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Date:   Thu, 16 Mar 2023 23:32:13 -0700
From:   Eric Biggers <ebiggers@kernel.org>
To:     kernel test robot <yujie.liu@intel.com>
Cc:     Kees Cook <keescook@chromium.org>, oe-lkp@lists.linux.dev,
        lkp@intel.com, Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Petr Mladek <pmladek@suse.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        tangmeng <tangmeng@uniontech.com>,
        "Guilherme G. Piccoli" <gpiccoli@igalia.com>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Tiezhu Yang <yangtiezhu@loongson.cn>,
        Luis Chamberlain <mcgrof@kernel.org>,
        linux-hardening@vger.kernel.org, linux-kernel@vger.kernel.org,
        aliyunlinux2-dev@linux.alibaba.com, jane.lv@intel.com
Subject: Re: [linux-stable-rc:linux-4.19.y] [panic] 4d00e68cfc:
 WARNING:at_fs/sysfs/file.c:#sysfs_emit_at
Message-ID: <20230317063213.GC882@sol.localdomain>
References: <202303141634.1e64fd76-yujie.liu@intel.com>
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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