[Bug 672177] Re: libc6 upgrade causes umount to fail on shutdown

[Clint Byrum]

So this does in fact seem to be caused completely by init holding
libraries open. I patched /etc/init.d/umountfs to save the output of
lsof just before unmounting root:

clint at natty-alpha1:~$ grep DEL /lastlsof
init         1 root  DEL       REG              251,0          399654 /lib/libnss_files-2.12.2.so
init         1 root  DEL       REG              251,0          399653 /lib/libnss_nis-2.12.2.so
init         1 root  DEL       REG              251,0          399639 /lib/libnsl-2.12.2.so
init         1 root  DEL       REG              251,0          399659 /lib/libnss_compat-2.12.2.so.dpkg-new
init         1 root  DEL       REG              251,0          399660 /lib/libc-2.12.2.so
init         1 root  DEL       REG              251,0          399629 /lib/librt-2.12.2.so
init         1 root  DEL       REG              251,0          399662 /lib/libpthread-2.12.2.so
init         1 root  DEL       REG              251,0          399663 /lib/ld-2.12.2.so

This is odd, because upstart claims to suport 'telinit u' in its man
page, but it actually doesn't do anything thanks to this revision in
upstart's codebase:


------------------------------------------------------------
revno: 977
committer: Scott James Remnant <scott at netsplit.com>
branch nick: upstart
timestamp: Thu 2008-06-05 01:26:10 +0100
message:
  * init/main.c: Also remove SIGTERM handling, we don't re-exec
  properly and this is a dangerous signal to use anyway.
  (term_handler): Drop function.

So, I think glibc is doing its job calling 'telinit u' in the postinst.
This is upstart's bug. Setting to Critical in upstart now, and Invalid
in eglibc.

This is also a regression of bug #188925 , which was present in hardy,
and fixed in intrepid. Tagging regression-release.

** Changed in: upstart (Ubuntu)
   Importance: Undecided => Critical

** Changed in: eglibc (Ubuntu)
       Status: Confirmed => Invalid

** Tags added: regression-release

** Also affects: upstart
   Importance: Undecided
       Status: New

** Summary changed:

- libc6 upgrade causes umount to fail on shutdown
+ libc6 upgrade causes umount to fail on shutdown because init cannot be restarted

** Changed in: upstart (Ubuntu)
       Status: Confirmed => Triaged

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

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