backtrace/2224: backtrace doesn't work with bochs stub anymore

Daniel Jacobowitz
Wed Feb 7 03:48:00 GMT 2007

The following reply was made to PR backtrace/2224; it has been noted by GNATS.

From: Daniel Jacobowitz <>
To: Godmar Back <>
Subject: Re: backtrace/2224: backtrace doesn't work with bochs stub anymore
Date: Tue, 6 Feb 2007 22:38:33 -0500

 On Tue, Feb 06, 2007 at 10:29:09PM -0500, Godmar Back wrote:
 > You mean the "invalid hex digit 78" message?
 > I'm pretty sure this is because the bochs stub, which is the stub that
 > has the issue, sends the string literal "ENN" instead of "Enn" where
 > "nn" is a hex number.  Note that 'N' is dec 78.
 Note, this is not a command error (part of the protocol) it's a
 protocol error.  GDB may just throw up its hands and stop talking to
 the target.
 If you could repeat the test in both qemu and bochs, and in both cases
 use "set debug target 1" and "set debug frame 1" before connecting, and
 run from the target command to the failing backtrace, then I'll be able
 to see what's _really_ going on in your sessions.  I think it's
 probably something totally different, e.g. in memory.
 Daniel Jacobowitz

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