[compiz] [BUG] Compiz hangs at launch when the focus windows is a swing window

[Fabien Chaillou]

Hello
As i have a java project to do i start and stop compiz with 
gnome-compiz-manager from gandalf and i just tried to relaunch compiz 
while the swing window was focused and all the interface just freezed.

Worse than that it hangs all the interface and the keyboard events are 
not processed so you can't do anything to kill compiz and start again.

But hey i have two computers so i have been able to ssh on the hanged 
one and backtrace the problem so here it is :

(gdb) where
#0  0xb7ee8410 in ?? ()
#1  0xbfb55628 in ?? ()
#2  0xffffffff in ?? ()
#3  0x00000001 in ?? ()
#4  0xb7d727cb in poll () from /lib/tls/i686/cmov/libc.so.6
#5  0xb7c21b69 in XProcessInternalConnection () from /usr/lib/libX11.so.6
#6  0xb7c21f4f in _XRead () from /usr/lib/libX11.so.6
#7  0xb7c232f1 in _XReadEvents () from /usr/lib/libX11.so.6
#8  0xb7c1c05d in XWindowEvent () from /usr/lib/libX11.so.6
#9  0x08051185 in getCurrentTimeFromDisplay ()
#10 0x0805fd7e in moveInputFocusToWindow ()
#11 0x080569a5 in addDisplay ()
#12 0x0804f770 in main ()

I also ran a strace on compiz to see what was happening and it is in an 
infinite loop on a poll syscall.
This is repeting over and over :
poll([{fd=4, events=POLLIN, revents=POLLIN}], 1, -1) = 1
read(4, "s\0\203\16\3\0\300\0\202\0\340\0037_\341l\207\4\1\0\34"..., 32) 
= 32
ioctl(4, FIONREAD, [64]) 

As a guess i pretty much think it is another java bug not really a 
compiz bug but it is pretty problematic as you only can reboot the 
computer to take control back if you can't kill compiz from another 
computer.

As a side note here is my java version ( Java HotSpot(TM) Client VM 
(build 1.6.0-rc-b104, mixed mode, sharing)) ( yeah i know rc versions 
but we must 1.6 features so i have no choice).

I hope it helps, sorry for the long post and my english.

Fabien