Vulkan Validation lockup

https://github.com/cheako/cheako-vulkan/blob/58f0301a72bf992e0cb02995a146726cfab79bb6/vulkan_test.c#L733

Starting program: /home/cheako/src/github/cheako-vulkan/vulkan_test
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
<long, minutes, pause here>^C
Program received signal SIGINT, Interrupt.
0xf31ac713 in ?? () from /usr/lib/i386-linux-gnu/libVkLayer_core_validation.so
(gdb) bt
#0  0xf31ac713 in ?? ()
   from /usr/lib/i386-linux-gnu/libVkLayer_core_validation.so
#1  0xf31af44f in ?? ()
   from /usr/lib/i386-linux-gnu/libVkLayer_core_validation.so
#2  0xf31b2a25 in ?? ()
   from /usr/lib/i386-linux-gnu/libVkLayer_core_validation.so
#3  0xf316e9d1 in ?? ()
   from /usr/lib/i386-linux-gnu/libVkLayer_core_validation.so
#4  0xf2ff2fe7 in ?? ()
   from /usr/lib/i386-linux-gnu/libVkLayer_object_tracker.so
#5  0xf2e4947c in ?? ()
   from /usr/lib/i386-linux-gnu/libVkLayer_parameter_validation.so
#6  0xf76b4860 in ?? () from /usr/lib/i386-linux-gnu/libVkLayer_threading.so
#7  0x56558c8f in main (argc=1, argv=0xffffd8d4) at vulkan_test.c:733
(gdb)