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SubjectRe: BUG: Virtual machine fails to start on 6.0-rc2
On Thu, 25 Aug 2022 23:42:47 +0000
"Laba, SlawomirX" <slawomirx.laba@intel.com> wrote:

> We were testing the changes for our VF devices and noticed an issue
> when starting VMs with passthrough VFs. We then moved back to
> mainline kernel and reproduced the issue on 6.0-rc2
>
> We noticed that the startup of the KVM hangs.
>
> Steps to reproduce:
> Create a VF from the PF interface.
> Configure VM XML with the VF PCI.
> Start the KVM.
>
> To isolate the issue we moved back to kernel 5.19 and it was working
> fine.
>
> Working tag v5.19
> Tested failing commit 4c612826bec1

Does this resolve the issue?

https://lore.kernel.org/all/166015037385.760108.16881097713975517242.stgit@omen/

This is currently in Andrew's mm-hotfixes-unstable branch and we're
waiting for it to be merged to mainline. Thanks,

Alex

> [root@localhost sl]# uname -r
> 6.0.0-rc2-00159-g4c612826bec1
> [root@localhost sl]# echo 1 >
> /sys/class/net/ens785f3/device/sriov_numvfs [root@localhost sl]#
> virsh start rhel_9_0_first ^C
> [root@localhost sl]# virsh list --all
> Id Name State
> -------------------------------
> 1 rhel_9_0_first paused
>
> Dmesg:
> [ +0.042400] iavf: Intel(R) Ethernet Adaptive Virtual Function
> Network Driver [ +0.000004] Copyright (c) 2013 - 2018 Intel
> Corporation. [ +0.000309] iavf 0000:18:19.0: enabling device (0000
> -> 0002) [ +0.073471] iavf 0000:18:19.0: Invalid MAC address
> 00:00:00:00:00:00, using random [ +0.000674] iavf 0000:18:19.0:
> Multiqueue Enabled: Queue pair count = 16 [ +0.000466] iavf
> 0000:18:19.0: MAC address: 5a:0c:b5:f7:4f:0b [ +0.000003] iavf
> 0000:18:19.0: GRO is enabled [ +0.005941] iavf 0000:18:19.0
> ens785f3v0: renamed from eth0 [ +0.179174] IPv6:
> ADDRCONF(NETDEV_CHANGE): ens785f3v0: link becomes ready [ +0.000040]
> iavf 0000:18:19.0 ens785f3v0: NIC Link is Up Speed is 25 Gbps Full
> Duplex [ +26.408503] bridge: filtering via arp/ip/ip6tables is no
> longer available by default. Update your scripts to load br_netfilter
> if you need this. [ +0.399621] VFIO - User Level meta-driver
> version: 0.3 [ +0.151579] iavf 0000:18:19.0: Remove device [
> +0.292158] ice 0000:18:00.3 ens785f3: Setting MAC 52:54:00:9f:ea:de
> on VF 0. VF driver will be reinitialized [ +0.083676] ice
> 0000:18:00.3: Clearing port VLAN on VF 0 [ +0.155905] tun: Universal
> TUN/TAP device driver, 1.6 [ +0.000976] virbr0: port 1(vnet0)
> entered blocking state [ +0.000017] virbr0: port 1(vnet0) entered
> disabled state [ +0.000052] device vnet0 entered promiscuous mode [
> +0.000244] virbr0: port 1(vnet0) entered blocking state [ +0.000003]
> virbr0: port 1(vnet0) entered listening state [ +2.019924] virbr0:
> port 1(vnet0) entered learning state [ +2.047997] virbr0: port
> 1(vnet0) entered forwarding state [ +0.000018] virbr0: topology
> change detected, propagating [Aug25 19:12] INFO: task khugepaged:507
> blocked for more than 122 seconds. [ +0.000016] Tainted: G
> W I 6.0.0-rc2-00159-g4c612826bec1 #1 [ +0.000010] "echo 0
> > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [
> > +0.000010] task:khugepaged state:D stack: 0 pid: 507 ppid:
> > 2 flags:0x00004000 [ +0.000004] Call Trace:
> [ +0.000001] <TASK>
> [ +0.000003] __schedule+0x1bc/0x550
> [ +0.000006] ? osq_unlock+0xf/0x90
> [ +0.000005] schedule+0x5d/0xd0
> [ +0.000002] rwsem_down_write_slowpath+0x2c9/0x5e0
> [ +0.000004] ? find_vma+0x64/0x70
> [ +0.000004] collapse_huge_page+0x1f8/0x8a0
> [ +0.000004] ? _raw_spin_unlock+0x14/0x30
> [ +0.000002] ? preempt_count_add+0x70/0xa0
> [ +0.000005] ? _raw_spin_lock_irqsave+0x21/0x30
> [ +0.000001] ? lock_timer_base+0x61/0x80
> [ +0.000005] khugepaged_scan_pmd+0x33d/0x7b0
> [ +0.000003] khugepaged_scan_mm_slot+0x155/0x440
> [ +0.000003] khugepaged+0x189/0x3e0
> [ +0.000002] ? preempt_count_add+0x70/0xa0
> [ +0.000002] ? _raw_spin_unlock_irqrestore+0x1e/0x40
> [ +0.000002] ? khugepaged_scan_mm_slot+0x440/0x440
> [ +0.000001] kthread+0xf0/0x120
> [ +0.000003] ? kthread_complete_and_exit+0x20/0x20
> [ +0.000003] ret_from_fork+0x1f/0x30
> [ +0.000006] </TASK>
>
> On the working version there is a line that enables the interface for
> the VF which is missing on non-working one: [ +0.911730] vfio-pci
> 0000:18:19.0: enabling device (0000 -> 0002)
>

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