pvops NULL pointer dereference oops in latest precise kernel

Steps to reproduce:
* Install fresh Precise machine
* Follow instructions on http://wiki.xen.org/wiki/XAPI_on_Ubuntu to install XCP
* Reboot machine

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

apport-collect 974982

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

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

Machine can not boot due to this issue.

Problem was introduced in 3.2.14 by commit "x86/ioapic: Add register level checks to detect bogus io-apic entries" (73d63d038ee9f769f5e5b46792d227fe20e442c5)

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However, given the number of bugs that the Kernel Team receives during any development cycle it is impossible for us to review them all. Therefore, we occasionally resort to using automated bots to request further testing. This is such a request.

We have noted that there is a newer version of the development kernel than the one you last tested when this issue was found. Please test again with the newer kernel and indicate in the bug if this issue still exists or not.

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Problem occurred with 3.2.0-22.35

Forgot to change status

I'll build a precise test kernel with that commit reverted and post a link to it shortly.

@Jan

I built a Precise test kernel with the following commit reverted:
73d63d038ee9f769f5e5b46792d227fe20e442c5

The test kernel can be downloaded from:
http://people.canonical.com/~jsalisbury/lp974982/

Can you test that kernel and report back if it fixes this bug?

Hrm, looks like there was some confusion and discusson upstream regarding this commit and it seems like it should not have been applied to upstream stable v3.2.y:

http://<email address hidden>/msg04782.html

Jan, if we could get feedback from the test kernel Joseph created that would be great. Thanks.

Sorry for the delay guys, I was out for a long weekend

Just tried Joseph's kernel and the machine boots correctly

Btw thanks for the quick support

This bug was fixed in the package linux - 3.2.0-23.36

---------------
linux (3.2.0-23.36) precise-proposed; urgency=low

  [ Andy Whitcroft ]

  * tools/hv: add basic Makefile
    - LP: #977246
  * tools/hv: add basic manual pages
    - LP: #977246
  * Hyper-V KVP daemon -- add to the tools package
    - LP: #977246

  [ David Henningsson ]

  * SAUCE: (drop after 3.3) ALSA: HDA: Remove quirk for Gigabyte
    GA-H61M-S2PV
    - LP: #948360

  [ Leann Ogasawara ]

  * d-i: Add dm-mirror and dm-raid to md-modules
    - LP: #919281

  [ Tim Gardner ]

  * [Config] Fix invalid linux-headers link
    - LP: #974403
  * Remove headers asm symlink entirely
    - LP: #974403

  [ Upstream Kernel Changes ]

  * Revert "x86/ioapic: Add register level checks to detect bogus io-apic
    entries"
    - LP: #974982
  * ALSA: HDA: Realtek: Take vmaster dac from multiout dac list
    - LP: #974090
  * kexec: remove KMSG_DUMP_KEXEC
    - LP: #944772
  * kmsg_dump: don't run on non-error paths by default
    - LP: #944772
  * pstore: Introduce get_reason_str() to pstore
    - LP: #944772
 -- Leann Ogasawara <email address hidden> Tue, 10 Apr 2012 08:16:09 -0700