Development tools for Zephyr on STM32Workbench for Zephyr: VS Code extension to set up, build, flash and debug Zephyr applications on STM32.Devicetree manager: browse, edit and visualize Zephyr devicetree, STM32CubeMX-like for Zephyr.
I've found out the issue; the setup doesn't behave well before the RTOS scheduler is started (i.e. in main). I've modified gdb to halt at the first task and not at main and now it's working. Can openOCD work before the scheduler is started?