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Message-ID: <9887a296-b98e-ef2b-553f-448cd9ad72b6@linuxfoundation.org>
Date:   Mon, 19 Oct 2020 09:22:21 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Shuah Khan <shuah@...nel.org>,
        Valentina Manea <valentina.manea.m@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        USB list <linux-usb@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        syzbot <syzbot+bf1a360e305ee719e364@...kaller.appspotmail.com>,
        Nazime Hande Harputluoglu <handeharputlu@...gle.com>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: KASAN: null-ptr-deref Write in event_handler

On 10/19/20 9:10 AM, Andrey Konovalov wrote:
> On Fri, Oct 16, 2020 at 9:48 PM Shuah Khan <skhan@...uxfoundation.org> wrote:
>>
>> Andrey,
>>
>> I am unable to reproduce the problem. I even tweaked the reproducer
>> to launch 10 procs and 100 threads.
>>
>> Can you test the following patch with your setup
>>
>> Here it is - also attached.
> 
> Hi Shuah,
> 
> I get the crash below with this change. It complains about
> kthread_stop_put() being called in atomic context.
> 

Thanks for testing. I was concerned about that. I will try to
reproduce the problem again.

I am running into a amd_gpu issue during boot on my test system
with KASAN enabled which results in disabling lock debugging. This
makes it harder to debug and fix this null-ptr-deref Write in
event_handler as it needs KASAN enabled. Fun stuff.

I will switch to a different test system and see if I can reproduce
the problem first.

Thanks again for testing.

thanks,
-- Shuah

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