linux-kernel - Re: Linux 6.2-rc3

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Date:   Mon, 9 Jan 2023 23:43:29 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Marco Elver <elver@...gle.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Kees Cook <kees@...nel.org>, Jaegeuk Kim <jaegeuk@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 6.2-rc3

On 1/9/23 23:18, Linus Torvalds wrote:
> On Mon, Jan 9, 2023 at 11:47 AM Guenter Roeck <linux@...ck-us.net> wrote:
>>
>> fs/f2fs/inline.c: In function 'f2fs_move_inline_dirents':
>> include/linux/fortify-string.h:59:33: error: '__builtin_memset' pointer overflow between offset [28, 898293814] and size [-898293787, -1] [-Werror=array-bounds]
> 
> Ok, I guess we'll have to disable this gcc warning for this version
> again. I don't think anybody figured out why it happens. We had
> several people look at it (Kees, Vlastimil, Jaegeuk) and I think
> everybody ended up going "tis looks like a compiler thing".
> 
> Does anybody remember - what was the compiler version again and what
> do we need to disable?

Guenter reported that "The problem is seen with gcc 11.3.0, but not with gcc
12.2.0 nor with gcc 10.3.0."

https://lore.kernel.org/all/20221227002941.GA2691687@roeck-us.net/

Kees said it's -Warray-bounds, already disabled on gcc 12 for other reasons:

https://lore.kernel.org/all/D8BDBF66-E44C-45D4-9758-BAAA4F0C1998@kernel.org/