https://bugzilla.wikimedia.org/show_bug.cgi?id=42753

       Web browser: ---
            Bug ID: 42753
           Summary: DevServer.php goes unresponsive or takes 100% of CPU
           Product: MediaWiki extensions
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: minor
          Priority: Unprioritized
         Component: EventLogging
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]
    Classification: Unclassified
   Mobile Platform: ---

EventLogging includes a web server intended to handle requests for its beacon
image, *only* during development.  I find it works for a while, then goes
unresponsive.

The last time this happened it also went to 100% of my CPU.  strace shows
endless
    recvfrom(4, "", 1024, 0, NULL, NULL)    = 0
and lsof show that file descriptor 4 is 

COMMAND   PID  USER   FD   TYPE  DEVICE SIZE/OFF    NODE NAME
php     23276 spage    4u  IPv4 1437730      0t0     TCP
localhost:tproxy->localhost:40721 (CLOSE_WAIT)

Workaround: kill -9  and restart.  (For some reason a regular kill doesn't
take, despite the code to "exit cleanly on SIGTERM".)

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