[Bug 208132] releng/10.3 (RC3) strange SIGTERM behaviour

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208132

            Bug ID: 208132
           Summary: releng/10.3 (RC3) strange SIGTERM behaviour
           Product: Base System
           Version: 10.3-BETA2
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: John.Marshall at riverwillow.com.au

FreeBSD 10.3-RC3 #0 r297005: Fri Mar 18 21:14:17 AEDT 2016  i386
FreeBSD 10.3-RC3 #0 r297005: Fri Mar 18 16:13:17 AEDT 2016  amd64

As reported to -stable at ...

I've just upgraded two local servers from 10.3-RC2 to 10.3-RC3.  One is
i386 (Pentium 4) with 1.5GB memory; the other is amd64 (Xeon E5 x 2)
with 16GB.  Something seems to be swallowing SIGTERM sometimes.  I've
never seen this before.

rc scripts and service(8) hang when trying to stop some services.  If I
break out of the script or service command (via ctrl-C) and invoke
kill(1), passing the relevant PID, the shell prompt returns immediately
but the process doesn't terminate.  Sending SIGKILL to the process via
kill(1) does its job.

I am seeing this with:
  squid        (on both servers)
  ircd-ratbox  (on both servers)
  git_daemon

I am not seeing this (all seems normal) with:
  cupsd
  sendmail     (on both servers)

Looking back through the commits between -RC2 and -RC3, I've decided to try
backing out r296976 to see if that may be related. Building now. Will take
several hours.

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