wpa_supplicant and iwlwifi failing with "No buffer space available" since "kernel 5.4.0-56"

[Matthias Kuntze]

There are reproduce-able WiFi aborts with 20.04.1 LTS since update to kernel 5.4.0-56.

Behaviour: nm-applet shows a window to enter the WLAN key that is pre-filled. Hitting the "Connect" button reconnects the WiFi network for a small period.

The error occurs sometimes very often (e.g. 10 times/minute) or seldom (only one per day). You can see it in /var/log/syslog at the entry

>>> wpa_supplicant[xxx]: l2_packet_send - sendto: No buffer space available

As a result 4-Way-Handshake fails and after disconnection the new (old) key is requested.
>>> wpa_supplicant[xxx]: wlp3s0: WPA: 4-Way Handshake failed - pre-shared key may be incorrect
>>> NetworkManager[xxx]: <info> [xxx] device (wlp3s0): Activation: (wifi) disconnected during association, asking for new key

There are a lot of people having this problem (see discussion in german moderated forum:
>>> https://forum.ubuntuusers.de/topic/funknetz-schluessel-werden-staendig-abgefragt

See also BUG #1908823 and question #694566
>>> https://bugs.launchpad.net/ubuntu/+source/network-manager-applet/+bug/1908823
>>> https://answers.launchpad.net/ubuntu/+question/694566

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

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[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Klaus Bielke (k-bielke)]

This also affects kernel 5.4.0-58-generic.

[Swapnil Likhitkar (linpaws08)]

Is this issue fixed in the Kernel?
Also are there any steps to reproduce this issue?

Just to add I found a website highlighting a fix for this but I was unable to verify if the patch works, as I was unable to reproduce the scenario.

https://icode-best.translate.goog/i/24110440792771?_x_tr_sl=zh-CN&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=sc