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Message #100417
[Bug 1359980] Re: [Hyper-V] Unable to perform a full kernel crash on Ubuntu 14.10
Fix for this needs to be decided by the kexec-tools team, moving over
there.
** Package changed: linux (Ubuntu) => kexec-tools (Ubuntu)
** Changed in: kexec-tools (Ubuntu)
Assignee: Andy Whitcroft (apw) => (unassigned)
** Changed in: kexec-tools (Ubuntu Utopic)
Assignee: Andy Whitcroft (apw) => (unassigned)
** Changed in: kexec-tools (Ubuntu)
Status: In Progress => New
** Changed in: kexec-tools (Ubuntu Utopic)
Status: In Progress => New
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https://bugs.launchpad.net/bugs/1359980
Title:
[Hyper-V] Unable to perform a full kernel crash on Ubuntu 14.10
Status in kexec-tools package in Ubuntu:
New
Status in kexec-tools source package in Utopic:
New
Bug description:
System details:
Linux ubuntu 3.16.0-9-generic #14-Ubuntu SMP Fri Aug 15 15:03:57 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
Ubuntu Server 14.10 Daily build from 19th Aug (first build picked up for testing)
We have followed the steps at
https://wiki.ubuntu.com/Kernel/CrashdumpRecipe to configure kdump on a
Generation 1 VM.
kdump is loaded and when we trigger the crash, a kernel panic is
displayed.
Issues:
1. The vmcore/crash file is not generated under /var/crash as configured in the kdump config.
2. The VM will hang and not reboot. Default action to take in case of a failure is to reboot - again as set in kdump config.
Repro rate: 100%
VM settings: tests ran with 1 CPU core or 4 cores.
Negociated VMBus is 3.0, which has been integrated since 14.04 so this should work as no other patches are needed. (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1317697)
I'm also attaching the serial console output of both cases - single
core and SMP.
root@ubuntu:~# kdump-config load
efi memory descriptor version 0 is not supported!
* loaded kdump kernel
root@ubuntu:~# cat /sys/kernel/kexec_crash_loaded
1
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References