Re: Fix to long-standing crashes in GC

[Stefan Monnier]

> The main problem was that marker blocks could be freed while
> still being pointed to by buffer undo lists, but I made other
> minor changes to make the code more robust.

I don't have access to the code right now, so I can't see whether you've
added comments that explain the issue.  Could you either explain the issue
(i.e. a sample scenario) here or in a comment in the code?
If the code already has it, please ignore this email.


        Stefan