https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84796
David Malcolm <dmalcolm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-12
CC| |dmalcolm at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Thanks for filing this bug.
Confirmed. The bogus access is here in tsubst_pack_expansion:
11742 if (level <= levels)
11743 arg_pack = TMPL_ARG (args, level, idx);
(gdb) call debug_tree (args)
<tree_vec 0x7ffff1a24000 length:0>
(gdb) p level
$5 = 1
(gdb) p idx
$6 = 0
(gdb) p levels
$7 = 1
Bisection with checked binaries shows this started with r208178; I'm able to
reproduce it with a checked build of gcc 7; it's only failing to show up for
regular gcc 7 builds since checking is turned off by default for release
builds.
