From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id DF1773940CDE; Sun,  2 Jun 2024 20:48:06 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org DF1773940CDE
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1717361286;
	bh=SwRjYQjFHsQ2Opq3f0livk8pgJ/F0U0+F5NDil8Yh0U=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=v+0HsCOD5aiW9CItss6+29bOdqtEZdJina4EiinLOEUoO1YwdQl7OcRzYg8rG6jfS
	 n2zHYOMz4zkA7Set2VjMR9N2jDCAQUlHEswcBHTM3d/DtCmwkfMGdSKS8AbfbER+wL
	 yG4QaJBSLZdRQWhNHFLAiQUamj7a4iealo501KwQ=
From: "gcc at sicherha dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/110027] [11/12 regression] Stack objects with
 extended alignments (vectors etc) misaligned on detect_stack_use_after_return
Date: Sun, 02 Jun 2024 20:48:04 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Version: 13.1.1
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: gcc at sicherha dot de
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: jakub at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 11.5
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: attachments.isobsolete attachments.created
Message-ID: <bug-110027-4-IGjXJw4Ttp@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-110027-4@http.gcc.gnu.org/bugzilla/>
References: <bug-110027-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110027

Christoph Erhardt <gcc at sicherha dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #56169|0                           |1
        is obsolete|                            |

--- Comment #26 from Christoph Erhardt <gcc at sicherha dot de> ---
Created attachment 58325
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D58325&action=3Dedit
Reproducer program, new version

Unfortunately, the fix appears to be incomplete. On x86_64 Fedora Linux 40 =
with
the latest GCC 14.1.1, my reproducer program still segfaults with a misalig=
ned
`vmovdqa64`.
I have managed to further strip the program down to a now-manageable size -=
 see
attachment.

$ gcc -Wall -Wextra -g -Og -fsanitize=3Daddress -fno-stack-protector -mavx5=
12f
a-repro.i
$ ./a.out
AddressSanitizer:DEADLYSIGNAL
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D107156=3D=3DERROR: AddressSanitizer: SEGV on unknown address (pc 0x00=
0000401463
bp 0x7ffd76144620 sp 0x7ffd76144200 T0)
=3D=3D107156=3D=3DThe signal is caused by a READ memory access.
=3D=3D107156=3D=3DHint: this fault was caused by a dereference of a high va=
lue address
(see register values below).  Disassemble the provided pc to learn which
register was used.
    #0 0x401463 in blake3_compress_subtree_wide
/home/christoph/Projects/gcc-asan-stack-misalign/repro.c:52
    #1 0x40158c in main
/home/christoph/Projects/gcc-asan-stack-misalign/repro.c:57
    #2 0x7f60dde3d087 in __libc_start_call_main (/lib64/libc.so.6+0x2a087)
(BuildId: 4a92fcedbba6d6d2629ce066a2970017faa9995e)
    #3 0x7f60dde3d14a in __libc_start_main_alias_2 (/lib64/libc.so.6+0x2a14=
a)
(BuildId: 4a92fcedbba6d6d2629ce066a2970017faa9995e)
    #4 0x4010b4 in _start
(/home/christoph/Projects/gcc-asan-stack-misalign/a.out+0x4010b4) (BuildId:
9f1d4d25413300b7347d0776d7087844a8d56649)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV
/home/christoph/Projects/gcc-asan-stack-misalign/repro.c:52 in
blake3_compress_subtree_wide
=3D=3D107156=3D=3DABORTING=