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------- Additional Comments From [EMAIL PROTECTED]  2006-02-05 19:00 -------
short update: I'm still trying to hunt it down. here's a short summary:

Currently not reproducable at will, but steadily recurring about once a day. 

As long as I did close looks at it, there are always 2 threads with similar
stack trace ( ap_proxy_http_process_response, one ap_proxy_read_headers, the
other just ap_getline ). While one is cleaning up, the other is probably stuck
in BRIGADE_NORMALIZE (which also does some cleanup). Sounds like a race
condition where 2 threads are cleaning up the same brigade. (I will try to get
some info on the brigade that the other thread tries to cleanup, next time). 

step/next did not return the last time, so the MACRO line was never left. 

the strace close(-1) threads does only show up 1 in 10 times. Either its a
different bug or it is about the repeated cleanup/normalization of a
socket-bucket. Most of the times the threads produce no system/library calls, so
I guess they are caught in a very small loop.

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