Ubuntu14.04.1 kernel panics with enic driver throwing a NULL Pointer exception

[Srinivas]

Steps to reproduce the bug:
1. Install Ubuntu 14.04.1 on the Cisco M-series server.
2. Run reboot test, OS will come up and go for graceful reboot continuously.
3. I am seeing kernel panic in 3 out of 4 Ubuntu machines . Don't know after how many iterations of reboot it happened. I checked the server 6 hours after starting the reboot test.
4. Don't know whether this panic is happening while the OS was booting or while going for reboot.

The bug has been root caused to the enic driver and a fix has been posted upstream.
Please find below the details of the patch submitted upstream.

4cfe878537cec0e9c0f84b93cc6aa9526f6942b5 enic: do tx cleanup in napi poll.

This bug is submitted for the patch to be pulled in from upstream to Ubuntu's releases.

===
break-fix: - 4cfe878537cec0e9c0f84b93cc6aa9526f6942b5

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1438039

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Srinivas (srinira)]

I am unable to get the logs from the machine.

BTW, the bug is already fixed and the patch is committed upstream. The details of which has been mentioned in the description.

[Srinivas (srinira)]

Any update on the patch being pulled?

[Joseph Salisbury (jsalisbury)]

I tried to perform a cherry-pick of 4cfe87853. However, it looks like it will also need the following commits backported or cherry-picked:

7c2ce6e
b6e97c1
a145df2
8e09134
14747cd
4cfe8785

I'll try to build a test kernel with these commits, but it may be too many changes for an SRU.

In the mean time, can you test the LTS-backport-vivid kernel for Trusty? This is the kernel that comes with 14.04.3. It can be install with:

sudo apt-get install linux-generic-lts-vivid

[Rolf Leggewie (r0lf)]

utopic has seen the end of its life and is no longer receiving any updates. Marking the utopic task for this ticket as "Won't Fix".