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

[Clint Byrum]

On Tue, 2011-02-01 at 16:17 +0000, ingo wrote:
> > you can put this just after the remounts:
> > lsof -n | grep DEL
> > sleep 10
> 
> *Lucid-amd64*
> I did so (with new libc6 and upstart from Lucid-proposed installed) and found something new:
> it's the NFS which makes trouble. Portmap and statd are still running!
> 
> (I just list the essential information here, as I took a screenshot, but
> could upload the *.png as well.)
> 
> init: Re-executing /sbin/init
> mount: / is busy
> portmap    445   daemon  DEL  REG   8,1   /lib/libnsl-2.11.1.so
>        "                                                                  /lib/libc-2.11.1.so
>        "                                                                  /lib/ld-2.11.1.so
> rpc.statd   602    statd        DEL  REG   8,1   /lib/libnss_files-2.11.1.so
>        "                                                                  /lib/libnsl-2.11.1.so
>        "                                                                  /lib/libc-2.11.1.so
>        "                                                                  /lib/ld-2.11.1.so
> 

Ingo, thanks for the rapid feedback!

I think this is actually a new bug against portmap caused by its
migration to upstart.

/etc/init.d/umountnfs.sh defines

# Should-Stop:       $network $portmap nfs-common

And portmap actually does tell dh_installinit to stop after umountnfs:

dh_installinit --name portmap -- start 43 S 2 3 4 5 . start 32 0 6 .
stop 81 1 .

But there is no way to codify that point in the shutdown into the
upstart job, which I suspect is why it has no stop on. I believe the
proper way to handle this is to have a matching event to
remote-filesystems , unmounted-remote-filesystems, with which to stop
on, and then have umountnfs.sh emit that. A more succinct method would
be to simply add

stop portmap 2>/dev/null || :

to umountnfs.sh

Either way, portmap should be responsible for shutting down at the right
moment, and so I've opened bug #711425 against portmap.

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

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