[Bug 927028] [NEW] 'apropos' maxes out CPU when run with '/bin/*' as argument

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When 'apropos' is executed with an argument containing a list of files
in a directory (e.g., '/bin/*'), it maxes out the CPU for a good long
while (~40 seconds for /bin/*, about 9.5 minutes for /usr/bin/[a-z]*).

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ben at feynman:~$ apropos ~/bin/* & sleep 2; top -b -p $! -d 1 -n 3
[2] 9671

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                             
 9671 ben       20   0  7080 2224  928 R   100  0.2   0:02.46 apropos                                             


  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                             
 9671 ben       20   0  7012 2160  928 R   101  0.2   0:03.45 apropos                                             


  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                             
 9671 ben       20   0  7012 2164  928 R   100  0.2   0:04.44 apropos                                             
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ben at feynman:~$ dpkg -S /usr/bin/apropos
man-db: /usr/bin/apropos

ben at feynman:~$ lsb_release -rd
Description:    Ubuntu 11.10
Release:        11.10

ben at feynman:~$ apt-cache policy man-db
man-db:
  Installed: 2.6.0.2-2
  Candidate: 2.6.0.2-2
  Version table:
 *** 2.6.0.2-2 0
        500 http://us.archive.ubuntu.com/ubuntu/ oneiric/main i386 Packages
        100 /var/lib/dpkg/status

** Affects: man-db (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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'apropos' maxes out CPU when run with '/bin/*' as argument
https://bugs.launchpad.net/bugs/927028
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