Hard crash when connecting to Code Editor using BLE over Mobile

[makermelissa]

CircuitPython version

Adafruit CircuitPython 7.0.0 on 2021-09-20; Adafruit CLUE nRF52840 Express with nRF52840

Code/REPL

[Disconnected]
[Connected]
Auto-reload is on. Simply save files over USB to run them or enter REPL to disable.

Press any key to enter the REPL. Use CTRL-D to reload.
[Disconnected]
[Connected]
Running in safe mode! Not running saved code.

You are in safe mode because:
CircuitPython core code crashed hard. Whoops!
Attempted heap allocation when VM not running.
Please file an issue with the contents of your CIRCUITPY drive at 
https://github.com/adafruit/circuitpython/issues

Press any key to enter the REPL. Use CTRL-D to reload.

Behavior

Upon pairing and connecting, while a serial terminal is connected, I get the above output.

Description

This does not happen when connecting using the Chrome Browser over MacOS

Additional information

No response

[tannewt]

What device are you testing from?

[makermelissa]

The Samsung Galaxy Tab A7 Lite.

[tannewt]

The issue is that the listdir entry struct is now 28 bytes with the uint64_t timestamp that was added. BLE packets will be 20 bytes at their smallest. The crash was due to packet buffer raising an exception when trying to write a 28 byte packet over a connection with a 20 byte packet size (MTU.)