A couple of days ago, WhatsApp users on Android found an unpleasant bug. When sending a smiley as a black dot through the messenger, the device started to terribly buggy and eventually hung up. It helped reboot.
It turned out that the problem affected and users of iOS devices. When you send the same symbol of the black dot, iPhone and iPad, running under iOS 11.3 and iOS 11.4, behave inadequately.
That very combination of symbols with a black dot:
The reason for this behavior of the device is that under the harmless smiley are hidden thousands of hidden Unicode characters, which load the processor of the mobile device.
As a result, when you try to read a sent message that contains such a black dot, the smartphone hangs. Curiously, the bug also appears when sending a smile to the Mac. Immediately after receiving the symbol, system monitoring shows a sharp increase in the consumption of RAM, the swap file and the CPU power consumption.
It seems that Apple is aware of this problem. We hope that in the near future iOS 11 update developers will close this bug. [ 9to5 ]