The following test failure was spotted in the JDK13 CI:

vmTestbase/nsk/jvmti/RedefineClasses/StressRedefine/TestDescription.java

Here's a snippet of the log file:

# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (open/src/hotspot/cpu/x86/compiledIC_x86.cpp:166), pid=25415, tid=25557
# assert(old_method == __null || old_method == callee() || !old_method->method_holder()->is_loader_alive()) failed: a) MT-unsafe modification of inline cache
#
# JRE version: Java(TM) SE Runtime Environment (13.0) (fastdebug build 13-ea+0-1311)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 13-ea+0-1311, mixed mode, sharing, tiered, compressed oops, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x9e16a0][thread 25565 also had an error]
  CompiledDirectStaticCall::set_to_interpreted(methodHandle const&, unsigned char*)+0xd0
#
# Core dump will be written. Default location: /scratch/opt/mach5/mesos/work_dir/slaves/df27b84d-b5c1-4760-9e48-df95fd33274c-S285/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/52db6808-5cf9-4822-96a9-e1bebdb5dd13/runs/02b4b70d-3621-4c81-9560-4c8c96ce62e7/testoutput/test-support/jtreg_open_test_hotspot_jtreg_vmTestbase_nsk_jvmti/scratch/3/core.25415
#
# An error report file with more information is saved as:
# /scratch/opt/mach5/mesos/work_dir/slaves/df27b84d-b5c1-4760-9e48-df95fd33274c-S285/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/52db6808-5cf9-4822-96a9-e1bebdb5dd13/runs/02b4b70d-3621-4c81-9560-4c8c96ce62e7/testoutput/test-support/jtreg_open_test_hotspot_jtreg_vmTestbase_nsk_jvmti/scratch/3/hs_err_pid25415.log
Compiled method (c1) 18713 1966 ! 2 jdk.internal.reflect.GeneratedMethodAccessor1068::invoke (270 bytes)
 total in heap [0x00007f4c89232590,0x00007f4c892354c8] = 12088
 relocation [0x00007f4c89232700,0x00007f4c89232a18] = 792
 main code [0x00007f4c89232a20,0x00007f4c89234340] = 6432
 stub code [0x00007f4c89234340,0x00007f4c89234470] = 304
 oops [0x00007f4c89234470,0x00007f4c89234478] = 8
 metadata [0x00007f4c89234478,0x00007f4c892344b8] = 64
 scopes data [0x00007f4c892344b8,0x00007f4c892348a0] = 1000
 scopes pcs [0x00007f4c892348a0,0x00007f4c892350a0] = 2048
 dependencies [0x00007f4c892350a0,0x00007f4c892350b8] = 24
 handler table [0x00007f4c892350b8,0x00007f4c89235460] = 936
 nul chk table [0x00007f4c89235460,0x00007f4c892354c8] = 104
AHE@0x00007f4ca0a7d180: 0x7eab0000 i2c: 0x00007f4c88cd4960 c2i: 0x00007f4c88cd4ab2 c2iUV: 0x00007f4c88cd4a75
Compiled method (c1) 18714 1966 ! 2 jdk.internal.reflect.GeneratedMethodAccessor1068::invoke (270 bytes)
 total in heap [0x00007f4c89232590,0x00007f4c892354c8] = 12088
 relocation [0x00007f4c89232700,0x00007f4c89232a18] = 792
 main code [0x00007f4c89232a20,0x00007f4c89234340] = 6432
 stub code [0x00007f4c89234340,0x00007f4c89234470] = 304
 oops [0x00007f4c89234470,0x00007f4c89234478] = 8
 metadata [0x00007f4c89234478,0x00007f4c892344b8] = 64
 scopes data [0x00007f4c892344b8,0x00007f4c892348a0] = 1000
 scopes pcs [0x00007f4c892348a0,0x00007f4c892350a0] = 2048
 dependencies [0x00007f4c892350a0,0x00007f4c892350b8] = 24
 handler table [0x00007f4c892350b8,0x00007f4c89235460] = 936
 nul chk table [0x00007f4c89235460,0x00007f4c892354c8] = 104
Compiled method (c1) 18720 1966 ! 2 jdk.internal.reflect.GeneratedMethodAccessor1068::invoke (270 bytes)
 total in heap [0x00007f4c89232590,0x00007f4c892354c8] = 12088
 relocation [0x00007f4c89232700,0x00007f4c89232a18] = 792
 main code [0x00007f4c89232a20,0x00007f4c89234340] = 6432
 stub code [0x00007f4c89234340,0x00007f4c89234470] = 304
 oops [0x00007f4c89234470,0x00007f4c89234478] = 8
 metadata [0x00007f4c89234478,0x00007f4c892344b8] = 64
 scopes data [0x00007f4c892344b8,0x00007f4c892348a0] = 1000
 scopes pcs [0x00007f4c892348a0,0x00007f4c892350a0] = 2048
 dependencies [0x00007f4c892350a0,0x00007f4c892350b8] = 24
 handler table [0x00007f4c892350b8,0x00007f4c89235460] = 936
 nul chk table [0x00007f4c89235460,0x00007f4c892354c8] = 104