From: Petr Mladek <pmladek@suse.com>
To: kernel test robot <xiaolong.ye@intel.com>
Cc: Sebastian Duda <sebastian.duda@fau.de>,
linux-kernel@i4.cs.fau.de,
Tobias Baumeister <tobias.baumeister@fau.de>,
Andrew Morton <akpm@linux-foundation.org>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Borislav Petkov <bp@suse.de>, Tejun Heo <tj@kernel.org>,
Thierry Reding <treding@nvidia.com>,
open list <linux-kernel@vger.kernel.org>,
lkp@01.org
Subject: Re: [lkp] [printk.c] ea0639c4d5: BUG:recent_printk_recursion
Date: Fri, 2 Dec 2016 11:05:58 +0100 [thread overview]
Message-ID: <20161202100558.GR21230@pathway.suse.cz> (raw)
In-Reply-To: <20161201171232.GD31607@yexl-desktop>
On Fri 2016-12-02 01:12:32, kernel test robot wrote:
>
> FYI, we noticed the following commit:
>
> commit: ea0639c4d5c700ad63c0ace6a7a17877aac5b4c2 ("printk.c: removed unnecessary code")
> url: https://github.com/0day-ci/linux/commits/Sebastian-Duda/printk-c-removed-unnecessary-code/20161130-225006
>
>
> in testcase: trinity
> with following parameters:
>
> runtime: 300s
>
> test-description: Trinity is a linux system call fuzz tester.
> test-url: http://codemonkey.org.uk/projects/trinity/
>
>
> on test machine: qemu-system-i386 -enable-kvm -m 256M
>
> caused below changes:
>
>
> +-------------------------------------------------------+------------+------------+
> | | ded6e842cf | ea0639c4d5 |
> +-------------------------------------------------------+------------+------------+
> | boot_successes | 19 | 8 |
> | boot_failures | 3 | 49 |
I am not surprised. The patch breaks counting of the space
needed to print the message. It is likely to cause buffer
overflows. I have already nacked it, see
https://lkml.kernel.org/r/20161130102231.GE24060@pathway.suse.cz
Anyway, thanks for testing.
Best Regards,
Petr
prev parent reply other threads:[~2016-12-02 10:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-29 15:19 [PATCH] printk.c: removed unnecessary code Sebastian Duda
2016-11-30 9:14 ` Michal Hocko
2016-11-30 10:22 ` Petr Mladek
2016-12-01 17:12 ` [lkp] [printk.c] ea0639c4d5: BUG:recent_printk_recursion kernel test robot
2016-12-02 10:05 ` Petr Mladek [this message]
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