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From:   Emmanuel Grumbach <egrumbach@gmail.com>
Date:   Mon, 10 Jun 2019 09:50:13 +0300
Message-ID: <CANUX_P3jUBREM=cwLHs8LE+ZbUVKGZNsBWGGepbS-mcHq0w9ow@mail.gmail.com>
Subject: Re: iwlwifi module crash
To:     Balakrishnan Balasubramanian <linux-wireless-list@balki.me>
Cc:     linux-wireless <linux-wireless@vger.kernel.org>
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On Fri, Jun 7, 2019 at 2:41 PM Balakrishnan Balasubramanian
<linux-wireless-list@balki.me> wrote:
>
> > This is because the device is removed from the PCI bus. Nothing from
> > iwlwifi side can be done.
>
> I am sure the device is not physically disturbed. If that was the case, should it not stay down when restarting the system?

Not necessarily. The disturbance may impact ASPM or something alike.

>
> > If that happens upon suspend / resume, I know there are been fixes in
> > PCI bus driver.
>
> To my knowledge I have disabled all power/suspend features and I don't see releated logs in journal except the below. Not sure if relevant.
>
>     Jun 03 21:33:14 zadesk kernel: wlan0: Limiting TX power to 14 (17 - 3) dBm as advertised by d4:5d:df:25:ee:90
>
> Is there a way to restart the module safely without restarting the system?

echo 1 > /sys/module/iwlwifi/devices/0000\:02\:00.0/remove
echo 1 > /sys/bus/pci/rescan

>
> Regards,
> Bala
>
>
> On Friday, June 7, 2019 5:25:41 AM EDT Emmanuel Grumbach wrote:
> > On Fri, Jun 7, 2019 at 5:22 AM Balakrishnan Balasubramanian
> >
> > <linux-wireless-list@balki.me> wrote:
> > > I am using iwd demon for wifi. Once a while I loose connectivity.
> > > Restarting the demon does not help. But once I restart the system, it
> > > starts working fine. Attaching stack trace from journal.
> >
> > This is because the device is removed from the PCI bus. Nothing from
> > iwlwifi side can be done.
> > If that happens upon suspend / resume, I know there are been fixes in
> > PCI bus driver. If not, check that the device sits correctly in its
> > socket.
> >
> > > Regards,
> > > Bala
> > >
> > >
> > > ---------- Forwarded message ----------
> > > From: Denis Kenzior <denkenz@gmail.com>
> > > To: Balakrishnan Balasubramanian <iwd-lists@balki.me>, iwd@lists.01.org
> > > Cc:
> > > Bcc:
> > > Date: Thu, 06 Jun 2019 18:07:40 -0500
> > > Subject: Re: iwd crashes randomly
> > > Hi Bala,
> > >
> > > On 06/06/2019 06:00 PM, Balakrishnan Balasubramanian wrote:
> > > > Sometimes after a week and sometimes after two days. Once crashed,
> > > > restarting the service does not help. Had to restart the computer.
> > > > Attaching stack trace from journal.
> > >
> > > That implies that your kernel is crashing, not iwd.  The attached log
> > > shows a kernel stack trace somewhere inside iwlwifi module.  I would
> > > post this trace to linux-wireless@vger.kernel.org.
> > >
> > > If you have an associated iwd backtrace, then certainly post this here,
> > > but if the kernel module is crashing, there isn't much we can do.
> > >
> > > Regards,
> > > -Denis
>
>
>
>