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.
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