Errata patches for the kernel have been released for OpenBSD 6.3 and 6.4.
A recent change to POSIX file locks could cause incorrect results during
lock acquisition.
Binary updates for the amd64, i386, and arm64 platforms are available
via the syspatch utility. Source code patches can be found on the
respective errata page:
https://www.openbsd.org/errata63.html
https://www.openbsd.org/errata64.html
As these affect the kernel, a reboot will be needed after patching.
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