iOS 12-only QuartzCore crash on com.apple.coremedia.player.async

Question

I've got a crash report on QuartzCore, which seems to only happened on iOS 12. It crashed on com.apple.coremedia.player.async.

I've found several similar reports on Apple Developer Forums, but there is no solution provided yet.

Here is the full stack trace (iOS 12.0.1) :

Crashed: com.apple.coremedia.player.async.0x283b5c240
0  QuartzCore                     0x18f8ad578 X::Ref<CA::Shape>::operator=(CA::Shape*) + 20
1  QuartzCore                     0x18f8ad434 CABackingStoreGetFrontTexture(CABackingStore*, CGColorSpace*) + 348
2  QuartzCore                     0x18f8ad2a8 CABackingStoreRetainFrontTexture + 48
3  QuartzCore                     0x18f9d4e54 -[CALayer(CALayerPrivate) _copyRenderLayer:layerFlags:commitFlags:] + 676
4  QuartzCore                     0x18f9da9e4 CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 448
5  QuartzCore                     0x18f9da928 CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 260
6  QuartzCore                     0x18f9da928 CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 260
7  QuartzCore                     0x18f9da928 CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 260
8  QuartzCore                     0x18f9da928 CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 260
9  QuartzCore                     0x18f9da928 CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 260
10 QuartzCore                     0x18f9da928 CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 260
11 QuartzCore                     0x18f9da928 CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 260
12 QuartzCore                     0x18f9da928 CA::Layer::commit_if_needed(CA::Transaction*, void (*)(CA::Layer*, unsigned int, unsigned int, void*), void*) + 260
13 QuartzCore                     0x18f92e528 CA::Context::commit_transaction(CA::Transaction*) + 3240
14 QuartzCore                     0x18f95c2f4 CA::Transaction::commit() + 608
15 MediaToolbox                   0x18fe4d300 remoteXPCPlayer_setClientVideoLayerArray + 1284
16 MediaToolbox                   0x18fe4c598 remoteXPCPlayer_SetProperty + 340
17 MediaToolbox                   0x18fdb362c playerasync_runOneCommand + 1876
18 MediaToolbox                   0x18fdb63d0 playerasync_runAsynchronousCommandOnQueue + 172
19 libdispatch.dylib              0x18ae20484 _dispatch_client_callout + 16
20 libdispatch.dylib              0x18adc7c18 _dispatch_lane_serial_drain$VARIANT$mp + 592
21 libdispatch.dylib              0x18adc8794 _dispatch_lane_invoke$VARIANT$mp + 484
22 libdispatch.dylib              0x18adcfa60 _dispatch_root_queue_drain + 376
23 libdispatch.dylib              0x18adcf7e0 _dispatch_worker_thread + 284
24 libsystem_pthread.dylib        0x18b0012fc _pthread_body + 128
25 libsystem_pthread.dylib        0x18b00125c _pthread_start + 48
26 libsystem_pthread.dylib        0x18b004d08 thread_start + 4

I have absolutely no clue to determine where it could come from. The crash log suggests that it could come from video, and my app contains a Youtube Player, so it may be related.

Does anybody have an idea ? Please tell me if you need additional information.