Description:
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We have a script that runs in a multiprocess way and it uses flock() for interprocess communication. Things worked fine until we moved to PHP 5.3.2 where all the processes started to hang all of a sudden. I debugged the issues and tried several fixes but they didn't solve it. 

I made an extensive log of all the script did in order to find out the reason, and I got a situation with 4 scripts running trying to get a non-blocking lock every second, and all of them wrote "lock failed" to the log. At the same time none of them was supposed to hold the lock at that time. 

Finally I added an flock($hLock, LOCK_UN); before every fclose($hLock); and  it is only that that they stopped handing. 

Test script:
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$H=fopen($LockFile, 'a'); flock($H, LOCK_EX);
//...
//flock($H, LOCK_UN); - the fix
fclose($H);

Expected result:
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no deadlock

Actual result:
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Deadlock