Bug#709053: pbuilder: fails to upgrade chroot: "umount: /dev/shm: device is busy."

[intrigeri at debian.org]

Package: pbuilder
Version: 0.215
Severity: important

a pbuilder --update results in:

0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
W: no hooks of type E found -- ignoring
I: unmounting dev/pts filesystem
I: unmounting run/shm filesystem
W: Could not unmount run/shm: umount: /dev/shm: device is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))
W: Retrying to unmount run/shm in 5s
umount: /dev/shm: device is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))

... and the last steps loop, seemingly endlessly.

pbuilder 0.213 does not expose this problem.

-- System Information:
Debian Release: jessie/sid
  APT prefers unstable
  APT policy: (990, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.8.13+yama1 (SMP w/4 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages pbuilder depends on:
ii  coreutils              8.20-3
ii  debconf [debconf-2.0]  1.5.50
ii  debianutils            4.3.4
ii  debootstrap            1.0.51
ii  dpkg-dev               1.16.10
ii  wget                   1.14-1

Versions of packages pbuilder recommends:
ii  devscripts  2.13.2
ii  fakeroot    1.19-2
ii  sudo        1.8.5p2-1+nmu1

Versions of packages pbuilder suggests:
ii  cowdancer     0.72
ii  gdebi-core    0.9
pn  pbuilder-uml  <none>

-- debconf information:
  pbuilder/nomirror:
  pbuilder/mirrorsite: http://ftp.us.debian.org/debian/
  pbuilder/rewrite: false

Cheers,
--
  intrigeri
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