It's not clear to me what your debugger trace output is showing?

It's showing the stack trace of all threads at the time of the hang. I started by running the program outside the debugger. It then hung as follows:

i=365:---
parent 3980: continue
kid=1 3980 before require
parent 3980: continue
parent 3980: waiting for join
kid=2 3980 before require
kid=1 3980 after require
parent 3980: thread exited
parent 3980: waiting for join
kid=2 3980 after require
parent 3980: thread exited
i=366:---
parent 3980: continue
kid=1 3980 before require
parent 3980: continue
parent 3980: waiting for join
kid=2 3980 before require

[download]

Using the sysinternals pslist command in another window showed all threads waiting.

pslist -d perl

perl 3980:
 Tid Pri    Cswtch            State     User Time   Kernel Time   Elap
+sed Time
6108   8     10366     Wait:UserReq   0:00:20.296   0:00:00.375    0:0
+7:47.367
3856   8       304     Wait:UserReq   0:00:00.062   0:00:00.062    0:0
+5:40.338
2784   9       282   Wait:Executive   0:00:00.062   0:00:00.046    0:0
+5:40.307

[download]

I then right clicked on the hung process in Windows Task Manager then clicked Debug which invoked WinDbg and then issued the ~* kv command to show the stack trace of all threads. After doing that, pslist output changed as follows:

pslist -d perl

perl 3980:
 Tid Pri    Cswtch            State     User Time   Kernel Time   Elap
+sed Time
6108  10     10380   Wait:Suspended   0:00:20.296   0:00:00.375    0:1
+1:41.922
3856  10       316   Wait:Suspended   0:00:00.062   0:00:00.062    0:0
+9:34.893
2784   9       290   Wait:Suspended   0:00:00.062   0:00:00.046    0:0
+9:34.862
5480  10        14   Wait:Executive   0:00:00.000   0:00:00.000    0:0
+1:08.299

[download]

In reply to Re^4: Perl threads test intermittently hangs on Windows by eyepopslikeamosquito
in thread Perl threads test intermittently hangs on Windows by eyepopslikeamosquito

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