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Bug 1957805

Summary: [Hyper-V][RHEL9]Commits To Fix Kdump Failures
Product: Red Hat Enterprise Linux 9 Reporter: Joseph Salisbury <josalisb>
Component: kernelAssignee: Mohammed Gamal <mmorsy>
kernel sub component: Hyper-V QA Contact: HuijingHei <hhei>
Status: CLOSED NEXTRELEASE Docs Contact:
Severity: unspecified    
Priority: unspecified CC: cavery, hhei, huzhao, mmorsy, ribarry, virt-bugs, virt-maint, vkuznets, xuli, yacao, yuxisun
Version: 9.0Keywords: Triaged
Target Milestone: betaFlags: pm-rhel: mirror+
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: 1957803 Environment:
Last Closed: 2021-05-19 11:41:48 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Joseph Salisbury 2021-05-06 14:01:52 UTC 
+++ This bug was initially created as a clone of Bug #1957803 +++

Microsoft received a customer report of failures when trying to take a kdump. This issue was resolved by three small Linux kernel fixes.

Microsoft would like to request this following three commits in all supported releases.  We would like to get the fixes into a RHEL/CentOS 7.9 errata kernel since the problem was originally reported on RHEL/CentOS 7.x.

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/video/fbdev/hyperv_fb.c?id=aa5b7d11c7cb87c266d705b237368985e7171958

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/hv/channel_mgmt.c?id=77db0ec8b7764cb9b09b78066ebfd47b2c0c1909

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/hv/channel_mgmt.c?id=8c2d5e0640e53c14b6240e9bf1e32a2226e6e6ca

Patch #1 solves a problem where the “Unable to send packet via vmbus” message is output continuously. But with that problem fixed, the second problem can occur where the kdump kernel panics due to receiving an unexpected VMbus UNLOAD complete message.

Patch #2 prevents the UNLOAD complete message from ever occurring in the kdump kernel. But if the UNLOAD complete message does occur at some unexpected time, Patch #3 prevents it from causing a panic.
Comment 3 Mohammed Gamal 2021-05-19 11:41:48 UTC 
All patches are already included in CentOS Stream kernel. Closing as NEXTRELEASE