After I compiled the CORTEX_LM3S811_GCC version of FreeRTOS, and fuzz the generated FreeRTOSDemo.bin through afl-unicorn, I got a SIGSEGV error in task.c:2813.
it seems that a malformed pxTCB cause the prvAddTaskToReadyList in function xTaskIncrementTick crash from Segmentation fault, here are the crash data and core dump information https://www.dropbox.com/s/ftilmilloeof310/crash.tar.gz?dl=0
For reproduction, run gdb RTOSDemo.axf coredump