08820: rewind feature can cause MAME to lock up

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08820	Save/Restore	Critical (emulator)	Always	Feb 12, 2024, 11:07	Feb 24, 2024, 11:08

Tester	hap	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS
Status [?]	Confirmed			Driver
Version	0.262	Fixed in Version		Build
		Fixed in Git Commit		Github Pull Request #

Summary	08820: rewind feature can cause MAME to lock up
Description	I was fiddling with MAME's rewind feature, IMO quite unintuitive with how it doubles frame advance (shift+P) with saving an internal rewind state instead of automatically. But that aside, it's possible to make MAME lock up. See Steps To Reproduce.
Steps To Reproduce	mame.exe pacman -rewind - hold shift (keep holding it) - press P - press tilde - press P - press tilde - press P - MAME locked up Default keys Tilde/P are for MAME 0.262 and older. On 0.263, the default keys are F4/F5.
Additional Information
Github Commit

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No.21963 Robbbert Senior Tester Feb 14, 2024, 14:19	My version of mame (current git) has the new keys, so I had to use the release version of arcade instead. The reported issue was able to be reproduced. Can you add some info of how this could be replicated with the rearranged F-keys?
No.21964 hap Developer Feb 14, 2024, 15:13	When the next release is out, sure. MAMEtesters = for official releases. Plus, RB may have to do a pokemon battle with a dev that disagrees with the UI shortcut key changes, and the thing getting reverted depending on who won.
No.21965 Robbbert Senior Tester Feb 14, 2024, 15:34	Yes fair enough. The situation does look uncomfortable at the moment - we'll see what happens.