This is the mail archive of the
cygwin
mailing list for the Cygwin project.
Re: gdb attach to process to produce stacktrace
- From: Christopher Faylor <cgf-no-personal-reply-please at cygwin dot com>
- To: cygwin at cygwin dot com
- Date: Wed, 20 Sep 2006 10:48:36 -0400
- Subject: Re: gdb attach to process to produce stacktrace
- References: <eeri1a$1qb$1@sea.gmane.org>
- Reply-to: cygwin at cygwin dot com
On Wed, Sep 20, 2006 at 07:06:45AM -0700, Hans Horn wrote:
>for quite some time I was trying to figure out (e.g.
>http://thread.gmane.org/gmane.os.cygwin/58420/focus=58420) how to attach gdb
>to a process in order to produce a useful stacktrace.
>
>All attempts however produced something useless like the following:
>
>[Switching to thread 1096.0x7f4]
>* 4 thread 1096.0x7f4 0x7c901231 in ntdll!DbgUiConnectToDbg () from
>/cygdrive/c/WINDOWS/system32/ntdll.dll
> 3 thread 1096.0xce0 0x7c90eb94 in ntdll!LdrAccessResource () from
>/cygdrive/c/WINDOWS/system32/ntdll.dll
> 2 thread 1096.0x8ec 0x7c90eb94 in ntdll!LdrAccessResource () from
>/cygdrive/c/WINDOWS/system32/ntdll.dll
> 1 thread 1096.0xc40 0x7c90eb94 in ntdll!LdrAccessResource () from
>/cygdrive/c/WINDOWS/system32/ntdll.dll
>[Switching to thread 1 (thread 1096.0xc40)]#0 0x7c90eb94 in
>ntdll!LdrAccessResource () from /cygdrive/c/WINDOWS/system32/ntdll.dll
>#6 0x00000000 in ?? ()
>#0 0x7c90eb94 in ntdll!LdrAccessResource () from
>/cygdrive/c/WINDOWS/system32/ntdll.dll
>#1 0x7c90e9ab in ntdll!ZwWaitForMultipleObjects () from
>/cygdrive/c/WINDOWS/system32/ntdll.dll
>#2 0x7c8094e2 in KERNEL32!CreateFileMappingA () from
>/cygdrive/c/WINDOWS/system32/kernel32.dll
>#3 0x00000002 in ?? ()
>#4 0x0021fe38 in ?? ()
>#5 0x00000001 in ?? ()
>#6 0x00000000 in ?? ()
Try "info threads" and you may see that thread 1 is what you're interested
in. Windows creates a new thread in the attached process when gdb attaches
to it so this is not what you would normally be interested in.
Note that if the process is stopped in a Windows DLL the stack trace
will probably not be very informative.
cgf
--
Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
Problem reports: http://cygwin.com/problems.html
Documentation: http://cygwin.com/docs.html
FAQ: http://cygwin.com/faq/