raiden00pl opened a new pull request, #20871:
URL: https://github.com/apache/nuttx/pull/20871
## Summary
d20189bdfa2 made up_exit() and the ARMv6-M arm_sigdeliver() set
g_running_tasks to NULL before SYS_restore_context, so that the ARMv6-M
arm_doirq() skips saving the registers into it. That NULL is passed to
nxsched_switch_context(), which dereferences it; with tickless
round-robin this locked up the STM32F0.
d20189bdfa2 replaced the check of the SVCall number and R0, because on
ARMv6-M the SVC arrives as HardFault when issued with PRIMASK set
(ARMv6-M ARM, DDI 0419E, B1.5.4). Restore that check, accepting SVCall
and HardFault, and remove the NULL from up_exit() and arm_sigdeliver().
## Impact
bug fix
## Testing
NUCLEO-F091RC (Cortex-M0) and NUCLEO-U083RC (Cortex-M0+) with systick and
tickless
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