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From:   Balakrishnan Balasubramanian <linux-wireless-list@balki.me>
To:     Emmanuel Grumbach <egrumbach@gmail.com>,
        linux-wireless <linux-wireless@vger.kernel.org>
Subject: Re: iwlwifi module crash
Date:   Fri, 07 Jun 2019 07:41:02 -0400
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> 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?

> 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?

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