Okay, I need to classify this bug report as either user-mode or system-mode related. Let's look at the details. The problem occurs when running a Cortex-M firmware using QEMU. The issue is triggered by an IT instruction in Thumb mode, which causes a TCG debug assertion failure. Cortex-M processors are typically used in embedded systems and run in a single privileged level without user and kernel modes like higher-end ARM cores. So the code being executed here is likely at the highest privilege level, not a user application. The error happens within QEMU's TCG (Translation Control Gadget) when handling an IT block. This suggests it's related to how the emulator translates Thumb instructions into intermediate code for execution. Since this involves low-level instruction translation and exception handling (like BusFault), it seems like a problem in system-mode where the processor is in its normal operational state, not running user space applications. Peripherals and device interactions are mentioned in additional info, but the main issue is with the IT instruction causing an assertion, which relates to core CPU functionality rather than specific hardware emulation. Therefore, this bug is more aligned with system-mode operations within QEMU. system