[xmonad] Issue 493 in xmonad: spawnPipe opens another instance of the applicatioon

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Comment #1 on issue 493 by allber... at gmail.com: spawnPipe opens another  
instance of the applicatioon
http://code.google.com/p/xmonad/issues/detail?id=493

This suggests that xmobar is not properly configured; you have xmonad.hs  
set up with DynamicLog, but xmobar is not listening for that data (and  
therefore won't know when xmonad is restarted, so it won't shut itself  
down).  What does your ~/.xmobarrc look like?

It should include a StdinReader *and* have %StdinReader% somewhere in the  
template; if you don't do both of those, it won't be reading its input and  
(a) it won't go away on restart (b) it won't show things like current  
workspace (c) xmonad will eventually hang (unless you are using GHC from  
git, or possibly the latest prerelease that came out something like 2 days  
ago).