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From: "gcc at sicherha dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/110027] Misaligned vector store on
 detect_stack_use_after_return
Date: Sun, 22 Oct 2023 18:06:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110027

Christoph Erhardt <gcc at sicherha dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gcc at sicherha dot de

--- Comment #4 from Christoph Erhardt <gcc at sicherha dot de> ---
Created attachment 56169
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D56169&action=3Dedit
Reproducer program

Here's a program that can reproduce this issue more reliably - tested on Fe=
dora
38, Ubuntu 23.04 and Ubuntu 23.10.

I have stripped down the code as far as possible. This is how far I could g=
et
without losing reproducibility.
Sources are in a GitHub repo:
https://github.com/sicherha/gcc-asan-stack-misalign

$ gcc -Wall -Wextra -g -Og -fsanitize=3Daddress -fno-stack-protector -mavx5=
12f
a-repro.i=20
$ ./a.out=20
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=3D3618=3D=3DERROR: AddressSanitizer: SEGV on unknown address (pc 0x0000=
00401789 bp
0x7ffeabbcda00 sp 0x7ffeabbcd580 T0)
=3D=3D3618=3D=3DThe signal is caused by a READ memory access.
=3D=3D3618=3D=3DHint: this fault was caused by a dereference of a high valu=
e address
(see register values below).  Disassemble the provided pc to learn which
register was used.
    #0 0x401789 in blake3_compress_subtree_wide
/home/ul26967/Projects/gcc-asan-stack-misalign/a-repro.i:481
    #1 0x40189b in main
/home/ul26967/Projects/gcc-asan-stack-misalign/a-repro.i:488
    #2 0x7f77a0210b89 in __libc_start_call_main (/lib64/libc.so.6+0x27b89)
(BuildId: 3ebe8d97a0ed3e1f13476a02665c5a9442adcd78)
    #3 0x7f77a0210c4a in __libc_start_main_alias_2 (/lib64/libc.so.6+0x27c4=
a)
(BuildId: 3ebe8d97a0ed3e1f13476a02665c5a9442adcd78)
    #4 0x4010f4 in _start
(/home/ul26967/Projects/gcc-asan-stack-misalign/a.out+0x4010f4) (BuildId:
e25b3ac48fa6dd8cff5d228e201834fa1b0cd18a)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV
/home/ul26967/Projects/gcc-asan-stack-misalign/a-repro.i:481 in
blake3_compress_subtree_wide
=3D=3D3618=3D=3DABORTING=