From: Josh Poimboeuf <jpoimboe@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Arnd Bergmann <arnd@arndb.de>,
the arch/x86 maintainers <x86@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Remaining randconfig objtool warnings, linux-next-20200428
Date: Fri, 1 May 2020 12:50:22 -0500 [thread overview]
Message-ID: <20200501175022.yf3a34lu3ufui5ag@treble> (raw)
In-Reply-To: <20200501172616.GG3762@hirez.programming.kicks-ass.net>
On Fri, May 01, 2020 at 07:26:16PM +0200, Peter Zijlstra wrote:
> On Fri, May 01, 2020 at 07:21:31PM +0200, Arnd Bergmann wrote:
> > On Thu, Apr 30, 2020 at 4:05 PM Arnd Bergmann <arnd@arndb.de> wrote:
> > it gets into undefined behavior and stops emitting code after the call to
>
> > Do we consider this expected behavior on gcc's side, or is it something
> > that should not happen and needs a gcc bug report?
>
> When it hits UB it is of course free to do whatever it damn well
> pleases, but just stopping code gen seems a little extreme, at least
> issue a WARN that something is up or so.
>
> Not sure how the GCC folks feel about this though.
When we've seen truncated code flow like this in the past, it's either
been a code bug (undefined behavior) or a GCC bug. So this is new.
Is it only seen with GCC_PLUGIN_SANCOV enabled? Maybe (hopefully) it's
an issue with the plugin and how it interacts with GCC 10.
--
Josh
next prev parent reply other threads:[~2020-05-01 17:50 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-28 14:49 Remaining randconfig objtool warnings, linux-next-20200428 Arnd Bergmann
2020-04-28 16:10 ` Josh Poimboeuf
2020-04-28 19:11 ` Kees Cook
2020-04-28 20:19 ` Arnd Bergmann
2020-04-28 20:38 ` Josh Poimboeuf
2020-04-28 21:55 ` Peter Zijlstra
2020-04-28 22:03 ` Josh Poimboeuf
2020-04-28 22:33 ` Peter Zijlstra
2020-04-28 22:48 ` Josh Poimboeuf
2020-04-28 23:08 ` Josh Poimboeuf
2020-04-29 18:55 ` Josh Poimboeuf
2020-04-29 22:46 ` Arnd Bergmann
2020-04-29 23:01 ` Josh Poimboeuf
2020-04-29 23:11 ` Josh Poimboeuf
2020-04-29 23:28 ` Josh Poimboeuf
2020-04-30 13:41 ` Arnd Bergmann
2020-04-30 14:33 ` Josh Poimboeuf
2020-04-30 19:46 ` Josh Poimboeuf
2020-04-30 20:59 ` Arnd Bergmann
2020-04-30 21:10 ` Josh Poimboeuf
2020-04-30 21:08 ` Josh Poimboeuf
2020-04-30 23:02 ` Josh Poimboeuf
2020-04-29 19:18 ` Josh Poimboeuf
2020-05-01 12:23 ` Peter Zijlstra
2020-04-30 14:05 ` Arnd Bergmann
2020-05-01 0:28 ` Josh Poimboeuf
2020-05-01 11:41 ` Arnd Bergmann
2020-05-01 17:16 ` Peter Zijlstra
2020-05-01 12:27 ` Peter Zijlstra
2020-05-01 1:07 ` Josh Poimboeuf
2020-05-01 11:18 ` Arnd Bergmann
2020-05-01 12:33 ` Peter Zijlstra
2020-05-01 13:08 ` Arnd Bergmann
2020-05-01 15:49 ` Josh Poimboeuf
2020-05-01 17:21 ` Arnd Bergmann
2020-05-01 17:26 ` Peter Zijlstra
2020-05-01 17:50 ` Josh Poimboeuf [this message]
2020-05-01 19:47 ` Arnd Bergmann
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