Description Marc-André Laperle 2014-01-21 18:01:30 EST

Using CDT 8.3.0.201401211330
Ubuntu 13.10 64 bit host, 14.04 64 bit target
gdb 7.6.1-ubuntu
gdbserver 7.6.50.20131218-cvs-ubuntu

To be able to attach to a non-child process in Ubuntu (recent versions??) you have to change a configuration file. When attaching locally, the message indicating this is

"Could not attach to process.  If your uid matches the uid of the target
process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
again as the root user.  For more details, see /etc/sysctl.d/10-ptrace.conf"

With the default configuration files unmodified, apply these steps:

1. Create a C/C++ Attach Debug configuration. Use gdbserver as the debugger
2. Start gdbserver on the remote target
3. Select a process to debug. It silently fails.

In the gdb traces, we can see

567,922 21-target-attach --thread-group i1 2738
567,926 21^error,msg="Attaching to process 2738 failed"

This could be displayed in a dialog box, similar to when a local launch fails.