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

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Message-ID: <SJ0PR11MB5008C45C06B1DDE78A8CC874D76B9@SJ0PR11MB5008.namprd11.prod.outlook.com>
Date:   Fri, 28 Apr 2023 09:21:19 +0000
From:   "Kumar, M Chetan" <m.chetan.kumar@...el.com>
To:     Samuel Wein PhD <sam@...wein.com>
CC:     Jakub Kicinski <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        linuxwwan <linuxwwan@...el.com>
Subject: RE: NULL pointer dereference when removing xmm7360 PCI device

> -----Original Message-----
> From: Jakub Kicinski <kuba@...nel.org>
> Sent: Friday, April 28, 2023 2:38 AM
> To: Kumar, M Chetan <m.chetan.kumar@...el.com>
> Cc: Samuel Wein PhD <sam@...wein.com>; netdev@...r.kernel.org;
> linuxwwan <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.

I tried reproducing the issue by following the steps you mentioned but so far could not
reproduce it. Could you please share the logs from boot-up and procedure you carried out in steps.

Once you boot-up the laptop, driver will be in working condition why device removal ?