Package: gdb
Version: 7.0.1-2+b1
Severity: normal
Tags: patch
* Preface
gdb/mi is a line based machine oriented text interface to gdb. Used
primarily by programs wishing to use gdb as a backend for a debugger GUI
or an IDE. Notable example is the Qt Creator.
Frontend may specify a preference for asynchronous execution by setting
target-async on, before either running the executable or attaching to
the target.
Now I can say that it's broken, but finding out that gdb is the culprit,
whether it was fixed already in newer versions and when exactly took me
all day. Squeeze is frozen, so I was determined to find a solution,
believing it will be applied.
* The problem exists in gdb versions up to 7.1 or more precisely:
commit ed72348da877003a79bfa638c04afed888ce045e
Author: Vladimir Prus <vladi...@codesourcery.com>
Date: Sat Nov 28 17:00:53 2009 +0000
* target.c (target_terminal_inferior): Use target_can_async_p, not
target_is_async_p.
which fixes it.
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/target.c.diff?r1=1.233&r2=1.234&cvsroot=src
* What happens if mentioned patch is not applied?
Asynchronous commands are not invoked if the target is running. It's
especially important in the case of interrupting the execution of the
target using "-exec-interrupt", which should always work.
But it's not in gdb 7.0.1.
* How I can see it myself?
Almost real-world example:
$ qemu -hda /path/to/linux-0.2.img -s # [1]
# wait at least until kernel is loaded
$ gdb # we'll mimic some Qt Creator actions here
# normally we would provide target image,
# but it's not important to show the problem
set target-async on
target remote :1234
# vm is interrupted now, try writing something in its win
-exec-continue
# vm is running now, your input shows
-exec-interrupt
# nothing happens, writing in vm still works, but it
# SHOULD NOT // apply patch to fix it
You can even recompile qemu with uncommented DEBUG_GDB define in
gdbstub.c to see that appropriate packet is not sent with
-exec-interrupt.
[1] http://wiki.qemu.org/download/linux-0.2.img.bz2
-- System Information:
Debian Release: 6.0
APT prefers testing
APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.32-5-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages gdb depends on:
ii gdbserver 7.0.1-2+b1 The GNU Debugger (remote server)
ii libc6 2.11.2-7 Embedded GNU C Library: Shared lib
ii libexpat1 2.0.1-7 XML parsing C library - runtime li
ii libncurses5 5.7+20100313-5 shared libraries for terminal hand
ii libpython2.6 2.6.6-8+b1 Shared Python runtime library (ver
ii libreadline6 6.1-3 GNU readline and history libraries
ii zlib1g 1:1.2.3.4.dfsg-3 compression library - runtime
gdb recommends no packages.
Versions of packages gdb suggests:
pn gdb-doc <none> (no description available)
-- debconf-show failed
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