#define LOS_ERRNO_MUX_ALL_BUSY   LOS_ERRNO_OS_ERROR(LOS_MOD_MUX, 0x03)

Mutex error code: No mutex is available and the mutex request fails.

Value: 0x02001d03

Solution: Increase the number of mutexes defined by LOSCFG_BASE_IPC_MUX_LIMIT.

在文件los_mux.h92行定义。