** Changed in: linux-azure (Ubuntu Focal)
Status: In Progress => Fix Committed
** Changed in: linux-azure (Ubuntu Jammy)
Status: In Progress => Fix Committed
** Changed in: linux-azure (Ubuntu Lunar)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/2023594
Title:
Case [Azure] Fix VM crash/hang issues due to fast VF add/remove
events
Status in linux-azure package in Ubuntu:
New
Status in linux-azure source package in Focal:
Fix Committed
Status in linux-azure source package in Jammy:
Fix Committed
Status in linux-azure source package in Lunar:
Fix Committed
Bug description:
SRU Justification
[Impact]
A Linux guest on Hyper-V/Azure can occasionally crash during early Linux
kernel boot due to a strange host behavior:
1. The host assigns a VF to the guest;
2. The host immediately unassigns the VF from the guest; //Dexuan: due to
some race conditions bug in Linux vPCI driver, Linux can crash.
3. The host assigns the VF to the guest again.
Starting late 2022 (around Nov 2022), Linux guests on Azure started to
crash more frequently due to a host side update at that time: a new
host/hypervisor feature of handling "correctable memory errors" can
cause a lot of successive VF remove/add events, so the race conditions
bug in Linux vPCI driver can surface much more easily. The Hyper-V
team is implementing a batching mechanism so that the guest will get
much less VF remove/add events (ETA: June 2023), but meanwhile we
should also get the Linux race condition bugs fixed so that Linux
guests won't crash even if it receives the successive VF remove/add
events.
[Test Plan]
Microsoft tested
[Regression potential]
PCI devices may not get registered, or VMs may crash.
[Other Info]
SF: #00349076
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