The following test failed due to a SIGSEGV on Linux X64
in the slowdebug config using jdk11+23 bits:

runtime/StackGap/testme.sh

The test only failed in 1 of 3 'slowdebug' bits runs so I'm
tagging this bug as intermittent. It did not fail at all in the
'fastdebug' or 'release' bits runs.

Here is a snippet from the log file:

----------System.out:(1018/5030)----------
TESTSRC=/work/shared/bug_hunt/thread_SMR_stress/jdk11_exp/open/test/hotspot/jtreg/runtime/StackGap
TESTJAVA=/work/shared/bug_hunt/thread_SMR_stress/jdk11_exp/build/linux-x86_64-normal-server-slowdebug/images/jdk
COMPILEJAVA=/work/shared/bug_hunt/thread_SMR_stress/jdk11_exp/build/linux-x86_64-normal-server-slowdebug/images/jdk
TESTCLASSES=/work/shared/bug_hunt/thread_SMR_stress/jdk11_exp/build/linux-x86_64-normal-server-slowdebug/test-support/jtreg_open_test_hotspot_jtreg_tier1/classes/11/runtime/StackGap/testme.d
TESTOPTS=-XX:MaxRAMPercentage=1
NULL =/dev/null
PS =:
FS =/
RM =/bin/rm
CP =/bin/cp
MV =/bin/mv
CLASSPATH =.:/work/shared/bug_hunt/thread_SMR_stress/jdk11_exp/build/linux-x86_64-normal-server-slowdebug/test-support/jtreg_open_test_hotspot_jtreg_tier1/classes/11/runtime/StackGap/testme.d:/work/local/jib-dcubed/install/com/oracle/java/jib/jib/3.0-SNAPSHOT/jib-3.0-SNAPSHOT-distribution.zip/jib-3.0-SNAPSHOT-distribution/lib/jib-3.0-SNAPSHOT.jar
THIS_DIR=.
INT_VERSION=Java HotSpot 64-Bit Server VM for linux-amd64 JRE , built on Jul 21 2018 22:08:00 with gcc 7.3.0
VM_TYPE=server
VM_BITS=64
VM_OS=linux
VM_CPU=amd64
1000
999
998
<snip>
4
3
2
1
----------System.err:(4/293)----------
java version "11-internal" 2018-09-25
Java(TM) SE Runtime Environment 18.9 (slowdebug build 11-internal+0-2018-07-22-0151086.dcubed.jdk11exp)
Java HotSpot(TM) 64-Bit Server VM 18.9 (slowdebug build 11-internal+0-2018-07-22-0151086.dcubed.jdk11exp, mixed mode)
Segmentation fault (core dumped)
----------rerun:(26/2161)*----------
<snip>

result: Failed. Execution failed: exit code 139


test result: Failed. Execution failed: exit code 139