Unable to provide possible suspect using Predator, CL and Code Search.
Could someone please look into the issue.

Thank You.

ClusterFuzz has detected this issue as fixed in range 512850:512880.

Detailed report: https://clusterfuzz.com/testcase?key=5170821982322688

Fuzzer: libFuzzer_net_host_resolver_impl_fuzzer
Job Type: libfuzzer_chrome_asan_debug
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  !callback_.is_null() in dns_transaction.cc
  net::DnsTransactionImpl::DoCallback
  void base::internal::FunctorTraits<void
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan_debug&range=503743:503814
Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan_debug&range=512850:512880

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5170821982322688

See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reference.md for more information.

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