Hi all, We have just pushed Hyperscan 4.2.1 and 4.3.1 to Github. These releases are bugfix releases for the same bug. The change log entry: [4.3.1] 2016-08-29 - Bugfix for issue #30. In recent versions of Clang, a write to a variable was being elided, resulting in corrupted stream state after calling hs_reset_stream(). Regards, Matt.