Comment # 4 on bug 1186194 from Libor Pechacek

Created attachment 850414 [details]
Output of SysRq-T with kernel 5.12.4-1.g92853b5-default

Although I didn't manage to replicate the freeze at will, it does happen more
frequently with the "docking" station that arrived today. So, I installed the
test kernel from bug 1174886 and the freeze happened even with the proposed
fix.

----------------------8<----------------------
lpechacek@fmn:~> pgrep -war D 
7 kworker/0:1+ipv6_addrconf
1679 /usr/sbin/NetworkManager --no-daemon
1688 /usr/sbin/NetworkManager --no-daemon
1689 /usr/sbin/NetworkManager --no-daemon
1813 /usr/sbin/wpa_supplicant -c /etc/wpa_supplicant/wpa_supplicant.conf -u -t
-f /var/log/wpa_supplicant.log
6530 kworker/u16:0+netns
7008 kworker/3:2+events
7010 kworker/3:3+pm
7608 kworker/u17:2+i915_flip
7715 net usershare info
8117 ip --color=auto ne
lpechacek@fmn:~> uname -a
Linux fmn 5.12.4-1.g92853b5-default #1 SMP Tue May 18 12:02:48 UTC 2021
(92853b5) x86_64 x86_64 x86_64 GNU/Linux
---------------------->8----------------------

The output of SysRq-T is attached.

Disabling autosuspend for the network adapter (`echo on >
/sys/devices/pci0000\:00/0000\:00\:14.0/usb2/2-4/2-4.3/power/control`) helps to
prevent the issue.