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The problem is still present on Beta 3The system call open on the /dev return -1 and errno 16The device is a FT232R USB UART (Vendor FTDI)The source code to reproduce my issue on my usb serial#include #include #include #include #include #include int main(int argc, char **argv) { char file[] = "/dev/tty.usbserial-A600QJHB"; int fd = open(file, 0x20006, 0x0); if (fd == -1) { printf("Cannot open device %s errno %d\n", file, errno); return -1; } printf("success\n"); clode(fd); return 0; }On Catalina 10.15 I have the display ofSuccesson 10.15.1 BetaCannot open device /dev/tty.usbserial-A600QJHB errno 16 (Device in use)The device is not in use.The console log:On 10.15par défaut 09:30:00.056107+0200 kernel IOUserSerial::call0(allocResources) ==>par défaut 09:30:00.056118+0200 kernel IOUserSerial::call0() locklevel = 1par défaut 09:30:00.056212+0200 kernel IOUserSerial::<private>: 527 0x600003500058par défaut 09:30:00.056277+0200 kernel IOUserSerial::<private>: 57 0x600003500058par défaut 09:30:00.057142+0200 kernel IOUserSerial::call0() <== 0par défaut 09:30:00.057151+0200 kernel IOUserSerial::call0(hwProgramMCR) ==>par défaut 2019-10-.05715325 09:30:00+0200 kernel IOUserSerial::call0() locklevel = 1par défaut 09:30:00.057467+0200 kernel IOUserSerial::call0() <== 0par défaut 09:30:00.057471+0200 kernel IOUserSerial::call0(hwActivate) ==>par défaut 09:30:00.057472+0200 kernel IOUserSerial::call0() locklevel = 1par défaut 09:30:00.057506+0200 kernel IOUserSerial::<private>: 546 0x600003500058par défaut 09:30:00.057508+0200 kernel IOUserSerial::<private>: 117 0x600003500058par défaut 09:30:00.058573+0200 kernel IOUserSerial::call0() <== 0par défaut 09:30:00.058581+0200 kernel IOUserSerial::call0(hwResetFIFO) ==>par défaut 09:30:00.058583+0200 kernel IOUserSerial::call0() locklevel = 1On 10.15.1par défaut 00:28:31.295445-0700 kernel IOUserSerial::call0(allocResources) ==>par défaut 00:28:31.295501-0700 kernel IOUserSerial::call0() locklevel = 1par défaut 00:28:31.296030-0700 kernel IOUserSerial::call0() <== e00002bfpar défaut 00:28:31.296044-0700 kernel IOUserSerial::call0(freeResources) ==>par défaut 00:28:31.296046-0700 kernel IOUserSerial::call0() locklevel = 1par défaut 00:28:31.296238-0700 kernel IOUserSerial::call0() <== e00002bf

I performed a rollback to beta 2, waiting for the beta 4 and I hope that this issue will be fixed.

I have the same issue on iPhone 7. My phone is always warm and the battery is draining very fast. It seems that it has an issue in safari. I used it 23mn and it takes 20% of battery, in the same time I used a game for 3h2mn and it takes only 17%

Additional information to reproduce the bugDeclare an UITableVieewController, the TableView must be configured in static mode, with 3 sections. For each section declare only one cell.For each UITableViewCell in the containing View I add a UITextField. So you have now 3 UITextField for each cell attached to an IBOutlet in the codeIn the ViewDidLoad for the controller call becomeFirstResponder on one of the UITextField. on Simulator or iOS 12 this code is working. On ios 13 beta it crashes only on physical device.