[Bug 102009] Blender crashes when compiling OpenCL kernel

[Bug 102009] Blender crashes when compiling OpenCL kernel

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=102009

            Bug ID: 102009
           Summary: Blender crashes when compiling OpenCL kernel
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: mw@graph-ix.net
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 133182
  --> https://bugs.freedesktop.org/attachment.cgi?id=133182&action=edit
Blender crash dump

On Ubuntu 17.04 with a AMD Radeon R9 380 (Tonga Pro chipset), daily Mesa from
Padoka PPA (version 1:17.3~git170731230100.df61a05~z~padoka0), both Blender
2.78 and 2.79 daily build (09eac0159db) crash when the OpenCL kernel is
compiled for GPU rendering.


Steps to reproduce:
1. Start Blender with `CYCLES_OPENCL_SPLIT_KERNEL_TEST=1 ./blender` due to
missing detection of OpenCL support (probably due to #101594).
2. Under Render settings, switch `Device` to `GPU Compute` and assert this
setting is actually used.
3. Start a render and assert the OpenCL kernel is compiled.

Actual behavior:
* Blender crashes during kernel compilation (crash dump of 2.79 build is
attached).

Expected behavior:
* Blender renders with OpenCL.

Addtional info:
* `clinfo` and `glxinfo` output is attached as well.

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[Bug 102009] Blender crashes when compiling OpenCL kernel

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https://bugs.freedesktop.org/show_bug.cgi?id=102009

--- Comment #1 from Markus <mw@graph-ix.net> ---
Created attachment 133183
  --> https://bugs.freedesktop.org/attachment.cgi?id=133183&action=edit
glxinfo

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[Bug 102009] Blender crashes when compiling OpenCL kernel

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[-- Attachment #1.1: Type: text/plain, Size: 291 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=102009

--- Comment #2 from Markus <mw@graph-ix.net> ---
Created attachment 133184
  --> https://bugs.freedesktop.org/attachment.cgi?id=133184&action=edit
clinfo

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[Bug 102009] Blender crashes when compiling OpenCL kernel

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https://bugs.freedesktop.org/show_bug.cgi?id=102009

Jan Vesely <jan.vesely@rutgers.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |99553


Referenced Bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=99553
[Bug 99553] Tracker bug for runnning OpenCL applications on Clover
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[Bug 102009] Blender crashes when compiling OpenCL kernel

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https://bugs.freedesktop.org/show_bug.cgi?id=102009

--- Comment #3 from Jan Vesely <jan.vesely@rutgers.edu> ---
the stacktrace does not say much, and it's not similar to segfault I see on my
machine. Can you repost the stacktrace with mesa debug information?

thanks

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[Bug 102009] Blender crashes when compiling OpenCL kernel

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 314 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=102009

--- Comment #4 from Markus <mw@graph-ix.net> ---
Created attachment 134599
  --> https://bugs.freedesktop.org/attachment.cgi?id=134599&action=edit
gdb Stacktrace - Ubuntu 17.10

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[Bug 102009] Blender crashes when compiling OpenCL kernel

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 307 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=102009

--- Comment #5 from Markus <mw@graph-ix.net> ---
Created attachment 134600
  --> https://bugs.freedesktop.org/attachment.cgi?id=134600&action=edit
glxinfo - Ubuntu 17.10

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[Bug 102009] Blender crashes when compiling OpenCL kernel

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 306 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=102009

--- Comment #6 from Markus <mw@graph-ix.net> ---
Created attachment 134601
  --> https://bugs.freedesktop.org/attachment.cgi?id=134601&action=edit
clinfo - Ubuntu 17.10

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[Bug 102009] Blender crashes when compiling OpenCL kernel

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https://bugs.freedesktop.org/show_bug.cgi?id=102009

--- Comment #7 from Markus <mw@graph-ix.net> ---
I tried to obtain debug information from Mesa but was unable to do so (i.e.
starting Blender with `MESA_DEBUG=context CYCLES_OPENCL_SPLIT_KERNEL_TEST=1
./blender` did not generate any visible debug information).

What I did instead, is run Blender via gdb which then gave the attached stack
trace at the time of crash. Looking at the trace, it appears like the crash is
inside LLVM.

What is the best way to debug this further?

P.S.: As I just updated to Ubuntu 17.10 (Beta 2), I've also attached new
glxinfo and clinfo output.

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[Bug 102009] Blender crashes when compiling OpenCL kernel

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https://bugs.freedesktop.org/show_bug.cgi?id=102009

--- Comment #8 from Jan Vesely <jan.vesely@rutgers.edu> ---
(In reply to Markus from comment #7)
> I tried to obtain debug information from Mesa but was unable to do so (i.e.
> starting Blender with `MESA_DEBUG=context CYCLES_OPENCL_SPLIT_KERNEL_TEST=1
> ./blender` did not generate any visible debug information).
> 
> What I did instead, is run Blender via gdb which then gave the attached
> stack trace at the time of crash. Looking at the trace, it appears like the
> crash is inside LLVM.
> 
> What is the best way to debug this further?
> 
> P.S.: As I just updated to Ubuntu 17.10 (Beta 2), I've also attached new
> glxinfo and clinfo output.

you can use CLOVER_DEBUG=clc,llvm,native CLOVER_DEBUG_FILE=blender
to force clover to dump compiled CL programs (it should produce several dump
files for .clc .ll .asm). Make sure the kernels are compiled and not loaded
fomr ~/.cache/cycles/kernels
>From there you can run and debug LLVM on the command line.

Note that I have been unable to reproduce this.
blender-2.79 on
OpenCL 1.1 Mesa 17.4.0-devel (git-138adc72e7)
AMD Radeon R7 Graphics (CARRIZO / DRM 3.18.0 / 4.11.0-ROC-SC, LLVM 5.0.1)
AMD Radeon (TM) R7 M340 (ICELAND / DRM 3.18.0 / 4.11.0-ROC-SC, LLVM 5.0.1)

instead it hits MAX_GLOBAL_BUFFERS assertion in radeonsi pipe driver.
bumping the limit renders a picture albeit much different from CPU rendering

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[Bug 102009] [clover, amdgcn] Blender crashes when compiling OpenCL kernel

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https://bugs.freedesktop.org/show_bug.cgi?id=102009

Jan Vesely <jan.vesely@rutgers.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Blender crashes when        |[clover, amdgcn] Blender
                   |compiling OpenCL kernel     |crashes when compiling
                   |                            |OpenCL kernel

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[Bug 102009] [clover, amdgcn] Blender crashes when compiling OpenCL kernel

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https://bugs.freedesktop.org/show_bug.cgi?id=102009

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|dri-devel@lists.freedesktop |mesa-dev@lists.freedesktop.
                   |.org                        |org
         QA Contact|dri-devel@lists.freedesktop |mesa-dev@lists.freedesktop.
                   |.org                        |org
          Component|Drivers/Gallium/radeonsi    |Gallium/StateTracker/Clover

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