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So, we had a new OSVM release 2023.12, tag 202312181441. Our CI built that using `Clang 17.0.6`. We bundled the binary with Squeak 5.3 #19486. Things worked.
Now, I noticed that rebuilding tag 202312181441 with the current `Clang 18.1.2` produces binaries that will immediately crash Squeak 5.3 #19486. Squeak 6.0 works and so does 6.1alpha.
[crash.dmp](https://github.com/OpenSmalltalk/opensmalltalk-vm/files/14886860…
```
...
Crashed in the VM thread
...
Current byte code: 224
Primitive index: 0
...
Primitive trace:
Stack backtrace:
[00007ff7c554368a] __DTOR_LIST__
+ 0x7ff6853e3fc2 in Squeak.exe
[00007ff7c66442e8] ??? + 0x0 in (null)
Smalltalk stack dump:
0000009a09fce550 I CursorWithMask(Object)>isKindOf: 00007ff7c6cf0210: a(n) CursorWithMask
0000009a09fce598 I Cursor class>currentCursor: 00007ff7c66442e8: a(n) Cursor
0000009a09fce5e0 I CursorWithMask(Cursor)>show 00007ff7c6cf0210: a(n) CursorWithMask
0000009a09fce630 I SmalltalkImage>snapshot:andQuit:withExitCode:embedded: 00007ff7c6688088: a(n) SmalltalkImage
7ff7c8c516d8 s SmalltalkImage>snapshot:andQuit:embedded: 00007ff7c6688088: a(n) SmalltalkImage
7ff7c8c52f28 s SmalltalkImage>snapshot:andQuit: 00007ff7c6688088: a(n) SmalltalkImage
7ff7c8c53098 s [] in ReleaseBuilder class>saveAndQuit 00007ff7c6657cd8: a(n) ReleaseBuilder
7ff7c8c53228 s WorldState>runStepMethodsIn: 00007ff7c6915f38: a(n) WorldState
7ff7c8c53320 s PasteUpMorph>runStepMethods 00007ff7c6734988: a(n) PasteUpMorph
7ff7c8c53490 s WorldState>doOneCycleNowFor: 00007ff7c6915f38: a(n) WorldState
7ff7c8c53548 s WorldState>doOneCycleFor: 00007ff7c6915f38: a(n) WorldState
7ff7c8c53610 s PasteUpMorph>doOneCycle 00007ff7c6734988: a(n) PasteUpMorph
7ff7c8c536c8 s [] in MorphicProject>spawnNewProcess 00007ff7c6af0f80: a(n) MorphicProject
7ff7c8c53780 s [] in BlockClosure>newProcess 00007ff7c8c53838: a(n) BlockClosure
stack page bytes 4096 available headroom 1480 minimum unused headroom 0
```
What is going on? I cannot rebuild tag 202312181441 with `Clang 18.1.2` to then let it run Squeak 5.3 #19486. Neither 32-bit nor 64-bit. Squeak 6.0 and 6.1alpha work. I know that tag 202312181441 used to work with Squeak 5.3 ... that's why I suspect Clang here...
The Smalltalk code after start-up that seems to trigger the crash is more or less `isKindOf:`:
```Smalltalk
Cursor normal show.
Cursor >> show
"Make the hardware's mouse cursor look like the receiver"
Cursor currentCursor: self
Cursor class >> currentCursor: aCursor
"Make the instance of cursor, aCursor, be the current cursor. Display it.
Create an error if the argument is not a Cursor."
(aCursor isKindOf: self)
ifTrue: [ "..." ]
ifFalse: [self error: 'The new cursor must be an instance of class Cursor']
```
Between Squeak 5.3 and 6.0, that code path did not change. We are still setting the normal Cursor after start-up, which invokes `currentCursor:` and then that `isKindOf:` check.
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