In the 2017-07-07 JDK10-hs nightly, the following test:

sanity/ExecuteInternalVMTests.java

failed the following assert():

# Internal Error (/scratch/opt/jprt/T/P1/164630.iggy/s/hotspot/src/share/vm/compiler/directivesParser.cpp:573), pid=11927, tid=11930
# assert(cd.valid() == true) failed: failed on a valid DirectivesParser string
#
# JRE version: Java(TM) SE Runtime Environment (10.0) (fastdebug build 10-internal+0-2017-07-07-164630.iggy.8183991)
# Java VM: Java HotSpot(TM) Client VM (fastdebug 10-internal+0-2017-07-07-164630.iggy.8183991, mixed mode, serial gc, linux-)

This is very strange, but the crashing thread has no stack:

--------------- T H R E A D ---------------

Current thread (0xf6811800): JavaThread "main" [_thread_in_vm, id=11930, stack(0xf6916000,0xf6966000)]

Stack: [0xf6916000,0xf6966000]

--------------- P R O C E S S ---------------

Java Threads: ( => current thread )
  0xeb386400 JavaThread "Service Thread" daemon [_thread_blocked, id=11961, stack(0xeb760000,0xeb7b0000)]
  0xf68df800 JavaThread "Common-Cleaner" daemon [_thread_blocked, id=11950, stack(0xeb7b0000,0xeb800000)]
  0xf68b7400 JavaThread "Sweeper thread" daemon [_thread_blocked, id=11946, stack(0xeb930000,0xeb980000)]
  0xf68b5800 JavaThread "C1 CompilerThread0" daemon [_thread_blocked, id=11945, stack(0xeb980000,0xeba00000)]
  0xf68afc00 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=11944, stack(0xebd10000,0xebd60000)]
  0xf689b800 JavaThread "Finalizer" daemon [_thread_blocked, id=11939, stack(0xebd60000,0xebdb0000)]
  0xf6898000 JavaThread "Reference Handler" daemon [_thread_blocked, id=11938, stack(0xebdb0000,0xebe00000)]
=>0xf6811800 JavaThread "main" [_thread_in_vm, id=11930, stack(0xf6916000,0xf6966000)]

Other Threads:
  0xf6899c00 VMThread "VM Thread" [stack: 0xebf34000,0xebfb4000] [id=11935]
  0xeb388c00 WatcherThread [stack: 0xeb280000,0xeb300000] [id=11962]