[llvm-bugs] [Bug 28890] New: libFuzzer 3.8 fails with "illegal hardware instruction"

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28890

            Bug ID: 28890
           Summary: libFuzzer 3.8 fails with "illegal hardware
                    instruction"
           Product: new-bugs
           Version: 3.8
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: sylvestre at debian.org
                CC: jack.lloyd at gmail.com, llvm-bugs at lists.llvm.org,
                    vonosmas at gmail.com
        Depends on: 25991
    Classification: Unclassified

Trying the example with llvm 3.8:
http://llvm.org/docs/LibFuzzer.html

$ apt-get install libfuzzer-3.8-dev clang-3.8
[..]

$ cat << EOF > test_fuzzer.cc
#include <stdint.h>
#include <stddef.h>
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
  if (size > 0 && data[0] == 'H')
    if (size > 1 && data[1] == 'I')
       if (size > 2 && data[2] == '!')
       __builtin_trap();
  return 0;
}
EOF

$ clang++-3.8 -fsanitize=address -fsanitize-coverage=edge test_fuzzer.cc
/usr/lib/llvm-3.8/lib/libFuzzer.a

$ ./a.out
Seed: 2980367726
PreferSmall: 1
#0    READ   units: 1 exec/s: 0
#1    INITED cov: 2 units: 1 exec/s: 0
#2    NEW    cov: 3 units: 2 exec/s: 0 L: 64 MS: 0 
#657    NEW    cov: 4 units: 3 exec/s: 0 L: 64 MS: 0 
#1070    NEW    cov: 5 units: 4 exec/s: 0 L: 1 MS: 4
ShuffleBytes-ChangeByte-EraseByte-CrossOver-
#4893    NEW    cov: 6 units: 5 exec/s: 0 L: 2 MS: 2 CrossOver-ChangeBit-
#5577    NEW    cov: 7 units: 6 exec/s: 0 L: 50 MS: 1 CrossOver-
zsh: illegal hardware instruction  ./a.out

reported here:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=833563

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