Why does Matlab crash with "illegal instruction detected"?

Upon start, it got stuck at the 'initializing" stage. And I got the following crash report as below. Does anyone know what it means and how to resolve the issue? Many thanks.

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Illegal instruction detected at 2025-04-01 06:34:30 +0100

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Configuration:

Crash Decoding : Disabled - No sandbox or build area path

Crash Mode : continue (default)

Default Encoding : windows-1252

Deployed : false

Java Version : Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode

MATLAB Architecture : win64

MATLAB Entitlement ID : 2344556

MATLAB Root : C:\Program Files\MATLAB\R2020b

MATLAB Version : 9.9.0.1495850 (R2020b) Update 1

Operating System : Microsoft Windows 10 Education

Process ID : 18844

Processor ID : x86 Family 6 Model 165 Stepping 5, GenuineIntel

Session Key : 86bc64d9-f104-4f05-8613-c56c82b7acc8

Window System : Version 10.0 (Build 19045)

Fault Count: 1

Abnormal termination:

Illegal instruction

Current Thread: 'MCR 0 interpreter thread' id 12192

Register State (from fault):

RAX = 0000028c98401098 RBX = 0000028c98401090

RCX = 000000e208df8930 RDX = 0000028c98401098

RSP = 000000e208df8688 RBP = 000000e208df8790

RSI = 000000e208df8930 RDI = 0000000000000000

R8 = 0000000000000000 R9 = 0000028c98401098

R10 = 00000000000005c0 R11 = afa1b9ff673fe3b9

R12 = 0000000000000000 R13 = 0000028c983f26e8

R14 = 0000000000000001 R15 = 0000000000000000

RIP = 00007ffa5a7cd600 EFL = 00010283

CS = 0033 FS = 0053 GS = 002b

Stack Trace (from fault):

[ 0] 0x00007ffa5a7cd600 C:\Program Files\MATLAB\R2020b\bin\win64\fe_name_resolution.dll+00710144 fe::nr::SymbolTable::Classification::toString+00653712

[ 1] 0x0000028c98401090 <unknown-module>+00000000

[ 2] 0x0000028c98401098 <unknown-module>+00000000

[ 3] 0x0000000000000040 <unknown-module>+00000000

[dpb]

R2020b is pretty old now; first check if there are any updates since the version installed.

Is this a new install or just a new symptom? The error message implies it couldn't access a writeable temporary area...

If this is repeatable and not just a one-time aberration, it will take official Mathworks support to solve if rebooting then updating/reinstalling don't fix it...

[William]

@dpbThanks for your reply! It's a new symptom that never happened before since I installed R2020b years ago. It's repeatable when restarting MATLAB. Fortunately, it's now gone after reboot computer.

[dpb]

Thank you, MS! It's probably some aberration there...maybe one of its suberranean updates or some other app update, even...