OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=38823
Crash type: Use-of-uninitialized-value
Crash state:
std::__1::__hash_iterator<std::__1::__hash_node<std::__1::__hash_value_type<std:
opencensus::tags::TagKeyRegistry::Register
opencensus::tags::TagKey::Register