netdev - Re: NULL pointer dereference when removing xmm7360 PCI device

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Date:   Thu, 27 Apr 2023 14:08:19 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     M Chetan Kumar <m.chetan.kumar@...el.com>
Cc:     Samuel Wein PhD <sam@...wein.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Intel Corporation <linuxwwan@...el.com>
Subject: Re: NULL pointer dereference when removing xmm7360 PCI device

On Thu, 27 Apr 2023 10:31:29 +0000 Samuel Wein PhD wrote:
> Hi Folks,
> I've been trying to get the xmm7360 working with IOSM and the ModemManager. This has been what my highschool advisor would call a "learning process".
> When trying `echo 1 > /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/remove` I get a variety of errors. One of these is a kernel error
> `2023-04-27T12:23:38.937223+02:00 Nase kernel: [  587.997430] BUG: kernel NULL pointer dereference, address: 0000000000000048
> 2023-04-27T12:23:38.937237+02:00 Nase kernel: [  587.997447] #PF: supervisor read access in kernel mode
> 2023-04-27T12:23:38.937238+02:00 Nase kernel: [  587.997455] #PF: error_code(0x0000) - not-present page
> 2023-04-27T12:23:38.937241+02:00 Nase kernel: [  587.997463] PGD 0 P4D 0 
> 2023-04-27T12:23:38.937242+02:00 Nase kernel: [  587.997476] Oops: 0000 [#1] PREEMPT SMP NOPTI
> 2023-04-27T12:23:38.937242+02:00 Nase kernel: [  587.997489] CPU: 1 PID: 4767 Comm: bash Not tainted 6.3.0-060300-generic #202304232030
> ...
> `
> the full log is available at https://gist.github.com/poshul/0c5ffbde6106a71adcbc132d828dbcd7
> 
> Steps to reproduce: Boot device with xmm7360 installed and in PCI mode, place into suspend. Resume, and start issuing reset/remove commands to the PCI interface (without properly unloading the IOSM module first).
> 
> I'm not sure how widely applicable this is but wanted to at least report it.

Intel folks, PTAL.