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In https://source.isc.org/git/bind9.git, since the following commit applied: ... commit b99bfa184bc9375421b5df915eea7dfac6a68a99 Author: Evan Hunt <each@isc.org> Date: Wed Apr 10 13:49:57 2013 -0700 [master] unify internal and export libraries 3550. [func] Unified the internal and export versions of the BIND libraries, allowing external clients to use the same libraries as BIND. [RT #33131] ... (git show b99bfa184bc9375421b5df915eea7dfac6a68a99 -- ./lib/isc/unix/app.c) In this commit, if bind9 enable threads(ISC_PLATFORM_USETHREADS), it blocks signal SIGHUP, SIGINT and SIGTERM in isc__app_ctxstart. Which caused dhclient/dhcpd could not be stopped by SIGTERM. It caused systemd's reboot hung which send SIGTERM by default. (From OE-Core rev: 7d3e734481e5d400d03ffd0a12669913fd264c5f) Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com> Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>