https://bugs.freedesktop.org/show_bug.cgi?id=110422

            Bug ID: 110422
           Summary: AMD_DEBUG=forcedma will crash OpenGL aps with SIGFAULT
                    on VegaM 8706G
           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: phusho@yahoo.com
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 143966
  --> https://bugs.freedesktop.org/attachment.cgi?id=143966&action=edit
Unigen Heaven same command

DRI_PRIME=1 AMD_DEBUG=forcedma glxinfo

[26320.370012] amdgpu 0000:01:00.0: GPU pci config reset
[26332.450816] [drm] PCIE GART of 256M enabled (table at 0x000000F400000000).
[26332.574698] [drm] UVD and UVD ENC initialized successfully.
[26332.684628] [drm] VCE initialized successfully.
[26332.747280] glxinfo[28470]: segfault at 0 ip 0000000000000000 sp
00007fff9ef92e08 error 14 in glxinfo[56271c220000+c000]
[26332.747284] Code: Bad RIP value.

but same command with glxgears work correct.
Unigen will crash also

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