*ERROR* connector HDMI-A-1 leaked - kernel NULL pointer dereference - iommu vga

[ionutnechita]

Hi Intel Kernel Team,

I use this commit for create new kernel: Intel Linux LTS Kernel version: 5.10.47, branch 5.10/yocto

Commit: drm/i915: including necessary header file SHA: d75bc4fd519e80cd379997651b77218cb949ecf7

I notice that it freezes / hang when I detach and attach the IOMMU VGA controller.

dmesg -l err
[  830.581844] [drm:drm_mode_config_cleanup [drm]] *ERROR* connector HDMI-A-1 leaked!
[  830.579063] BUG: kernel NULL pointer dereference, address: 00000000000000ac
[  830.579067] #PF: supervisor write access in kernel mode
[  830.579069] #PF: error_code(0x0002) - not-present page
[  863.733808] DMAR: DRHD: handling fault status reg 3
[  863.733815] DMAR: [DMA Read] Request device [00:02.0] PASID ffffffff fault addr 8b821000 [fault reason 02] Present bit in context entry is clear
[  863.733866] DMAR: DRHD: handling fault status reg 3
[  863.733872] DMAR: [DMA Read] Request device [00:02.0] PASID ffffffff fault addr 8b822000 [fault reason 02] Present bit in context entry is clear
[  863.733889] DMAR: DRHD: handling fault status reg 3
[  863.733893] DMAR: [DMA Read] Request device [00:02.0] PASID ffffffff fault addr 8b823000 [fault reason 02] Present bit in context entry is clear
[  863.733950] DMAR: DRHD: handling fault status reg 3

CPU: Intel(R) Core(TM) i7-9700TE CPU @ 1.80GHz GPU: Intel Corporation UHD Graphics 630 (Desktop 9 Series) (rev 02) i915-hang-iommu-enable-detach-device.txt

[ionutnechita]

I migrated to 5.15. I'm not testing this version anymore.

Ticket is closed.