[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Armv8 crash in MVC (Issue #617)

edoneel notifications at github.com
Wed Mar 2 18:45:01 UTC 2022


Hi,

ArmV8 crashes when you do the following:

1. Start Squeak.
2. Open a MVC Project
3. in the MVC project open a Workspace
4. Type something, and then enough returns to cause the something to scroll of the screen and the scroll bar to flop out.
5. Scroll back --> segfault.

The patch that fixes this is attached.  The patch is to take the slow path in fastPathBottomToTop in platforms/Cross/plugins/BitBltPlugin/BitBltGeneric.c

This only shows up when you use the optimized flag.

Crashes on:

gcc version 10.2.1 20210110 (Debian 10.2.1-6) 
gcc version 7.5.0 (Ubuntu/Linaro 7.5.0-3ubuntu1~18.04) 

cheers

bruce
[PatchBitBltGeneric.patch.txt](https://github.com/OpenSmalltalk/opensmalltalk-vm/files/8172065/PatchBitBltGeneric.patch.txt)


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