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Jruby crashes intermittently right before coverage generation #5882

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Jruby crashes intermittently right before coverage generation#5882
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JRuby 9.2.9.0
@deivid-rodriguez

Description

@deivid-rodriguez
deivid-rodriguez
opened on Sep 19, 2019

Environment

The following is my local environment information, but CI information (where the crash happened should be the same).

$ jruby -v
jruby 9.2.8.0 (2.5.3) 2019-08-12 a1ac7ff OpenJDK 64-Bit Server VM 11.0.4+11-post-Ubuntu-1ubuntu218.04.3 on 11.0.4+11-post-Ubuntu-1ubuntu218.04.3 [linux-x86_64]

$ echo $JRUBY_OPTS 
--dev --debug -J-Xmx1024m

$ uname -a
Linux chaba 5.0.0-25-generic #26~18.04.1-Ubuntu SMP Thu Aug 1 13:51:02 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

Crash happens in activeadmin's test suite, have only seen it once on activeadmin/activeadmin#5858, but without that PR, the behavior is that sometimes jruby hangs right before coverage report generation (instead of crashing).

This is the log of the crash: https://circleci.com/gh/activeadmin/activeadmin/22252, where a backtrace can be seen:

Unhandled Java exception: java.lang.NullPointerException
java.lang.NullPointerException: null
   commonYieldPath at org/jruby/runtime/InterpretedIRBlockBody.java:127
           doYield at org/jruby/runtime/IRBlockBody.java:187
             yield at org/jruby/runtime/BlockBody.java:116
             yield at org/jruby/runtime/Block.java:170
      detectCommon at org/jruby/RubyArray.java:4756
              find at org/jruby/RubyArray.java:4729
            detect at org/jruby/RubyEnumerable.java:634
              call at org/jruby/RubyEnumerable$INVOKER$s$detect_DBG.gen:-1
              call at org/jruby/internal/runtime/methods/JavaMethod.java:575
      cacheAndCall at org/jruby/runtime/callsite/CachingCallSite.java:332
              call at org/jruby/runtime/callsite/CachingCallSite.java:86
          callIter at org/jruby/runtime/callsite/CachingCallSite.java:93
         interpret at org/jruby/ir/instructions/CallBase.java:537
       processCall at org/jruby/ir/interpreter/InterpreterEngine.java:361
         interpret at org/jruby/ir/interpreter/StartupInterpreterEngine.java:72
         interpret at org/jruby/ir/interpreter/InterpreterEngine.java:80
  INTERPRET_METHOD at org/jruby/internal/runtime/methods/InterpretedIRMethod.java:153
              call at org/jruby/internal/runtime/methods/InterpretedIRMethod.java:140
              call at org/jruby/runtime/callsite/CachingCallSite.java:141
       processCall at org/jruby/ir/interpreter/InterpreterEngine.java:345
         interpret at org/jruby/ir/interpreter/StartupInterpreterEngine.java:72
  INTERPRET_METHOD at org/jruby/internal/runtime/methods/InterpretedIRMethod.java:115
              call at org/jruby/internal/runtime/methods/InterpretedIRMethod.java:94
      cacheAndCall at org/jruby/runtime/callsite/CachingCallSite.java:332
              call at org/jruby/runtime/callsite/CachingCallSite.java:86
         interpret at org/jruby/ir/instructions/CallBase.java:540
       processCall at org/jruby/ir/interpreter/InterpreterEngine.java:361
         interpret at org/jruby/ir/interpreter/StartupInterpreterEngine.java:72
  INTERPRET_METHOD at org/jruby/internal/runtime/methods/InterpretedIRMethod.java:115
              call at org/jruby/internal/runtime/methods/InterpretedIRMethod.java:94
      cacheAndCall at org/jruby/runtime/callsite/CachingCallSite.java:332
              call at org/jruby/runtime/callsite/CachingCallSite.java:86
         interpret at org/jruby/ir/instructions/CallBase.java:540
       processCall at org/jruby/ir/interpreter/InterpreterEngine.java:361
         interpret at org/jruby/ir/interpreter/StartupInterpreterEngine.java:72
   INTERPRET_BLOCK at org/jruby/ir/interpreter/Interpreter.java:114
   commonYieldPath at org/jruby/runtime/InterpretedIRBlockBody.java:137
           doYield at org/jruby/runtime/IRBlockBody.java:187
             yield at org/jruby/runtime/BlockBody.java:116
             yield at org/jruby/runtime/Block.java:170
