linux-kernel - Re: [PATCH v1 1/6] params: Use sysfs

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Date:   Thu, 21 Sep 2023 18:36:38 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     kernel test robot <oliver.sang@...el.com>
Cc:     oe-lkp@...ts.linux.dev, lkp@...el.com,
        linux-kernel@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>
Subject: Re: [PATCH v1 1/6] params: Use sysfs_emit() to instead of scnprintf()

On Thu, Sep 21, 2023 at 09:34:13PM +0800, kernel test robot wrote:
> 
> Hello,
> 
> kernel test robot noticed "WARNING:at_fs/sysfs/file.c:#sysfs_emit" on:
> 
> commit: d4004295e5502a1eb3e361e97ea4dd1686046af6 ("[PATCH v1 1/6] params: Use sysfs_emit() to instead of scnprintf()")
> url: https://github.com/intel-lab-lkp/linux/commits/Andy-Shevchenko/params-Introduce-the-param_unknown_fn-type/20230912-231033
> base: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git 0bb80ecc33a8fb5a682236443c1e740d5c917d1d
> patch link: https://lore.kernel.org/all/20230912150551.401537-1-andriy.shevchenko@linux.intel.com/
> patch subject: [PATCH v1 1/6] params: Use sysfs_emit() to instead of scnprintf()
> 
> in testcase: trinity
> version: trinity-i386-abe9de86-1_20230429
> with following parameters:
> 
> 	runtime: 300s
> 	group: group-04
> 	nr_groups: 5


> what we observed is this issue doesn't always happen. we run the test upon
> this commit almost 500 times, it happened 42 times.
> however, the parent keeps clean.
> 
>         v6.6-rc1 d4004295e5502a1eb3e361e97ea
> ---------------- ---------------------------
>        fail:runs  %reproduction    fail:runs
>            |             |             |
>            :497          8%          42:496   dmesg.EIP:sysfs_emit
>            :497          8%          42:496   dmesg.WARNING:at_fs/sysfs/file.c:#sysfs_emit

Cool! I will check this, thank you for the report.

-- 
With Best Regards,
Andy Shevchenko