(gdb) bt
#0  0x0000007f70121eb0 in import_exynos_ion_handles(private_handle_t*) () from /android/vendor/lib64/hw/android.hardware.graphics.mapper@4.0-impl.so
#1  0x0000007f7012054c in mali_gralloc_reference_retain(native_handle const*) () from /android/vendor/lib64/hw/android.hardware.graphics.mapper@4.0-impl.so
#2  0x0000007f70113a38 in arm::mapper::common::importBuffer(android::hardware::hidl_handle const&, std::__1::function<void (android::hardware::graphics::mapper::V4_0::Error, void*)>) () from /android/vendor/lib64/hw/android.hardware.graphics.mapper@4.0-impl.so
#3  0x0000007f70112424 in arm::mapper::GrallocMapper::importBuffer(android::hardware::hidl_handle const&, std::__1::function<void (android::hardware::graphics::mapper::V4_0::Error, void*)>) () from /android/vendor/lib64/hw/android.hardware.graphics.mapper@4.0-impl.so
#4  0x0000007f73c9ccc0 in ?? () from /android/system/lib64/android.hardware.graphics.mapper@4.0.so
#5  0x0000007f73bd2f9c in android::Gralloc4Mapper::importBuffer(android::hardware::hidl_handle const&, native_handle const**) const () from /android/system/lib64/libui.so
#6  0x0000007f702e85b8 in graphic_buffer_mapper_import_buffer_no_size () from /android/system/lib64/libui_compat_layer.so
#7  0x0000007f800dd2e0 in mir::graphics::android::HybrisGrallocImpl::importBuffer (out_handle=@0x7f808f6ca8: 0x0, raw_handle=0x7f6c004990, this=<optimized out>) at ./src/platforms/android/common/hybris_gralloc_impl.cpp:36
#8  mir::client::android::GrallocRegistrar::register_buffer (this=0x7f7c9afae0, package=..., pf=mir_pixel_format_abgr_8888) at ./src/platforms/android/client/gralloc_registrar.cpp:134
#9  0x0000007f800dc2b0 in mir::client::android::Buffer::Buffer (this=<optimized out>, registrar=..., package=..., pf=<optimized out>, this=<optimized out>, registrar=..., package=..., pf=<optimized out>) at /usr/include/c++/9/bits/shared_ptr_base.h:1020
#10 0x0000007f800dc438 in __gnu_cxx::new_allocator<mir::client::android::Buffer>::construct<mir::client::android::Buffer, std::shared_ptr<mir::client::android::BufferRegistrar> const&, MirBufferPackage&, MirPixelFormat&> (this=<optimized out>, __p=0x7f6c004520)
    at /usr/include/c++/9/bits/shared_ptr_base.h:672
#11 std::allocator_traits<std::allocator<mir::client::android::Buffer> >::construct<mir::client::android::Buffer, std::shared_ptr<mir::client::android::BufferRegistrar> const&, MirBufferPackage&, MirPixelFormat&> (__a=..., __p=0x7f6c004520)
    at /usr/include/c++/9/bits/alloc_traits.h:483
#12 std::_Sp_counted_ptr_inplace<mir::client::android::Buffer, std::allocator<mir::client::android::Buffer>, (__gnu_cxx::_Lock_policy)2>::_Sp_counted_ptr_inplace<std::shared_ptr<mir::client::android::BufferRegistrar> const&, MirBufferPackage&, MirPixelFormat&> (
    __a=..., this=0x7f6c004510) at /usr/include/c++/9/bits/shared_ptr_base.h:548
#13 std::__shared_count<(__gnu_cxx::_Lock_policy)2>::__shared_count<mir::client::android::Buffer, std::allocator<mir::client::android::Buffer>, std::shared_ptr<mir::client::android::BufferRegistrar> const&, MirBufferPackage&, MirPixelFormat&> (__a=..., 
    __p=<optimized out>, this=<optimized out>) at /usr/include/c++/9/bits/shared_ptr_base.h:679
#14 std::__shared_ptr<mir::client::android::Buffer, (__gnu_cxx::_Lock_policy)2>::__shared_ptr<std::allocator<mir::client::android::Buffer>, std::shared_ptr<mir::client::android::BufferRegistrar> const&, MirBufferPackage&, MirPixelFormat&> (__tag=..., 
    this=<optimized out>) at /usr/include/c++/9/bits/shared_ptr_base.h:1344
#15 std::shared_ptr<mir::client::android::Buffer>::shared_ptr<std::allocator<mir::client::android::Buffer>, std::shared_ptr<mir::client::android::BufferRegistrar> const&, MirBufferPackage&, MirPixelFormat&> (__tag=..., this=<optimized out>)
    at /usr/include/c++/9/bits/shared_ptr.h:359
#16 std::allocate_shared<mir::client::android::Buffer, std::allocator<mir::client::android::Buffer>, std::shared_ptr<mir::client::android::BufferRegistrar> const&, MirBufferPackage&, MirPixelFormat&> (__a=...) at /usr/include/c++/9/bits/shared_ptr.h:702
#17 std::make_shared<mir::client::android::Buffer, std::shared_ptr<mir::client::android::BufferRegistrar> const&, MirBufferPackage&, MirPixelFormat&> () at /usr/include/c++/9/bits/shared_ptr.h:718
#18 mir::client::android::AndroidClientBufferFactory::create_buffer (this=0x7f7c9b0010, package=..., size=..., pf=mir_pixel_format_abgr_8888) at ./src/platforms/android/client/android_client_buffer_factory.cpp:39