Public bug reported:

== Comment: #7 - Guilherme Guaglianoni Piccoli <gpicc...@br.ibm.com> - 
2016-08-19 10:08:07 ==
The normal procedure to perform a Netboot installation of Ubuntu 16.04 is to 
download the latest vmlinux and initrd.gz files available, and kexec them with 
no parameters (at least in ppc64el).

We're experiencing a strange issue in which the installer freezes before
menus are showed. The system hangs in the point specified below, right
after the i40e driver initialization:

[   11.052832] i40e 0002:01:00.0 enP2p1s0f0: renamed from eth0
[   11.073976] i40e 0002:01:00.1 enP2p1s0f1: renamed from eth1
[   11.117799] i40e 0002:01:00.2 enP2p1s0f2: renamed from eth2
[   11.225745] i40e 0002:01:00.3 enP2p1s0f3: renamed from eth3
***HANG***

The most difficult part in this issue is that it seems to be a timing
issue/race condition, and many debug trials end up by avoiding the issue
reproduction (heisenbug).

We were successful though in getting logs by booting the kernel with the
command-line "BOOT_DEBUG=2" and by changing the initrd in order to
enable systemd debug; only the files "init" and "start-udev" were
changed in initrd, both attached here.

We've attached here a saved screen session that shows the entire boot
process until it gets flooded with lots of messages like:


"starting '/bin/readlink /etc/udev/rules.d/80-net-setup-link.rules'
'/bin/readlink /etc/udev/rules.d/80-net-setup-link.rules'(err) 'failed to 
execute '/bin/readlink' '/bin/readlink /etc/
udev/rules.d/80-net-setup-link.rules': No such file or directory'

seq 3244 queued, 'add' 'pci_bus'
starting '/bin/readlink /etc/udev/rules.d/80-net-setup-link.rules'
passed 408 byte device to netlink monitor 0x1003cfe8020seq 3236 
running'/bin/readlink /etc/udev/rules.d/80-net-setup-l
ink.rules'(err) 'failed to execute '/bin/readlink' '/bin/readlink 
/etc/udev/rules.d/80-net-setup-link.rules': No such
file or directory'
'/bin/readlink /etc/udev/rules.d/80-net-setup-link.rules'(err) 'failed to 
execute '/bin/readlink' '/bin/readlink /etc/
udev/rules.d/80-net-setup-link.rules': No such file or directory'
Process '/bin/readlink /etc/udev/rules.d/80-net-setup-link.rules' failed with 
exit code 2.
PROGRAM '/bin/readlink /etc/udev/rules.d/80-net-setup-link.rules' 
/lib/udev/rules.d/73-usb-net-by-mac.rules:6
passed device to netlink monitor 0x1003d01f730
"


Then it keeps hanged in this stage. We re-tested it by changing the file 
73-usb-net-by-mac.rules in initrd, replacing " 
/etc/udev/rules.d/80-net-setup-link.rules" to  
"/lib/udev/rules.d/80-net-setup-link.rules", since the former does not exist 
whereas the latter does. Same issue were observed!

Notice that if we boot the installer with command-line "net.ifnames=0"
or "net.ifnames=1", the problem does not reproduces anymore.

We want to ask Canonical's help in investigating this issue.
Thanks,


Guilherme

== Comment: #8 - Guilherme Guaglianoni Piccoli <gpicc...@br.ibm.com> -
2016-08-19 10:09:51 ==


== Comment: #9 - Guilherme Guaglianoni Piccoli <gpicc...@br.ibm.com> - 
2016-08-19 10:10:31 ==


== Comment: #10 - Guilherme Guaglianoni Piccoli <gpicc...@br.ibm.com> - 
2016-08-19 10:11:49 ==

** Affects: systemd (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: New


** Tags: architecture-ppc64le bugnameltc-145180 severity-high 
targetmilestone-inin16041

** Tags added: architecture-ppc64le bugnameltc-145180 severity-high
targetmilestone-inin16041

-- 
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1615021

Title:
  Unable to network boot Ubuntu 16.04 installer normally on Briggs

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1615021/+subscriptions

-- 
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs

Reply via email to