Peter, you will not be able to reproduce on Debian unless you test
versions prior to Stable.
The reason why the stop script does not stop at all processes is because
it relied on the --pidfile option and this one only kills the first PID.
When nproc > 1, the PIDFILE contains all PIDs. This is why debian
introduced the use of --pid in a loop for all haproxy PIDs.
Now, the --pid option that is introduced in dpkg version 1.17.6 as
outlined in the man page of start-stop-daemon :
[--pid] pid
Check for a process with the specified pid (since version
1.17.6). The pid must be a number greater than 0.
This version is available in all Debian releases since Stable but only
available in Ubuntu Wily. A fix for this situation is available for
haproxy 1.5 which is in trusty-backport (see LP: #1494141). I will
backport that fix for the stable release and ask for an SRU on this one.
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https://bugs.launchpad.net/bugs/1481737
Title:
HAProxy init script does not work correctly with nbproc configuration
option
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