Virt-manager with kernel 6.16.8-1-MANJARO: journal reports 'BUG: kernel NULL pointer dereference'

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1

This post is only to share experience regarding a compatibility issue between kernel version 6.16.8-1-MANJARO and Virt-Manager.

After many hours spent trying to get Virt-Manager to work with kernel 6.16.8-1-MANJARO on my laptop, I tried the same on another manjaro partition and everything worked fine. The journal no longer reports kernel bug.

The only noticeable difference between both partitions was the kernel version (6.15.11-2-MANJARO worked fine, as did the latest LTS release 6.12.48-1-MANJARO that I tried later).

I then changed the kernel version of the failing partition (and nothing else) to match the version above, which fixed the issue I was facing.

Here is the kernel error reported by 6.16.8-1-MANJARO:

Oct 01 19:40:37 herezilo NetworkManager[944]: <info>  [1759340437.7977] device (virbr0): state change: ip-check -> secondarie>
Oct 01 19:40:37 herezilo NetworkManager[944]: <info>  [1759340437.7978] device (virbr0): state change: secondaries -> activat>
Oct 01 19:40:37 herezilo NetworkManager[944]: <info>  [1759340437.7981] device (virbr0): Activation: successful, device activ>
Oct 01 19:40:39 herezilo kernel: BUG: kernel NULL pointer dereference, address: 0000000000000000
Oct 01 19:40:39 herezilo kernel: #PF: supervisor write access in kernel mode
Oct 01 19:40:39 herezilo kernel: #PF: error_code(0x0002) - not-present page
Oct 01 19:40:39 herezilo kernel: PGD 0 P4D 0 
Oct 01 19:40:39 herezilo kernel: Oops: Oops: 0002 [#2] SMP NOPTI
Oct 01 19:40:39 herezilo kernel: CPU: 12 UID: 0 PID: 5655 Comm: nodev-device-ev Tainted: G      D    OE       6.16.8-1-MANJAR>
Oct 01 19:40:39 herezilo kernel: Tainted: [D]=DIE, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
Oct 01 19:40:39 herezilo kernel: Hardware name: Acer Nitro AN515-45/Scala_CAS, BIOS V1.08 07/21/2021
Oct 01 19:40:39 herezilo kernel: RIP: 0010:snd_sof_pci_amd_acp63_driver_exit+0x510/0xf10 [snd_sof_amd_acp63]
Oct 01 19:40:39 herezilo kernel: Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00>
Oct 01 19:40:39 herezilo kernel: RSP: 0018:ffffce624e20bae8 EFLAGS: 00010286
Oct 01 19:40:39 herezilo kernel: RAX: 0000000000000000 RBX: ffff8a144a343c00 RCX: 0000000000000012
Oct 01 19:40:39 herezilo kernel: RDX: ffffffffc05d7600 RSI: ffff8a14db5e5000 RDI: ffff8a144a343c00
Oct 01 19:40:39 herezilo kernel: RBP: ffff8a14db5e5000 R08: 00000000000007ee R09: 00000000ffffffff
Oct 01 19:40:39 herezilo kernel: R10: 0000000000000000 R11: 0000000000000004 R12: 0000000000000000
Oct 01 19:40:39 herezilo kernel: R13: ffff8a14db5e5000 R14: 0000000000000001 R15: 0000000000000001
Oct 01 19:40:39 herezilo kernel: FS:  00007f70aeffd6c0(0000) GS:ffff8a17a5a1b000(0000) knlGS:0000000000000000
Oct 01 19:40:39 herezilo kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Oct 01 19:40:39 herezilo kernel: CR2: 0000000000000000 CR3: 000000015d77b000 CR4: 0000000000f50ef0
Oct 01 19:40:39 herezilo kernel: PKRU: 55555554
1 Like
2

I run virt-manager on a daily basis on 6.16. The problem is more likely unique to your chipset or CPU.

I always have the LTS kernel handy to boot. The latest linux-meta kernel has, at least for me, messed something up with KVM or otherwise; rendering some or all of my guests useless. Itā€™s rare, but itā€™s happened on more than one occasion for me.

But you said it also breaks in the LTS kernel? (But not in a new install on the same system?)

You also didnā€™t say what ā€œbreakā€ means? Your system freezes? Itā€™s just a log entry? And what do you do to trigger it?

That aside. Itā€™s the audio chipset module thatā€™s throwing the register dump in your logs, which may have nothing to do with virtualistion at all.

3

Hello Molski,

it seems I wasnā€™t clear enough. I will reformulate.

LTS kernel 6.12.48-1-MANJARO is working fine.
kernel 6.15.11-2-MANJARO is working fine too.

Only kernel 6.16.8-1-MANJARO is reporting the kernel entries into the journal after virt-manager started.

The ā€˜breakageā€™ with 6.16 kernel is no connection succeed after starting virtmanager (ie: QEMU/Kvm connection is trying to connect forever).
However Iā€™m able to connect using virsh. I could create a VM with this utility.

4

update to a newer one or stay on lts. there have been serious changes for kvm/qemu/libvirt with kernel 6.16.xx under the hood and itā€™s worthless to argue why a rolling-release-kernel version might suffer. your ā€œproblemā€ is related to some sound-device-module setting. live with it or sort it out. acer has never been a brand that plays well with linux.

kernel 6.16.8-1

is dead

5

Abandoned topic (30+ days)