[Bug 950282] Re: Installation failing with pop-up "The installer encountered an unrecoverable error and will now reboot."

[Mario Limonciello]

I'm unsure what process called "pool" this is that shows up in dmesg,
but it can be continually triggered (with about a 75% success rate on a
machine that triggers this) just by running:

# ubiquity --automatic
# echo $?
125

Ubiquity will exit code 125 and the accompanied pool segfault shows
again in dmesg and /var/log/syslog.

Now, if pdb is to be trusted, fingers point at GTK.

---------------------------------------------------------------------
# pdb /usr/lib/ubiquity/bin/ubiquity --automatic
> /usr/lib/ubiquity/bin/ubiquity(15)<module>()
-> '''
(Pdb) break 240
Breakpoint 1 at /usr/lib/ubiquity/bin/ubiquity:240
(Pdb) cont
ste> /usr/lib/ubiquity/bin/ubiquity(240)install()
-> wizard = ui.Wizard(distro)
(Pdb) step
--Call--
> /usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py(157)__init__()
-> def __init__(self, distro):
(Pdb) break 1019
Breakpoint 2 at /usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py:1019
(Pdb) cont
break 84> /usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py(1019)allow_change_step()
-> set_root_cursor(cursor)

Breakpoint 3 at /usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py:84
cont
> /usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py(84)set_root_cursor()
-> gtkwidgets.refresh()
Segmentation Fault
---------------------------------------------------------------------

This is all that's in refresh:
def refresh():
    while Gtk.events_pending():
        Gtk.main_iteration()

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https://bugs.launchpad.net/bugs/950282

Title:
  Installation failing with pop-up "The installer encountered an
  unrecoverable error and will now reboot."

Status in “ubiquity” package in Ubuntu:
  New

Bug description:
  Running a build of Precise, I'm encountering a failure during the very
  early stages of installation.  I get a pop-up saying "The installer
  encountered an unrecoverable erro and will now reboot."

  It seems to occur when the following is present in syslog:
  Mar  8 20:30:10 ubuntu kernel: [   41.113727] pool[9204]: segfault at 17 ip 00007f022e402bfe sp 00007f0216355a20 error 6 in libc-2.15.so[7f022e2d9000+1b1000]

  Note that this is a preseeded installation.

  I'm unable to use apport to collect info because it tell tells me
  "This is not an official Ubuntu package..." and exits.

  I have attached the syslog.

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