An errata patch for the kernel on the sparc64 architecture has been released for OpenBSD 6.8 and OpenBSD 6.9.
On sparc64, a missaligned address could trigger a kernel assert and panic the kernel. Source code patches can be found on the respective errata pages: https://www.openbsd.org/errata68.html https://www.openbsd.org/errata69.html