Serial LTE Modem application (nRF Connect SDK) crashes during SoftSIM DEINIT

[MirkoCovizzi]

Hi,

we are currently encountering a problem where when issuing a CFUN=0 after a CFUN=1 the application core will reboot due to a crash in the DEINIT switch case, in particular while executing the deinit_fs function.

To reproduce the bug, checkout the branch https://github.com/MirkoCovizzi/nrf-softsim/tree/deinit-crash, point the manifest to west.yml and do a west update. This will pull the NCS branch https://github.com/MirkoCovizzi/sdk-nrf/tree/deinit-crash that contains the application (currently WIP) https://github.com/MirkoCovizzi/sdk-nrf/tree/deinit-crash/applications/serial_lte_modem_softsim.

To build the application:

• Go to the application directory: applications/serial_lte_modem_softsim
• Execute: west build -b nrf9160dk_nrf9160_ns -- -DOVERLAY_CONFIG=overlay-onomondo.conf

To test the application:

• Open a serial terminal to UART0
• Check that upon boot the application will output the string Ready
• Issue the following command into the serial terminal: AT+CFUN=1
• Issue the following command into the serial terminal: AT+CFUN=0
• Observe that the application will reboot, showing the string Ready

To show that the deinit_fs function is the culprit, checkout https://github.com/MirkoCovizzi/nrf-softsim/tree/deinit-no-crash and repeat the steps above. Observe that after executing the same steps, the application will not reboot due to a crash (will not output the string Ready) after the specific sequence of AT commands.

[peterbornerup]

I believe this is fixed in the newest release v2.2.1

We had an old free not changed to use k_free. It's been changed to use the SS_FREE macro now.

[MirkoCovizzi]

@peterbornerup Thanks Peter, looks like it fixes the issue. Best regards.