reinstall system extremely slow

Bug #1240699 reported by Paul Larson on 2013-10-16
14
This bug affects 3 people
Affects Status Importance Assigned to Milestone
ubiquity (Ubuntu)
Undecided
Unassigned

Bug Description

Image: 20131016.1 saucy amd64 desktop

I started an install with "reinstall system" selected on virtualbox a little over 20 min. ago. At least for the past 15 min or so, it seems to still be stuck on the "Saving installed packages" step.

A quick look at /var/log/syslog shows that it *is* making progress, but it's extremely slow. This was a test install for the iso testing before, so I didn't have loads of extra packages installed or anything. Looking at top, I saw it alternating between dpkg-deb and rcu_sched being the busiest processes, each taking 20-30% cpu or so.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: ubiquity 2.15.26
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
ApportVersion: 2.12.5-0ubuntu2
Architecture: amd64
CasperVersion: 1.336ubuntu1
Date: Wed Oct 16 15:50:06 2013
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
LiveMediaBuild: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MarkForUpload: True
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

Paul Larson (pwlars) wrote :
Ubuntu QA Website (ubuntuqa) wrote :

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1240699

tags: added: iso-testing
Brian Murray (brian-murray) wrote :

I believe this is where things start to go wrong:

Oct 16 20:31:12 ubuntu ubiquity: Use of uninitialized value in concatenation (.) or string at /usr/share/perl5/Debconf/DbDriver/File.pm line 44.
Oct 16 20:31:12 ubuntu ubiquity: Use of uninitialized value in -e at /usr/share/perl5/Debconf/DbDriver/File.pm line 46.
Oct 16 20:31:12 ubuntu ubiquity: Use of uninitialized value in pattern match (m//) at /usr/share/perl5/Debconf/DbDriver/File.pm line 47.
Oct 16 20:31:12 ubuntu ubiquity: Use of uninitialized value $directory in -d at /usr/share/perl5/Debconf/DbDriver/File.pm line 48.
Oct 16 20:31:12 ubuntu ubiquity: Use of uninitialized value $directory in concatenation (.) or string at /usr/share/perl5/Debconf/DbDriver/File.pm line 49.
Oct 16 20:31:12 ubuntu ubiquity: debconf: DbDriver "targetdb": mkdir :No such file or directory
Oct 16 20:31:12 ubuntu ubiquity[2465]: log-output -t ubiquity debconf-copydb configdb targetdb -p ^oem-config/ --config=Name:targetdb --config=Driver:File --config=Mode:0644 --config=Filename:/target/var/cache/debconf/config.dat

Colin Watson (cjwatson) wrote :

Those debconf-related log messages are annoying but don't look particularly atypical to me.

I suspect that apt-clone is trying to repack giant .debs here; it will probably depend on what's installed on the system.

Colin Watson (cjwatson) wrote :

It seems to be trying to repack even the .debs that are already installed in the target system, which of course takes ages. This seems less than optimal. I'm not sure whether this is a bug in apt-clone or in how ubiquity is calling it.

Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in ubiquity (Ubuntu):
status: New → Confirmed
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