Bug 216397

Summary:	Kernel 5.19 with NetworkManager and iwd: Wifi reconnect on resume is broken
Product:	Drivers	Reporter:	Vorpal (kernelbugs)
Component:	network-wireless-intel	Assignee:	Default virtual assignee for network-wireless-intel (drivers_network-wireless-intel)
Status:	NEEDINFO ---
Severity:	normal	CC:	andyrtr, dereklh24, jlinenkohl, kernel+bugzilla, plumerlis
Priority:	P1
Hardware:	Intel
OS:	Linux
Kernel Version:	5.19.3	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	Relevant journalctl.txt

Description Vorpal 2022-08-22 16:35:21 UTC

Created attachment 301630 [details]
Relevant journalctl.txt

After upgrading to kernel 5.19 (Arch Linux kernel, which is minimally modified, but I tested a few alternative kernels too, such as zen), wifi reconnect on resume is broken when using NetworkManager + iwd.

When downgrading to 5.18 or linux-lts (5.15.62), auto reconnect starts working again.

When switching NetworkManager to use wpa_supplicant auto reconnect starts working on newer kernel again.

Manual reconnection works using iwd+new kernel.

Hardware:
* Lenovo Thinkpad T480 with "Intel Corporation Wireless 8265 / 8275 (rev 78)" (according to lspci).
* Access point is a Asus AC-68U running the Asus Merlin Firmware.

I have another laptop, with Atheros wifi and the same Arch Linux with NM + iwd setup. It does not suffer from this problem. This appears to be specific to this hardware.

I have attached the relevant fragment of dmesg/journalctl (MAC addresses and SSID changed for privacy).

Additional info:
* Arch Linux package version(s):
- linux-5.19.3.arch1-1 (also affects 5.19.2 at least)
- networkmanager-1.38.4-1
- iwd-1.29-1 (broken)
- wpa_supplicant-2:2.10-5 (works)

Steps to reproduce:
1. Suspend computer with iwlwifi using NetworkManager + iwd
2. After computer has gone to sleep, wake it up
3. Observe failure to reconnect to wifi network that was connected before.

I do not know if this is a kernel bug, IWD bug or Network Manager bug. Perhaps it is just how they interact.

Distro bug report: https://bugs.archlinux.org/task/75670

Comment 1 Emmanuel Grumbach 2022-08-26 14:34:05 UTC


*** This bug has been marked as a duplicate of bug 215937 ***

Comment 2 Blanche Schaefer 2022-08-30 15:20:40 UTC

I have similar hardware and system setup and faced same issue since linux 5.19. 

Neither logs posted above or my own mention iwlmei, it's just the:

iwlwifi 0000:04:00.0: Not associated and the time event is over already...

I also rebuild kernel with CONFIG_IWLMEI=n and it didn't make any difference so I don't think this bug should be duplicate of https://bugzilla.kernel.org/show_bug.cgi?id=215937 . Please re-open it.

Comment 3 Blanche Schaefer 2022-08-30 19:16:33 UTC

Also the aforementioned bug was originally reported for kernel 5.17 while this one didn't occur before 5.19

Comment 4 plum 2022-09-05 14:15:00 UTC

I have same issue
https://bugzilla.redhat.com/show_bug.cgi?id=2118137

Comment 5 Emmanuel Grumbach 2022-09-08 19:23:47 UTC

Vorpal, can you tell us if compiling IWLMEI out helps.
If yes, I'll ask Blanche to open a new bug.

Comment 6 Vorpal 2022-09-08 22:19:44 UTC

(In reply to Emmanuel Grumbach from comment #5)
> Vorpal, can you tell us if compiling IWLMEI out helps.
> If yes, I'll ask Blanche to open a new bug.

I'm currently way too busy to set up and recompile a kernel, but I should have some time to try this during next week.

Comment 7 Vorpal 2022-09-09 08:29:22 UTC

I ended up getting time to do this much sooner than I expected. I can confirm that disabling iwlmei does not affect this.

Comment 8 Justin Linenkohl 2022-11-15 09:34:28 UTC

Any chance that this is related to my remarks re: SSID not being returned by nl80211 CMD_GET_INTERFACE?  I have not tried to reproduce the symptoms described here in 216397, but think perhaps NetworkManager and similar "network config daemons" might also be affected as it's not an issue _in_ them but rather a symptom of the missing netlink return data.  Like I mention in "iw --debug" and systemd-251-3 atop Linux 5.19.2 and beyond.

# details
https://github.com/systemd/systemd/issues/24585

# other reports
https://github.com/systemd/systemd/issues/25384
https://github.com/systemd/systemd/issues/24411

# Yu Watanabe (yuwata) - systemd - also reported to Red Hat back in Sept 2022.
https://bugzilla.redhat.com/show_bug.cgi?id=2124670


I have not reported to jmberg-intel as I know he was quite busy Sept/Oct but was curious if a bug report exists or anyone else is tracking/testing this as I spent a good chunk of time on it and hope to spare others the discovery time...

Thanks.

-Justin