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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