top displaying 9999% CPU usage

[Frans Pop <elendil@planet.nl>]

I saw top occasionally displaying 9999% CPU usage for a process. The
first few times it was amarokapp, this last time it was kontact.
Both applications were basically idle.
The "cc1" is a kernel compile (rc9 + CFS :-).

I cannot remember seeing this before, but as I also don't run top that
frequently I cannot be sure its a recent regression.

$ uname -a
Linux faramir 2.6.23-rc9 #1 SMP Tue Oct 2 11:16:15 CEST 2007 x86_64 GNU/Linux

top - 14:28:27 up 38 min,  1 user,  load average: 1.12, 0.67, 0.32
Tasks: 128 total,   2 running, 126 sleeping,   0 stopped,   0 zombie
Cpu(s): 32.0%us, 15.7%sy,  0.0%ni, 43.8%id,  8.5%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   2054476k total,   998460k used,  1056016k free,    95284k buffers
Swap:   979924k total,        0k used,   979924k free,   485804k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 5269 fjp       20   0  441m  58m  32m S 9999  2.9   0:16.34 kontact
                                         ^^^^
 8272 fjp       20   0  5952  468  208 S    3  0.0   0:04.62 faked-sysv
 3666 fjp       20   0 25268 2036  884 S    2  0.1   0:03.30 famd
26530 fjp       20   0 20932 6292 1568 R    2  0.3   0:00.06 cc1
 5124 fjp       20   0  210m  26m  19m S    1  1.3   0:09.18 kicker
17012 fjp       20   0 19016 1252  916 R    1  0.1   0:00.34 top
 5159 fjp       20   0  508m  54m  30m S    0  2.7   0:12.67 amarokapp
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