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From: Shuah Khan <skhan@linuxfoundation.org>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: Shuah Khan <shuah@kernel.org>,
	Valentina Manea <valentina.manea.m@gmail.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	LKML <linux-kernel@vger.kernel.org>,
	USB list <linux-usb@vger.kernel.org>,
	syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
	syzbot <syzbot+bf1a360e305ee719e364@syzkaller.appspotmail.com>,
	Nazime Hande Harputluoglu <handeharputlu@google.com>,
	Shuah Khan <skhan@linuxfoundation.org>
Subject: Re: KASAN: null-ptr-deref Write in event_handler
Date: Mon, 19 Oct 2020 09:22:21 -0600
Message-ID: <9887a296-b98e-ef2b-553f-448cd9ad72b6@linuxfoundation.org> (raw)
In-Reply-To: <CAAeHK+xpbCExXG2xP5xGBbMpJg4sesHLsMn++Qz47jfNELhXjQ@mail.gmail.com>

On 10/19/20 9:10 AM, Andrey Konovalov wrote:
> On Fri, Oct 16, 2020 at 9:48 PM Shuah Khan <skhan@linuxfoundation.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

  reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-05 13:59 syzbot
2020-10-05 14:04 ` Andrey Konovalov
2020-10-05 20:44   ` Shuah Khan
2020-10-07 13:56     ` Shuah Khan
2020-10-07 14:28       ` Andrey Konovalov
2020-10-07 15:48         ` Shuah Khan
2020-10-16 19:48           ` Shuah Khan
2020-10-19 15:10             ` Andrey Konovalov
2020-10-19 15:22               ` Shuah Khan [this message]
     [not found] ` <20201007103029.16388-1-hdanton@sina.com>
2020-10-09 14:37   ` Shuah Khan

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