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FreeBSD 11.4 kern_sigprocmask applies SIG_CANTMASK to the set for SIG_BLOCK
and SIG_SETMASK (sys/kern/kern_sig.c:1056, 1067), and sigsuspend sets its
mask through the same call (kern_sig.c:1534). The guest mask kept both bits,
so sigprocmask(SIG_BLOCK, {SIGKILL}) read back as blocked.
Co-Authored-By: Claude Sonnet 5.5 <[email protected]>