VMs stuck at "stopping", even when --kill is used

Since the new UTM version (not sure which one, stopping of VMs seems to have become unreliable)

Command:

```sh
utmctl stop --kill
```

We're using UTM together with gitlab-runner in a custom executor (we will open-source that eventually. It's just a couple files). Before the latest update of UTM, we didn't encounter any issues. Now it seems to get stuck at stopping VMs (macOS guest)


Stopping from the UI also does not work:


Also I saw this crash on the machine:

```sh
-------------------------------------
Translated Report (Full Report Below)
-------------------------------------

Process: utmctl [26169]
Path: /Applications/UTM.app/Contents/MacOS/utmctl
Identifier: utmctl
Version: 4.6.3 (1)
Code Type: ARM-64 (Native)
Parent Process: Exited process [26168]
User ID: 0

Date/Time: 2024-12-05 22:55:18.3404 +0100
OS Version: macOS 15.1.1 (24B91)
Report Version: 12
Anonymous UUID: 6E7909AC-0630-A7E1-9F29-3BD1B73236EF

Time Awake Since Boot: 110000 seconds

System Integrity Protection: enabled

Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000

Termination Reason: Namespace SIGNAL, Code 6 Abort trap: 6
Terminating Process: utmctl [26169]

Application Specific Information:
abort() called

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x181bca600 __pthread_kill + 8
1 libsystem_pthread.dylib 0x181c02f70 pthread_kill + 288
2 libsystem_c.dylib 0x181b0f908 abort + 128
3 libc++abi.dylib 0x181bb944c abort_message + 132
4 libc++abi.dylib 0x181ba7a40 demangling_terminate_handler() + 348
5 libobjc.A.dylib 0x18184d3e4 _objc_terminate() + 156
6 libc++abi.dylib 0x181bb8710 std::__terminate(void (*)()) + 16
7 libc++abi.dylib 0x181bbbcdc __cxxabiv1::failed_throw(__cxxabiv1::__cxa_exception*) + 88
8 libc++abi.dylib 0x181bbbc84 __cxa_throw + 92
9 libobjc.A.dylib 0x181842e40 objc_exception_throw + 448
10 CoreFoundation 0x181e11638 -[NSObject(NSObject) doesNotRecognizeSelector:] + 364
11 ScriptingBridge 0x1caca4030 -[SBObject forwardInvocation:] + 116
12 CoreFoundation 0x181cc8a64 ___forwarding___ + 964
13 CoreFoundation 0x181cc85e0 _CF_forwarding_prep_0 + 96
14 utmctl 0x100fff4f0 0x100ffc000 + 13552
15 utmctl 0x1010014d8 0x100ffc000 + 21720
16 utmctl 0x101008044 0x100ffc000 + 49220
17 dyld 0x181880274 start + 2840

Thread 1:
0 libsystem_pthread.dylib 0x181bfe0e8 start_wqthread + 0

Thread 2:
0 libsystem_pthread.dylib 0x181bfe0e8 start_wqthread + 0

Thread 3:
0 libsystem_pthread.dylib 0x181bfe0e8 start_wqthread + 0

Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x0000000000000000 x1: 0x0000000000000000 x2: 0x0000000000000000 x3: 0x0000000000000000
x4: 0x0000000181bbde1b x5: 0x000000016ee02270 x6: 0x000000000000006e x7: 0x0000000000000000
x8: 0x2cb5e0818ae5e3fc x9: 0x2cb5e0806c349bbc x10: 0x0000000000000051 x11: 0x000000000000000b
x12: 0x000000000000000b x13: 0x00000001820c7e9a x14: 0x00000000001ff800 x15: 0x00000000000007fb
x16: 0x0000000000000148 x17: 0x00000001eef75850 x18: 0x0000000000000000 x19: 0x0000000000000006
x20: 0x0000000000000103 x21: 0x00000001e6d17920 x22: 0x00000001e4be4000 x23: 0x0000000000000001
x24: 0x0000000000000001 x25: 0x0000000000000068 x26: 0x000000016ee03350 x27: 0x0000000000000000
x28: 0x0000000000000000 fp: 0x000000016ee021e0 lr: 0x0000000181c02f70
sp: 0x000000016ee021c0 pc: 0x0000000181bca600 cpsr: 0x40001000
far: 0x0000000000000000 esr: 0x56000080 Address size fault

Binary Images:
0x100ffc000 - 0x10109ffff utmctl (*) /Applications/UTM.app/Contents/MacOS/utmctl
0x181bc1000 - 0x181bfbff7 libsystem_kernel.dylib (*) <9fea25a4-e8ca-3f3d-901c-a53ff2bc7217> /usr/lib/system/libsystem_kernel.dylib
0x181bfc000 - 0x181c08fff libsystem_pthread.dylib (*) <3b8268be-4e02-3b4a-8b41-baed2bbaacff> /usr/lib/system/libsystem_pthread.dylib
0x181a96000 - 0x181b17ffb libsystem_c.dylib (*) <96556ba0-9c34-326a-89f4-d3835de617ae> /usr/lib/system/libsystem_c.dylib
0x181ba6000 - 0x181bc0fff libc++abi.dylib (*) <7de440df-bc7d-3ff3-905d-2e17a7629449> /usr/lib/libc++abi.dylib
0x181828000 - 0x181879ca3 libobjc.A.dylib (*) <219c0324-7a4f-338e-a395-3d023b289a7f> /usr/lib/libobjc.A.dylib
0x181c6c000 - 0x182160fff com.apple.CoreFoundation (6.9) /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
0x1cac9e000 - 0x1cacb5fff com.apple.ScriptingBridge (1.4) <41379f4e-f1cc-3974-863c-9b43a004a9f2> /System/Library/Frameworks/ScriptingBridge.framework/Versions/A/ScriptingBridge
0x18187a000 - 0x1818fc7b3 dyld (*) <6beafde4-b011-3e47-8aae-4d7b6e4bb7e8> /usr/lib/dyld
0x0 - 0xffffffffffffffff ??? (*) <00000000-0000-0000-0000-000000000000> ???

External Modification Summary:
Calls made by other processes targeting this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by all processes on this machine:
task_for_pid: 0
thread_create: 0
thread_set_state: 0

VM Region Summary:
ReadOnly portion of Libraries: Total=859.8M resident=0K(0%) swapped_out_or_unallocated=859.8M(100%)
Writable regions: Total=819.6M written=337K(0%) resident=337K(0%) swapped_out=0K(0%) unallocated=819.3M(100%)

VIRTUAL REGION
REGION TYPE SIZE COUNT (non-coalesced)
=========== ======= =======
Activity Tracing 256K 1
ColorSync 16K 1
Kernel Alloc Once 32K 1
MALLOC 809.4M 34
MALLOC guard page 288K 18
STACK GUARD 56.1M 4
Stack 9808K 4
VM_ALLOCATE 16K 1
__AUTH 1079K 204
__AUTH_CONST 18.1M 356
__DATA 4472K 336
__DATA_CONST 13.0M 359
__DATA_DIRTY 692K 110
__FONT_DATA 2352 1
__LINKEDIT 584.4M 2
__OBJC_RW 2354K 1
__TEXT 275.3M 372
__TPRO_CONST 272K 2
mapped file 41.2M 7
owned unmapped memory 32K 1
page table in kernel 337K 1
shared memory 976K 12
=========== ======= =======
TOTAL 1.8G 1828

-----------
Full Report
-----------

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```

Thanks for any help!