[Bug 246385] SIGCHLD dropped if generated while blocked in sigfastblock

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246385

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: kib
Date: Mon May 11 22:38:32 UTC 2020
New revision: 360940
URL: https://svnweb.freebsd.org/changeset/base/360940

Log:
  sigfastblock: fix delivery of the pending signals in single-threaded
processes.

  If single-threaded process receives a signal during critical section
  established by sigfastblock(2) word, unblock did not caused signal
  delivery because sigfastblock(SIGFASTBLOCK_UNBLOCK) failed to request
  ast handling of the pending signals.

  Set TDF_ASTPENDING | TDF_NEEDSIGCHK on unblock or when kernel forces
  end of sigfastblock critical section, to cause syscall exit to recheck
  and deliver any signal pending.

  Reported by:  corydoras at ridiculousfish.com
  PR:   246385
  Sponsored by: The FreeBSD Foundation

Changes:
  head/sys/kern/kern_sig.c

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