Based on this issue "543490"

@mvstanton: Could you please look into this issue.

Thank you.

Hi Jakob,
This is caused by https://codereview.chromium.org/2158303002 (Begin porting CallSite to C++).

We get a shared function info without a script (script is undefined), and don't expect this.

Repro steps:

1) download the minimized test case files to a directory.
2) download the driver files from https://drive.google.com/corp/drive/u/0/folders/0B9vLMqai2n71MWFaU3FUa21JdjQ
3) alter driver-v8.js as explained below.

4) run the following, x64 debug is fine.

/usr/local/google/home/mvstanton/src/v8/out/Debug/d8 --random-seed=6910623 --expose-gc --allow-natives-syntax --debug-code --es-staging --verify-heap --invoke-weak-callbacks --omit-quit mjsunit.js driver-v8.js --code-comments


where driver-v8.js has been altered to:
--------------------------------------
delete os; // Dangerous
delete Realm; // Buggy

var files = ["/usr/local/google/home/mvstanton/src/langfuzzer/case1/mutant13366_regress-2570.js",
    "/usr/local/google/home/mvstanton/src/langfuzzer/case1/mutant13370_regress-crbug-610207.js",
"/usr/local/google/home/mvstanton/src/langfuzzer/case1/mutant13372_regress-crbug-393988.js"];

for (var i = 0; i < files.length; i++) {

        // var file = readline(); if (file == null) { break; }
        var file = files[i];

        if (file == "evaluate") {
                print("Evaluation complete");
        } else if (file == "selftest") {
                print("Self-test passed");
                quit();
        } else {
                if (isNaN(file)) { loadFile(file); }
        }
}

function loadFile(lfVarx) {
        try {  
        print("Loading " + lfVarx);
        load(lfVarx);
        } catch (lfVare) {
                print("[LangFuzzDriver] " + lfVare);
                if (lfVare instanceof SyntaxError) {
                        print("[LangFuzzDriver] Syntax Error in test " + lfVarx);
                }
        }
}
-----------------------------------------

Thanks Micheal for the repro instructions!

ClusterFuzz has detected this issue as fixed in range 38132:38133.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=5460300350619648

Fuzzer: decoder_langfuzz
Job Type: linux_asan_d8
Platform Id: linux

Crash Type: UNKNOWN READ
Crash Address: 0x000000000000
Crash State:
  v8::base::NoBarrier_Load
  v8::internal::HeapObject::map_word
  v8::internal::HeapObject::map
  
Regressed: V8: r37974:37975
Fixed: V8: r38132:38133

Minimized Testcase (5.88 Kb): https://cluster-fuzz.appspot.com/download/AMIfv97fEgrvbwmxOeMBWMdCBQzCDJjw6OqxYdk2Ax0yGcPDCXFxAoSuFsrvonitokYny3tv6tUkUdB0vIhmd5eUPs8a_ZuDLKXovSctrA1OS73bLbYZqfBrOYGAyQ2PI-vyBrU9MwHY1CxP8CldM7XzNfRCaVyYNw?testcase_id=5460300350619648

See https://dev.chromium.org/Home/chromium-security/bugs/reproducing-clusterfuzz-bugs for more information.

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