[Bug 94242] [radeonsi] Crash while running Fedora mock tool for prompting root (gtksu)

[Bug 94242] [radeonsi] Crash while running Fedora mock tool for prompting root (gtksu)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=94242

            Bug ID: 94242
           Summary: [radeonsi] Crash while running Fedora mock tool for
                    prompting root (gtksu)
           Product: Mesa
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: shawn.starr@rogers.com
        QA Contact: dri-devel@lists.freedesktop.org

Kernel: 4.5.0-0.rc4.git2.2.fc24.x86_64
MESA: git master, Feb 19-20th builds
LLVM: trunk 3.9, Feb 19-20th builds
DDX: 

For some reason, X crashes with radeonsi triggering VM fault, when in GNOME or
KDE environments:


If you open up a shell console (gnome-terminal, konsole etc), run mock as
non-root, as soon as an attempt to prompt for root happens (with gtksu) it
locks up system.

[   38.111551] radeon 0000:01:00.0: GPU fault detected: 146 0x0008480c
[   38.111861] radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR  
0x00000000
[   38.112219] radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS
0x0804800C
[   38.112576] VM fault (0x0c, vmid 4) at page 0, read from 'TC2' (0x54433200)
(72)
[   38.112931] radeon 0000:01:00.0: GPU fault detected: 146 0x0008440c
[   38.113229] radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR  
0x08000000
[   38.113587] radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS
0x08044001
[   38.113945] VM fault (0x01, vmid 4) at page 134217728, read from 'TC3'
(0x54433300) (68)

I've attached a VM fault debug of crash

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[Bug 94242] [radeonsi] Crash while running Fedora mock tool for prompting root (gtksu)

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https://bugs.freedesktop.org/show_bug.cgi?id=94242

--- Comment #1 from Shawn Starr <shawn.starr@rogers.com> ---
Created attachment 121873
  --> https://bugs.freedesktop.org/attachment.cgi?id=121873&action=edit
R600_DEBUG=check_vm capture of VM fault

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[Bug 94242] [radeonsi] Crash while running Fedora mock tool for prompting root (gtksu)

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https://bugs.freedesktop.org/show_bug.cgi?id=94242

--- Comment #2 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Shawn Starr from comment #0)
> If you open up a shell console (gnome-terminal, konsole etc), run mock as
> non-root, as soon as an attempt to prompt for root happens (with gtksu) it
> locks up system.

Since you can retrieve the GPUVM fault messages, it's hard to believe that the
system locks up completely. Can you try logging in via ssh after the problem
occurs and getting a gdb backtrace of the Xorg process?

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[Bug 94242] [radeonsi] Crash while running Fedora mock tool for prompting root (gtksu)

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https://bugs.freedesktop.org/show_bug.cgi?id=94242

--- Comment #3 from Michel Dänzer <michel@daenzer.net> ---
This isn't limited to gtksu. I can reproduce it fairly quickly by playing
around with a MATE desktop session (which seems to use GTK2). OTOH I haven't
run into it with this GNOME3 session, which mostly uses GTK3, though with some
GTK2 apps as well.

I bisected it to 9aaf28da ("radeonsi: enable compiling one variant per
shader"). I also confirmed that it happens with Marek's current si-one-variant
branch as well as an older snapshot of that branch.

Now the "fun" part will be tracking down which glamor shaders are broken by
this and why. Meanwhile, it might be better to disable the single shader
variant by default, especially on the 11.2 branch.

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[Bug 94242] [radeonsi] Crash while running Fedora mock tool for prompting root (gtksu)

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https://bugs.freedesktop.org/show_bug.cgi?id=94242

--- Comment #4 from Shawn Starr <shawn.starr@rogers.com> ---
Attempting to attach gdb to X, I am unable to break out of gdb.

X info:

X.Org X Server 1.18.0
Release Date: 2015-11-09
X Protocol Version 11, Revision 0

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[Bug 94242] [radeonsi] Crash while running Fedora mock tool for prompting root (gtksu)

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https://bugs.freedesktop.org/show_bug.cgi?id=94242

--- Comment #5 from Michel Dänzer <michel@daenzer.net> ---
Created attachment 121931
  --> https://bugs.freedesktop.org/attachment.cgi?id=121931&action=edit
apitrace reproducing the problem

This apitrace reproduces the problem for me on Kaveri and Tonga.

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[Bug 94242] [radeonsi] Crash while running Fedora mock tool for prompting root (gtksu)

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https://bugs.freedesktop.org/show_bug.cgi?id=94242

--- Comment #6 from Marek Olšák <maraeo@gmail.com> ---
Sadly, I can't reproduce this on Verde, Bonaire, Tonga using the apitrace.

