thread caused non-unwinding panic. aborting. IOT instruction (core dumped)

Opening pwvucontrol shows the window for a second and then crashes with this: ``` > RUST_BACKTRACE=full pwvucontrol thread 'main' (39880) panicked at src/backend/pwnodeobject.rs:374:98: Position! stack backtrace: 0: 0x556891bf1332 - <unknown> 1: 0x556891c01cf7 - <unknown> 2: 0x556891bcc5a6 - <unknown> 3: 0x556891bd5659 - <unknown> 4: 0x556891bd54b9 - <unknown> 5: 0x556891bd589b - <unknown> 6: 0x556891bd5718 - <unknown> 7: 0x556891bd2bd9 - <unknown> 8: 0x556891bc153d - <unknown> 9: 0x556891c0a80c - <unknown> 10: 0x556891c0a0b4 - <unknown> 11: 0x556891b4d747 - <unknown> 12: 0x7f0e714a0a4c - <unknown> 13: 0x7f0e714a64f2 - <unknown> 14: 0x7f0e71611225 - <unknown> 15: 0x7f0e713aa97c - g_closure_invoke 16: 0x7f0e715dd67d - <unknown> 17: 0x7f0e714a0a4c - <unknown> 18: 0x7f0e714a64f2 - <unknown> 19: 0x7f0e715e1b24 - <unknown> 20: 0x7f0e6bfea5cf - <unknown> 21: 0x7f0e6bfe264e - <unknown> 22: 0x7f0e6bfe2d08 - <unknown> 23: 0x7f0e6c113d46 - <unknown> 24: 0x7f0e715e1726 - <unknown> 25: 0x7f0e7129ff8d - <unknown> 26: 0x7f0e712a1657 - <unknown> 27: 0x7f0e712a1865 - g_main_context_iteration 28: 0x7f0e714dc7d6 - g_application_run 29: 0x556891b9c70e - <unknown> 30: 0x556891b900b2 - <unknown> 31: 0x556891b7e793 - <unknown> 32: 0x556891b9ffe9 - <unknown> 33: 0x556891bcddb6 - <unknown> 34: 0x556891b951c5 - <unknown> 35: 0x7f0e70036635 - <unknown> 36: 0x7f0e700366e9 - __libc_start_main 37: 0x556891b2e7b5 - <unknown> 38: 0x0 - <unknown> thread 'main' (39880) panicked at library/core/src/panicking.rs:225:5: panic in a function that cannot unwind stack backtrace: 0: 0x556891bf1332 - <unknown> 1: 0x556891c01cf7 - <unknown> 2: 0x556891bcc5a6 - <unknown> 3: 0x556891bd5659 - <unknown> 4: 0x556891bd54b9 - <unknown> 5: 0x556891bd589b - <unknown> 6: 0x556891bd574a - <unknown> 7: 0x556891bd2bd9 - <unknown> 8: 0x556891bc153d - <unknown> 9: 0x556891c0a68d - <unknown> 10: 0x556891c0a60b - <unknown> 11: 0x556891c0a797 - <unknown> 12: 0x556891b4db33 - <unknown> 13: 0x7f0e714a0a4c - <unknown> 14: 0x7f0e714a64f2 - <unknown> 15: 0x7f0e71611225 - <unknown> 16: 0x7f0e713aa97c - g_closure_invoke 17: 0x7f0e715dd67d - <unknown> 18: 0x7f0e714a0a4c - <unknown> 19: 0x7f0e714a64f2 - <unknown> 20: 0x7f0e715e1b24 - <unknown> 21: 0x7f0e6bfea5cf - <unknown> 22: 0x7f0e6bfe264e - <unknown> 23: 0x7f0e6bfe2d08 - <unknown> 24: 0x7f0e6c113d46 - <unknown> 25: 0x7f0e715e1726 - <unknown> 26: 0x7f0e7129ff8d - <unknown> 27: 0x7f0e712a1657 - <unknown> 28: 0x7f0e712a1865 - g_main_context_iteration 29: 0x7f0e714dc7d6 - g_application_run 30: 0x556891b9c70e - <unknown> 31: 0x556891b900b2 - <unknown> 32: 0x556891b7e793 - <unknown> 33: 0x556891b9ffe9 - <unknown> 34: 0x556891bcddb6 - <unknown> 35: 0x556891b951c5 - <unknown> 36: 0x7f0e70036635 - <unknown> 37: 0x7f0e700366e9 - __libc_start_main 38: 0x556891b2e7b5 - <unknown> 39: 0x0 - <unknown> thread caused non-unwinding panic. aborting. zsh: IOT instruction (core dumped) RUST_BACKTRACE=full pwvucontrol```