Fatal error using flock

["Kyle R." <kroes921 at gmail dot com>]

I've run into a problem with flock while doing some parallel scripting
in bash (also seen in dash) on the latest 64-bit version of Cygwin
running on Windows 8.1. In the attached simple test case, the code
locks and unlocks a file in a loop. After the first iteration of the
loop is completed, this error is thrown:

      0 [main] flock 7008 C:\cygwin64\bin\flock.exe: *** fatal error -
NtCreateEvent(lock): 0xC0000035
./test.sh: line 12:  7008 Hangup                  flock -x 5

However, the problem doesn't occur if I comment out the "while true
do" and "done" and call the script file from a while loop in another
bash script. I found a similar problem in an older thread (here:
https://sourceware.org/ml/cygwin/2011-08/msg00480.html) which may help
to shed some light on the issue, but the inner workings of the locking
system is a bit beyond me. My full Cygwin version is "CYGWIN_NT-6.3
1.7.33-2(0.280/5/3) 2014-11-13 15:47", and my cygcheck output is
attached along with the STC and flock's stackdump. The cygcheck output
has been edited to remove one license server address.

Thanks,
Kyle R.

Attachment: stc.sh
Description: Bourne shell script

Attachment: flock.exe.stackdump
Description: Binary data

Attachment: cygcheck.out
Description: Binary data

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