I noticed it couple years ago after the first attempt to upgrade to 13.2-RELEASE from 13.1-RELEASE After that I have tried 14.0-RELEASE and 13.3-RELEASE, they are also don't work on this system. Today I have finally did a bisect in 13-STABLE branch and have found the problematic commit: e4d7f82bf50ae5954e59e63a8bf423b6727a7884 The kernel crashes on boot, and the next 1-3 boots from normal kernel also crashes. After several attempts the system boots normally an works fine for months.