linux-kernel - Re: [PATCH] selftests/ftrace: Correctly enable event in instance-event.tc

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Message-ID: <9cad73cd-1f8b-2f3f-cda4-99b89a87b931@huawei.com>
Date:   Wed, 6 Sep 2023 09:42:44 +0800
From:   Zheng Yejian <zhengyejian1@...wei.com>
To:     Steven Rostedt <rostedt@...dmis.org>
CC:     "Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
        Ajay Kaher <akaher@...are.com>, <shuah@...nel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-trace-kernel@...r.kernel.org>,
        <linux-kselftest@...r.kernel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Ye Weihua <yeweihua4@...wei.com>
Subject: Re: [PATCH] selftests/ftrace: Correctly enable event in
 instance-event.tc

On 2023/9/6 06:36, Steven Rostedt wrote:
> On Tue, 5 Sep 2023 20:54:40 +0800
> Zheng Yejian <zhengyejian1@...wei.com> wrote:
> 
>> Hi, Steve, Ajay,
>>
>> After this patch and run this testcase, I got an use-after-free report
>> by KASAN. Short log see [1], full logs see attach "panic.log".
>>
>> And by simple bisect, I found it may be introduced by:
>>
>>     27152bceea1d ("eventfs: Move tracing/events to eventfs")
>>
>> Link:
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=27152bceea1df27ffebb12ac9cd9adbf2c4c3f35
> 
> Hi Zheng,
> 
> Can you test:
> 
>     https://lore.kernel.org/all/20230905183332.628d7cc0@gandalf.local.home/
> 
> and see if it fixes the KASAN issue for you?

Hi, Steve, your new patch seems not fixes the KASAN issue.

I run the instance-event.tc with your patch again and get same KASAN 
report.

My config is in:
 
https://lore.kernel.org/all/da5495b5-cdb5-cb82-dd9b-37e7a87ed97d@huawei.com/

> 
> Thanks!
> 
> -- Steve
>