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Bug in dumper
- From: Egor Duda <deo at corpit dot ru>
- 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
- Date: Fri, 28 Feb 2003 10:10:25 +0300
- Subject: Bug in dumper
- References: <Pine.LNX.firstname.lastname@example.org>
- Reply-to: Egor Duda <cygwin at cygwin dot com>
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:
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.
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