Serial callbacks with STM327H7 panic

[frmdstryr]

Description

Any attempt to use serial callbacks do not work. Using serial without callbacks work fine.

• What target does this relate to?
  NUCLEO-H743ZI

• What toolchain (name + version) are you using?
  mbed-os-5.4.0-rc1-15146-gb0073bb70d

• What tools (name + version - is it mbed-cli, online compiler or IDE) are you using?
  mbed-cli 1.10.0

• What is the SHA of Mbed OS (git log -n1 --oneline)?
  b0073bb70d (HEAD -> master, origin/master, origin/HEAD) Merge pull request #10774 from fkjagodzinski/fix-uart_irq

• Steps to reproduce.

Use this code

#include "mbed.h"

DigitalOut led1(LED1);
DigitalOut led2(PE_1); // LED2 is PE_1 on v2 of this board
DigitalOut led3(LED3);
Serial serial(USBTX, USBRX, 115200);

void on_data() {
    led1 = !led1;
    while (serial.readable()) {
        serial.putc(serial.getc());
    }
}

int main() {
    serial.attach(&on_data);

    while (1) {
        led2 = !led2;
        led3 = !led3;
        wait(0.5);
    }
}

Open the port and an send any character. It will dump this error

++ MbedOS Error Info ++
Error Status: 0x80010133 Code: 307 Module: 1
Error Message: Mutex: 0x200019A4, Not allowed in ISR context
Location: 0x8002587
Error Value: 0x200019A4
Current Thread: rtx_idle  Id: 0x20001264 Entry: 0x8002595 StackSize: 0x300 StackMem: 0x200015A8 SP: 0x2001FEB8 
For more info, visit: https://mbed.com/s/error?error=0x80010133&tgt=NUCLEO_H743ZI
-- MbedOS Error Info --

= System will be rebooted due to a fatal error =
= Reboot count(=1) reached maximum, system will halt after rebooting 

Edit: It appears to be similar to #3452

Issue request type

[ ] Question
[ ] Enhancement
[X] Bug

[0xc0170]

Similar to this one #10906, use RawSerial

[frmdstryr]

Thanks, that works!

If I remove the while loop it seems to keep calling the irq in a loop, why is this?