This is utput from strace on linux, I have seen
similar spinning after a test has completed on win32
and the behavior looks similar.  The symptoms are
definitely similar. After I strace the proc it stops
consuming the cpu but the process is still running and
looking like a deadlock.

This is repeated many times,  

[pid   396] gettimeofday({1192565615, 306474}, NULL) =
0
[pid   305] <... futex resumed> )       = 1
[pid   321] <... futex resumed> )       = 0
[pid   396] futex(0x80564a0, FUTEX_WAIT, 2, NULL
<unfinished ...>
[pid   305] gettimeofday( <unfinished ...>
[pid   321] futex(0x80564a0, FUTEX_WAKE, 1 <unfinished
...>
[pid   396] <... futex resumed> )       = -1 EAGAIN
(Resource temporarily unavailable)
[pid   396] futex(0x80564a0, FUTEX_WAKE, 1) = 0
[pid   305] <... gettimeofday resumed> {1192565615,
306909}, NULL) = 0
[pid   321] <... futex resumed> )       = 0
[pid   396] futex(0x80575d0, FUTEX_WAIT, 2, NULL
<unfinished ...>
[pid   305] futex(0x80575d0, FUTEX_WAIT, 2, NULL
<unfinished ...>
[pid   321] futex(0x80575d0, FUTEX_WAKE, 1 <unfinished
...>
[pid   305] <... futex resumed> )       = -1 EAGAIN
(Resource temporarily unavailable)
[pid   321] <... futex resumed> )       = 1
[pid   318] <... futex resumed> )       = 0
[pid   305] futex(0x80575d0, FUTEX_WAKE, 1 <unfinished
...>
[pid   321] gettimeofday({1192565615, 309070}, NULL) =
0
[pid   321] futex(0x80575d0, FUTEX_WAIT, 2, NULL
<unfinished ...>
[pid   322] <... futex resumed> )       = 0
[pid   305] <... futex resumed> )       = 1
[pid   322] futex(0x80575d0, FUTEX_WAIT, 2, NULL
<unfinished ...>
[pid   305] gettimeofday({1192565615, 309863}, NULL) =
0
[pid   305] futex(0x80575d0, FUTEX_WAIT, 2, NULL
<unfinished ...>
[pid 32765] <... futex resumed> )       = -1 ETIMEDOUT
(Connection timed out)
[pid 32765] futex(0x67d5e128, FUTEX_WAKE, 1) = 0



      
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