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  1. JDK
  2. JDK-8282844

Shenandoah Generational: Investigate assertion failure during verification before mark

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    • gc
    • generic
    • generic

    Description

      When executing:

          ~/Devel/kdnilsen/gitfarm/balance-without-cancel/build/linux-x86_64-server-slowdebug/jdk/bin/java \
          -XX:-UseNUMA -XX:ActiveProcessorCount=8 \
          -Xmx8g -XX:+UseShenandoahGC -XX:ShenandoahGCMode=generational \
          -XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions -XX:-ShenandoahPacing \
          -XX:+ShenandoahVerify -XX:-ShenandoahUncommit \
          -Xlog:gc*=info,safepoint*=info:results/genshen/dacapo-hunt/eclipse.jvm.log::filecount=0,filesize=0 \
          -javaagent:"/home/ubuntu/Devel/kdnilsen/lib/jHiccup-2.0.10/jHiccup.jar=-l,results/genshen/dacapo-hunt/h2.jhiccup.log,-i,1000,-a" \
          -jar ~/Devel/kdnilsen/lib/dacapo-evaluation-git+309e1fa.jar \
          --scratch-directory ~/Devel/kdnilsen/tmp/dacapo \
          --no-validation --converge --variance 5 --no-pre-iteration-gc \
          --iterations 10 --size small eclipse

      We experience the intermittent crash:
      Run Generational Balanced Remset Without Cancel branch with memory size 8g on dacapo eclipse
      Unzip workspace
      Initialize workspace # To suppress the following error report, specify this argument
      # after -XX: or in .hotspotrc: SuppressErrorAt=/shenandoahVerifier.cpp:101
      [thread 1062240 also had an error]
      #
      # A fatal error has been detected by the Java Runtime Environment:
      #
      # Internal Error (/home/ubuntu/Devel/kdnilsen/gitfarm/balance-without-cancel/src/hotspot/share/gc/shenandoah/shenandoahVerifier.cpp:101), pid=1062238, tid=1062302
      # Error: Before Mark, Roots; Object start should be within the region

      Referenced from:
        interior location: 0x0000001001c5f868
        inside Java heap
          not in collection set
        region: | 6|P |O|BTE 1001c00000, 1001ffff90, 1002000000|TAMS 1001ffff90|UWM 1001ffff90|U 4095K|T 0B|G 0B|G 0B|S 4095K|L 4095K|CP 0

      Object:
        0x0000001004554aa0 - safe print, no details
        region: | 16|R |Y|BTE 1004400000, 1004406138, 1004800000|TAMS 1004406138|UWM 1004800000|U 24888B|T 0B|G 0B|G 0B|S 24888B|L 0B|CP 0

      Raw heap memory:
      0x0000001004554a80: 0000000f 0000000f 00002000 00000000
      0x0000001004554a90: 00000000 00000000 003c90e7 00000000
      0x0000001004554aa0: 0440223b 00000010 00064e10 3ab0eb94
      0x0000001004554ab0: 0038b3f0 00389a61 00000000 00000000
      0x0000001004554ac0: 0440225b 00000010 00065058 00000100
      0x0000001004554ad0: 00000000 00000000 00000000 00000000
      0x0000001004554ae0: 000bce33 00000000 00000000 00880505
      0x0000001004554af0: 00000000 00000000 0038bec0 00000000
      0x0000001004554b00: 00000000 000b873f 003c7b5c 00000000
      0x0000001004554b10: 003b8bbb 00000000 00000000 00000000


      #
      # JRE version: OpenJDK Runtime Environment (19.0) (slowdebug build 19-internal+0-adhoc.ubuntu.balance-without-cancel)
      # Java VM: OpenJDK 64-Bit Server VM (slowdebug 19-internal+0-adhoc.ubuntu.balance-without-cancel, mixed mode, tiered, compressed oops, compressed class ptrs, shenandoah gc, linux-amd64)
      # Core dump will be written. Default location: Core dumps may be processed with "/usr/share/apport/apport %p %s %c %d %P %E" (or dumping to /home/ubuntu/Devel/kdnilsen/tmp/debug-balance/core.1062238)
      #
      # An error report file with more information is saved as:
      # /home/ubuntu/Devel/kdnilsen/tmp/debug-balance/hs_err_pid1062238.log
      [thread 1062301 also had an error]
      [thread 1062303 also had an error]
      #
      # If you would like to submit a bug report, please visit:
      # https://bugreport.java.com/bugreport/crash.jsp
      #
      1 rr has recorded a crash (134) in /home/ubuntu/Devel/kdnilsen/tmp/rr-hunt-eclipse/1646616374/latest-trace

      The last few lines of the GC log consist of the following:
      ...
      [6192.586s][info][gc,start ] GC(63) Concurrent reset
      [6192.590s][info][gc,task ] GC(63) Using 2 of 4 workers for concurrent reset
      [6193.308s][info][gc ] GC(63) Concurrent reset 721.647ms
      [6193.327s][info][safepoint,cleanup] updating inline caches, 0.0004119 secs
      [6193.328s][info][safepoint,cleanup] compilation policy safepoint handler, 0.0001318 secs
      [6193.329s][info][safepoint,cleanup] safepoint cleanup tasks, 0.0030982 secs
      [6193.334s][info][safepoint,stats ] Cleanup [ 22 3 ][ 178760716 4186710 2014580 184962006 ] 0
      [6193.336s][info][safepoint ] Safepoint "Cleanup", Time since last: 1012785269 ns, Reaching safepoint: 182947426 ns, At safepoint: 2014580 ns, Total: 184962006 ns
      [6193.351s][info][safepoint,cleanup] updating inline caches, 0.0001314 secs
      [6193.352s][info][safepoint,cleanup] compilation policy safepoint handler, 0.0001325 secs
      [6193.355s][info][safepoint,cleanup] safepoint cleanup tasks, 0.0044812 secs
      [6193.356s][info][gc,start ] GC(63) Pause Init Mark (YOUNG)
      [6193.358s][info][gc,task ] GC(63) Using 4 of 4 workers for init marking
      [6193.414s][info][gc,start ] GC(63) Verify Before Mark, Level 4


      It is suspected that this crash is not specific to the balance-without-crash branch of github/shenandoah.

      We have an rr recording and are investigating.

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            kdnilsen Kelvin Nilsen
            kdnilsen Kelvin Nilsen
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              Created:
              Updated:
              Resolved: