Hi,
We have a problem with fork for a very long time.
From time to time, fork just hangs (with 2 process doing busy loop).
The problem occurs when we do allot of spawns (make system).
It is very easy to recreate the problem, but unfortunately, there is too
much code involve to send.
I did a little investigation - when the process hangs, I took the
backtrace with process explorer.
Process explorer does not know anything about cygwin debug symbols, so
it just give an arbitrary func + offset.
Then I used gdb to find out the real function: sync_proc_pipe doing
yield in an endless loop.
It seems that there is a race condition here, since this error depends
on timing. when the CPU is very busy (e.g. when
I do while((1)); do true; done X 4 times), the frequency of the problem
is reduced.
I dug a little bit in the mailing list and found many references to fork
failure. I belive this one is similar to my problem -
http://cygwin.com/ml/cygwin/2011-04/msg00066.html
I also saw all the work done around fork lately
(http://old.nabble.com/Re%3A-Improvements-to-fork-handling-td31594702.html)
so I tried to use the latest cygwin from CVS.
This acctualy was very helpful, and this error disappear. the problem is
that many other errors/crashes are introduced!
Many perl scripts stopped working, rxvt crashes from time to time, gcc
fails with no good reason and more.
I will appreciate any advice, how can I solve this problem.
Thanks,
Yoni.
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