I've just reproduced it again on my laptop, did u make a directory with
the same name as above?

here is what I did:
$ cd /tmp
$ mkdir 2k5\ Express\ line+SPs
$ 2k5\ Express\ line+SPs/<tab>

And then I get the following output after waiting for a while.
No matches for: `external command', `executable file or directory', `builtin 
command', `shell function', `alias', `suffix alias', `reserved word', `job', 
`parameter', `directory after cdablevar', or `corrections'

Note: it's not an infinite loop but rather 100% CPU usage by zsh for
around 30 seconds

$ apt-cache policy zsh
zsh:
  Installed: 4.3.10-5ubuntu1
  Candidate: 4.3.10-5ubuntu1

Ubuntu 9.10

** Summary changed:

- Infinite loop in completion with certain characters in folder name
+ Problem in completion with certain characters in folder name

** Description changed:

  $  apt-cache policy zsh
  zsh:
-   Installed: 4.3.6-4ubuntu1
-   Candidate: 4.3.6-4ubuntu1
-   Version table:
+   Installed: 4.3.6-4ubuntu1
+   Candidate: 4.3.6-4ubuntu1
+   Version table:
  
- When using auto completion to list files in directories with certain
- characters, zsh enters an infinite loop and uses 100% CPU(50% to be
- precise as I have 2 cores) and has to be killed, I haven't exactly found
- out the problematic characters but I've got a reproducible case.
+ When using auto completion to list files in directories with certain 
characters, zsh enters a loop and uses 100% CPU(50% to be precise as I have 2 
cores) for a while, almost 30 seconds on Desktop
+ I haven't exactly found out the problematic characters but I've got a 
reproducible case.
  
  To reproduce do the following:
  
  $ mkdir 2k5\ Express\ line+SPs
  $ 2k5\ Express\ line+SPs/<tab>
  
  This should show files inside the empty folder you have just created but
- instead zsh enters the infinite loop(which should be done in 6 seconds
- :P)
+ instead zsh enters a loop and locks the CPU for a while.

-- 
Problem in completion with certain characters in folder name
https://bugs.launchpad.net/bugs/351129
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