Can anyone help me figure out what is going on here?
```
Firmware exited unexpectedly: Multiple
 WARN probe_rs_debug::debug_info: No reliable return address is available, so we cannot determine the program counter to unwind the previous frame.
Core 0
    Frame 0: __aeabi_memclr4 @ 0x080099e0> @ 0x00000000080099e0

    Frame 1: HardFault <Cause: Escalated UsageFault <Cause: Undefined instruction>> @ 0x08008bd0

    Frame 2: __udf @ 0x08008bd0 inline
       /home/grant/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/cortex-m-0.7.7/src/../asm/inline.rs:181:5
    Frame 3: udf @ 0x0000000008008bd0 inline
       /home/grant/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/cortex-m-0.7.7/src/call_asm.rs:11:43
    Frame 4: hard_fault @ 0x0000000008008bd0 inline
       /home/grant/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/panic-probe-1.0.0/src/lib.rs:86:5
    Frame 5: panic @ 0x0000000008008bc8
       /home/grant/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/panic-probe-1.0.0/src/lib.rs:54:9
```