Bug 753629

Summary:	x11-drivers/nvidia-drivers-455.38 modules do not load with kernel >5.8
Product:	Gentoo Linux	Reporter:	Saul Peebsen <jaglover>
Component:	Current packages	Assignee:	David Seifert <soap>
Status:	RESOLVED OBSOLETE
Severity:	normal	CC:	ionen, jstein, luke, waebbl-gentoo
Priority:	Normal
Version:	unspecified
Hardware:	AMD64
OS:	Linux
See Also:	https://bugs.gentoo.org/show_bug.cgi?id=747028
Whiteboard:
Package list:		Runtime testing required:	---

Description Saul Peebsen 2020-11-09 01:56:25 UTC

Kernel module nvidia_uvm fails to load with following error:
nvidia_uvm: Unknown symbol radix_tree_preloads (err -2)
nVidia announcement: "Due to an incompatibility issue, we advise customers to defer updating to Linux Kernel 5.9+ until mid-November when an NVIDIA Linux GPU driver update with Kernel 5.9+ support is expected to be available. Linux Kernel 5.9+ is incompatible with current and previous NVIDIA Linux GPU drivers."

Reproducible: Always

Steps to Reproduce:
1. Install kernel 5.9
2. Build nvidia modules
3. Load nvidia modules
Actual Results:  
Module nvidia loads, nvidia_uvm fails to load. As a result CUDA will not execute.

Expected Results:  
All modules load and are functional.

Comment 1 Ionen Wolkens gentoo-dev

2020-11-09 03:30:52 UTC

More precisely this bug applies to >=nvidia-drivers-450.80.02[uvm]

May be good to keep the bug open for reference until nvidia fix it but don't think much can done here, or at most "maybe" a ebuild warning when USE=uvm + kernel >=5.9.

It's possible to workaround by patching the kernel (see bug #747028 comment #8), not that a patch to circumvent license restrictions is something gentoo should add, but users are free to do what they want.

Otherwise, if you need USE=uvm / cuda / opencl / nvenc / etc..., do as nvidia advise. For common usage (games, vdpau) then 5.9 is known to be fine.

Comment 2 Ionen Wolkens gentoo-dev

2021-03-02 22:32:57 UTC

All in-tree modules now have full 5.10 support and I don't believe this is relevant anymore.