linux-kernel - Re: [serial] 4a218b277f: BUG:kernel_NULL_pointer

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Date:   Thu, 5 May 2022 13:12:07 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     kernel test robot <oliver.sang@...el.com>
Cc:     Emil Renner Berthing <kernel@...il.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        lkp@...ts.01.org, lkp@...el.com
Subject: Re: [serial]  4a218b277f: BUG:kernel_NULL_pointer_dereference,address

On Thu, May 05, 2022 at 05:18:43PM +0800, kernel test robot wrote:
> 
> 
> Greeting,
> 
> FYI, we noticed the following commit (built with gcc-11):
> 
> commit: 4a218b277fdba357d8e9022ae675c94e59d64b4e ("serial: 8250: dw: Create a generic platform data structure")
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
> 
> in testcase: reaim
> version: reaim-x86_64-7.0.1.13-1_20220411
> with following parameters:
> 
> 	runtime: 300s
> 	nr_task: 100%
> 	test: shared
> 	cpufreq_governor: performance
> 	ucode: 0xec
> 
> test-description: REAIM is an updated and improved version of AIM 7 benchmark.
> test-url: https://sourceforge.net/projects/re-aim-7/
> 
> 
> on test machine: 16 threads 1 sockets Intel(R) Xeon(R) E-2278G CPU @ 3.40GHz with 32G memory
> 
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
> 
> 
> +----------------+------------+------------+
> |                | d9666dfb31 | 4a218b277f |
> +----------------+------------+------------+
> | boot_successes | 6          | 6          |
> +----------------+------------+------------+
> 
> 
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <oliver.sang@...el.com>

Isn't it what Heikki's patch should fix?

-- 
With Best Regards,
Andy Shevchenko