Fails to break in a XTerm started by another program

Hi,

I have one very bizarre problem with GDB (not GDB fault probably). The 
problem is that if I
have a terminal started by Code::Blocks (wxWidgets based IDE) and I run 
GDB from this
terminal, the debugger fails to break on breakpoints in a simple console 
c++ program.
The steps are as follows:
1. start Code::Blocks
2. start a terminal from inside it (Code::Blocks will start the terminal)
3. start GDB

The problem happens randomly, so if I repeat the 3 steps several times, 
most of the times
the debugger won't work and some of them - it will.

I've asked about this problem in the IRC channel and people there 
advised me to gather some
strace logs. I have the logs and they can be found here:
1. GDB works - http://pastebin.com/ubqv5XbX
2. GDB fails - http://pastebin.com/zkeJzTya

By looking at them I cannot tell where the problem is.
Can someone suggest what else can I do to find the root cause for this 
problem?

I'm running Gentoo linux 64bit, kernel 3.10.5 (for quite a while), 
up-to-date unstable system.

Best regards,
Teodor