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  1. JDK
  2. JDK-8300821

UB: Applying non-zero offset to non-null pointer 0xfffffffffffffffe produced null pointer

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      Undefined Behavior discovered after turning "UndefinedBehaviorSanitizer" in Xcode running simple HelloWorld java app. More info on clang undefined behavior sanitizer can be found https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html

      /Users/gerard/Work/tmp/jdk/src/hotspot/share/code/relocInfo.hpp:612 Applying non-zero offset to non-null pointer 0xfffffffffffffffe produced null pointer

      Nullptr after nonzero offset
      #0 0x0000000110fab777 in RelocIterator::next() at /Users/gerard/Work/tmp/jdk/src/hotspot/share/code/relocInfo.hpp:612
      #1 0x0000000110a0d147 in CodeBuffer::relocate_code_to(CodeBuffer*) const at /Users/gerard/Work/tmp/jdk/src/hotspot/share/asm/codeBuffer.cpp:783
      #2 0x0000000110a0c8a7 in CodeBuffer::copy_code_to(CodeBlob*) at /Users/gerard/Work/tmp/jdk/src/hotspot/share/asm/codeBuffer.cpp:719
      #3 0x0000000110f53753 in RuntimeBlob::RuntimeBlob(char const*, CodeBuffer*, int, int, int, int, OopMapSet*, bool) at /Users/gerard/Work/tmp/jdk/src/hotspot/share/code/codeBlob.cpp:161
      #4 0x0000000110f54e6b in RuntimeStub::RuntimeStub(char const*, CodeBuffer*, int, int, int, OopMapSet*, bool) at /Users/gerard/Work/tmp/jdk/src/hotspot/share/code/codeBlob.cpp:406
      #5 0x0000000110f54ee8 in RuntimeStub::RuntimeStub(char const*, CodeBuffer*, int, int, int, OopMapSet*, bool) at /Users/gerard/Work/tmp/jdk/src/hotspot/share/code/codeBlob.cpp:407
      #6 0x0000000110f54fff in RuntimeStub::new_runtime_stub(char const*, CodeBuffer*, int, int, OopMapSet*, bool) at /Users/gerard/Work/tmp/jdk/src/hotspot/share/code/codeBlob.cpp:422
      #7 0x000000011085c867 in StubGenerator::generate_jfr_write_checkpoint() at /Users/gerard/Work/tmp/jdk/src/hotspot/cpu/aarch64/stubGenerator_aarch64.cpp:6967
      #8 0x0000000110856f93 in StubGenerator::generate_phase1() at /Users/gerard/Work/tmp/jdk/src/hotspot/cpu/aarch64/stubGenerator_aarch64.cpp:7965
      #9 0x0000000110856d0b in StubGenerator::StubGenerator(CodeBuffer*, int) at /Users/gerard/Work/tmp/jdk/src/hotspot/cpu/aarch64/stubGenerator_aarch64.cpp:8121
      #10 0x0000000110856c48 in StubGenerator::StubGenerator(CodeBuffer*, int) at /Users/gerard/Work/tmp/jdk/src/hotspot/cpu/aarch64/stubGenerator_aarch64.cpp:8117
      #11 0x0000000110856bfb in StubGenerator_generate(CodeBuffer*, int) at /Users/gerard/Work/tmp/jdk/src/hotspot/cpu/aarch64/stubGenerator_aarch64.cpp:8133
      #12 0x0000000110e7095b in StubRoutines::initializeContinuationStubs() at /Users/gerard/Work/tmp/jdk/src/hotspot/share/runtime/stubRoutines.cpp:279
      #13 0x0000000110e71c58 in stubRoutines_initContinuationStubs() at /Users/gerard/Work/tmp/jdk/src/hotspot/share/runtime/stubRoutines.cpp:389
      #14 0x0000000110eb94b7 in init_globals() at /Users/gerard/Work/tmp/jdk/src/hotspot/share/runtime/init.cpp:129
      #15 0x0000000110efb29f in Threads::create_vm(JavaVMInitArgs*, bool*) at /Users/gerard/Work/tmp/jdk/src/hotspot/share/runtime/threads.cpp:564
      #16 0x0000000111111b0b in JNI_CreateJavaVM_inner(JavaVM_**, void**, void*) [inlined] at /Users/gerard/Work/tmp/jdk/src/hotspot/share/prims/jni.cpp:3591
      #17 0x0000000111111a74 in ::JNI_CreateJavaVM(JavaVM **, void **, void *) at /Users/gerard/Work/tmp/jdk/src/hotspot/share/prims/jni.cpp:3677
      #18 0x0000000111111a73 in ::JNI_CreateJavaVM(JavaVM **, void **, void *) at /Users/gerard/Work/tmp/jdk/src/hotspot/share/prims/jni.cpp:3671
      #19 0x00000001001027f7 in InitializeJVM [inlined] at /Users/gerard/Work/tmp/jdk/src/java.base/share/native/libjli/java.c:1459
      #20 0x0000000100102744 in JavaMain at /Users/gerard/Work/tmp/jdk/src/java.base/share/native/libjli/java.c:413
      #21 0x0000000100102743 in JavaMain ()
      #22 0x00000001001053f7 in ThreadJavaMain at /Users/gerard/Work/tmp/jdk/src/java.base/macosx/native/libjli/java_md_macosx.m:720
      #23 0x00000001000995d3 in _pthread_start ()

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              tholenstein Tobias Holenstein
              gziemski Gerard Ziemski
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