iOS app crash when device rotate... [UE 4.19 ~ 4.21]

[sangpan_On]

Crate blank project with UE 4.19 and set available all orientation.

launch on iphone. (ipad has no crash.)
after splash screen,
rotate 90 degree
portrait -> landscpae -> portrait -> landscpae … or landscape -> portrait -> … repeat.

then crash with some log (my device is iphone 5s)

2018-05-03 16:19:59.583399+0900 blankProject419[3188:1029434] [2018.05.03-07.19.59:583][222]LogRenderer: Reallocating scene render targets to support 1136x1136 Format 2 NumSamples 1 (Frame:224).
2018-05-03 16:19:59.614461+0900 blankProject419[3188:1029434] [2018.05.03-07.19.59:614][223]LogRenderer: Reallocating scene render targets to support 1136x640 Format 2 NumSamples 1 (Frame:225).
2018-05-03 16:20:05.089278+0900 blankProject419[3188:1029434] [2018.05.03-07.20.05:089][385]LogRenderer: Reallocating scene render targets to support 1136x1136 Format 2 NumSamples 1 (Frame:388).
2018-05-03 16:20:05.109205+0900 blankProject419[3188:1029434] [2018.05.03-07.20.05:109][386]LogRenderer: Reallocating scene render targets to support 640x1136 Format 2 NumSamples 1 (Frame:389).
2018-05-03 16:20:08.395910+0900 blankProject419[3188:1029419] Execution of the command buffer was aborted due to an error during execution. Caused GPU Hang Error (IOAF code 3)

Is anybody suffer this rotation crash problem?
or is it just me?

It was fine until UE 4.18 .

[sangpan_On]

reproduce on 4.21.0 Preview version .

only iphone not ipad.

Landscape -> portrait is OK.
portrait -> Landscape is Crash.

and on 4.20.3
some iphone (5s) has crash problem when few time rotate device.( portrait → Landscape → portrait repeat…)

[aussieburger]

you should report this here: Unreal Engine Community

[Kafumanto]

The same in 4.21.1. Here an open issue with target fix set to 4.22: Unreal Engine Issues and Bug Tracker (UE-65091) .