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MGD changes behavior of my Vulkan app and crashes

Lorenzo Dal Col

Hello,

I am trying to get Mali Graphics Debugger v4.8 to trace my Vulkan application on a rooted Samsung Galaxy S7 (Exynos) but it is causing the application to crash. The application is running correctly without MGD, I have turned the Android validation layers on and no error or serious warning is displayed.

If I start it with MGD tracing, it causes the error:

ERROR: [IMAGE] Code 710936520 : vkGetImageSubresourceLayout():
Image must have tiling of VK_IMAGE_TILING_LINEAR. The spec valid usage text states
'image must have been created with tiling equal to VK_IMAGE_TILING_LINEAR'
(https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#VUID-vkGetImageSubresourceLayout-image-00996)

to appear, and the application to crash afterwards.

I had to include libMGD.so in my APK libs and also rename it to libVkLayer_MGD.so to make it work.

Are there limitations in the way MGD handles Vulkan images?

Here's the crash report:

8414-8414/? A/DEBUG: *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
8414-8414/? A/DEBUG: Build fingerprint: 'samsung/heroltexx/herolte:7.0/NRD90M/G930FXXU1DQCG:user/release-keys'
8414-8414/? A/DEBUG: Revision: '8'
8414-8414/? A/DEBUG: ABI: 'arm64'
8414-8414/? A/DEBUG: pid: 8296, tid: 8348, name: stscene.classic  >>> virtualarts.testscene.classic <<<
8414-8414/? A/DEBUG: signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0
8414-8414/? A/DEBUG:     x0   0000000000000025  x1   00000075f9984088  x2   0000000000000000  x3   00000075f9984050
8414-8414/? A/DEBUG:     x4   00000075f9984050  x5   0000000000000000  x6   000000760976b000  x7   0000000000000000
8414-8414/? A/DEBUG:     x8   0000000000000006  x9   0000000000000000  x10  00000075e033f980  x11  0000000000000000
8414-8414/? A/DEBUG:     x12  00000075e0341820  x13  00000003e8000000  x14  0000000000000000  x15  00164aee3d780d3e
8414-8414/? A/DEBUG:     x16  00000075e07a3948  x17  00000076087fc01c  x18  0000000000000000  x19  00000075f9984088
8414-8414/? A/DEBUG:     x20  0000007604fa6800  x21  0000000000000001  x22  0000000000000001  x23  0000000000000000
8414-8414/? A/DEBUG:     x24  0000000000000037  x25  00000075f32760c0  x26  0000000000000025  x27  00000000094006d8
8414-8414/? A/DEBUG:     x28  00000076087fb124  x29  00000075f9983660  x30  00000075e050acc8
8414-8414/? A/DEBUG:     sp   00000075f9983540  pc   00000075e050ae68  pstate 0000000060000000
8414-8414/? A/DEBUG: backtrace:
8414-8414/? A/DEBUG:     #00 pc 00000000000d9e68  /data/app/virtualarts.testscene.classic-1/lib/arm64/libVkLayer_core_validation.so
8414-8414/? A/DEBUG:     #01 pc 0000000000017ea8  /data/app/virtualarts.testscene.classic-1/lib/arm64/libVkLayer_threading.so
8414-8414/? A/DEBUG:     #02 pc 00000000005717f4  /data/app/virtualarts.testscene.classic-1/lib/arm64/libVkLayer_MGD.so
8414-8414/? A/DEBUG:     #03 pc 00000000005593b4  /data/app/virtualarts.testscene.classic-1/lib/arm64/libVkLayer_MGD.so
8414-8414/? A/DEBUG:     #04 pc 0000000000544b2c  /data/app/virtualarts.testscene.classic-1/lib/arm64/libVkLayer_MGD.so (vkCreateFramebuffer+80)
8414-8414/? A/DEBUG:     #05 pc 0000000000013ce0  /system/lib64/libvulkan.so
8414-8414/? A/DEBUG:     #06 pc 000000000042b658  /data/app/virtualarts.testscene.classic-1/lib/arm64/libunivrs.so (_ZN3UVR18DeviceRenderTarget17setupFramebuffersERNS_13VulkanContextEiRKNS_16DeviceRenderPassERKSt8functionIFSt6vectorIN2vk9ImageViewESaIS9_EEiEE+420)
8414-8414/? A/DEBUG:     #07 pc 0000000000373114  /data/app/virtualarts.testscene.classic-1/lib/arm64/libunivrs.so (_ZN3UVR13VulkanContext22setupSceneFramebuffersEv+484)
8414-8414/? A/DEBUG:     #08 pc 000000000036d0ec  /data/app/virtualarts.testscene.classic-1/lib/arm64/libunivrs.so (_ZN3UVR13VulkanContext13platformSetupEv+124)
8414-8414/? A/DEBUG:     #09 pc 0000000000288204  /data/app/virtualarts.testscene.classic-1/lib/arm64/libunivrs.so (_ZN16AndroidLifeCycle13CreateContextEP11android_app+268)
8414-8414/? A/DEBUG:     #10 pc 0000000000287cd4  /data/app/virtualarts.testscene.classic-1/lib/arm64/libunivrs.so (_ZN16AndroidLifeCycle17engine_handle_cmdEP11android_appi+120)
8414-8414/? A/DEBUG:     #11 pc 000000000000fdc8  /data/app/virtualarts.testscene.classic-1/lib/arm64/libmain-native-activity.so
8414-8414/? A/DEBUG:     #12 pc 00000000002886f8  /data/app/virtualarts.testscene.classic-1/lib/arm64/libunivrs.so (_ZN16AndroidLifeCycle11AppMainLoopEP11android_app+104)
8414-8414/? A/DEBUG:     #13 pc 000000000000d9b0  /data/app/virtualarts.testscene.classic-1/lib/arm64/libmain-native-activity.so (android_main+64)
8414-8414/? A/DEBUG:     #14 pc 000000000000fd5c  /data/app/virtualarts.testscene.classic-1/lib/arm64/libmain-native-activity.so
8414-8414/? A/DEBUG:     #15 pc 00000000000696bc  /system/lib64/libc.so (_ZL15__pthread_startPv+196)
8414-8414/? A/DEBUG:     #16 pc 000000000001dbf0  /system/lib64/libc.so (__start_thread+16)

Parents
  • +1

    Hi Lorenzo,

    It looks like the error reported by the validation layer references some code from the interceptor which doesn't conform to the API. But I think the code's behaviour should be harmless.

    We generally don't recommend using the validation layer with the MGD interceptor. If you disable the validation layer, does your application still crash?

Reply
  • +1

    Hi Lorenzo,

    It looks like the error reported by the validation layer references some code from the interceptor which doesn't conform to the API. But I think the code's behaviour should be harmless.

    We generally don't recommend using the validation layer with the MGD interceptor. If you disable the validation layer, does your application still crash?

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