             yield at org/jruby/ir/runtime/IRRuntimeHelpers.java:477
         interpret at org/jruby/ir/instructions/YieldInstr.java:85
    processOtherOp at org/jruby/ir/interpreter/StartupInterpreterEngine.java:178
         interpret at org/jruby/ir/interpreter/StartupInterpreterEngine.java:104
   INTERPRET_BLOCK at org/jruby/ir/interpreter/Interpreter.java:114
   commonYieldPath at org/jruby/runtime/InterpretedIRBlockBody.java:137
              call at org/jruby/runtime/IRBlockBody.java:79
              call at org/jruby/runtime/Block.java:129
              call at org/jruby/RubyProc.java:295
              call at org/jruby/RubyProc.java:274
              call at org/jruby/RubyProc.java:266
              call at org/jruby/RubyProc$INVOKER$i$0$0$call_DBG.gen:-1
      cacheAndCall at org/jruby/runtime/callsite/CachingCallSite.java:332
              call at org/jruby/runtime/callsite/CachingCallSite.java:86
         interpret at org/jruby/ir/instructions/CallBase.java:540
       processCall at org/jruby/ir/interpreter/InterpreterEngine.java:361
         interpret at org/jruby/ir/interpreter/StartupInterpreterEngine.java:72
  INTERPRET_METHOD at org/jruby/internal/runtime/methods/InterpretedIRMethod.java:115
              call at org/jruby/internal/runtime/methods/InterpretedIRMethod.java:94
      cacheAndCall at org/jruby/runtime/callsite/CachingCallSite.java:332
              call at org/jruby/runtime/callsite/CachingCallSite.java:86
         interpret at org/jruby/ir/instructions/CallBase.java:540
       processCall at org/jruby/ir/interpreter/InterpreterEngine.java:361
         interpret at org/jruby/ir/interpreter/StartupInterpreterEngine.java:72
   INTERPRET_BLOCK at org/jruby/ir/interpreter/Interpreter.java:114
   commonYieldPath at org/jruby/runtime/InterpretedIRBlockBody.java:137
     yieldSpecific at org/jruby/runtime/IRBlockBody.java:89
     yieldSpecific at org/jruby/runtime/Block.java:139
     yieldSpecific at org/jruby/ir/runtime/IRRuntimeHelpers.java:481
         interpret at org/jruby/ir/instructions/YieldInstr.java:76
    processOtherOp at org/jruby/ir/interpreter/StartupInterpreterEngine.java:178
         interpret at org/jruby/ir/interpreter/StartupInterpreterEngine.java:104
  INTERPRET_METHOD at org/jruby/internal/runtime/methods/InterpretedIRMethod.java:115
              call at org/jruby/internal/runtime/methods/InterpretedIRMethod.java:94
      cacheAndCall at org/jruby/runtime/callsite/CachingCallSite.java:332
              call at org/jruby/runtime/callsite/CachingCallSite.java:86
          callIter at org/jruby/runtime/callsite/CachingCallSite.java:93
         interpret at org/jruby/ir/instructions/CallBase.java:537
       processCall at org/jruby/ir/interpreter/InterpreterEngine.java:361
         interpret at org/jruby/ir/interpreter/StartupInterpreterEngine.java:72
   INTERPRET_BLOCK at org/jruby/ir/interpreter/Interpreter.java:114
   commonYieldPath at org/jruby/runtime/InterpretedIRBlockBody.java:137
           doYield at org/jruby/runtime/IRBlockBody.java:187
             yield at org/jruby/runtime/BlockBody.java:116
             yield at org/jruby/runtime/Block.java:170
             yield at org/jruby/ir/runtime/IRRuntimeHelpers.java:477
         interpret at org/jruby/ir/instructions/YieldInstr.java:85
    processOtherOp at org/jruby/ir/interpreter/StartupInterpreterEngine.java:178
         interpret at org/jruby/ir/interpreter/StartupInterpreterEngine.java:104
   INTERPRET_BLOCK at org/jruby/ir/interpreter/Interpreter.java:114
   commonYieldPath at org/jruby/runtime/InterpretedIRBlockBody.java:137
              call at org/jruby/runtime/IRBlockBody.java:79
              call at org/jruby/runtime/Block.java:129
              call at org/jruby/RubyProc.java:295
              call at org/jruby/RubyProc.java:274
              call at org/jruby/RubyProc.java:270
               run at org/jruby/internal/runtime/RubyRunnable.java:105
               run at java/lang/Thread.java:748

Expected Behavior

Jruby doesn't crash nor hangs.

Actual Behavior

Jruby hangs intermittently (with simplecov 0.17.0), or crashes intermittenly (with simplecov 0.17.1).

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