Through code search on file spaces-inl.h, suspected CL is 
https://chromium.googlesource.com/v8/v8/+/bbf3c697aee6bcde1bf4e110c8aec5cdae26ebcf%5E%21/#F0

jgruber@, could you please take a look?

ClusterFuzz has detected this issue as fixed in range 42564:42565.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6166537351462912

Fuzzer: mbarbella_js_mutation
Job Type: linux_asan_d8_ignition_v8_arm_dbg
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  static_cast<size_t>(live_byte_count_) <= size_ in spaces-inl.h
  
Sanitizer: address (ASAN)

Regressed: V8: 42554:42555
Fixed: V8: 42564:42565

Minimized Testcase (0.41 Kb): https://cluster-fuzz.appspot.com/download/AMIfv97xMlqXl7dy6agBKOgUCX8_iysY2S-6C5HsCBKSHgPhFqcxqZe_7UEHryKTPnriajJmm8xkZf2eLywZY9P0e0YRMQ0iYetvVrgQ8P0vT91W4nxbSH1wy8mUTGOLAXHYTdG7eUxkov257g8SPDpcp9nRdoZvP4I711D4l9zBvJADO_C0Vbu4SEltFYqvTuvYF7j1xuHwU04DbbQF0hJHL0HUq3hqTBI8w3yH8hRrmdWKc-XhkG5YOnec9P3o_Y__qezPDsivlTovHGGJ38FbLgpy1iOUGgeDaoZXW7YEkG18SeiQEZ2qC5QtL3o2TH5hU9xrODQdufX_RihqWr_JnjAZd93lyBSmTe7tcN3ptSuoNr5foOo?testcase_id=6166537351462912

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 6166537351462912 is verified as fixed, so closing issue.

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