|
From: | Valentin Gatien-Baron |
Subject: | bug#29066: 26.0.90; crash in gc involving buffer local symbols |
Date: | Mon, 30 Oct 2017 18:04:14 -0400 |
> From: Valentin Gatien-Baron <vgatien-baron@janestreet.com>
> Date: Mon, 30 Oct 2017 10:36:41 -0400
> Cc: Mark Shinwell <mshinwell@janestreet.com>
>
> $ installed/bin/emacs -Q -L . -batch --eval '(progn (message "before") (make-local-variable (make-symbol "\
> s")) (kill-buffer) (garbage-collect) (garbage-collect) (message "after"))'
> before
> *** Error in `installed/bin/emacs': double free or corruption (!prev): 0x00000000014bff10 ***
Thanks.
Does the below fix the problem?
diff --git a/src/alloc.c b/src/alloc.c
index d9d7485..11afdfd 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -7024,7 +7024,9 @@ sweep_symbols (void)
{
if (!sym->s.gcmarkbit)
{
- if (sym->s.redirect == SYMBOL_LOCALIZED)
+ if (sym->s.redirect == SYMBOL_LOCALIZED
+ /* Already freed? */
+ && !EQ (sym->s.function, Vdead))
xfree (SYMBOL_BLV (&sym->s));
sym->s.next = symbol_free_list;
symbol_free_list = &sym->s;
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