[Bug 102233] OpenCL segmentation fault on AMD Radeon (Kaveri+R7) with memtestCL

[Bug 102233] OpenCL segmentation fault on AMD Radeon (Kaveri+R7) with memtestCL

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https://bugs.freedesktop.org/show_bug.cgi?id=102233

            Bug ID: 102233
           Summary: OpenCL segmentation fault on AMD Radeon (Kaveri+R7)
                    with memtestCL
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: senad.jahic@gmx.com
        QA Contact: dri-devel@lists.freedesktop.org
            Blocks: 99553

Hardware:
AMD A8-7600 with Radeon™ R7 Series
Sapphire R7 240 4GB
ASUS R7 240 4GB

OS: Ubuntu server 17.04 64bit (headless mode).
OpenCL Driver: Padoka


Description:
clinfo works, shows all three GPU platforms.
Sometimes I get segmentation fault using memtestCL.
I get 100% crashes with YACMiner (crypto mining software).


I've traced memtestCL down to this line:
https://github.com/ihaque/memtestCL/blob/607499a54dcac9b846fcc827dc5980d8e5f66cec/memtestCL_cli.cpp#L126

On repeating runs, clGetDeviceIDs sometimes returns 0 for num_cpu and sometimes
1.
If it returns 1, clGetDeviceInfo later crashes when called with device id that
does not exist.

If I hardcode "num_devices=3" at offending line, I can run memtestCL on all
three devices successfully without faults.


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 102233] OpenCL segmentation fault on AMD Radeon (Kaveri+R7) with memtestCL

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https://bugs.freedesktop.org/show_bug.cgi?id=102233

--- Comment #1 from Jan Vesely <jan.vesely@rutgers.edu> ---
What is the mesa/llvm version?
can you post clinfo?
do you use ocl-icd library? if so can you run setting
OCL_ICD_VENDORS=/etc/OpenCL/vendors/mesa.icd

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[Bug 102233] OpenCL segmentation fault on AMD Radeon (Kaveri+R7) with memtestCL

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https://bugs.freedesktop.org/show_bug.cgi?id=102233

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

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[Bug 102233] OpenCL segmentation fault on AMD Radeon (Kaveri+R7) with memtestCL

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https://bugs.freedesktop.org/show_bug.cgi?id=102233

--- Comment #2 from Jan Vesely <jan.vesely@rutgers.edu> ---
Can you try initializing the num_gpu, num_cpu, num_accel variables?
clGetDeviceIDs returns CL_DEVICE_NOT_FOUND error if there are no devices
matching the requested type. This does not set num_devices output parameter to
0.

Unless the variables are initialized to 0, the loop on line 135 accesses devids
array out of bounds.

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[Bug 102233] OpenCL segmentation fault on AMD Radeon (Kaveri+R7) with memtestCL

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https://bugs.freedesktop.org/show_bug.cgi?id=102233

--- Comment #3 from Jan Vesely <jan.vesely@rutgers.edu> ---
(In reply to Senad from comment #0)
> I get 100% crashes with YACMiner (crypto mining software).

please report a separate bug for YACMiner

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[Bug 102233] OpenCL segmentation fault on AMD Radeon (Kaveri+R7) with memtestCL

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https://bugs.freedesktop.org/show_bug.cgi?id=102233

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |NOTOURBUG
             Status|NEEDINFO                    |RESOLVED

--- Comment #4 from Jan Vesely <jan.vesely@rutgers.edu> ---
This PR should fix memtestCL:
https://github.com/ihaque/memtestCL/pull/9

feel free to reopen if you still see the problem.

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