Re: [BUG] Valgrind error while freeing memory in eval_clear
- ZyX wrote:
> While searching for the bug in my extended-funcref branch I found thatThanks for finding this and providing a solution. I'll have to think
> *in this branch* it is possible to access freed memory: variable
> cleared by vars_clear may contain reference to the variable already
> freed by vim_free(SCRIPT_SV(i)).
> Almost minimal example of environment that is enough for reproducing
> the bug is attached. Note that only build with EXITFREE defined
> (normally development build) is subject to this kind of error. To see
> this error run under valgrind
> vim -u ../vimrc -s efref-valgrind.in
> while being in test/ subdirectory found in the archive. This error
> happens for both my branch and upstream, but I was thinking it was my
> failure because I did not have development version of upstream
> The following patch fixes the problem for me (main idea is that you
> first clear all variables and only then do actual freeing).
> Note that it may make sense to defer the second cycle (and hence
> ga_clear() call) until garbage_collect() call (in case reference to
> script-local scope is saved to a list/dictionary that then became
> unreferenced), but I am not sure.
about whether there is still a way this may fail.
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That's why I am using Vim. --Anonymous
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