** Changed in: linux-azure (Ubuntu Jammy)
Status: Confirmed => Fix Committed
** Changed in: linux-azure (Ubuntu Lunar)
Status: Confirmed => Fix Committed
** Changed in: linux-azure (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2042568
Title:
Azure - Kernel crashes when removing gpu from pci
Status in linux-azure package in Ubuntu:
Invalid
Status in linux-azure source package in Jammy:
Fix Committed
Status in linux-azure source package in Lunar:
Fix Committed
Bug description:
[Description]
On a VM on Azure with a Tesla gpu it was noticed that when removing
the gpu from the pci the vm would crash. In case the nvidia drivers
are loaded, the machine won't crash. Instead the removing process will
hang and the machine will crash on reboot.
This is related to bug [1].
The bug reported in [1] regards another driver but the root cause is the same.
It is still investigated whether this is a bug in pci, or it is a bug of
various drivers on how they use pci.
For this case we have identified that removing commit [2] prevents the
kernel crashes.
Azure has requested to revert this commit, at least for the time being.
This commit is not in upstream, so it just need to be reverted from Ubuntu
kernels.
[Test Case]
On an Azure vm with a gpu :
# echo '1' > /sys/bus/pci/devices/0001:00:00.0/remove
where '0001:00:00.0' the pci address of the gpu.
The vm will crash.
[Where things could go wrong]
The commit to be reverted was included in a patchset to address lp
bugs https://bugs.launchpad.net/bugs/2023071 and
https://bugs.launchpad.net/bugs/2023594
However this commit just reduces boot time and removing shall not introduce
any regressions.
Side effects will be increase in the boot time.
[Other]
Only Ubuntu azure kernels are affected :
- Jammy 5.15
- Lunar 6.2
Focal is also affected since it's using 5.15 kernel.
This commit does not appear in Mantic 6.5 kernel.
[1] https://bugzilla.kernel.org/show_bug.cgi?id=215515
[2]
https://git.launchpad.net/~canonical-kernel/ubuntu/+source/linux-azure/+git/jammy/commit/?h=Ubuntu-azure-5.15.0-1043.50&id=75af0c10b3703400890d314d1d91d25294234a81
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