| 2012-02-10 01:59:49 |
Matt Wilson |
bug |
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added bug |
| 2012-02-10 02:00:31 |
Matt Wilson |
bug |
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added subscriber JC Lima |
| 2012-02-10 02:01:22 |
Matt Wilson |
bug |
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added subscriber Doug Mitchell |
| 2012-02-10 02:04:24 |
Matt Wilson |
attachment added |
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stack traces from instance running 2.6.32-341 (1/2) https://bugs.launchpad.net/ubuntu/+source/linux-ec2/+bug/929941/+attachment/2728701/+files/ubuntu-deadlock-2.6.32-341-1.txt |
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| 2012-02-10 02:05:04 |
Matt Wilson |
attachment added |
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stack traces from instance running 2.6.32-341 (2/2) https://bugs.launchpad.net/ubuntu/+source/linux-ec2/+bug/929941/+attachment/2728702/+files/ubuntu-deadlock-2.6.32-341-2.txt |
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| 2012-02-10 02:06:03 |
Matt Wilson |
attachment added |
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stack traces from instance running 2.6.32-342 (1/1) https://bugs.launchpad.net/ubuntu/+source/linux-ec2/+bug/929941/+attachment/2728703/+files/ubuntu-deadlock-2.6.32-342-1.txt |
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| 2012-02-10 02:07:06 |
Matt Wilson |
visibility |
public |
private |
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| 2012-02-10 05:41:13 |
Matt Wilson |
bug |
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added subscriber Heroku |
| 2012-02-10 05:41:26 |
Matt Wilson |
bug |
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added subscriber Will Leinweber |
| 2012-02-10 19:04:19 |
Noah Zoschke |
bug |
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added subscriber Noah Zoschke |
| 2012-02-10 19:33:42 |
Scott Moser |
visibility |
private |
public |
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| 2012-02-10 19:33:50 |
Scott Moser |
bug |
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added subscriber Stefan Bader |
| 2012-02-10 19:33:56 |
Scott Moser |
bug |
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added subscriber Ben Howard |
| 2012-02-10 19:38:03 |
Matt Wilson |
attachment added |
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stack traces from instance running 2.6.32-316 https://bugs.launchpad.net/ubuntu/+source/linux-ec2/+bug/929941/+attachment/2730182/+files/i-804475e2.txt |
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| 2012-02-13 10:32:23 |
Stefan Bader |
linux-ec2 (Ubuntu): importance |
Undecided |
High |
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| 2012-02-13 10:32:23 |
Stefan Bader |
linux-ec2 (Ubuntu): status |
New |
Incomplete |
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| 2012-02-13 10:32:23 |
Stefan Bader |
linux-ec2 (Ubuntu): assignee |
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Stefan Bader (stefan-bader-canonical) |
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| 2012-02-13 18:22:07 |
Matt Wilson |
summary |
Kernel deadlock in scheduler on m2.2xlarge EC2 instance |
Kernel deadlock in scheduler on m2.{2,4}xlarge EC2 instance |
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| 2012-02-13 18:24:14 |
Matt Wilson |
attachment added |
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/proc/interrupts as an attachment https://bugs.launchpad.net/ubuntu/+source/linux-ec2/+bug/929941/+attachment/2736482/+files/proc-interrupts.txt |
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| 2012-03-12 20:35:58 |
Matt Wilson |
summary |
Kernel deadlock in scheduler on m2.{2,4}xlarge EC2 instance |
Kernel deadlock in scheduler on multiple EC2 instance types |
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| 2012-03-13 02:37:02 |
Ilan |
bug |
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added subscriber Ilan |
| 2012-05-09 22:45:33 |
Fabio Kung |
bug |
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added subscriber Fabio Kung |
| 2012-06-12 00:24:36 |
Cristian Gafton |
bug |
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added subscriber Cristian Gafton |
| 2012-06-12 21:56:47 |
Simon Kuhn |
bug |
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added subscriber Simon Kuhn |
| 2012-06-20 14:16:27 |
Todd |
bug |
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added subscriber Todd |
| 2012-06-25 09:22:21 |
Stefan Bader |
linux-ec2 (Ubuntu): status |
Incomplete |
In Progress |
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| 2012-06-25 09:29:10 |
Stefan Bader |
description |
After running for some indeterminate period of time, the 2.6.32-341-ec2 and 2.6.32-342-ec2 kernels stop responding when running on m2.2xlarge EC2 instances. No console output is emitted. Stack dumps gathered by examining CPU context information show that all VCPUs are stuck waiting on spinlocks. This could be a deadlock in the scheduling code.
ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: linux-image-2.6.32-341-ec2 2.6.32-341.42
ProcVersionSignature: User Name 2.6.32-341.42-ec2 2.6.32.49+drm33.21
Uname: Linux 2.6.32-341-ec2 x86_64
Architecture: amd64
Date: Fri Feb 10 01:56:17 2012
Ec2AMI: ami-55dc0b3c
Ec2AMIManifest: (unknown)
Ec2AvailabilityZone: us-east-1c
Ec2InstanceType: m1.xlarge
Ec2Kernel: aki-427d952b
Ec2Ramdisk: unavailable
ProcEnviron:
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: linux-ec2 |
SRU Justification:
Impact: The version of Xen patches we currently use for the ec2 kernel have a serious flaw in the handling of nested spinlocks. This can result in a complete deadlock under certain workloads.
Fix: The spinlock handling code has been substantially restructured in later versions of the patchset. The changes backport this but also enable the use of ticket-spinlocks (as we do now) when compiling with the compatibility level we use.
Testcase: Not easy to reproduce. But feedback with the patchset applied (see comment #32) look good.
--
After running for some indeterminate period of time, the 2.6.32-341-ec2 and 2.6.32-342-ec2 kernels stop responding when running on m2.2xlarge EC2 instances. No console output is emitted. Stack dumps gathered by examining CPU context information show that all VCPUs are stuck waiting on spinlocks. This could be a deadlock in the scheduling code.
ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: linux-image-2.6.32-341-ec2 2.6.32-341.42
ProcVersionSignature: User Name 2.6.32-341.42-ec2 2.6.32.49+drm33.21
Uname: Linux 2.6.32-341-ec2 x86_64
Architecture: amd64
Date: Fri Feb 10 01:56:17 2012
Ec2AMI: ami-55dc0b3c
Ec2AMIManifest: (unknown)
Ec2AvailabilityZone: us-east-1c
Ec2InstanceType: m1.xlarge
Ec2Kernel: aki-427d952b
Ec2Ramdisk: unavailable
ProcEnviron:
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: linux-ec2 |
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| 2012-06-25 09:29:22 |
Stefan Bader |
bug |
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added subscriber Ubuntu Stable Release Updates Team |
| 2012-06-25 15:49:55 |
Stefan Bader |
linux-ec2 (Ubuntu): status |
In Progress |
Fix Committed |
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| 2012-06-27 23:44:53 |
Matt Zimmerman |
bug |
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added subscriber Matt Zimmerman |
| 2012-07-07 22:38:06 |
Launchpad Janitor |
branch linked |
|
lp:ubuntu/lucid-proposed/linux-ec2 |
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| 2012-07-09 11:38:04 |
Luis Henriques |
tags |
amd64 apport-bug ec2-images lucid |
amd64 apport-bug ec2-images lucid verification-needed-lucid |
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| 2012-07-10 17:44:35 |
Stefan Bader |
tags |
amd64 apport-bug ec2-images lucid verification-needed-lucid |
amd64 apport-bug ec2-images lucid verification-done-lucid |
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| 2012-07-23 17:22:10 |
Launchpad Janitor |
linux-ec2 (Ubuntu): status |
Fix Committed |
Fix Released |
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