Re: regression with mainline kernel

[Sudip Mukherjee]

Hi Linus,

On Sat, Nov 13, 2021 at 5:07 PM Linus Torvalds
 wrote:
>
> [ Hmm. This email was marked as spam for me. I see no obvious reason
> for it being marked as spam, but it happens.. ]
>
> On Thu, Nov 11, 2021 at 12:52 PM Sudip Mukherjee
>  wrote:
> >
> > # first bad commit: [cd7f5ca33585918febe5e2f6dc090a21cfa775b0]
> > drm/virtio: implement context init: add virtio_gpu_fence_event
>
> Hmm. Judging from your automated screenshots, the login never appears.
>



>
> HOWEVER - it has had a fix for a NULL pointer dereference in the
> meantime - can you check whether the current top of tree happens to
> work for you? Maybe your problem isn't due to "that commit does
> unnatural things", but simply due to the bug fixed in d89c0c8322ec
> ("drm/virtio: Fix NULL dereference error in virtio_gpu_poll").
>
> And if it's still broken with that commit, I'll happily revert it and
> people need to go back to the drawing board.

I sent another mail yesterday which is now at
https://lore.kernel.org/lkml/CADVatmOOzCxAgLhCu1tTz=44sgrdxds5-omz3v0w4f5klcl...@mail.gmail.com/
I will just pase that here for you.

Last night's test on 66f4beaa6c1d worked fine. So I guess this has now
been fixed.

I have not done a bisect to see what has fixed it, but looking at the
log I think it will be that NULL pointer fix.


-- 
Regards
Sudip
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Re: [GIT PULL] virtio-mem changes for v5.16

[pr-tracker-bot]

The pull request you sent on Wed, 10 Nov 2021 17:37:54 +0100:

> https://github.com/davidhildenbrand/linux.git tags/virtio-mem-for-5.16

has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/ccfff0a2bd2a30de130b5623d242ddecd0272bc2

Thank you!

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Re: regression with mainline kernel

[Linus Torvalds]

[ Hmm. This email was marked as spam for me. I see no obvious reason
for it being marked as spam, but it happens.. ]

On Thu, Nov 11, 2021 at 12:52 PM Sudip Mukherjee
 wrote:
>
> # first bad commit: [cd7f5ca33585918febe5e2f6dc090a21cfa775b0]
> drm/virtio: implement context init: add virtio_gpu_fence_event

Hmm. Judging from your automated screenshots, the login never appears.

> And, indeed reverting cd7f5ca33585 on top of debe436e77c7 has fixed
> the problem I was seeing on my qemu test of x86_64. The qemu image is
> based on Ubuntu.

Presumably either that commit is somehow buggy in itself - or it does
exactly what it means to do, and the new poll() semantics just
confuses the heck out of the X server (or wayland or whatever).

And honestly, if I read that thing correctly, the patch is entirely
broken. The new poll function (virtio_gpu_poll()) will unconditionally
remove the first event from the event list, and then report "Yeah, I
had events".

This is completely bogus for a few reasons:

 - poll() really should be idempotent, because the poll function gets
called multiple times

 - it doesn't even seem to check that the event that it removes is the
new VIRTGPU_EVENT_FENCE_SIGNALED_INTERNAL kind of event, so it will
unconditionally just remove random events.

 - it does seem to check the "vfpriv->ring_idx_mask" and do the old
thing if that is zero, but I see absolutely no reason for that (and
that check itself has caused problems, see below)

Honestly, my reaction to this all is that that commit is fundamentally
broken and probably should be reverted regardless as "this commit does
bad things".

HOWEVER - it has had a fix for a NULL pointer dereference in the
meantime - can you check whether the current top of tree happens to
work for you? Maybe your problem isn't due to "that commit does
unnatural things", but simply due to the bug fixed in d89c0c8322ec
("drm/virtio: Fix NULL dereference error in virtio_gpu_poll").

And if it's still broken with that commit, I'll happily revert it and
people need to go back to the drawing board.

In fact, I would really suggest that people look at that
virtio_gpu_poll() function regardless. That odd "let's unconditionally
just drop events in the poll function is really REALLY broken
behavior.

  Linus
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WorldCist'22 - 10th World Conference on IST | Montenegro | Deadline: November 24

[WorldCIST]

* Conference listed in CORE Ranking

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Re: regression with mainline kernel

[Sudip Mukherjee]

On Thu, Nov 11, 2021 at 8:51 PM Sudip Mukherjee
 wrote:
>
> Hi Linus,
>
> On Thu, Nov 11, 2021 at 2:03 PM Sudip Mukherjee
>  wrote:
> >
> > Hi Linus,
> >
> > My testing has been failing for the last few days. Last good test was
> > with 6f2b76a4a384 and I started seeing the failure with ce840177930f5
> > where boot timeout.

Last night's test on 66f4beaa6c1d worked fine. So I guess this has now
been fixed.
Thanks.


-- 
Regards
Sudip
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Re: [GIT PULL] virtio-mem changes for v5.16

[David Hildenbrand]

On 10.11.21 17:37, David Hildenbrand wrote:
> Hi Linus,
> 
> usually this would have went via the vhost tree, but as this patch depends
> on some patches that just went in via Andrews tree and MST doesn't have
> any other patches for this merge window, I'm sending it myself
> and base it on current mainline that contains the relevant commits
> already. Thanks!
> 

This is most probably at the end of the PULL queue, just a heads up that
it would be really nice to have this in v5.16. Thanks!


-- 
Thanks,

David / dhildenb

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