linux-hardening - Re: [linux-stable-rc:linux-4.19.y] [panic] 4d00e68cfc: WARNING:at_fs/sysfs/file.c:#sysfs_emit

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Date:   Thu, 16 Mar 2023 23:32:13 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     kernel test robot <yujie.liu@...el.com>
Cc:     Kees Cook <keescook@...omium.org>, oe-lkp@...ts.linux.dev,
        lkp@...el.com, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Petr Mladek <pmladek@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        tangmeng <tangmeng@...ontech.com>,
        "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Luis Chamberlain <mcgrof@...nel.org>,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
        aliyunlinux2-dev@...ux.alibaba.com, jane.lv@...el.com
Subject: Re: [linux-stable-rc:linux-4.19.y] [panic] 4d00e68cfc:
 WARNING:at_fs/sysfs/file.c:#sysfs_emit_at

On Tue, Mar 14, 2023 at 04:34:22PM +0800, kernel test robot wrote:
> Greeting,
> 
> FYI, we noticed WARNING:at_fs/sysfs/file.c:#sysfs_emit_at due to commit (built with gcc-11):
> 
> commit: 4d00e68cfcfd91d3a8c794d47617429a96d623ed ("panic: Expose "warn_count" to sysfs")
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable-rc.git linux-4.19.y

It turns out this is a longstanding bug in 4.19.y and 4.14.y caused by a bad
backport, which is not actually related to the above commit (or the patch series
that contained it) at all.  I've sent out fixes:

4.19: https://lore.kernel.org/r/20230317062743.313169-1-ebiggers@kernel.org
4.14: https://lore.kernel.org/r/20230317062801.313217-1-ebiggers@kernel.org

- Eric