Created attachment 284383 [details]
Folllowed directions on https://wireless.wiki.kernel.org/en/users/drivers/iwlwifi/debugging
Attaching dmesg and crash log, encrypted to the developers, as directed.
Created attachment 284385 [details]
firmware crash log
Created attachment 284387 [details]
From a user perspective, network traffic suddenly stops. Typing "ip addr" shows no address associated with the wireless interface. But NetworkManager still shows the device as connected.
Disconnecting / Reconnecting temporarily resolves the problem.
Starting a large number of connections (such as "apt-get update") usually causes the problem to reoccur.
I am running Ubuntu Disco with the lowlatency kernel:
Maintainer: Ubuntu Kernel Team <email@example.com>
Installed-Size: 15.4 kB
Depends: linux-image-lowlatency (= 18.104.22.168.26), linux-headers-lowlatency (= 22.214.171.124.26)
Download-Size: 1,860 B
APT-Sources: http://security.ubuntu.com/ubuntu disco-security/main amd64 Packages
Description: Complete lowlatency Linux kernel
This package will always depend on the latest complete lowlatency Linux kernel
bobvin@T560:~/Downloads/iwlwifi-bug-report ethtool -i wlp4s0 | grep firmware
*** This bug has been marked as a duplicate of bug 203315 ***