Ubuntu
linux-raspi package

  1. Bug #1861936
  2. Comment #63

Comment 63 for bug 1861936

Revision history for this message
Christopher Yates (scubachristopher) wrote :

RPI 3B+. My configuration is as follows:
Raspian (buster)
5.4.51-v7+#1333 SMP Mon Aug 10 16:45:19 BST 2020

wlan0 AP, no bridge, fixed IP.
wlan1 USB Wifi adapter
ppp0 Hologram Nova Modem

My application is in the field, so Wifi HotSpots can be unreliable (I can get an IP but can't connect). So I watch to see if I can get to the internet through wlan1 and if I cannot, I switch to cellular. Once on cellular, I look to see if I can get to the Internet via wlan1 (cheaper / faster) by ifconfig wlan1 up.

When I do connect, I am sending a lot of data. Hard to pin what actions are triggering the NETDEV WATCHDOG backtrace, but it leaves wlan1 in a state where it cannot come up again:

SIOCSIFFLAGS: No such device

ip address shows wlan1: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN group default qlen 1000

vcgencmd shows:
Aug 6 2020 16:24:09
version af3...d5b337 (clean) (release) (start)

Not clear this is the same issue, but I thought I'd report as a use case.