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I thought it was an apache problem, however, aplog_error (actually ap_log_error) in main.c (224) should escape any % signs before sending the log message to apache. ap_error_log expects a format string followed by varargs - but we're only ever sending the log message - so we need to do a find/replace of every % with %% in order to keep apache from crashing.
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Fixed in CVS for 3.0.13 by changing call to aplog_error; use
(..., "%s", log_message) rather than (..., log_message).
(Forgot to set to 'closed')