Nouveau - Dec 2017 - [Bug 104291] New: Virgl broken on current mesa (17.4+), with nouveau/nv50 as host

https://bugs.freedesktop.org/show_bug.cgi?id=104291

            Bug ID: 104291
           Summary: Virgl broken on current mesa (17.4+), with
                    nouveau/nv50 as host
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: randrik at mail.ru
        QA Contact: nouveau at lists.freedesktop.org

Hello.

Sorry for possibly irrelevant bug report, but I just tested virgl and found it
broken - glxinfo works, but glxgears or any gl program segfaults.

On both host and guest (self-assembled live DVD) I have mesa Mesa 17.4.0-devel
(git-96fc5fbf23), X server 1.19.5. Host kernel - Linux slax 4.14.3-x64 #18 SMP
Sun Dec 3 09:13:07 MSK 2017 x86_64 AMD FX(tm)-4300 Quad-Core Processor
AuthenticAMD GNU/Linux, guest kernel - 4.12.0-x64.

Qemu - 2.11. Launch command and output:

qemu-system-x86_64 -M q35 -enable-kvm -cdrom /dev/shm/slax_16_12_2017_test.iso
-m 512 -display sdl,gl=on -soundhw es1370 -smp 4 -vga virtio -usbdevice mouse
qemu-system-x86_64: -usbdevice mouse: '-usbdevice' is deprecated, please
use
'-device usb-...' instead
gl_version 33 - core profile enabled

startx inside guest works, glxinfo shows virgl as renderer, but glxgears or any
gl program (chromium BSU [old arcade game], glblur from xscreensavers)
segfaults.

At some point it was working better, but it was long ago .... (16.02.2016, to
be prescie).

I also run into assertion on qemu side, described here: 
https://lists.gnu.org/archive/html/qemu-devel/2017-04/msg05461.html

Because I had only dvd image connected as dvd rom - nothing bad happened, but
be aware about this abort if you connect real hard disk ....

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--- Comment #1 from Andrew Randrianasulu <randrik at mail.ru> ---
One more comment - while both kernels are 64-bit - whole userspace for guest
and host are just 32-bit binaries. It may play some role.

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--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
If you can capture an apitrace of qemu that replays incorrectly on nouveau but
correctly on other hardware, then this is a nouveau bug.

If virgl / virglrenderer code crashes (or generates an incorrect GL operation
sequence), then it's a virgl bug.

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--- Comment #3 from Andrew Randrianasulu <randrik at mail.ru> ---
Created attachment 136219
  --> https://bugs.freedesktop.org/attachment.cgi?id=136219&action=edit
glxinfo -l from inside guest

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--- Comment #4 from Andrew Randrianasulu <randrik at mail.ru> ---
Created attachment 136220
  --> https://bugs.freedesktop.org/attachment.cgi?id=136220&action=edit
gdb log

Unfortunately, I stripped debug symbols for smaller file sizes. I can recompile
mesa with debug symbols, but it will take some time.

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--- Comment #5 from Ilia Mirkin <imirkin at alum.mit.edu> ---
If it crashes inside the guest, then it's nothing to do with nouveau. Most
likely.

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--- Comment #6 from Andrew Randrianasulu <randrik at mail.ru> ---
(In reply to Ilia Mirkin from comment #5)
> If it crashes inside the guest, then it's nothing to do with nouveau.
Most
> likely.
ya, but I was unable to find virgl as specific component  in bugzilla, so I
just  added bug to nouveau. Don't feel blamed. (and  after swithcing virtual
desktops whole image inside qemu just become real black ..I killed this VM)

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--- Comment #7 from Andrew Randrianasulu <randrik at mail.ru> ---
It also doesn't work with  LIBGL_ALWAYS_SOFTWARE=1 (llvmpipe). So, yes, not
nouveau bug....

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Andrew Randrianasulu <randrik at mail.ru> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #136220|0                           |1
        is obsolete|                            |

--- Comment #8 from Andrew Randrianasulu <randrik at mail.ru> ---
Created attachment 136221
  --> https://bugs.freedesktop.org/attachment.cgi?id=136221&action=edit
slightly better gdb log

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--- Comment #9 from Andrew Randrianasulu <randrik at mail.ru> ---
Created attachment 136222
  --> https://bugs.freedesktop.org/attachment.cgi?id=136222&action=edit
X log (from guest, of course)

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--- Comment #10 from Andrew Randrianasulu <randrik at mail.ru> ---
Created attachment 136223
  --> https://bugs.freedesktop.org/attachment.cgi?id=136223&action=edit
apitrace

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--- Comment #11 from Andrew Randrianasulu <randrik at mail.ru> ---
I tried few older mesa releases (17.1.10 - without llvm, 17.2.7 and 17.3.0 -
with llvm 5.0.0), and they all segfaults :/

This is kinda strange, because according to this bugreport it was working in
17.1-dev era:

https://bugzilla.redhat.com/show_bug.cgi?id=1426549

I tried disabling PageFlipping (not sure if it makes any sense for VM), and
switching dri mode to dri3. Nothing helped :/

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Andrew Randrianasulu <randrik at mail.ru> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #12 from Andrew Randrianasulu <randrik at mail.ru> ---
Sorry, it works now (Mesa 18.2.0-devel (git-96ed3714fc) for both guest and
host). Apparently, I just forgot to mount /dev/shm in initscripts in guest, and
dri3  failed.

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