** Changed in: linux-azure (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1904632
Title:
Ubuntu 18.04 Azure VM host kernel panic
Status in l
Sure, will do. But AFAICT, there is no ETA yet. Even if the fix was made
today, it would take quite some time (at least a few months?) to deploy
the fix to the whole Azure fleet. :-(
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Yes, I am clear on this Dexuan. Had found the same info tonight,
including the table of causes of VM exit. The issue is not the VM exit
itself, it is that hyperv adversely affects the 32 bit programs state.
Please keep posting the progress on fixing the issue if you could as
this goes along.
Regar
VM exits are pretty frequent and normal. "VM exits occur in response to certain
instructions and events in VMX non-root operation" (see CHAPTER 27
VM EXITS of
https://software.intel.com/content/www/us/en/develop/download/intel-64-and-ia-32-architectures-sdm-volume-3c-system-programming-guide-part
Thanks Dexuan. I realized later and clarified my Q on the thread,
suggesting the experiment I mentioned. I have not tried it, but anyway
you guys are now zeroing in on the issue.
On Wednesday, December 16, 2020, 6:30:48 PM PST, Dexuan Cui
<1904...@bugs.launchpad.net> wrote:
VM Exit is a
Hi Dexuan,
To clarify my question: What is the cause of the VMexit (ie. trap to the
hyperv) in this scenario?
It might be worth it to do an experiment and reverse the order of
operations i.e. first start the hello program in a loop and THEN start
the nested VM via KVM. Then it would be the nested
VM Exit is a term in the Intel CPU's Virtualization support (VMX). It
means the execution of the guest CPU is interrupted and the execution
"jumps" to some function in the hypervisor; the hypervisor analyzes the
reason of the VM Exit, and handles the VM exit properly, and then the
execution "jumps"
Thank you Dexuan. What does VMexit mean here please? Trying to see how
the VM exit triggers a kernel panic, since we were just running a 32 bit
hello world program, which should not cause a the host VM to "exit".
Regards.
On Wednesday, December 16, 2020, 5:11:37 PM PST, Dexuan Cui
<1904...@b
Hyper-V team just identified a bug where the Hyper-V hypervisor can
truncate the host SYSENTER_ESP/EIP to 16 bits on VMexit for some reason.
A further investigation is ongoing.
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Hi Marcelo,
This issue can also been seen on the latest Ubuntu 18.04 image. It is also seen
in the 5.10-rc7 Linux kernel as well as 5.4.
The issue can be reproduced 100% of the time using a more simple setup as
described below. A basic "hello world" C program compiled for 32 bit crashes
the Az
Thanks for reporting the issue, Kaveh.
Do you have more information about the image you are using to create
this Azure host? By your last comment, it doesn't seem the host is
running one of the Ubuntu kernels.
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Version info about the Azure Ubuntu Host VM:
root@vm-5:~# uname -a
Linux vm-5 4.15.18+test #1 SMP Mon Oct 29 03:40:39 UTC 2018 x86_64 x86_64
x86_64 GNU/Linux
root@vm-5:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:Ubuntu 18.04.5 LTS
Release:18.04
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