I don't have access to bug to confirm callstack, but I expect this is a dupe of  issue 719633 .

ClusterFuzz has detected this issue as fixed in range 475922:475964.

Detailed report: https://clusterfuzz.com/testcase?key=5795705930383360

Fuzzer: libFuzzer_net_host_resolver_impl_fuzzer
Job Type: libfuzzer_chrome_msan
Platform Id: linux

Crash Type: Use-of-uninitialized-value
Crash Address: 
Crash State:
  libnss3.so
  NSS_InitReadWrite
  crypto::NSSInitSingleton::NSSInitSingleton
  
Sanitizer: memory (MSAN)

Recommended Security Severity: Medium

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_msan&range=474161:474211
Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_msan&range=475922:475964

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5795705930383360


See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reproducing.md 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