Could you please get a new check_vm report with this branch?

https://cgit.freedesktop.org/~mareko/mesa/log/?h=ddebug-shader-dump

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[Bug 94242] [radeonsi] Crash while running Fedora mock tool for prompting root (gtksu)

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https://bugs.freedesktop.org/show_bug.cgi?id=94242

--- Comment #7 from Michel Dänzer <michel@daenzer.net> ---
Created attachment 121979
  --> https://bugs.freedesktop.org/attachment.cgi?id=121979&action=edit
check_vm dump from ddebug-shader-dump branch

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[Bug 94242] [radeonsi] Crash while running Fedora mock tool for prompting root (gtksu)

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https://bugs.freedesktop.org/show_bug.cgi?id=94242

--- Comment #8 from Marek Olšák <maraeo@gmail.com> ---
The bad news is the check_vm report probably doesn't contain the problematic
shaders. The good news is I can reproduce this after updating LLVM, thus this
is an LLVM bug. I'm bisecting.

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[Bug 94242] [radeonsi] Crash while running Fedora mock tool for prompting root (gtksu)

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https://bugs.freedesktop.org/show_bug.cgi?id=94242

--- Comment #9 from Marek Olšák <maraeo@gmail.com> ---
The first bad commit:

commit 98ef4478258fda9028cd1786841eca952c136319
Author: Tom Stellard <thomas.stellard@amd.com>
Date:   Fri Feb 12 23:45:29 2016 +0000

    AMDGPU/SI: Detect uniform branches and emit s_cbranch instructions

    Reviewers: arsenm

    Subscribers: mareko, MatzeB, qcolombet, arsenm, llvm-commits

    Differential Revision: http://reviews.llvm.org/D16603

    git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@260765
91177308-0d34-0410-b5e6-96231b3b80d8

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[Bug 94242] [radeonsi] Crash while running Fedora mock tool for prompting root (gtksu)

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https://bugs.freedesktop.org/show_bug.cgi?id=94242

--- Comment #10 from Marek Olšák <maraeo@gmail.com> ---
Created attachment 121988
  --> https://bugs.freedesktop.org/attachment.cgi?id=121988&action=edit
problematic shader

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[Bug 94242] [radeonsi] Crash while running Fedora mock tool for prompting root (gtksu)

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https://bugs.freedesktop.org/show_bug.cgi?id=94242

--- Comment #11 from Marek Olšák <maraeo@gmail.com> ---
The problematic shader is attached. It has "s_branch" at the end "ret"
somewhere in the middle. My initial theory is that the shader fails to jump to
the epilog, which is outside of the binary, and jumps somewhere else. It may be
even stuck in an infinite loop due to an incorrect jump.

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[Bug 94242] [radeonsi] Crash while running Fedora mock tool for prompting root (gtksu)

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https://bugs.freedesktop.org/show_bug.cgi?id=94242

Ilia Mirkin <imirkin@alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #121931|text/plain                  |application/octet-stream
          mime type|                            |

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[Bug 94242] [radeonsi] Crash while running Fedora mock tool for prompting root (gtksu)

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https://bugs.freedesktop.org/show_bug.cgi?id=94242

--- Comment #12 from Oleg Suchilov <thevoidnnos@gmail.com> ---
got the same issue.
Gigabyte HD7870
Arch Linux x64
mesa-git - from mesa-git repo (http://pkgbuild.com/~lcarlier/mesa-git/)
kernel - linux-mainline 4.5.0-rc7-mainline

radeon 0000:01:00.0: GPU fault detected: 147 0x0c024801
radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x0FFFF860
radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x02048001


last working version was on commit 89d25a8  (mesa-11.2)
problems started after commit ff360a5   (mesa-11.3)


when i launch 'plank' or 'mate-system-monitor' everything freezes (on some
versions/commits my mouse is still working and on some it doesn't) and my Xorg
server crashes. sometimes the session restarts, but after login the opengl is
not available (glxinfo shows some errors)

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[Bug 94242] [radeonsi] Crash while running Fedora mock tool for prompting root (gtksu)

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https://bugs.freedesktop.org/show_bug.cgi?id=94242

--- Comment #13 from Marek Olšák <maraeo@gmail.com> ---
The fix is under review: http://reviews.llvm.org/D17964

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[Bug 94242] [radeonsi] Crash while running Fedora mock tool for prompting root (gtksu)

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https://bugs.freedesktop.org/show_bug.cgi?id=94242

Michel Dänzer <michel@daenzer.net> changed:

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

--- Comment #14 from Michel Dänzer <michel@daenzer.net> ---
Fixed in LLVM SVN r263441.

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