[xmonad] Issue 576 in xmonad: On FreeBSD Xmonad loses first hotkey sometimes

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Comment #11 on issue 576 by dernst... at gmail.com: On FreeBSD Xmonad loses  
first hotkey sometimes
https://code.google.com/p/xmonad/issues/detail?id=576

I've had this problem for some time now  
(https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=181049). Here are some  
of my observations so far:

GHC 7.4 is not affected
GHC 7.6 and 7.8 both seem to produce this bug

xmonad 0.8 did not show that bug
xmonad 0.11 did show the bug

As a workaround I copied the definition of spawn and doubleFork from xmonad  
0.8 into the xmonad 0.11 source code which then did not seem to exhibit  
this problem.

AFAICT it is related to interval timers. interval timers are supposed to be  
disabled right before execve(). executeFile does disable the interval  
timers but in some cases the call to setitimer does not always take place.  
Then the child process is terminated by a SIGALRM.

I am observing the same behaviour even when compiling with -rtsopts  
-with-rtsopts -v0.

Sadly I have no idea to fix or debug this. I started looking at the  
generated Core for affected/unaffected spawn/doubleFork versions but have  
no clue yet..


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