Github user jpeach commented on the issue:
https://github.com/apache/trafficserver/pull/1091
FreeBSD fails with
```
FATAL: pthread_mutex_unlock(0x8057fcf90) failed: Operation not permitted (1)
```
The backtrace is:
```
(gdb) where
#0 0x0000000802f0035a in thr_kill () from /lib/libc.so.7
#1 0x0000000802f00346 in raise () from /lib/libc.so.7
#2 0x0000000802f00316 in abort () from /lib/libc.so.7
#3 0x0000000800bfbc8d in ink_abort (message_format=<value optimized out>)
at ../../../lib/ts/ink_error.cc:79
#4 0x00000000006f0502 in ~Thread (this=0x80717e000) at
../../../iocore/eventsystem/Thread.cc:52
#5 0x00000000004d738e in ~INKThreadInternal (this=0x80717e000) at
../../proxy/InkIOCoreAPI.cc:97
#6 0x00000000004d5b56 in ink_thread_trampoline (data=<value optimized out>)
at ../../proxy/InkIOCoreAPI.cc:112
#7 0x000000080253a855 in pthread_create () from /lib/libthr.so.3
#8 0x0000000000000000 in ?? ()
```
The unlock is failing with ``EPERM`` because we do't hold the lock at this
point.
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