools is what fixed it.
>
> My builds can be obtained from
>
>    http://sanibeltranquility.com/cygwin/
>
> if anyone else wants to try to reproduce this without rebuilding the
> packages themselves.
>
> Yaakov, could you take a look?

Sure.  Are you narrow this down to only one of glib or gamin?


Yaakov


--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple