linux-kernel - Re: KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] - RIP: 0010:amdgpu_bo_get

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Message-ID: <CABXGCsOWCp=KYFFvWA6ExUotUJe=YViZEsomqkCJb7dwNUFAwg@mail.gmail.com>
Date:   Mon, 8 May 2023 15:40:08 +0500
From:   Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
To:     "Olsak, Marek" <Marek.Olsak@....com>,
        Christian König <Christian.Koenig@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>
Subject: Re: KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
 - RIP: 0010:amdgpu_bo_get_memory+0x80/0x360 [amdgpu]

On Fri, May 5, 2023 at 6:44 PM Mikhail Gavrilov
<mikhail.v.gavrilov@...il.com> wrote:
> I need to say that it may not be easy to reproduce this bug.
> For helping reproduce:
> 1. I looped script above:
> $ for i in {1..99999}; do sudo curl -s
> https://raw.githubusercontent.com/fatso83/dotfiles/master/utils/scripts/inotify-consumers
> | bash; done
> 2. Launched google chrome with 26 opened windows
> 3. And played in the game Division 2.
> A little time and luck and I get the desired backtrace again and again.
>
> I am ready to answer any question and open for testing any patches.
> Thanks.

No one can reproduce this?
I prepared a video instruction which can helps:
https://youtu.be/0ipQnMpZG1Y

1. Run script which would calculate watchers:
$ for i in {1..99999}; do sudo curl -s
https://raw.githubusercontent.com/fatso83/dotfiles/master/utils/scripts/inotify-consumers
| bash; done

2. Run the game "Devision 2"

3. Run 20 windows of Google Chrome with such script
$ for i in {1..20}; do google-chrome-unstable
--profile-directory="Test-2" --new-window --start-maximized
"youtube.com" &; done

I hope after it you see the desired backtrace.

-- 
Best Regards,
Mike Gavrilov.