Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sources.redhat.com/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sources.redhat.com/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com
Message-ID: <3E5F0B61.1040003@corpit.ru>
Date: Fri, 28 Feb 2003 10:10:25 +0300
From: Egor Duda <deo AT corpit DOT ru>
Reply-To: Egor Duda <cygwin AT cygwin DOT com>
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.1) Gecko/20020927 Debian/1.1-1
MIME-Version: 1.0
To: Ronald Landheer-Cieslak <ronald AT landheer DOT com>
Cc: "Jon A. Lambert" <jlsysinc AT alltel DOT net>, cygwin AT cygwin DOT com,
   binutils AT sources DOT redhat DOT com
Subject: Bug in dumper
References: <Pine DOT LNX DOT 4 DOT 44 DOT 0302271156500 DOT 1192-100000 AT localhost DOT localdomain>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit

Ronald Landheer-Cieslak wrote:
>>Does dumper.exe work?

Well, i should have answered this, but unfortunately, i have no access 
to windows machine right now to debug, or even verify this.

>>Upon execution I see the following in the cygwin console:
>>  $ ./div.exe
>>        7 [main] div 2296 handle_exceptions: Error while dumping state (probably corrupted stack)
>>  Arithmetic exception (core dumped)
>>
>>In the cmd.exe console window that dumper.bat starts I see the following:
>>  C:\cygwin\home\jlambert>dumper.exe -d C:/cygwin/home/jlambert/div.exe 1884
>>  dumping process #1884 to div.exe.core
>>  setting bfd architecture: No error

Well, this is a strange line. This last line of dumper's output 
indicates than call to bfd_set_arch_mach(abfd, bfd_arch_i386, 0) havs 
returned non-zero status, which should indicate an error (if i 
understand things correctly), yet bfd_perror called immediately 
afterwards has printed "No error" message.

This means that either i'm wrong about my assumptions about 
bfd_set_arch_mach() and its return, or there's a bug in binutils. It 
should be quite easy to debug, though, for those who have a cygwin 
toolchain installed. Just build dumper with debug info (this will 
require building bfd alongside), start any innocent process, say, bash, 
get its pid and then run 'dumper -d c:/cygwin/bin/bash.exe <bash_pid>' 
under gdb. This should reveal what status is returned by 
bfd_set_arch_mach, and why.

egor.


--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Bug reporting:         http://cygwin.com/bugs.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/