[8u] Heads-up: gc/shenandoah/cas/ReferenceCAS is failing with assert(false) failed: bad AD file

[Aleksey Shipilev]

Hi Roland,

There is a 8u test that fails with current Shenandoah 8u, that looks like a
compiler failure:

$ CONF=linux-x86_64-normal-server-fastdebug make images test
TEST="hotspot_gc_shenandoah"
...

Default case invoked for:
   opcode  = 78, "Con"
o1	Con	=== o0  [[]]  #top

--N: o1	Con	=== o0  [[]]  #top

# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc:  SuppressErrorAt=/matcher.cpp:1602
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  Internal Error
(/home/shade/trunks/shenandoah-jdk8/hotspot/src/share/vm/opto/matcher.cpp:1602),
pid=7276, tid=0x00007f87e58ed700
#  assert(false) failed: bad AD file
#
# JRE version: OpenJDK Runtime Environment (8.0) (build
1.8.0-internal-fastdebug-shade_2017_02_15_11_59-b00)
# Java VM: OpenJDK 64-Bit Server VM (25.71-b00-fastdebug mixed mode linux-amd64 )
# Failed to write core dump. Core dumps have been disabled. To enable core
dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
#
/home/shade/trunks/shenandoah-jdk8/build/linux-x86_64-normal-server-fastdebug/linux-x86_64/testoutput/JTwork/gc/shenandoah/cas/ReferenceCAS/hs_err_pid7276.log

Thanks,
-Aleksey