[Bug 917339] Re: 10mount: umount: /<<CHROOT>>/dev: device is busy

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** Changed in: sbuild (Debian)
       Status: New => Fix Released

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Title:
  10mount: umount: /<<CHROOT>>/dev: device is busy

Status in schroot:
  New
Status in sbuild package in Ubuntu:
  Triaged
Status in schroot package in Ubuntu:
  Triaged
Status in sbuild package in Debian:
  Fix Released

Bug description:
  This could be a bug in the underlying schroot, but I only see it when
  sbuild'ing on Precise.  After a successful build, I get this error
  message:

  
  ┌──────────────────────────────────────────────────────────────────────────────┐
  │ Cleanup                                                                      │
  └──────────────────────────────────────────────────────────────────────────────┘

  Purging /«BUILDDIR»
  Not cleaning session: cloned chroot in use
  E: 10mount: umount: /«CHROOT»/dev: device is busy.
  E: 10mount:         (In some cases useful info about processes that use
  E: 10mount:          the device is found by lsof(8) or fuser(1))
  E: precise-amd64-3dbd1d10-7148-4d72-90ce-a403014bda4d: Chroot setup failed: stage=setup-stop
  Chroot cleanup failed

  And in fact the session is still alive:

  
  % schroot --list --all-sessions
  session:precise-amd64-3dbd1d10-7148-4d72-90ce-a403014bda4d

  
  It also can't be closed:

  
  % schroot -e --all-sessions
  E: 10mount: umount: /var/lib/schroot/mount/precise-amd64-3dbd1d10-7148-4d72-90ce-a403014bda4d/dev: device is busy.
  E: 10mount:         (In some cases useful info about processes that use
  E: 10mount:          the device is found by lsof(8) or fuser(1))
  E: precise-amd64-3dbd1d10-7148-4d72-90ce-a403014bda4d: Chroot setup failed: stage=setup-stop

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