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DDD / GDB interaction hangs


From: Klaus Kusche
Subject: DDD / GDB interaction hangs
Date: Sun, 29 Sep 2002 14:49:13 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.0) Gecko/20020830

Problem:
1.) Any ddd command which requires interaction with gdb hangs ad infinitum and consumes 100 % CPU, mostly in kernel mode.

The trace shows that DDD has sent the set prompt command to GDB and is waiting for a response:

GNU DDD 3.3.1 (i686-pc-linux-gnu)
Copyright (C) 1995-1999 Technische Universit<E4>t Braunschweig, Germany.
Copyright (C) 1999-2001 Universit<E4>t Passau, Germany.

Compiled with GCC 3.1.1, GNU libc 2.2
Requires X11R6, Xt11R6, Motif 2.2.2 (Motif Version 2.2.2)
Includes XPM 3.4.11, Athena Panner, DDD core
Built 2002-09-28 by root <address@hidden>.
$  ddd
+  /bin/sh -c 'exec gdb -q -fullname'
#  Hello, world!
#  Starting GDB...
#  Running GDB (pid 14197, tty /dev/pts/5)...
#  Current language: C/C++
#  Searching "vsllib/ddd.vsl"...
#  Trying "/home/kk/.ddd/vsllib/ddd.vsl"
#  Trying "/usr/share/ddd-3.3.1/vsllib/ddd.vsl"
#  Searching "vsllib/ddd.vsl"..."/usr/share/ddd-3.3.1/vsllib/ddd.vsl".
<- "(gdb) "
-> "set prompt (gdb) \n"
#  Open Program: waiting until GDB gets ready...

An strace shows that ddd is calling select within a tight loop, and select immediately returns that no data is available.

ps and lsof show that the gdb process is alive and connected to the pseudo term.

Calling gdb manually and typing "set prompt (gdb)" works.

2.) When leaving ddd, a message says that gdb is still busy. After confirming, it takes 2 sec until ddd really terminates. It prints 2 lines to the starting console:
/bin/sh -c 'exec gdb -q -fullname' [14197]: Terminated
/bin/sh -c 'exec gdb -q -fullname' [14197]: Agent wouldn't die (Terminated)

Version information:
This is on a Gentoo linux system, with the gentoo packages
sys-devel/gcc-3.1.1-r1
dev-util/ddd-3.3.1-r2
sys-libs/glibc-2.2.5-r7
sys-devel/gdb-5.2.1

Thanks in advance for any help!

--
DI. Dr. Klaus Kusche
Email: address@hidden        WWW: http://members.inode.at/kusche
Phone @ home: +43 7234 83894             Phone @ work: +43 732 673368 0
Private address:               Buchenweg 15, A-4100 Ottensheim, Austria
Office address: HTBLA Leonding, Limesstr. 12-14, 4060 Leonding, Austria





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