A Hammer 2 corruption bug fix is currently under test in master. My expectation is that it will be merged into the -release branch on Saturday after further testing (I will post another message then). The corruption is modestly difficult to cause but please read the commit message for more details. It can occur when significant filesystem write activity occurs during a bulkfree operation. This operation typically occurs in the early morning (~3 a.m.). The corruption is caught by the crc code and reported on the console and in /var/log/messages as CHECK FAIL entries.
https://gitweb.dragonflybsd.org/dragonfly.git/commit/83815ec6515002d007c3800cb9fd83c9451852f7 Master also has some performance work for H2 under test that may be of interest. https://gitweb.dragonflybsd.org/dragonfly.git/commit/1159c75c92fbfdd230dd598904ede92791c00843 -Matt
