STM32Cube CMSIS_OSv2-FreeRTOS with check_for_stack_overflow hard faults during idle task creation.

I'm getting a hard during the idle task creation of a minimal out-of-the-box cmsis-osv2-freertos project.

Setup:

• STM32CubeIDE version 1.1.0
• STM32Cube FW_F1 V1.8.0
• STM32 project
• MCU is STM32F103C8Tx
• Configuration:
  • System Core --> Sys
    • Debug = serial wire
    • Timebase source = TIM4
  • Middleware --> FreeRTOS
    • CMSIS V2 interface
  • Compiler settings: set language standards to GNU C++ 14 and GNU C 11
• Everything else is default. No code modifications.

Compiling and running the project on target results in a hard fault during creation of the idle task. Memory in the stack is being corrupted by the memset call at:

Thread #1 [main] 1 [core: 0] (Suspended : Breakpoint) 
 prvInitialiseNewTask() at tasks.c:847 0x8002252 
 xTaskCreateStatic() at tasks.c:615 0x80021a4 
 vTaskStartScheduler() at tasks.c:1,909 0x80024ce 
 osKernelStart() at cmsis_os2.c:207 0x80013d0 
 main() at main.c:129 0x8000194 
 Reset_Handler() at startup_stm32f103c8tx.s:97 0x8000482

Variables:

pxTaskCode TaskFunction_t 0x8002b69 <prvIdleTask> 
pcName const char * const 0x8003cf4 "IDLE" 
ulStackDepth const uint32_t 128 
pvParameters void * const 0x0 
uxPriority UBaseType_t 0 
pxCreatedTask TaskHandle_t * const 0x20000168 <Idle_Stack+220> 
pxNewTCB TCB_t * 0x20000030 <Idle_TCB> 
xRegions const MemoryRegion_t * const 0x0 
pxTopOfStack StackType_t * 0x20000da0 <ucHeap+132> 
x UBaseType_t 536874416

This results a hard fault in the next executable line:

prvInitialiseNewTask() at tasks.c:857 0x8002262

Variables:

pxTaskCode TaskFunction_t 0xa5a5a5a5 
pcName const char * const 0xa5a5a5a5 <error: Cannot access memory at address 0xa5a5a5a5> 
ulStackDepth const uint32_t 2779096485 
pvParameters void * const 0xa5a5a5a5 
uxPriority UBaseType_t 2779096485 
pxCreatedTask TaskHandle_t * const 0xa5a5a5a5 
pxNewTCB TCB_t * 0xa5a5a5a5 
xRegions const MemoryRegion_t * const 0xa5a5a5a5 
pxTopOfStack StackType_t * 0xa5a5a5a5 
x UBaseType_t 2779096485

This feels like the problem is with the configMINIMAL_STACK_SIZE parameter controlling the stack depth, but the units of 128 words seem to be consistent from Idle_Stack through the memset.

When I switch the project to cmsis_osv1, it runs without problems. BUT tskSET_NEW_STACKS_TO_KNOWN_VALUE is unset by default. Setting check for stack overflow to option 2 enables the memset and the same corruption occurs.

Any suggestions? Did I miss a configuration step?

Thanks,

Ben