Hero2lte : Migration nougat -> oreo : Torch don't work

• /e/ version: (testing migration to oreo) e-0.7-o-2020031645459-dev-hero2lte
• Device model: samsung s7 edge
• When it started to occur: always
• Reproducible with the last /e/ version: no problem with the nougat version
• Reproducible with LineageOS: don't know

Summary

Testing migration from nougat to oreo : Fresh install

• The bug concerns a third party app
• The bug a big waste of time (torch is very useful ...)

The problem

Steps to reproduce Open the top down menu, enable torch. Torch don't work

Technical informations

Relevant logs (adb logcat)

04-04 11:18:01.576  3464  3464 W HwBinder:3464_1: type=1400 audit(0.0:44): avc: denied { write } for name="rear_torch_flash" dev="sysfs" ino=24857 scontext=u:r:hal_camera_default:s0 tcontext=u:object_r:camera_device:s0 tclass=file permissive=0
04-04 11:18:01.584  3464  3694 I ExynosCamera3Interface: INFO(HAL_set_torch_mode[584]):in =====
04-04 11:18:01.584  3464  3694 I ExynosCamera3Interface: INFO(HAL_set_torch_mode[604]): Current Camera State (state = 3)
04-04 11:18:01.585  3464  3694 I ExynosCamera3Interface: INFO(control_torch_flash[544]):flashFilePath(/sys/class/camera/flash/rear_torch_flash)
04-04 11:18:01.585  3487  5104 D audio_route: Apply path: speaker
04-04 11:18:01.585  3464  3694 E ExynosCamera3Interface: ERR(control_torch_flash[549]):torch file open(/sys/class/camera/flash/rear_torch_flash) fail, ret(0)
04-04 11:18:01.586  3480  3705 I CameraProviderManager: Camera device device@1.0/legacy/0 torch status is now AVAILABLE_ON
04-04 11:18:01.586  3480  3705 I CameraService: onTorchStatusChangedLocked: Torch status changed for cameraId=0, newStatus=2
04-04 11:18:01.588  3480  3705 I CameraProviderManager: Camera device device@3.3/legacy/0 torch status is now AVAILABLE_ON
04-04 11:18:01.588  3480  3705 I CameraService: onTorchStatusChangedLocked: Torch status changed for cameraId=0, newStatus=2
04-04 11:18:01.589  3464  3694 I ExynosCamera3Interface: INFO(HAL_set_torch_mode[638]):out =====
04-04 11:18:01.589  3464  3694 D ExynosCamera3Interface: DEBUG:duration time(    5 msec):(HAL_set_torch_mode)
04-04 11:18:04.634  3633  3715 D SensorService: [SO] 3.405 5.519 7.133