strace shows that ifdown does read the pid and SIGTERMs dhclient
correctly:
201 open("/run/dhclient.eth0.pid", O_RDONLY) = 7
201 read(7, "146\n", 4096) = 4
201 kill(146, SIGTERM) = 0
But after that pid 146 (dhclient) is still running happily. "kill 146"
also does not help (just kill -9 of course). This is apparently the real
regression, in wily and before you can TERM dhclient.
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https://bugs.launchpad.net/bugs/1556175
Title:
networking.service hangs on shutdown -- ifdown fails to kill dhclient
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