Hi rmcilroy, your CL (https://chromium.googlesource.com/v8/v8/+/5f5300a61bfe51bb1ef9b5ca8709db38ce81b37d) was the only one in the revision range for this crash. Could you take a look, and retriage if necessary? Thanks!

When I run this on Debug I get the following DCHECK OpParameter<FrameStateInfo>(dummy_state).bailout_id().IsNone() in js-typed-lower, so duping with  issue 668654 

ClusterFuzz has detected this issue as fixed in range 41355:41356.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=5713010216927232

Fuzzer: decoder_langfuzz
Job Type: linux_asan_d8
Platform Id: linux

Crash Type: UNKNOWN READ
Crash Address: 0x001ebfff8003
Crash State:
  v8::internal::FixedArray::get
  v8::internal::HashTableBase::Capacity
  v8::internal::NameDictionaryBase<v8::internal::NameDictionary, v8::internal::Nam
  
Recommended Security Severity: Medium

Regressed: V8: r41208:41209
Fixed: V8: r41355:41356

Minimized Testcase (7.42 Kb): https://cluster-fuzz.appspot.com/download/AMIfv96BmnUupvigfGi8HwxMLd1R0aymSvhvBMKttjgXU1pn0RWJ9MLqAvpys3YSK2VScnI_pqME_VX_ocMVie4C8PYnP8jW50ckiXzTfFjFIvs1rgsVPqF7DJ98WOQCxu9aW7kzdF6EHiOdLVG0Axp4FosOp-ZIBA?testcase_id=5713010216927232

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.

This bug has been closed for more than 14 weeks. Removing security view restrictions.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot