[Bug 104762] Various segfaults/problems in qt/plasma

[Bug 104762] Various segfaults/problems in qt/plasma

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=104762

            Bug ID: 104762
           Summary: Various segfaults/problems in qt/plasma
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: haagch@frickel.club
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 136931
  --> https://bugs.freedesktop.org/attachment.cgi?id=136931&action=edit
mostly useless gdb backtrace

I think it's related to the series that ended with this commit
"st/glsl_to_tgsi: add ARB_get_program_binary support using TGSI"
https://cgit.freedesktop.org/mesa/mesa/commit/?id=a20016d8277f9cd68620784417a57ae227783a04
but I have to try around a bit more.

It doesn't always happen. I think it's related to the shader cache. Sometimes
deleting the shader cache helps, sometimes it doesn't. I think
MESA_EXTENSION_OVERRIDE=-GL_ARB_get_program_binary helps.

Usually export LD_LIBRARY_PATH=... LIBGL_DRIVERS_PATH=... to another mesa
build, starting the application once and then starting it with the system mesa
again helps. It could be related to mesa first deleting the other shader cache
before making a new one. Some weird race condition?

Applications I've seen affected:
sddm-greeter (segfaulting)
plasmashell (segfaulting
systemsettings (rendering black window content, segfaulting)
krunner (rendering breaking, segfaulting)

As far as I can tell it doesn't happen with mesa debug builds...

More investigation is needed.

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[Bug 104762] Various segfaults/problems in qt/plasma

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=104762

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |t_arceri@yahoo.com.au

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Can you try running an affected application in valgrind (either with a debug
build of radeonsi_dri.so, or at least a release build with -g)?

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[Bug 104762] Various segfaults/problems in qt/plasma

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=104762

--- Comment #2 from Christoph Haag <haagch@frickel.club> ---
Created attachment 136932
  --> https://bugs.freedesktop.org/attachment.cgi?id=136932&action=edit
systemsettings black

I think I have tried running with valgrind before. I tried valgrind with -Og
mesa rendering the black window, but no (relevant) errors comes up.

To describe one case:
I just tried a mesa debug build and everything worked normal.
Then with the same options, but a release build with additionally CFLAGS=-Og
CXXFLAGS=-Og renders systemsettings5 and plasmashell completely black. No
segfaults this time. Starting plasmashell and systemsettings with
MESA_EXTENSION_OVERRIDE=-GL_ARB_get_program_binary makes it display normally.
But starting it without the variable after that makes it black again. Deleting
the shader cache does not help in this case.

But after starting systemsettings5 with another mesa installation once, it
starts working normally with the mesa build that produced the black window just
before too.

It's possible the segfaults and the black windows are different problems but
they started happening at the same time.

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[Bug 104762] Various segfaults/problems in qt/plasma

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https://bugs.freedesktop.org/show_bug.cgi?id=104762

Mike Lothian <mike@fireburn.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mike@fireburn.co.uk

--- Comment #3 from Mike Lothian <mike@fireburn.co.uk> ---
I made this go away by deleting ~/.cache/qtshadercache and
~/.cache/mesa_shader_cache

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[Bug 104762] Various segfaults/problems in qt/plasma

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=104762

Christoph Haag <haagch@frickel.club> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #136931|0                           |1
        is obsolete|                            |

--- Comment #4 from Christoph Haag <haagch@frickel.club> ---
Created attachment 136940
  --> https://bugs.freedesktop.org/attachment.cgi?id=136940&action=edit
better gdb backtrace

Managed to get a segfault (happens every time now) with the same mesa build
that previously was just showing a black screen, now with a better backtrace.

Deleting only the qt shadercache (TIL that's a thing) doesn't help. Deleting
only the mesa shader cache doesn't help. Deleting both does help. Weird.

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[Bug 104762] Various segfaults/problems in qt/plasma

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=104762

--- Comment #5 from Timothy Arceri <t_arceri@yahoo.com.au> ---
Created attachment 136950
  --> https://bugs.freedesktop.org/attachment.cgi?id=136950&action=edit
possible fix

I wasn't able to reproduce the issue, but can you give this patch a try?

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[Bug 104762] Various segfaults/problems in qt/plasma

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=104762

--- Comment #6 from Dieter Nützel <Dieter@nuetzel-hh.de> ---
Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de>

I got it since the commit went in.
Deleting both like Mike suggested worked here since that time, too.
I ignored it 'cause I thought that I'm running devel stuff and my son's account
switched daily from Mesa devel to release back and forth...;-)

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[Bug 104762] Various segfaults/problems in qt/plasma

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=104762

--- Comment #7 from Christoph Haag <haagch@frickel.club> ---
(In reply to Timothy Arceri from comment #5)
> Created attachment 136950 [details] [review]
> possible fix
> 
> I wasn't able to reproduce the issue, but can you give this patch a try?

Preliminary result: It does not help, after booting today with the patch
plasmashell was segfaulting again until
rm -rf ~/.cache/mesa_shader_cache/ ~/.cache/qtshadercache

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[Bug 104762] Various segfaults/problems in qt/plasma

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https://bugs.freedesktop.org/show_bug.cgi?id=104762

--- Comment #8 from Dieter Nützel <Dieter@nuetzel-hh.de> ---
Sometimes I wiped this, too.

.cache/plasmashell/qmlcache/
.cache/ksycoca5_de_***
.cache/plasma-svgelements-***
.cache/plasma_theme_***
.cache/icon-cache.kcache

All above files would be regenerated automatically.
After this KDE5/Plasma5 started all the time with a nice/clean desktop, again.

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[Bug 104762] Various segfaults/problems in qt/plasma

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https://bugs.freedesktop.org/show_bug.cgi?id=104762

--- Comment #9 from Mike Lothian <mike@fireburn.co.uk> ---
It might be worth keeping these somewhere rather than deleting. Once everything
is working, copy them back see if they issue can be reproduced that way

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[Bug 104762] Various segfaults/problems in qt/plasma

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https://bugs.freedesktop.org/show_bug.cgi?id=104762

--- Comment #10 from Timothy Arceri <t_arceri@yahoo.com.au> ---
I was able to reproduce the problem. Fix sent to list:

https://patchwork.freedesktop.org/series/37147/

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[Bug 104762] Various segfaults/problems in qt/plasma

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https://bugs.freedesktop.org/show_bug.cgi?id=104762

Timothy Arceri <t_arceri@yahoo.com.au> changed:

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

--- Comment #11 from Timothy Arceri <t_arceri@yahoo.com.au> ---
Shoul be fixed by the following commit. Please reopen if the issue continues.

commit 041b18cf23a0acf7b0eddf63cd7a2a10192432a1
Author: Timothy Arceri <tarceri@itsqueeze.com>
Date:   Fri Jan 26 11:56:50 2018 +1100

    st/shader_cache: restore num_tgsi_tokens when loading from cache

    Without this we will fail to correctly serialise programs when
    using glGetProgramBinary() if the program was retrieved from
    the disk cache rather than freshly compiled.

    Fixes: c69b0dd6817b "st/glsl_to_tgsi: store num_tgsi_tokens in
st_*_program"

    Reviewed-by: Gert Wollny <gw.fossdev@gmail.com>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104762

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[Bug 104762] Various segfaults/problems in qt/plasma

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https://bugs.freedesktop.org/show_bug.cgi?id=104762

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ao@thurston.ru

--- Comment #12 from Michel Dänzer <michel@daenzer.net> ---
*** Bug 104806 has been marked as a duplicate of this bug. ***

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[Bug 104762] Various segfaults/problems in qt/plasma

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https://bugs.freedesktop.org/show_bug.cgi?id=104762

--- Comment #13 from Mike Lothian <mike@fireburn.co.uk> ---
That commit needs to be cherry picked to the 18.0 branch

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[Bug 104762] Various segfaults/problems in qt/plasma

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https://bugs.freedesktop.org/show_bug.cgi?id=104762

--- Comment #14 from Dennis Schridde <devurandom@gmx.net> ---
Confirming: 041b18cf23a0acf7b0eddf63cd7a2a10192432a1 applied to 18.0.0_rc3,
followed by cleaning ~/.cache of root, sddm and my user stops the crashes.

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[Bug 104762] Various segfaults/problems in qt/plasma

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https://bugs.freedesktop.org/show_bug.cgi?id=104762

Fireball <ao@thurston.ru> changed:

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

--- Comment #15 from Fireball <ao@thurston.ru> ---
I still experience this with mesa 18.0.0_rc3 and r600 driver.
Resolution first looked ok, user processes (plasmashell etc.) stopped crashing,
but screen locker and logout screen crash (not right away, after a few hours of
working).

As always, clearing caches in /root/.cache and /var/lib/sddm/.cache helps, but
this problem would occur again.
I use Qt 5.9.4.
Backtrace of /usr/lib64/libexec/ksmserver-logout-greeter mentions
/usr/lib64/dri/r600_dri.so.

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[Bug 104762] Various segfaults/problems in qt/plasma

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https://bugs.freedesktop.org/show_bug.cgi?id=104762

--- Comment #16 from Dennis Schridde <devurandom@gmx.net> ---
(In reply to Fireball from comment #15)
> I still experience this with mesa 18.0.0_rc3 and r600 driver.

It is not supposed to be fixed by rc3, since Timothy's patch
041b18cf23a0acf7b0eddf63cd7a2a10192432a1 only got applied after that version
was released.  It also was not yet backported to the 18.0 branch [1], so for
now you need to apply it manually (e.g. by placing it in
/etc/portage/patches/media-libs/mesa-18.0.0_rc3, if you are on Gentoo).

[1]: https://cgit.freedesktop.org/mesa/mesa/log/?h=18.0

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[Bug 104762] Various segfaults/problems in qt/plasma

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[-- Attachment #1.1: Type: text/plain, Size: 665 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=104762

Timothy Arceri <t_arceri@yahoo.com.au> changed:

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

--- Comment #17 from Timothy Arceri <t_arceri@yahoo.com.au> ---
Please don't reopen this bug, the fix is already in master and has been tagged
as a fix in the commit message so it will be picked up in the next stable
version.

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[Bug 104762] Various segfaults/problems in qt/plasma

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[-- Attachment #1.1: Type: text/plain, Size: 454 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=104762

--- Comment #18 from Christoph Haag <haagch@frickel.club> ---
To be fair, the segfaults are fixed, but sddm and plasmashell randomly not
working/rendering until the shader cache(s) are deleted is still happening.
Unfortunately that's a bit harder to debug, but there might still be a similar
issue hiding somewhere.

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[Bug 104762] Various segfaults/problems in qt/plasma

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https://bugs.freedesktop.org/show_bug.cgi?id=104762

--- Comment #19 from Christoph Haag <haagch@frickel.club> ---
(In reply to Christoph Haag from comment #18)
> To be fair, the segfaults are fixed, but sddm and plasmashell randomly not
> working/rendering until the shader cache(s) are deleted is still happening.
> Unfortunately that's a bit harder to debug, but there might still be a
> similar issue hiding somewhere.

This may be rather bug 105065, which is really a QT bug:
https://bugreports.qt.io/browse/QTBUG-66420

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