Re: Kernel/driver hacking: panic: Assertion vm_object_busied((m->object)) failed at /usr/src/sys/vm/vm_page.c:5455

From: Neel Chauhan <nc_at_FreeBSD.org>
Date: Wed, 16 Jun 2021 08:28:20 -0700
Hi,

On 2021-06-16 00:35, Hans Petter Selasky wrote:
> Do you have the full backtrace?

Yes.

I have attached a stack trace in the previous email, but if you didn't 
get it, I have uploaded it to GitHub: 
https://gist.github.com/neelchauhan/437bd10239f84c563aafb37ab440029a

> Doesn't this code work in the current DRM - kmod? What changed? Did
> you perhaps miss a patch?

I think there is new code with Linux 5.6 which changes how this is done.

I have been attempting to make a FreeBSD equivalent, but it panics. It 
is **not** from missing Linux commits since I believe I added them all.

The code in my GH repo: 
https://github.com/neelchauhan/drm-kmod/blob/5.7-wip/drivers/gpu/drm/i915/gem/i915_gem_mman.c#L346

> --HPS

-Neel (nc_at_)
Received on Wed Jun 16 2021 - 15:28:20 UTC

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