Looks related to asm2wasm.

ClusterFuzz has detected this issue as fixed in range 445054:445058.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=4506116685037568

Fuzzer: mbarbella_js_mutation
Job Type: windows_asan_d8
Platform Id: windows

Crash Type: UNKNOWN READ
Crash Address: 0x00000000
Crash State:
  v8::Message::ErrorLevel
  v8::internal::MessageHandler::ReportMessage
  v8::internal::AsmJs::CompileAsmViaWasm
  
Sanitizer: address (ASAN)

Regressed: https://cluster-fuzz.appspot.com/revisions?job=windows_asan_d8&range=444720:444724
Fixed: https://cluster-fuzz.appspot.com/revisions?job=windows_asan_d8&range=445054:445058

Minimized Testcase (0.12 Kb):
Download: https://cluster-fuzz.appspot.com/download/AMIfv9766v-iAT1XnXgHC52snAN09yEnH2dyjmBd4xizk-xb06jkU3EtVsJA0pQSvfFwn2NjoFoxwFsYp9QRMu9y3rxaxCIKw449zo47gyaInsB6TMbF5WglY3HfWOTb8_Nn6aoosNzHgoiv22frgZQPSc5Kn2YtllyNDjRGNKdUwnNqqJ_MYocEwDzR5IIvIGD5Ba6KiiEr6MBZm2YekT2NBG7TvXoPU5v42jyUTP6xyHhHg4o8Wuk3YWxS72H32Nyl8XBNAYIBvyo9Aiqkv3mc7EobX7uA_cyeqJols-NWld9P39nPqmOmBHswmWuFjLNXIKw3q6xAKGVq6GJrTrMQLOwD8QkDYVMFYl2cHE-tPZiLcpR6Bpk?testcase_id=4506116685037568
function __f_2() {
  "use asm";
  function __f_3() {
    switch (11) {
      case 0:
        break foo;
    }
  }
}
__f_2();


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

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

ClusterFuzz testcase 4506116685037568 is verified as fixed, so closing issue.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.