[Bug 942111] Re: ubiquity crashed in ubi-partman.py : ValueError: I/O operation on closed file

[Barry Warsaw]

I've tried various scenarios to reproduce in a VM since I don't have
physical hardware to test this on.  I'm not able to reproduce it.  In
bug 792652 Colin says:

"I believe that this is ultimately a regression caused by the fix for
bug 756920 (ubiquity r4693). In order to try to ensure that the boot
loader choice was recorded in debconf in every possible code path, this
was done in exit_ui_loops as a sort of "finally" handler. However,
exit_ui_loops is only supposed to do frontend interaction, and (as this
bug demonstrates) it isn't safe for it to attempt to talk to debconf. I
think a correct fix would move this out of exit_ui_loops again and try
to find a safer way to fix the original bug."

but I'm quite reluctant to change this code unless I can reproduce it
and/or provide a test case for the failure.  Do you have any other
suggestions for triggering this bug while under, say a vm install?

** Changed in: ubiquity (Ubuntu)
       Status: New => Incomplete

** Changed in: ubiquity (Ubuntu)
     Assignee: (unassigned) => Canonical Foundations Team (canonical-foundations)

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Title:
  ubiquity crashed in ubi-partman.py : ValueError: I/O operation on
  closed file

Status in “ubiquity” package in Ubuntu:
  Incomplete

Bug description:
  TEST CASE:
  1. Boot to a live session and start Ubiquity
  2. at partitioning step select "something else" (manual partitioning)
  3. Click on the 'Quit' button

  EXPECTED RESULT:
  Quit

  ACTUAL RESULT:
  Feb 27 17:21:50 ubuntu ubiquity[17177]: Exception in GTK frontend (invoking crash handler):
  Feb 27 17:21:50 ubuntu ubiquity[17177]: Traceback (most recent call last):
  Feb 27 17:21:50 ubuntu ubiquity[17177]:   File "/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py", line 1350, in watch_debconf_fd_helper
  Feb 27 17:21:50 ubuntu ubiquity[17177]:     return callback(source, debconf_condition)
  Feb 27 17:21:50 ubuntu ubiquity[17177]:   File "/usr/lib/ubiquity/ubiquity/filteredcommand.py", line 252, in process_input
  Feb 27 17:21:50 ubuntu ubiquity[17177]:     self.exit_ui_loops()
  Feb 27 17:21:50 ubuntu ubiquity[17177]:   File "/usr/lib/ubiquity/plugins/ubi-partman.py", line 2794, in exit_ui_loops
  Feb 27 17:21:50 ubuntu ubiquity[17177]:     bootloader_seen = self.db.fget('grub-installer/bootdev', 'seen')
  Feb 27 17:21:50 ubuntu ubiquity[17177]:   File "/usr/lib/python2.7/dist-packages/debconf.py", line 60, in <lambda>
  Feb 27 17:21:50 ubuntu ubiquity[17177]:     lambda *args, **kw: self.command(command, *args, **kw))
  Feb 27 17:21:50 ubuntu ubiquity[17177]:   File "/usr/lib/python2.7/dist-packages/debconf.py", line 64, in command
  Feb 27 17:21:50 ubuntu ubiquity[17177]:     self.write.write("%s %s\n" % (command, ' '.join(map(str, params))))
  Feb 27 17:21:50 ubuntu ubiquity[17177]: ValueError: I/O operation on closed file

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: ubiquity 2.9.21
  ProcVersionSignature: Ubuntu 3.2.0-17.27-generic-pae 3.2.6
  Uname: Linux 3.2.0-17-generic-pae i686
  ApportVersion: 1.93-0ubuntu2
  Architecture: i386
  CasperVersion: 1.304
  Date: Mon Feb 27 17:24:00 2012
  InstallCmdLine: noprompt cdrom-detect/try-usb=true persistent file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  LiveMediaBuild: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20120226)
  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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