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From: coldolt <andypalmadi@gmail.com>
Date: Mon, 15 Jan 2024 16:39:23 +0200
Message-ID: <CAJvGw+DQhBk_mHXeu6RTOds5iramMW2FbMB01VbKRA4YbHHDTA@mail.gmail.com>
Subject: [REGRESSION] 6.7 broke wifi "AP is in CSA process, reject auth"
To: ayala.beker@intel.com, gregory.greenman@intel.com, johannes.berg@intel.com, 
	linux-wireless@vger.kernel.org, regressions@lists.linux.dev
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I'm on Arch linux, updated the kernel from 6.6.10 -> 6.7.

Now it doesn't connect to my 5GHz wifi, to 2.4GHz it still connects.
Also the earlier kernel version still works. Output from "sudo dmesg |
grep -i wlp2s0":

> [    6.049600] iwlwifi 0000:02:00.0 wlp2s0: renamed from wlan0
> [  131.095861] wlp2s0: AP is in CSA process, reject auth
> [  132.143170] wlp2s0: AP is in CSA process, reject auth
> [  133.599906] wlp2s0: AP is in CSA process, reject auth
> [  135.549325] wlp2s0: AP is in CSA process, reject auth
> [  145.510438] wlp2s0: AP is in CSA process, reject auth

I notice that the commit c09c4f31998bac, which was added to kernel
6.7, introduced rejecting a connection with that error message "AP is
in CSA process, reject auth".

My guess is that commit is the cause of the regression.

I have a Dell E5550 laptop, lspci -k shows:

> 02:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59)
>        Subsystem: Intel Corporation Dual Band Wireless-AC 7265 [Stone Peak 2 AC]
>        Kernel driver in use: iwlwifi
>        Kernel modules: iwlwifi

Output from "sudo dmesg | grep -i wifi":

> [    5.198655] Intel(R) Wireless WiFi driver for Linux
> [    5.221823] iwlwifi 0000:02:00.0: enabling device (0000 -> 0002)
> [    5.230357] iwlwifi 0000:02:00.0: Detected crf-id 0x0, cnv-id 0x0 wfpm id 0x0
> [    5.230513] iwlwifi 0000:02:00.0: PCI dev 095a/5410, rev=0x210, rfid=0xd55555d5
> [    5.272339] iwlwifi 0000:02:00.0: Found debug destination: EXTERNAL_DRAM
> [    5.272344] iwlwifi 0000:02:00.0: Found debug configuration: 0
> [    5.273573] iwlwifi 0000:02:00.0: loaded firmware version 29.4063824552.0 7265D-29.ucode op_mode iwlmvm
> [    5.551806] iwlwifi 0000:02:00.0: Detected Intel(R) Dual Band Wireless AC 7265, REV=0x210
> [    5.565689] iwlwifi 0000:02:00.0: Applying debug destination EXTERNAL_DRAM
> [    5.566606] iwlwifi 0000:02:00.0: Allocated 0x00400000 bytes for firmware monitor.
> [    5.577802] iwlwifi 0000:02:00.0: base HW address: 34:02:86:17:53:27, OTP minor version: 0x0
> [    6.049600] iwlwifi 0000:02:00.0 wlp2s0: renamed from wlan0
> [    6.559212] iwlwifi 0000:02:00.0: Applying debug destination EXTERNAL_DRAM
> [    6.638617] iwlwifi 0000:02:00.0: Applying debug destination EXTERNAL_DRAM
> [    6.640695] iwlwifi 0000:02:00.0: FW already configured (0) - re-configuring
> [    6.657163] iwlwifi 0000:02:00.0: Registered PHC clock: iwlwifi-PTP, with index: 1
> [    6.710776] iwlwifi 0000:02:00.0: Applying debug destination EXTERNAL_DRAM
> [    6.790826] iwlwifi 0000:02:00.0: Applying debug destination EXTERNAL_DRAM
> [    6.792667] iwlwifi 0000:02:00.0: FW already configured (0) - re-configuring

#regzbot introduced: c09c4f31998bac