linux-kernel - Re: BUG: Virtual machine fails to start on 6.0-rc2

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Date:   Thu, 25 Aug 2022 18:08:07 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     "Laba, SlawomirX" <slawomirx.laba@...el.com>
Cc:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "songmuchun@...edance.com" <songmuchun@...edance.com>,
        "mike.kravetz@...cle.com" <mike.kravetz@...cle.com>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: BUG: Virtual machine fails to start on 6.0-rc2

On Thu, 25 Aug 2022 23:42:47 +0000
"Laba, SlawomirX" <slawomirx.laba@...el.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@...alhost sl]# uname -r
> 6.0.0-rc2-00159-g4c612826bec1
> [root@...alhost sl]# echo 1 >
> /sys/class/net/ens785f3/device/sriov_numvfs [root@...alhost sl]#
> virsh start rhel_9_0_first ^C
> [root@...alhost 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)
>