Latest STM32CUBE IDE problems. Malloc() failure.

I upgraded to STM32CUBE IDE v1.5 few days ago, then strange problems began to appear.

Suddenly, code that previously worked on v1.3, doesn't. No major changes.

The program uses a some dynamic memory allocation, so to debug the free memory, I use this routine.

It allocates adding 100 byte blocks. I know it's not perfect, but it gives me a idea of the memory usage.

It worked well last time I used it, 2 weeks ago, allocating 10K of ram before and 2K after the program initialization.

Now the malloc always returns a valid pointer, and the allocation value increases without control until it triggers a HardFault.

__attribute__((optimize("O0")))	// Disable all optimizations
uint16_t freeram(void){
 uint16_t ram=100;		// Start with 100 byte allocation
 uint8_t* ptr;			// Pointer for malloc function
 while(1){
 ptr=malloc(ram);		// Try to malloc 'ram' bytes
 if(ptr==NULL){		// If null pointer
 return (ram-100);	// Return previous ram value
 }
 else{			// If not null
 free(ptr);		// Free up the allocated memory
 ram+=100;		// Increase allocation size
 }
 }
}