This should be fixed by this revert that's already landed https://chromium-review.googlesource.com/#/c/995292/ (and fixed permanently by https://chromium-review.googlesource.com/c/v8/v8/+/996406)

ClusterFuzz has detected this issue as fixed in range 52343:52344.

Detailed report: https://clusterfuzz.com/testcase?key=4789837362888704

Fuzzer: mbarbella_js_mutation
Job Type: linux_cfi_d8
Platform Id: linux

Crash Type: UNKNOWN
Crash Address: 
Crash State:
  v8::internal::LocaleConvertCase
  __RT_impl_Runtime_StringToLowerCaseIntl
  v8::internal::Runtime_StringToLowerCaseIntl
  
Sanitizer: cfi (CFI)

Regressed: https://clusterfuzz.com/revisions?job=linux_cfi_d8&range=52342:52343
Fixed: https://clusterfuzz.com/revisions?job=linux_cfi_d8&range=52343:52344

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4789837362888704

See https://github.com/google/clusterfuzz-tools 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 4789837362888704 is verified as fixed, so closing issue as verified.

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