Re: [REGRESSION] iwlwifi 8265 firmware ADVANCED_SYSASSERT in PHY_CONTEXT_CMD on roam (v7.0.3..v7.0.5)

[Branislav Klocok <branislav.klocok@ofz.sk>]

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Hi Johannes,

Thanks for the quick check. I dug a bit further; the v7.0.3..v7.0.5 
window is what I empirically see (clean -> crashing on every 
controller-driven roam), but the cause likely sits outside iwlwifi as 
you suggested.

What I can confirm from the openSUSE Tumbleweed packaging side:

- Between kernel-default-7.0.3-1.1 (installed 2026-05-08 21:45) and 
7.0.5-1.1 (2026-05-10 21:25), only the kernel package changed. 
kernel-firmware-intel was bumped to 20260505-1.1 in the same transaction 
as 7.0.3 on 2026-05-08 and stayed unchanged across the 7.0.5 install 
(8265 ucode 36.c8e8e144.0 is identical in both dmesg banners). 
NetworkManager 1.54.3-3.4 and wpa_supplicant 2.11-6.3 were last touched 
on 2026-05-04, also unchanged across this window. Userspace and firmware 
blob can be ruled out as the trigger.

- The only iwlwifi-touching SUSE patch added between the 7.0.3 and 7.0.5 
source packages is iwlwifi-declare-missing-firmware-files.patch in 
7.0.4, which is metadata-only (it just adds MODULE_FIRMWARE() entries). 
The rest of the diff is plain stable v7.0.3..v7.0.5.

- Caveat on my "7.0.3 worked" claim: it is based on a short boot into 
7.0.3 on 2026-05-11 before booting 7.0.5; I will re-test 7.0.3 over a 
longer window with forced roams to be sure.

Crash itself: ADVANCED_SYSASSERT (0x000014FD) + NMI_INTERRUPT_LMAC_FATAL 
(0x70) on PHY_CONTEXT_CMD during nl80211_authenticate. ~87 % of 
controller-driven roams trigger it (14/16 observed); cascading restart 
loops (6x in 23 s) on bad days. NM powersave=2 (CAM) does not suppress 
it. Full journal at https://bugzilla.kernel.org/show_bug.cgi?id=221512 
(attachment 310106).

A couple of questions, if you have a moment:

1. Is there an iwlmvm debug knob you'd like enabled on the next 
reproduction (iwlwifi.debug=, devcoredump, fw_dbg_collect) to capture 
more on what PHY_CONTEXT_CMD is hitting?

2. Given iwlwifi/mac80211 is unchanged, would you point at a tighter 
candidate area in v7.0.3..v7.0.5 (PCI PM, firmware loader, scheduler) 
before I attempt a bisect across the full tree?

*-- *
S pozdravom / Best regards
*Branislav Klocok *
*generálny riaditeľ / general director *


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Dňa 13. 5. 2026 o 12:41 Johannes Berg napísal(a):
> On Wed, 2026-05-13 at 12:35 +0200, Branislav Klocok wrote:
>>   #regzbot introduced: v7.0.3..v7.0.5
> That cannot be right, there are no patches for wifi between those except
> a handful in drivers you're not running.
>
> johannes


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