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Bug in dumper

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.


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