[Bug 986558] Re: precise install hangs; new install keeping existing filesystems from older release. umount fails after 'removing conflicting .. files'

[Ben Prescott]

fyi, b43 param in kernel command line relates to Bug #950295 - it has no
bearing on this bug, cannot boot this system to precise without it.

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Title:
  precise install hangs; new install keeping existing filesystems from
  older release. umount fails after 'removing conflicting .. files'

Status in “ubiquity” package in Ubuntu:
  New

Bug description:
  pre-reqs:

  re-installation of ubuntu onto an existing (eg: Oneiric) Ubuntu system
  disk is partitioned as follows.

  /dev/sda1 -> /boot ; ext4
  /dev/sda2 -> swap
  /dev/sda3 -> / ; ext4
  /dev/sda4 -> /home ; ext4

  we will reformat all but /home, which for the sake of consistency
  should have some stuff in it.

  reproduce:

  * boot off live disk
  * start installer
  * english
  * don't select updates and 3rd party software
  * 'something else' partitioning option
  --- if the three options, see screenshot "2012-04-21 13:01:56.png", are not present, the bug does not reproduce.
  * set up the partitions for use as above; format everything apart from /home
  --- see "2012-04-21 13:02:45.png"
  * install now.
  * ubiquity GUI moves on to ask about location/timezone
  * it does time servers stuff, formats partitions, and then hangs at 'removing conflicting operating system files'. 
  --- see "2012-04-21 13:03:52.png"
  --- Log output below copied from GUI shows it failed to unmount /dev/sda4 
  * it doesn't seem to time out or move on in any reasonable timeframe

  Apr 21 13:03:18 ubuntu clear_partitions: Considering /home,/dev/sda4. 
  Apr 21 13:03:18 ubuntu kernel: [  406.598322] EXT4-fs (sda4): warning: maximal mount count reached, running e2fsck is recommended
  Apr 21 13:03:18 ubuntu kernel: [  406.603309] EXT4-fs (sda4): mounted filesystem with ordered data mode. Opts: (null)
  Apr 21 13:03:18 ubuntu ubiquity: umount: /mnt/tmpmount: device is busy.
  Apr 21 13:03:18 ubuntu ubiquity:         (In some cases useful info about processes that use
  Apr 21 13:03:18 ubuntu ubiquity:          the device is found by lsof(8) or fuser(1))
  Apr 21 13:03:18 ubuntu ubiquity: 
  Apr 21 13:03:18 ubuntu ubiquity: rmdir: 
  Apr 21 13:03:18 ubuntu ubiquity: failed to remove `/mnt/tmpmount'
  Apr 21 13:03:18 ubuntu ubiquity: : Device or resource busy
  Apr 21 13:03:18 ubuntu ubiquity: 
  Apr 21 13:03:18 ubuntu ubiquity[3462]: debconffilter_done: ubiquity.components.partman_commit (current: ubi-timezone)

  * basic troubleshooting within five minutes shows the following

  root at ubuntu:~# lsof | grep sda4
  lsof: WARNING: can't stat() tmpfs file system /cow
        Output information may be incomplete.
  lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system /home/ubuntu/.gvfs
        Output information may be incomplete.
  jbd2/sda4 11906       root  cwd       DIR       0,19      280       8061 /
  jbd2/sda4 11906       root  rtd       DIR       0,19      280       8061 /
  jbd2/sda4 11906       root  txt   unknown                                /proc/11906/exe
  root at ubuntu:~# ps -fp 11906
  UID        PID  PPID  C STIME TTY          TIME CMD
  root     11906     2  0 13:03 ?        00:00:00 [jbd2/sda4-8]
  root at ubuntu:~# lsof | grep tmpm
  lsof: WARNING: can't stat() tmpfs file system /cow
        Output information may be incomplete.
  lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system /home/ubuntu/.gvfs
        Output information may be incomplete.
  root at ubuntu:~# fuser /dev/sda4
  root at ubuntu:~# fuser -m /mnt/tmpmount
  root at ubuntu:~#

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: ubiquity 2.10.4
  ProcVersionSignature: Ubuntu 3.2.0-20.33-generic-pae 3.2.12
  Uname: Linux 3.2.0-20-generic-pae i686
  ApportVersion: 1.95-0ubuntu1
  Architecture: i386
  CasperVersion: 1.312
  Date: Sat Apr 21 13:09:31 2012
  InstallCmdLine: root=/dev/nfs boot=casper netboot=nfs nfsroot=192.168.1.152:/srv/tftpboot/precise.i386 initrd=/precise.i386/casper/initrd.lz b43.blacklist=yes BOOT_IMAGE=/precise.i386/casper/vmlinuz
  LiveMediaBuild: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120328)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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