[Bug 1447600] Re: 15.04 installer hangs in partitioner during something else

[Uwe Geuder]

Now I came up with an idea how to investigate whether it is a deadlock
between mkfs and the GUI.

Under /proc/<pid>/stack one can see the call stack in the kernel space
of the process. So if the mkfs process hung in some do_write call and
the log capturing process in some do_read call that would confirm my
theory of a deadlock. Or the stacks might reveal something else.

So I tried the installation once more (actually twice), but according to
Murphy both attempts went through the formatting without hanging.
Yesterday I had nearly 10 attempts, which hung until I found the work-
around. Or my work-around was just random luck...

Anyway if anybody gets the problem again she or he might report the
stacks of mkfs and the log reading process (don't recall the exact name,
saw it yesterday)

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https://bugs.launchpad.net/bugs/1447600

Title:
  15.04 installer hangs in partitioner during something else

Status in ubiquity package in Ubuntu:
  Triaged

Bug description:
  In both Ubuntu and Lubuntu 15.04, when performing a "Something Else"
  install, the installer hangs when trying to format /.

  I was trying a Something Else install on 32 bit.  I asked to format
  sda1 as ext4 and mount at /.  I asked to not format sda3 and mount at
  /home.  I asked to use sda5 as swap.  Installer just stopped with no
  hard drive or CD activity.  No formatting was performed.

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