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** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: disco
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https://bugs.launchpad.net/bugs/1829652
Title:
Kernel panic upon resetting ixgbe SR-IOV VFIO virtual function using
5.0 kernel
Status in linux package in Ubuntu:
Incomplete
Bug description:
Hi,
I've recently upgraded my system to ubuntu 19.04, and kernel consistently
panics when I boot a virtual machine using an SR-IOV VFIO virtual function.
Could reproduce with 5.0.0-13-generic and 5.0.0-15-generic, doesn't happen with
4.18.0-20-generic.
I'm using libvirt and VM is using KVM, XML snippet to delegate virtual
function to VM is:
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x05' slot='0x10' function='0x0'/>
</source>
<alias name='hostdev0'/>
<address type='pci' domain='0x0000' bus='0x03' slot='0x00'
function='0x0'/>
</hostdev>
As soon as I start the VM using "virsh start vm", kernel panics.
I'm using X550T intel NIC (lspci output: Ethernet controller: Intel
Corporation Ethernet Controller 10G X550T (rev 01)) on a Supermicro
X11SSH-CTF motherboard, with up to date bios and 4 virtual functions
(class/net/em1/device/sriov_numvfs = 4).
Given panic stack trace (see attachment), I've narrowed down the bug
to ixgbe_ipsec_vf_clear function in upstream ixgbe driver:
https://github.com/torvalds/linux/blob/72cf0b07418a9c8349aa9137194b1ccba6e54a9d/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c#L840
When I comment its usage
(https://github.com/torvalds/linux/blob/72cf0b07418a9c8349aa9137194b1ccba6e54a9d/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c#L734),
everything works as expected (I'm not using any ipsec feature). Didn't
try to fix the ixgbe_ipsec_vf_clear function though.
Please find attached a stack trace collected using IPMI serial-over-
lan.
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