[Virtio-fs] Kernel patches on latest linux kernel

Fri Jul 10 09:51:23 UTC 2020

Huuh it seems I'm running into some issue wrt PCI hotplug.
If I remove my virtio-fs-pci device from my VM, I get the
following error from the guest kernel:

[  135.347517] general protection fault, probably for non-canonical address 0xa37366424f344963: 0000 [#1] SMP PTI
[  135.353330] CPU: 0 PID: 21 Comm: kworker/u2:2 Not tainted 5.8.0-rc4+ #317
[  135.357176] Hardware name: Cloud Hypervisor cloud-hypervisor, BIOS 0
[  135.360724] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
[  135.363578] RIP: 0010:kill_dax+0xd/0x70
[  135.365642] Code: d0 02 00 00 04 c3 0f 1f 80 00 00 00 00 48 8b 87 d0 02 00 00 83 e0 01 c3 0f 1f 44 00 00 48 85 ff 74 60 55 48 89 e5 53 48 89 fb <3e> 80 a7 d0 02 00 00 fe 48 c7 c7 80 b2 07 ae e8 df 69 bd ff 48 c7
[  135.375052] RSP: 0018:ffffb464000b7b10 EFLAGS: 00010286
[  135.377791] RAX: ffffffffad3cdcf0 RBX: a37366424f344963 RCX: 0000000000000282
[  135.380378] RDX: ffff8e6c7976ec40 RSI: ffff8e6c7976ea98 RDI: a37366424f344963
[  135.382880] RBP: ffffb464000b7b18 R08: ffffb464000b7b78 R09: ffffb464000b7b78
[  135.384876] R10: ffff8e6c7c1e9e00 R11: 0000000000000001 R12: ffffb464000b7b78
[  135.386864] R13: ffff8e6c7976ea80 R14: ffff8e6c7976ea80 R15: ffff8e6c79744ab0
[  135.388623] FS:  0000000000000000(0000) GS:ffff8e6c7ec00000(0000) knlGS:0000000000000000
[  135.390417] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  135.391741] CR2: 00007fcf64d08db0 CR3: 000000003c112001 CR4: 00000000003606b0
[  135.393248] Call Trace:
[  135.393808]  virtio_fs_cleanup_dax+0x11/0x20
[  135.394666]  devm_action_release+0x10/0x20
[  135.395468]  release_nodes+0x22c/0x270
[  135.396216]  devres_release_all+0x3a/0x50
[  135.397016]  device_release_driver_internal+0xfb/0x1c0
[  135.397974]  device_release_driver+0xd/0x10
[  135.398681]  bus_remove_device+0xdc/0x150
[  135.399369]  device_del+0x16f/0x3f0
[  135.399981]  device_unregister+0x16/0x60
[  135.400662]  unregister_virtio_device+0x13/0x30
[  135.401446]  virtio_pci_remove+0x28/0x60
[  135.402119]  pci_device_remove+0x39/0xa0
[  135.402778]  device_release_driver_internal+0xeb/0x1c0
[  135.403535]  device_release_driver+0xd/0x10
[  135.404182]  pci_stop_bus_device+0x6b/0x90
[  135.404803]  pci_stop_and_remove_bus_device+0xe/0x20
[  135.405573]  disable_slot+0x4a/0x90
[  135.406123]  acpiphp_disable_and_eject_slot+0x15/0x80
[  135.406877]  acpiphp_hotplug_notify+0x184/0x280
[  135.407581]  ? free_bridge+0x130/0x130
[  135.408165]  acpi_device_hotplug+0xdd/0x390
[  135.408734]  acpi_hotplug_work_fn+0x1d/0x30
[  135.409313]  process_one_work+0x192/0x2e0
[  135.409856]  worker_thread+0x4b/0x3b0
[  135.410359]  kthread+0x10a/0x140
[  135.410823]  ? process_one_work+0x2e0/0x2e0
[  135.411390]  ? __kthread_parkme+0x60/0x60
[  135.411962]  ret_from_fork+0x22/0x30
[  135.412501] ---[ end trace bbfed4f67497ceb8 ]---

Any chance you already ran into this problem?

Thanks,
Sebastien
________________________________
From: virtio-fs-bounces at redhat.com <virtio-fs-bounces at redhat.com> on behalf of Boeuf, Sebastien <sebastien.boeuf at intel.com>
Sent: Friday, July 10, 2020 8:47 AM
To: Vivek Goyal <vgoyal at redhat.com>
Cc: virtio-fs at redhat.com <virtio-fs at redhat.com>
Subject: Re: [Virtio-fs] Kernel patches on latest linux kernel

Oh cool! Thanks Vivek, I'll keep you posted if I run into any issue.

Sebastien
________________________________
From: Vivek Goyal <vgoyal at redhat.com>
Sent: Thursday, July 9, 2020 9:44 PM
To: Boeuf, Sebastien <sebastien.boeuf at intel.com>
Cc: virtio-fs at redhat.com <virtio-fs at redhat.com>
Subject: Re: Kernel patches on latest linux kernel

Hi Sebastien,

I rebased virtiofs dax patches on top of 5.8-rc4. Give it a try.

https://gitlab.com/virtio-fs/linux/-/commits/vivek-july-09-2020

Thanks
Vivek

On Wed, Jun 17, 2020 at 01:58:54PM +0000, Boeuf, Sebastien wrote:
> Sounds good, thank you Vivek for the heads up 🙂
>
> Sebastien
> ________________________________
> From: Vivek Goyal <vgoyal at redhat.com>
> Sent: Wednesday, June 17, 2020 3:52 PM
> To: Boeuf, Sebastien <sebastien.boeuf at intel.com>
> Cc: virtio-fs at redhat.com <virtio-fs at redhat.com>
> Subject: Re: Kernel patches on latest linux kernel
>
> On Fri, Jun 12, 2020 at 09:00:50AM +0000, Boeuf, Sebastien wrote:
> > Hi folks,
> >
> > Just wondering when the kernel patch series will be rebased on top of latest kernel?
>
> Hi Sebastien,
>
> I will try to take care of this week or next week and rebase the patches
> on top of 5.8-rc1
>
> Thanks
> Vivek
>
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Intel Corporation SAS (French simplified joint stock company)
Registered headquarters: "Les Montalets"- 2, rue de Paris, 
92196 Meudon Cedex, France
Registration Number:  302 456 199 R.C.S. NANTERRE
Capital: 4,572,000 Euros

This e-mail and any attachments may contain confidential material for
the sole use of the intended recipient(s). Any review or distribution
by others is strictly prohibited. If you are not the intended
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