I was working with someone on another issue recently, and he pointed out
a situation where someone had used this:

start on starting rc RUNLEVEL=[06]

to run a specific task before the system shut down.

It got me thinking, should we instead just transition services that need
to start before shutdown to


stop on starting rc RUNLEVEL=[016]


That would cause these jobs to stop fully before any of the bits of the 
shutdown run. They'd still shutdown in parallel, so it wouldn't make the 
shutdown slower.

I do think you have to do *all* services like this. Even one left
holding deleted libraries open can still ruin the shutdown process.

Anyway, I like this even shorter term solution because it allows us to
SRU individual problem daemons such as mysql without creating a new
event.

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https://bugs.launchpad.net/bugs/688541

Title:
  race condition on shutdown (leads to corrupted fs)

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