tcmalloc:span_fuzz: Segv on unknown address with empty stacktrace

Detailed Report: https://oss-fuzz.com/testcase?key=6375963914993664 Project: tcmalloc Fuzzing Engine: libFuzzer Fuzz Target: spanfuzz Job Type: libfuzzerasantcmalloc Platform Id: linux Crash Type: Segv on unknown address Crash Address: Crash State: NULL Sanitizer: address ASAN Crash Revision:...