On Tue, 9 Sep 2014, Luis R. Rodriguez wrote:

By design it seems systemd should not allow worker processes to block
indefinitely and in fact it currently uses the same timeout for all
types of worker processes. 

And I whole-heartedly believe this is something that fundamentally needs 
to be addressed in systemd, not in the kernel.

This aproach is actually introducing a user-visible regressions. Look, for 
example, exec() never times out. Therefore if your system is on its knees, 
heavily overloaded (or completely broken), you are likely to be able to 
`reboot' it, because exec("/sbin/reboot") ultimately succeeds.

But with all the timeouts, dbus, "Failed to issue method call: Did 
not receive a reply" messages, this is getting close to impossible.

-- 
Jiri Kosina
SUSE Labs