System.IO.Hashing tests failing on Mono Apple mobile (SIGILL in Crc32 ARM64) #125723

Incident Identifier: A2C6C88D-017D-47EE-B4CE-C8197C307D04
CrashReporter Key:   b7fb6de85543365d88bc62383220a77d2b426aa8
Hardware Model:      AppleTV5,3
Process:             System.IO.Hashing.Tests [657]
Path:                /private/var/containers/Bundle/Application/313BCA2D-2D9D-4FE0-833F-2ED1151ED330/System.IO.Hashing.Tests.app/System.IO.Hashing.Tests
Identifier:          net.dot.System.IO.Hashing.Tests
Version:             1.0 (1)
Code Type:           ARM-64 (Native)
Role:                Foreground
Parent Process:      launchd [1]
Coalition:           net.dot.System.IO.Hashing.Tests [708]

Date/Time:           2026-03-17 12:30:54.6035 -0700
Launch Time:         2026-03-17 12:30:50.8246 -0700
OS Version:          Apple TVOS 26.2 (23K54)
Release Type:        User
Report Version:      104

Exception Type:  EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes: 0x0000000000000001, 0x000000001ad44000
Termination Reason: SIGNAL 4 Illegal instruction: 4
Terminating Process: exc handler [657]

Triggered by Thread:  11

Thread 0 name:   Dispatch queue: com.apple.main-thread
Thread 0:
0   libsystem_kernel.dylib             0x1b309a874 mach_msg2_trap + 8
1   libsystem_kernel.dylib             0x1b309b3e8 mach_msg2_internal + 72
2   libsystem_kernel.dylib             0x1b309b378 mach_msg_overwrite + 524
3   libsystem_kernel.dylib             0x1b309b160 mach_msg + 20
4   CoreFoundation                     0x19181ac9c __CFRunLoopServiceMachPort + 156
5   CoreFoundation                     0x19181b520 __CFRunLoopRun + 1180
6   CoreFoundation                     0x191841438 _CFRunLoopRunSpecificWithOptions + 496
7   GraphicsServices                   0x1d5acaabc GSEventRunModal + 116
8   UIKitCore                          0x19e0210c8 -[UIApplication _run] + 772
9   UIKitCore                          0x19e025660 UIApplicationMain + 148
10  System.IO.Hashing.Tests            0x10075fe48 main + 68
11  dyld                               0x19056d89c start + 2592

Thread 11 name:  .NET TP Worker
Thread 11 Crashed:
0   System.IO.Hashing.Tests            0x100e21a48 System_IO_Hashing_System_IO_Hashing_Crc32ParameterSet_Ieee8023ParameterSet_UpdateScalarArm64_uint_System_ReadOnlySpan_1_byte + 68
1   System.IO.Hashing.Tests            0x1005f850c mono_jit_runtime_invoke + 1560
2   System.IO.Hashing.Tests            0x10059ab94 mono_runtime_invoke_checked + 148
3   System.IO.Hashing.Tests            0x1005a2f0c mono_runtime_try_invoke_byrefs + 640
4   System.IO.Hashing.Tests            0x10055c7fc ves_icall_InternalInvoke + 236
5   System.IO.Hashing.Tests            0x1005667e4 ves_icall_InternalInvoke_raw + 100
6   System.IO.Hashing.Tests            0x10093de90 wrapper_managed_to_native_System_Reflection_RuntimeMethodInfo_InternalInvoke_object_intptr__System_Exception_ + 160
7   System.IO.Hashing.Tests            0x10139c170 corlib_System_Reflection_MethodBaseInvoker_InterpretedInvoke_Method_object_intptr_ + 88
8   System.IO.Hashing.Tests            0x1013a3140 corlib_System_Reflection_RuntimeMethodInfo_Invoke_object_System_Reflection_BindingFlags_System_Reflection_Binder_object___System_Globalization_CultureInfo + 540

Thread 11 crashed with ARM Thread State (64-bit):
    x0: 0x00000000ffffffff   x1: 0x000000010768c068   x2: 0x0000000000000007   x3: 0x0000000000000007
    x4: 0x0000000170231d2c   x5: 0x0000000170231978   x6: 0x0000000000000000   x7: 0x0000000000000000
    x8: 0x0000000000000000   x9: 0x0000000000000001  x10: 0x0000000000000003  x11: 0x0000010000000000
   x12: 0x00000000fffffffd  x13: 0x0000000000000000  x14: 0x0000000000000000  x15: 0x000000015cbe4290
   x16: 0x0000000170231d00  x17: 0x0000000100e21898  x18: 0x0000000000000000  x19: 0x00000001024ecb58
   x20: 0x0000000000000017  x21: 0x0000000000000007  x22: 0x000000010768a228  x23: 0x000000010768c048
   x24: 0x00000003033e19a0  x25: 0x0000000102476000  x26: 0x0000000000000004  x27: 0x0000000102476000
   x28: 0x0000000102476000   fp: 0x0000000170231e20   lr: 0x0000000100e218cc
    sp: 0x0000000170231ca0   pc: 0x0000000100e21a48 cpsr: 0x20000000
   far: 0x0000000000000000  esr: 0x02000000 (null)

Binary Images:
       0x1004c4000 -        0x1022bbfff System.IO.Hashing.Tests arm64
       0x1b309a000 -        0x1b30d0f33 libsystem_kernel.dylib arm64
       0x191811000 -        0x191d7d03f CoreFoundation arm64
       0x1d5ac8000 -        0x1d5ad005f GraphicsServices arm64
       0x19d0a4000 -        0x19ee7d9df UIKitCore arm64
       0x190557000 -        0x1905d3a83 dyld arm64
       0x1b15eb000 -        0x1b15f654b libsystem_pthread.dylib arm64
       0x1a69ac000 -        0x1a69edabf libdispatch.dylib arm64
       0x1905d4000 -        0x191354c1f Foundation arm64