Ubuntu
ubuntu-release-upgrader package

  1. Bug #1511875
  2. Comment #0

Comment 0 for bug 1511875

Revision history for this message
MegaBrutal (qbu6to) wrote :

When I try to upgrade from 15.10 Wily to 16.04 Xenial (actual development version) within an LXC container, the upgrade script hangs at the message „Calculating the changes”.

Steps to reproduce:
1. Make an LXC container with Wily (quickest option is to use lxc-create -t download, choose ubuntu, wily, amd64/i386).
2. Boot up the container, log in, „apt-get -y install ubuntu-release-upgrader”.
3. Start the upgrade with „do-release-upgrade -d”.

You will see that the upgrade process will hang at the message „Calculating the changes”.

The process which hangs: „/usr/bin/python3 /tmp/ubuntu-release-upgrader-1mpotr5d/xenial --mode=server --frontend=DistUpgradeViewText --devel-release”

With strace, it is revealed that the process hangs at a „futex” system call:
futex(0x7f4190000c10, FUTEX_WAIT_PRIVATE, 0, NULL

This system call never returns, the process must be interrupted with CTRL-C or kill.

Upgrading to any previous release within an LXC container works without problems, therefore I consider it as a regression.