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  1. JDK
  2. JDK-8318049

C2: assert(!failure) failed: Missed optimization opportunity in PhaseIterGVN



    • b21


      java -XX:CompileCommand=quiet -XX:CompileCommand=compileonly,*Test*::* -XX:-TieredCompilation -Xcomp -XX:VerifyIterativeGVN=10 Test

      Missed Value optimization:
      dist dump
         1 1118 CastII === 1119 329 [[ 1117 ]] #int unconditional dependency !orig=[1091],[1063],[1034],[872]
         1 329 ConvL2I === _ 11 [[ 1118 925 1117 922 924 ]] #int !orig=[971],[881],[834],[527],[600],[330],335 !jvms: Test::vMeth @ bci:85 (line 67)
         0 1117 XorI === _ 329 1118 [[ 1121 ]] !orig=[1090],[1062],[1033],[875],[853],[527],[600],[330],335 !jvms: Test::vMeth @ bci:86 (line 67)
      Current type:
      Optimized type:
      # A fatal error has been detected by the Java Runtime Environment:
      # Internal Error (/System/Volumes/Data/mesos/work_dir/slaves/cd627e65-f015-4fb1-a1d2-b6c9b8127f98-S180582/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/6a2a4984-4d83-4722-b042-c2993143272c/runs/686c04b7-8c90-4e39-b85e-83f44700225c/workspace/open/src/hotspot/share/opto/phaseX.cpp:1087), pid=25494, tid=42243
      # assert(!failure) failed: Missed optimization opportunity in PhaseIterGVN
      # JRE version: Java(TM) SE Runtime Environment (22.0+19) (fastdebug build 22-ea+19-1462)
      # Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 22-ea+19-1462, compiled mode, sharing, compressed oops, compressed class ptrs, g1 gc, bsd-amd64)
      # No core dump will be written. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
      # An error report file with more information is saved as:
      # /private/tmp/fuzzer.tmp.YapA5EsTyr/hs_err_pid25494.log
      # Compiler replay data is saved as:
      # /private/tmp/fuzzer.tmp.YapA5EsTyr/replay_pid25494.log
      # If you would like to submit a bug report, please visit:
      # https://bugreport.java.com/bugreport/crash.jsp

      Current CompileTask:
      C2:552 5 b Test::vMeth (255 bytes)

      Stack: [0x000070000b703000,0x000070000b803000], sp=0x000070000b7ff370, free space=1008k
      Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
      V [libjvm.dylib+0x12199b4] VMError::report_and_die(int, char const*, char const*, __va_list_tag*, Thread*, unsigned char*, void*, void*, char const*, int, unsigned long)+0x5a4 (phaseX.cpp:1087)
      V [libjvm.dylib+0x121a148] VMError::report_and_die(Thread*, void*, char const*, int, char const*, char const*, __va_list_tag*)+0x38
      V [libjvm.dylib+0x6564a4] report_vm_error(char const*, int, char const*, char const*, ...)+0xb4
      V [libjvm.dylib+0xf4b2e0] PhaseIterGVN::verify_optimize()+0x550
      V [libjvm.dylib+0xf4b6db] PhaseIterGVN::optimize()+0x2bb
      V [libjvm.dylib+0x5ba528] Compile::process_for_post_loop_opts_igvn(PhaseIterGVN&)+0x108
      V [libjvm.dylib+0x5b5985] Compile::Optimize()+0xb65
      V [libjvm.dylib+0x5b35f3] Compile::Compile(ciEnv*, ciMethod*, int, Options, DirectiveSet*)+0x1593
      V [libjvm.dylib+0x4777e6] C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0x1a6
      V [libjvm.dylib+0x5d263f] CompileBroker::invoke_compiler_on_method(CompileTask*)+0xa9f
      V [libjvm.dylib+0x5d1797] CompileBroker::compiler_thread_loop()+0x357
      V [libjvm.dylib+0x9a9015] JavaThread::thread_main_inner()+0x1a5
      V [libjvm.dylib+0x1160fcc] Thread::call_run()+0xbc
      V [libjvm.dylib+0xeea9a2] thread_native_entry(Thread*)+0x122
      C [libsystem_pthread.dylib+0x68fc] _pthread_start+0xe0
      C [libsystem_pthread.dylib+0x2443] thread_start+0xf
      Lock stack of current Java thread (top to bottom):

      This failure mode was previously addressed by:

      JDK-8316361 C2: assert(!failure) failed: Missed optimization opportunity in PhaseIterGVN with -XX:VerifyIterativeGVN=10

      which was integrated in jdk-22+18-1378. This failure
      sighting occurred in jdk-22+19-1462-tier8.


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              jkarthikeyan Jasmine Karthikeyan
              dcubed Daniel Daugherty
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