public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "shaohua.li at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/111319] Wrong code at -O2 on x86_64-linux-gnu
Date: Thu, 07 Sep 2023 08:09:51 +0000 [thread overview]
Message-ID: <bug-111319-4-CWotj4pLbI@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-111319-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111319
--- Comment #4 from Shaohua Li <shaohua.li at inf dot ethz.ch> ---
(In reply to Xi Ruoyao from comment #3)
> Please try not to create more reports with "not sure if there is UB" esp.
> this UB should be obvious, and it's also detectable with
> -fsanitize=undefined:
>
> t.c:13:7: runtime error: load of address 0x7ffd53183020 with insufficient
> space for an object of type 'int'
> 0x7ffd53183020: note: pointer points here
> 2a 56 00 00 01 00 00 00 00 00 00 00 00 14 1a ed ca 50 d4 0e 00 00 00 00
> 00 00 00 00 98 31 18 53
> ^
UBSan only detects it at -O2 level and I used `-O0
-fsanitize=address,undefined` to detect if there is any report.
https://godbolt.org/z/zvcG8znvT
prev parent reply other threads:[~2023-09-07 8:09 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-07 7:38 [Bug c/111319] New: " shaohua.li at inf dot ethz.ch
2023-09-07 7:40 ` [Bug c/111319] " pinskia at gcc dot gnu.org
2023-09-07 7:59 ` pinskia at gcc dot gnu.org
2023-09-07 8:01 ` xry111 at gcc dot gnu.org
2023-09-07 8:09 ` shaohua.li at inf dot ethz.ch [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=bug-111319-4-CWotj4pLbI@http.gcc.gnu.org/bugzilla/ \
--to=gcc-bugzilla@gcc.gnu.org \
--cc=gcc-bugs@gcc.gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).