rmcilroy @ could you please look into this and please feel free to re assigned back if needed . thanks in advance 

ClusterFuzz has detected this issue as fixed in range 42415:42416.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=4908843353243648

Fuzzer: mbarbella_js_mutation
Job Type: linux_asan_d8_ignition_dbg
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  compile_job_->can_execute_on_background_thread() in compiler-dispatcher-job.cc
  
Sanitizer: address (ASAN)

Regressed: V8: r42412:42413
Fixed: V8: r42415:42416

Minimized Testcase (0.00 Kb): https://cluster-fuzz.appspot.com/download/AMIfv95tRWXDWgDp-4E5TGJ7GZsz9Ygada5GPBaYZzofuJK23uhcjWsV6VrwoX62FOjcVwwl_vHy6HPoqeAbbhiydSBhmAmSQVKHFGgLNvkMzqpeBdH1Qr4DcBhxgSnenJuT5gp39NAlrELDrLIVQL8DHWPVTQl6OWrJNTBk5sZ6iZUhCX9xy1AlHZ46nvJO313k6dP8k8VGcprAaP842oCuvJAZobHBUAVE0ghfCC1ZVAX7cYNYJB5PAdMAOllkLAdBtEv8FVA2-WrWmtbH1bYrCKwMa1gCkMpz2ERpMEFY5f75pbyxEzKjTBjzezgBWxescXf-StE7pGOzZbNJ4buUri5TBCpG543wtnmlhoZFwEeuU1UJ8I8?testcase_id=4908843353243648

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 4908843353243648 is verified as fixed, so closing issue.

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