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bug#22149: 24.4; gdb stack overflow in regexp matcher


From: Eli Zaretskii
Subject: bug#22149: 24.4; gdb stack overflow in regexp matcher
Date: Sat, 14 Mar 2020 12:14:24 +0200

> From: Mattias Engdegård <address@hidden>
> Date: Sat, 14 Mar 2020 10:04:38 +0100
> Cc: Noam Postavsky <address@hidden>, address@hidden,
>         Andreas Schwab <address@hidden>, Cheng-An Yang <address@hidden>
> 
> 14 mars 2020 kl. 08.58 skrev Eli Zaretskii <address@hidden>:
> 
> >  Moreover, we
> > might decide, for different reasons, to bump up the stack size of the
> > Emacs binary, which will indirectly fix this problem by making it less
> > probable.
> 
> I'm not sure how the C and regexp engine stacks relate to each other in 
> practice -- main() attempts to grow the C stack to accommodate the maximal 
> regexp stack, but SAFE_ALLOCA is set up to use the heap when necessary. 
> Surely we could decouple them more or less entirely, since the extra cost for 
> malloc is bound to be small when a lot of regexp stack is needed.

I think regex-emacs.c already overrides some of the SAFE_ALLOCA
machinery to that effect, does it not?





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