FreeBSD deadlock (with fork?)

Ivan Voras ivoras at
Thu Sep 18 12:16:25 UTC 2008

David Naylor wrote:
> Hi,
> I have a program that spawns a lot of subprocesses (with pipes open) from 
> multiple threads.  The problem is the program often deadlocks, but not 
> consistently.  Sometimes the program can run over 5 times to competition 
> without incidence and yet othertimes it locks within a few seconds.  
> However if I limit the thread count to 1 the problem does not appear to be 
> present.  
> Here are the logs from gdb:

Are you sure it's not a design error in your program?

Your best bet for solving this problem is to try to create a minimum
program that will fail and post it here (don't post your whole program,
it's probably too big).

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