Kernel panic with ulatencyd on kernel 3.2.0-29-generic

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

Also having trouble after installing 3.2.0-29 (not low latency, just the normal one). Something is not right. It failed during the install from 3.2.0-27 and told me that something was broken. I noticed that the Network Manager icon was grayed out after the kernel install. I reverted back to 3.2.0-27 and the Network Manager icon returned to normal. I uninstalled 3.2.0-29 and will wait until it's fixed.

It seems that it aslo prevent to install the guest additions for virtualbox.
The compilation is fine, but when you reboot your computer twice, the
boot process fails.

Removing ulatencyd fixes that.

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

Is this still valid? / Why haven't anyone fixed this yet?

Does this happen with 12.10's kernel? If it doesn't, it might be worth considering to up the kernel.

Yes - I can confirm that this bug still happen in 12.10.

Still happens in generic x86-64 kernel, version 3.2.0.34.37

Screenshot of the lockup on boot: http://ompldr.org/vZ2p1Zg
(though it won't be particularly useful since a log is already attached)

I'd like to perform a kernel bisect to identify what commit caused this regression. It sounds like this regression was introduced in 3.2.0-29.46, so I will bisect between 3.2.0-28.45 and 3.2.0-29.46.

I'm going to first see if I can reproduce this bug. If I can, I can perform the bisect and testing. Is installing the ulatencyd package all that is required, or do I need to do some configuring of ulatencyd?

This bug may be related to commit ffaf6a1e73719e0250fce7b52015187180a77fe9 . In parallel with bisecting, I'm going to build a test kernel with that commit reverted. I'll post a link to that test kernel shortly.

I created a Precise test kernel with commit ffaf6a1e73719e0250fce7b52015187180a77fe9 reverted.

The test kernel can be downloaded from:
http://people.canonical.com/~jsalisbury/lp1034099/

Can folks affected by this bug test that kernel and report back if it still exhibits this bug?

Thanks in advance!

Hi,

I have just tested the proposed kernel 3.2.0-34-generic #53~lp1034099v1.
I can confirm that it works correctly with ulatencyd installed.
No crash or any other missbehaviour.
Great Job !!!

Kind regards

Artur

It would be good if other folks affected by this bug can also test the kernel posted in comment #11.

Also, has anyone tested with the latest Raring kernel[0]?

[0] https://launchpad.net/ubuntu/+source/linux/3.7.0-4.12

I created another test kernel with the following commit reverted:
800d4d30c8f20bd728e5741a3b77c4859a613f7c

This test kernel does not have commit ffaf6a1e73719e0250fce7b52015187180a77fe9 reverted.

Reverting commit 800d4d30c8f20bd728e5741a3b77c4859a613f7c is what is done in a fix that is getting queued up in upstream stable. The upstream commit SHA1 is: fd8ef11730f1d03d5d6555aa53126e9e34f52f12

It would be great if folks affected by this bug can test this new kernel. The kernel can be downloaded from:

http://people.canonical.com/~jsalisbury/lp1034099/

I can confirm that the new kernel - 3.2.0-34.53~lp1034099v2_all.deb - doesn't suffer from this bug.

This bug will be fixed when upstream commit fd8ef11 is applied to upstream stable v3.2. I see that it has already been applied to upstream v3.0, v3.4, and v3.6.

I'll monitor stable-queue and update the bug when the fix lands in 3.2.

I will also submit an SRU request for Quantal.

I have experienced this bug today. Installing ulatencyd renders an unbootable system (because it causes kernel panic). Uninstalling it solves the problem.

cat /etc/lsb-release
-------------------------
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=13.10
DISTRIB_CODENAME=saucy
DISTRIB_DESCRIPTION="Ubuntu 13.10"

uname -a
-----------
Linux ... 3.11.0-18-generic #32-Ubuntu SMP Tue Feb 18 21:11:14 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

aptitude show ulatencyd
-------------------------------
Package: ulatencyd
Version: 0.5.0-8
Section: universe/utils
Maintainer: Ubuntu Developers <email address hidden>
Architecture: amd64
Uncompressed Size: 403 k
Depends: libc6 (>= 2.17), libdbus-1-3 (>= 1.0.2), libdbus-glib-1-2 (>= 0.78), libglib2.0-0 (>= 2.22.0), liblua5.1-0, libpolkit-gobject-1-0 (>= 0.99), libxcb1, dbus,
         lua5.1 | lua, lua-posix
PreDepends: dpkg (>= 1.15.7.2)
Recommends: consolekit
Conflicts: ulatencyd