lotus:fuzz_block_msg: Crash with empty stacktrace

Detailed Report: https://oss-fuzz.com/testcase?key=5524585794568192 Project: lotus Fuzzing Engine: libFuzzer Fuzz Target: fuzzblockmsg Job Type: libfuzzerasanlotus Platform Id: linux Crash Type: UNKNOWN READ Crash Address: 0xfffffffffffffff0 Crash State: NULL Sanitizer: address ASAN Recommended...