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Thread performance checker warning #49

@VladimirBorodko

Description

@VladimirBorodko

I'm seeing runtime issue in console.

Stack trace:

Thread Performance Checker: Thread running at QOS_CLASS_USER_INITIATED waiting on a lower QoS thread running at QOS_CLASS_DEFAULT. Investigate ways to avoid priority inversions
PID: 88617, TID: 1735210
Backtrace
=================================================================
3   libPINOperation_impl.dylib          0x00000001098ea2dc __44-[PINOperationQueue scheduleNextOperations:]_block_invoke.132 + 68
4   libdispatch.dylib                   0x000000010bb2c594 _dispatch_call_block_and_release + 24
5   libdispatch.dylib                   0x000000010bb2dd5c _dispatch_client_callout + 16
6   libdispatch.dylib                   0x000000010bb36040 _dispatch_lane_serial_drain + 928
7   libdispatch.dylib                   0x000000010bb36d80 _dispatch_lane_invoke + 428
8   libdispatch.dylib                   0x000000010bb44b40 _dispatch_workloop_worker_thread + 1720
9   libsystem_pthread.dylib             0x00000001af254b40 _pthread_wqthread + 284
10  libsystem_pthread.dylib             0x00000001af253904 start_wqthread + 8

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