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  1. JDK
  2. JDK-8152160

SIGFPE in CompactibleFreeListSpaceLAB::compute_desired_plab_size

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: P2
    • Resolution: Fixed
    • Affects Version/s: 9
    • Fix Version/s: 9
    • Component/s: hotspot
    • Labels:
      None
    • Subcomponent:
      gc
    • Resolved In Build:
      b115

      Description

      Running following command(run TestGCOld hotspot jtreg test) on Linux-x64 cause 64 bit JVM exit with SIGFPE signal:
      java -XX:+UseConcMarkSweepGC -XX:CMSOldPLABNumRefills=9223372036854775808 TestGCOld 10 10 10 10 100

      #
      # A fatal error has been detected by the Java Runtime Environment:
      #
      # SIGFPE (0x8) at pc=0x00007f6ca7fe2bde, pid=14991, tid=14996
      #
      # JRE version: Java(TM) SE Runtime Environment (9.0) (fastdebug build 9-internal+0-2016-03-10-011512.daholme.jdk9-hs-rt)
      # Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 9-internal+0-2016-03-10-011512.daholme.jdk9-hs-rt, mixed mode, tiered, compressed oops, concurrent mark sweep gc, linux-amd64)
      # Problematic frame:
      # V [libjvm.so+0x8b6bde] CompactibleFreeListSpaceLAB::compute_desired_plab_size()+0xbe
      #
      ...

      hs_err_pid14991.log is attached.

      Also, can be reproduced by running javac:
      javac -J-XX:+UseConcMarkSweepGC -J-XX:CMSOldPLABNumRefills=9223372036854775808 HelloWorld.java

      32 bit JVM also affected:
      java -XX:+UseConcMarkSweepGC -XX:CMSOldPLABNumRefills=2147483648 TestGCOld 10 10 10 10 100

      The problem in overflow in compute_desired_plab_size() function:
      void CompactibleFreeListSpaceLAB::compute_desired_plab_size() {
      ...
                MIN2(CMSOldPLABMax,
                     _global_num_blocks[i]/(_global_num_workers[i]*CMSOldPLABNumRefills))));
      ...
      }

      '_global_num_workers[i]*CMSOldPLABNumRefills' can results in 0 due to the overflow and this can cause division by zero.

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            • Assignee:
              sangheki Sangheon Kim
              Reporter:
              ddmitriev Dmitry Dmitriev
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              Dates

              • Created:
                Updated:
                Resolved: