On Sun, Sep 08, 2019 at 08:31:55PM +0000, Bryan Stenson wrote:
> Hi all -
> 
> I'm writing to "misc" rather than "bugs" as I'm not yet sure this is a
> bug.  I'm hoping to help triage this with assistance from this list.
> 
> I'm running -CURRENT and the iwn(4) driver for my wireless card.  Over
> the past year, this has been working great, but recently (within the
> last month or so), I've had issues where the NIC just stops working
> after a few hours of usage.  I don't have a solid steps for
> reproduction.
> 
> I realize "stops working" is not a very accurate account here...but
> I'm confused on how to get more descriptive information of the
> problem.  When it stops, "ifconfig" shows iwn0 with an IP address, but
> I'm unable to ping.  Additionally, I'm not seeing any
> warnings/messages in "dmesg" about the device...so I'm confused.
> 
> A simple "ifconfig iwn0 down; sh /etc/netstart iwn0" seems to fix the
> problem, but I haven't had to do that in the past...it just feels like
> a recent change (iwn(4) work?) has put me in this state.
> 
> I'm really wanting to help here.  How can I run the iwn(4) in debug
> mode, or increase logging verbosity?  And/or, should I try to capture
> packets via tcpdump?  And/or, can I run an older bsd.mp (without
> having to downgrade packages to older versions) in order to try and
> "bisect" where the problem may have been introduced?

Please enable debugging with 'ifconfig iwn0 debug' and when the problem
reoccurs check whether you can find any relevant information in the
file /var/log/messages.

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