linux-kernel - wlwifi AX201: WARN_ON in iwl_mvm_mld_mac_ctxt_cmd_common repeated UMAC FW crashes on 6.16-rc2

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Message-ID: <010701979879f871-db0f9edf-6eeb-4bae-8fa9-f3110c40e83a-000000@eu-central-1.amazonses.com>
Date: Sun, 22 Jun 2025 16:30:19 +0000
From: Damian Tometzki <damian@...cv-rocks.de>
To: miriam.rachel.korenblit@...el.com
Cc: linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: wlwifi AX201: WARN_ON in iwl_mvm_mld_mac_ctxt_cmd_common repeated
 UMAC FW crashes on 6.16-rc2

Hi Miri,
Hi all,

with v6.16-rc2 I consistently hit a Wi-Fi firmware crash on a
Lenovo ThinkPad X1 Carbon Gen 9.

Hardware / FW
-------------
 * NIC  : Intel Wi-Fi 6 AX201 160 MHz (PCI ID a0f0:0070, rev 0x351)
 * FW   : 77.864baa2e.0 QuZ-a0-hr-b0-77.ucode (auto-loaded)
 * BIOS : N32ET96W (1.72)
 * Platform: 20XWCTO1WW

Kernel: 6.16.0-rc2 #440 PREEMPT(lazy)

Symptoms
--------
Immediately after NetworkManager (or plain `ip link set wlp0s20f3 up`)
the driver warns:

    WARNING at drivers/net/wireless/intel/iwlwifi/mvm/mld-mac.c:37
    iwl_mvm_mld_mac_ctxt_cmd_common+0x175/0x1d0

The firmware then aborts:

    FW error in SYNC CMD MAC_CONFIG_CMD
    NMI_INTERRUPT_UMAC_FATAL
    ADVANCED_SYSASSERT 0x20103126
    Microcode SW error detected. Restarting 0x0.

The cycle repeats every few seconds; the interface never becomes usable.
Full dmesg attached.

-- 
VG
Demian Tometzki

View attachment "dmesg.txt" of type "text/plain" (269425 bytes)