JDK-8246183 : Scanner/ScanTest.java fails due to SIGSEGV in StubRoutines::jshort_disjoint_arraycopy
  • Type: Bug
  • Component: core-libs
  • Sub-Component: java.util
  • Affected Version: 15
  • Priority: P1
  • Status: Closed
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2020-05-29
  • Updated: 2020-07-21
  • Resolved: 2020-05-30
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JDK 15
15 b26Fixed
Related Reports
Relates :  
JDK-8246282 - [REDO] JDK-8245121 (bf) XBuffer.put(Xbuffer src) can give unexpected result when storage overlaps
Relates :  
JDK-8245121 - (bf) XBuffer.put(Xbuffer src) can give unexpected result when storage overlaps
Description
The following test failed in the JDK15 CI:

java/util/Scanner/ScanTest.java

Here's a snippet from the log file:

#section:main
----------messages:(5/210)----------
command: main ScanTest
reason: User specified action: run main/othervm ScanTest 
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules jdk.localedata
elapsed time (seconds): 14.183
----------configuration:(3/42)----------
Boot Layer
  add modules: jdk.localedata

----------System.out:(18/1298)----------
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00007f7908dc2e00, pid=18724, tid=18759
#
# JRE version: Java(TM) SE Runtime Environment (15.0+26) (build 15-ea+26-1246)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (15-ea+26-1246, mixed mode, sharing, tiered, compressed oops, g1 gc, linux-amd64)
# Problematic frame:
# v  ~StubRoutines::jshort_disjoint_arraycopy
#
# Core dump will be written. Default location: Core dumps may be processed with "/opt/core.sh %p" (or dumping to /opt/mach5/mesos/work_dir/slaves/805146e6-8fdb-4552-bf9e-385b73cf7129-S349/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/d97c3f1c-4bae-49b8-a896-9d334254fa60/runs/def1be30-6b78-4a97-b992-af1e8ee83d63/testoutput/test-support/jtreg_open_test_jdk_tier1_part2/scratch/3/core.18724)
#
# An error report file with more information is saved as:
# /opt/mach5/mesos/work_dir/slaves/805146e6-8fdb-4552-bf9e-385b73cf7129-S349/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/d97c3f1c-4bae-49b8-a896-9d334254fa60/runs/def1be30-6b78-4a97-b992-af1e8ee83d63/testoutput/test-support/jtreg_open_test_jdk_tier1_part2/scratch/3/hs_err_pid18724.log
#
# If you would like to submit a bug report, please visit:
#   https://bugreport.java.com/bugreport/crash.jsp
#
----------System.err:(30/1170)----------
Skip patterns                 : Passed
Find patterns                 : Passed
Find to horizon test          : Passed
findInEmptyLine test          : Passed
Remove test                   : Passed
From file                     : Passed
IOException test              : Passed
Match patterns                : Passed
Delimiter test                : Passed
delim at boundary test        : Passed
Use locale test               : Passed
Close test                    : Passed
Cache test                    : Passed
Cache test2                   : Passed
Scanning non ASCII digits     : Passed
Reset test                    : Passed
Streams Close test            : Passed
Streams Comod test            : Passed
Radix out of range test       : Passed
Has next test                 : Passed
Next test                     : Passed
Has Next Pattern test         : Passed
Next pattern test             : Passed
Scan booleans                 : Passed
Scan bytes                    : Passed
Scan shorts                   : Passed
Scan ints                     : Passed
Scan longs                    : Passed
Scan floats                   : Passed
Scan doubles                  : Passed
----------rerun:(36/4605)*----------

This test is failing in all Tier1 machine configs so I'm starting
this bug out as a P1.
Comments
fix verified in jdk15 b27 ATR regression test run
21-07-2020
The solution for this bug was to backout JDK-8245121 so the summary should have been changed to: [BACKOUT] JDK-8245121 (bf) XBuffer.put(Xbuffer src) can give unexpected result when storage overlaps However, the backout changeset has already been pushed with the original summary so we'll leave it alone.
30-05-2020
URL: https://hg.openjdk.java.net/jdk/jdk/rev/2675ce2aa3db User: bpb Date: 2020-05-30 02:12:39 +0000
30-05-2020
Attached hs_err_pid48648.log. Stack trace clearly indicates Buffer code called from Scanner, indicating likely cause is JDK-8245121 which was checked in earlier today.
30-05-2020