[Bug 672177] Re: libc6 upgrade causes umount to fail on shutdown because init cannot be restarted

[Scott James Remnant]

On Tue, Dec 28, 2010 at 6:47 AM, Clint Byrum <clint at fewbar.com> wrote:

> This makes sense, because telinit u just sends SIGTERM to upstart, which
> has no handler, as it was removed by revision 977, and doesn't seem to
> have been added back. Since SIG_DFL signals are not delivered to init,
> I'm not sure how umountroot's call to 'telinit u' can help in this case.
>
> Unless I'm missing something in upstart's code (quite likely) I think
> there may still potentially need to be a change in upstart to support
> re-executing.
>
Hmm, while that handled was removed Upstream, the code should have
been retained in the Ubuntu package as part of the "telinit u" patch.

The idea is that rather than doing a full state transfer, Upstart just
re-exec's itself and loses all state.  That's why we do it as the last
thing before unmounting the root on shutdown, because it then doesn't
matter about the state - there shouldn't be any.

Maybe that part of the patch has been lost?

Scott

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https://bugs.launchpad.net/bugs/672177

Title:
  libc6 upgrade causes umount to fail on shutdown because init cannot be restarted