SRU request submitted:
https://lists.ubuntu.com/archives/kernel-team/2017-October/087912.html
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New => In Progress
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)
** Also affects: linux (Ubuntu Zesty)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Zesty)
Status: New => In Progress
** Changed in: linux (Ubuntu Zesty)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Zesty)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)
** Description changed:
- Description:
+
+ == SRU Justification ==
Kernel crashes when installation of Ubuntu-16.04.3 with HWE (ISO).
- Same observation while booting to 4.10.0-28 HWE kerenl of Ubuntu-16.04.3 and
4.10.0-33 HWE as well.
-
+ Same observation while booting to 4.10.0-28 HWE kerenl of Ubuntu-16.04.3
+ and 4.10.0-33 HWE as well.
+
+ Seen only with 4.10 HWE kernels of Ubuntu-16.04.3. 4.4 kernels of
+ Ubuntu-16.04.3 works fine. Daily builds of Ubuntu Server 17.10 works fine.
+
+ Reducing the core count to <26 cores helps here. Boot & installation of
+ HWE-kernel works fine.
+
+ This bug was introduced by commit:
+ dc6db24d2476 ("x86/acpi: Set persistent cpuid <-> nodeid mapping when
booting")
+
+ It is resolved by reverting commit dc6db24d2476, which was done in mainline
by
+ commit c962cff17df as of v4.11-rc3.
+
+ There are three additiona commits introduced by the same patch author when
+ commit c962cff17df was submitted. However, it was confirmed that only the
single
+ revert is needed to fix this particular bug. Upstream thread:
+ https://lkml.org/lkml/2017/2/20/66
+
+ == Fix ==
+ commit c962cff17dfa11f4a8227ac16de2b28aea3312e4
+ Author: Dou Liyang <[email protected]>
+ Date: Fri Mar 3 16:02:23 2017 +0800
+
+ Revert "x86/acpi: Set persistent cpuid <-> nodeid mapping when
+ booting"
+
+ == Regression Potential ==
+ This is reverting a commit that introduced a bug. This commit has also
+ been reverted upstream.
+
+ == Test Case ==
+ A test kernel was built with this patch and tested by the original bug
reporter.
+ The bug reporter states the test kernel resolved the bug.
+
+
+
+
Setup:
Dell PowerEdge R940 having 2 socket populated with 28 cores.
-
+
Impact:
This is a boot and installation failure for R940 users having 2 socket x 28
cores.
Requesting an SRU for the fix.
-
+
Steps:
1. Setup a Dell PowerEdge R940 with 28 cores CPUs on 2 sockets.
2. Start installation of Ubuntu-16.04.3 with HWE kernel.
3. Observe the screen remains blank. Console logs indicate kernel crash.
-
+
Additional Info:
* Seen only with 4.10 HWE kernels of Ubuntu-16.04.3.
- 4.4 kernels of Ubuntu-16.04.3 works fine. Daily builds of Ubuntu Server
17.10 works fine.
-
- * Reducing the core count to <26 cores helps here. Boot & installation of
HWE-kernel works fine.
-
+ 4.4 kernels of Ubuntu-16.04.3 works fine. Daily builds of Ubuntu Server
17.10 works fine.
+
+ * Reducing the core count to <26 cores helps here. Boot & installation
+ of HWE-kernel works fine.
+
* Attaching the console log and acpidump from the setup.
-
+
* Patch causing this failure:
https://github.com/torvalds/linux/commit/dc6db24d2476cd09c0ecf2b8d80313539f737a89
x86/acpi: Set persistent cpuid <-> nodeid mapping when booting
-
-
+
* Fix patch series: https://lkml.org/lkml/2017/2/20/66
-
+
Revert "x86/acpi: Set persistent cpuid <-> nodeid mapping when booting"
https://github.com/torvalds/linux/commit/c962cff17dfa11f4a8227ac16de2b28aea3312e4#diff-6bd7ef719bca1a2a56b9ebf4bd0bd88d
-
+
Revert"x86/acpi: Enable MADT APIs to return disabled apicids"
https://github.com/torvalds/linux/commit/09c3f2bd5c7e5f18687663acb6adc6b167484ca5
-
+
acpi/processor: Implement DEVICE operator for processor enumeration
https://github.com/torvalds/linux/commit/8c8cb30f49b86333d8e036e1945cf1a78c03577e
-
+
acpi/processor: Check for duplicate processor ids at hotplug time
https://github.com/torvalds/linux/commit/a77d6cd968497792e072b74dff45b891ba778ddb
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https://bugs.launchpad.net/bugs/1719697
Title:
Boot/Installation crash of Ubuntu-16.04.3 HWE kernel on R940
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