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From: "akrl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug jit/98615] New: libgccjit crash while freeing 'clone_info' in
 'cgraph_c_finalize'
Date: Sun, 10 Jan 2021 11:14:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98615

            Bug ID: 98615
           Summary: libgccjit crash while freeing 'clone_info' in
                    'cgraph_c_finalize'
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: jit
          Assignee: dmalcolm at gcc dot gnu.org
          Reporter: akrl at gcc dot gnu.org
  Target Milestone: ---

Created attachment 49928
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D49928&action=3Dedit
reproducer

=3D=3D=3D=3D
$ gcc libgccjit_repro.c -lgccjit
$ ./a.out
munmap_chunk(): invalid pointer
Aborted (core dumped)
=3D=3D=3D=3D

What is going on is that a static function (CAR) is inlined via virtual clo=
ne
and its symbol released.

Eventually 'cgraph_c_finalize' calls 'clone_info::release' and this is where
(not sure why) we crash.

I believe this bug was introduced by:=20

ae7a23a3fab Move clone_info to summary

The first revision where is possible to reproduce on was unbroken few commi=
ts
later with:

895fdc1f4c9 ipa: Fix segmentation fault in
function_summary<clone_info*>::get(cgraph_node*)

I found this because it breaks Emacs bootstrap on libgccjit.=