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Bug 2062785

Summary: [NMCI] simwifi_ap_wpa_psk_method_shared and simwifi_ap_in_bridge_wpa_psk_method_manual regressed again due to channel issue
Product: Red Hat Enterprise Linux 9 Reporter: Vladimir Benes <vbenes>
Component: NetworkManagerAssignee: Beniamino Galvani <bgalvani>
Status: CLOSED CURRENTRELEASE QA Contact: Desktop QE <desktop-qa-list>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 9.1CC: bgalvani, dcaratti, djasa, kbenoit, lrintel, rkhan, sukulkar, thaller, till, vbenes
Target Milestone: rcKeywords: Regression, Triaged
Target Release: ---Flags: pm-rhel: mirror+
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: 2032539 Environment:
Last Closed: 2022-03-14 08:24:31 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2032539    
Bug Blocks:    

Description Vladimir Benes 2022-03-10 15:26:46 UTC 
We are seeing regression in those two ap tests again. A workaround is to add 802-11-wireless.channel 1 802-11-wireless.band bg to profile creation.

Version:
NetworkManager-1.37.0-29798.copr.38290b1b86.el9.x86_64 (not exactly this one, no older available)


reproducer:
0. modprobe mac80211_hwsim
1. nmcli  connection add type wifi ifname wlan1 con-name wifi-ap ssid AP_test 802-11-wireless-security.key-mgmt wpa-psk 802-11-wireless-security.psk Secret123 mode ap ipv4.method shared

The profile should be connected instantly but stays in:
wlan1          wifi      connecting (configuring)  wifi-ap    

logs:
Mar 10 10:13:38 gsm-r5s7-01.wlan.rhts.eng.bos.redhat.com wpa_supplicant[94938]: nl80211: kernel reports: Channel is disabled
Mar 10 10:13:38 gsm-r5s7-01.wlan.rhts.eng.bos.redhat.com wpa_supplicant[94938]: nl80211: Failed to set channel (freq=2472): -22 (Invalid argument)


full log attached
Comment 4 Vladimir Benes 2022-03-10 15:32:16 UTC 
git revert 3f96fe734a2c1bb616052c289213a8d3418cb29b should revert to buggy behavior
Comment 5 Beniamino Galvani 2022-03-10 16:34:26 UTC 
Since https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/commit/f18bf17deaa5ccdc445c33d7e9a0334f1de399a6 , the hotspot channel is randomized when not explicitly set.

For SSID "AP_test", frequency 2472 is choosen, since it's reported as supported by the driver.

# iw reg get
global
country 00: DFS-UNSET
        (2402 - 2472 @ 40), (N/A, 20), (N/A)
        (2457 - 2482 @ 20), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
        (2474 - 2494 @ 20), (N/A, 20), (N/A), NO-OFDM, PASSIVE-SCAN
        (5170 - 5250 @ 80), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
        (5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS, AUTO-BW, PASSIVE-SCAN
        (5490 - 5730 @ 160), (N/A, 20), (0 ms), DFS, PASSIVE-SCAN
        (5735 - 5835 @ 80), (N/A, 20), (N/A), PASSIVE-SCAN
        (57240 - 63720 @ 2160), (N/A, 0), (N/A)

However, that frequency fails to be set:

# iw phy1 set freq 2472
kernel reports: Channel is disabled
command failed: Invalid argument (-22)

I don't know why...
Comment 6 Beniamino Galvani 2022-03-10 16:37:34 UTC 
With "iw phy phy1 info" I see:

                Frequencies:                                                                                           
                        * 2412 MHz [1] (30.0 dBm)                                                                      
                        * 2417 MHz [2] (30.0 dBm)                                                                      
                        * 2422 MHz [3] (30.0 dBm)                                                                      
                        * 2427 MHz [4] (30.0 dBm)                                                                      
                        * 2432 MHz [5] (30.0 dBm)                                                                      
                        * 2437 MHz [6] (30.0 dBm)                                                                      
                        * 2442 MHz [7] (30.0 dBm)                                                                      
                        * 2447 MHz [8] (30.0 dBm)                                                                                                                                                                                             
                        * 2452 MHz [9] (30.0 dBm)
                        * 2457 MHz [10] (30.0 dBm)
                        * 2462 MHz [11] (30.0 dBm)
                        * 2467 MHz [12] (disabled)
                        * 2472 MHz [13] (disabled)
                        * 2484 MHz [14] (disabled)

So, apparently the list of supported frequencies populated in nm_wifi_utils_nl80211_new() is not correct.
Comment 7 Thomas Haller 2022-03-11 09:00:41 UTC 
the bug existed for a long time, but it became only relevant since commit [1].

Vladimir, above patch was merged mid/end of February, but the CI only fails since 8th March. Do you know why that might be, and why it wasn't caught earlier?
[2] is the CI test for the merge-request that introduced [1].


[1] https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/commit/f18bf17deaa5ccdc445c33d7e9a0334f1de399a6.
[2] https://desktopqe-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/job/beaker-NetworkManager-gitlab-trigger-code-upstream/3114/artifact/artifacts/



What [1] does, it starts automatically choosing a channel, by hashing the SSID (the same should be chosen independently of architecture/host).
So we are lucky that NM-ci used a SSID that exposed the problem. But why only since 8th March?
Comment 8 Thomas Haller 2022-03-11 09:05:32 UTC 
ah, on main-veth-rhel7 they were failing earlier...

to bad, this should have been discovered earlier.

But the gitlab-ci integrated tests still pass (why?). Which is the one that we mostly look at.
Comment 9 Beniamino Galvani 2022-03-14 08:24:31 UTC 
Fixed on main branch.