** Changed in: linux-azure (Ubuntu Focal)
Status: In Progress => Fix Committed
** Changed in: linux-azure-4.15 (Ubuntu Bionic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1895527
Title:
[linux-azure] [SRU] UBUNTU: SAUCE: Drivers: hv: vmbus: Add timeout to
vmbus_wait_for_unload
Status in linux-azure package in Ubuntu:
In Progress
Status in linux-azure-4.15 package in Ubuntu:
Invalid
Status in linux-azure source package in Bionic:
Invalid
Status in linux-azure-4.15 source package in Bionic:
Fix Committed
Status in linux-azure source package in Focal:
Fix Committed
Status in linux-azure-4.15 source package in Focal:
Invalid
Status in linux-azure source package in Groovy:
In Progress
Status in linux-azure-4.15 source package in Groovy:
Invalid
Bug description:
[Impact]
This is a request to inclue a patch, submitted to the upstream linux-
hyperv mailing list, in the linux-azure kernels.
Microsoft would like to request this patch in the 16.04 (4.15) and
newer azure kernels. This patch fixes a prior commit, hence the SRU
request:
Fixes: 415719160de3 ("Drivers: hv: vmbus: avoid scheduling in
interrupt context in vmbus_initiate_unload()")
The patch specfically performs the following:
"vmbus_wait_for_unload() looks for a CHANNELMSG_UNLOAD_RESPONSE
message coming from Hyper-V. But if the message isn't found for some
reason, the panic path gets hung forever. Add a timeout of 10 seconds
to prevent this."
The requested patch can be found at:
https://lkml.org/lkml/2020/9/13/196
[Test Case]
Since the problem depends on a communication failure with the host. I
recommend testing for regressions. The change affects when the module
is removed or the system is suspended.
[Regression Potential]
The change affects the panic path and suspend so any regressions
shouldn't be critical.
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