Predator and CL could not provide any possible suspects.
Using Code Search for the file, "ThreadState.h" assigning to the concern owner.

Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/e24cb139f9106e3993f52047f8a3ffaa9b5876ac

@hajimehoshi -- Could you please look into the issue, kindly re-assign if this is not related to your changes.
Thank You.

Automatically applying components based on information from OWNERS files. If this seems incorrect, please apply the Test-Predator-Wrong-Components label.

For more information, please see https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reference.md.

The link referenced in the description is no longer valid.

Jeremy, can you take a look? The fuzzer crash is in the SerializedScriptValueFuzzer.

This also smells like LLVMFuzzerInitialize not getting called.

Indeed, thanks for adding me! I'll land necessary fixes.

Actually, I'll probably fix those on a per fuzzer basis. Keeping this issue assigned to me.

ClusterFuzz has detected this issue as fixed in range 526949:527421.

Detailed report: https://clusterfuzz.com/testcase?key=6016072892547072

Fuzzer: libFuzzer_v8_serialized_script_value_fuzzer
Job Type: mac_libfuzzer_chrome_asan
Platform Id: mac

Crash Type: Null-dereference READ
Crash Address: 0x000000000000
Crash State:
  blink::ThreadState::Current
  unsigned char* blink::ThreadHeap::Allocate<WTF::Vector<blink::Member<blink::Mess
  blink::LLVMFuzzerTestOneInput
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=mac_libfuzzer_chrome_asan&range=447329:447345
Fixed: https://clusterfuzz.com/revisions?job=mac_libfuzzer_chrome_asan&range=526949:527421

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6016072892547072

See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reference.md for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.