#203 Crash in prvProcessSimulatedInterrupts() in Windows port

[Jaroslav Fojtik]

I have found a crash in Windows port of FreeRTOS in port.c

I have found that pxCurrentTCB is NULL

/* Obtain the state of the task now selected to enter the
                Running state. */
                pxThreadState = ( ThreadState_t * ) ( *( size_t *) pxCurrentTCB );

Callstack:

>   plugin_AeroSIMRC.dll!prvProcessSimulatedInterrupts()  Line 496 + 0x5 bytes  C
    plugin_AeroSIMRC.dll!xPortStartScheduler()  Line 362    C
    plugin_AeroSIMRC.dll!vTaskStartScheduler()  Line 1084   C

The proposed fix:

if(pxCurrentTCB != NULL)
                {
                  /* Obtain the state of the task now selected to enter the
                  Running state. */
                  pxThreadState = ( ThreadState_t * ) ( *( size_t *) pxCurrentTCB );

                  /* pxThreadState->pvThread can be NULL if the task deleted
                  itself - but a deleted task should never be resumed here. */
                  configASSERT( pxThreadState->pvThread != NULL );
                  ResumeThread( pxThreadState->pvThread );
                }

[Jaroslav Fojtik]

Please note that this crash was not immediate. It occurred after one hour of FreeRTOS app run.

I have investigated this problem and it might be a side effect of calling xSemaphoreGiveFromISR() from non FreeRTOS thread. I needed to simulate IRQ from something that cannot belong to FreeRTOS thread chunk.

[Gaurav Aggarwal]

I moved your question to our support forum - https://forums.freertos.org/t/crash-in-windows-port/15687

Going forward please use FreeRTOS support forums - https://forums.freertos.org/

Thanks.