Redhat 7.9 VM not working after latest update
Hello, I have a Redhat 7.9 VM on Windows 10 Hyper-V. It was fine, but after I applied the latest update, on boot the VM doesn't start. It shows a black screen with a some odd red symbol on the top, and it doesn't start. I attach the log file of the installation.
Any help would be appreciated.
Thanks, Marco
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Responses
Bug report filed:
https://bugzilla.redhat.com/show_bug.cgi?id=1941841
- Description of problem (copied from https://bugs.centos.org/view.php?id=18117):
After updating to kernel version 3.10.0-1160.21.1.el7.x86_64 on a Hyper-V (Windows 10) VM, the OS will not boot. There appear to be error messages output but the display is affected (squashed) and they are illegible. Selecting another kernel from the grub menu allows the OS to boot.
- The following patch seems to have caused the issue:
[Hyper-V][RHEL-7.9]video: hyperv_fb: Fix the cache type when mapping the VRAM Edit (BZ#1908896)
kernel commit: commit 5f1251a48c17b54939d7477305e39679a565382c Author: Dexuan Cui decui@microsoft.com Date: Tue Nov 17 16:03:05 2020 -0800
video: hyperv_fb: Fix the cache type when mapping the VRAM
- The issue has been fixed by:
Stable kernel commit: commit 452f087d2ff6decf298149e0bfd9fa5c212a636d Author: Dexuan Cui decui@microsoft.com Date: Sat Jan 9 14:53:58 2021 -0800
video: hyperv_fb: Fix the mmap() regression for v5.4.y and older
I've built a CentOSPlus kernel (kernel-plus) with the patch that is supposed to fix the problem. It is available from:
https://people.centos.org/toracat/kernel/7/bugs/18117/
Anyone affected by this problem is encouraged to give it a try. Feedback welcome.
All kernel-related bug reports automatically become inaccessible to the public. However if the issue has no security concern, it might be made public. So, let's ask Jamie. :)
I forgot to mention that the plus kernel was provided strictly for testing purposes. Any report with positive results may help accelerate the bug fix process, is my hope.