linux-firmware-mediatek v20250917-1 prevents network subsystem from starting and tanks performance.

Description:

core/linux-firmware-mediatek@20250917-1 causes network to fail startup and dramatically slows down basically every operation in the kernel. symptoms are a pegged kworker thread at 100% cpu util, shutdown being prevented, extremely slow commands like sudo, filesystem access. I suspect a interrupt storm of some sort.

Downgrading to 20250808-1 resolves the issue.

Additional info:

core/linux-firmware-mediatek@20250917-1
01:00.0 Network controller: MEDIATEK Corp. MT7922 802.11ax PCI Express Wireless Network Adapter

Steps to reproduce:

1. pacman -S core/linux-firmware-mediatek@20250917-1
2. systemctl reboot

---------------------------------------------- other details ----------------------------------------------
system is fully up to date except for linux-firmware-mediatek and is operating normally.

 sudo pacman -Syu
[sudo] password for user: 
:: Synchronizing package databases...
 core is up to date
 extra is up to date
 multilib is up to date
 wds                                                                                                                                            2.3 KiB  3.82 KiB/s 00:01 [----------------------------------------------------------------------------------------------------------] 100%
:: Starting full system upgrade...
resolving dependencies...
looking for conflicting packages...

Package (1)                   Old Version  New Version  Net Change

core/linux-firmware-mediatek  20250808-1   20250917-1     0.88 MiB

Total Installed Size:  23.72 MiB
Net Upgrade Size:       0.88 MiB

:: Proceed with installation? [Y/n]

lspci
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Phoenix Root Complex
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Phoenix IOMMU
00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Phoenix Dummy Host Bridge
00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Phoenix Dummy Host Bridge
00:02.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Phoenix GPP Bridge
00:02.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Phoenix GPP Bridge
00:02.4 PCI bridge: Advanced Micro Devices, Inc. [AMD] Phoenix GPP Bridge
00:03.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Phoenix Dummy Host Bridge
00:03.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 19h USB4/Thunderbolt PCIe tunnel
00:04.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Phoenix Dummy Host Bridge
00:04.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 19h USB4/Thunderbolt PCIe tunnel
00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Phoenix Dummy Host Bridge
00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Phoenix Internal GPP Bridge to Bus [C:A]
00:08.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Phoenix Internal GPP Bridge to Bus [C:A]
00:08.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Phoenix Internal GPP Bridge to Bus [C:A]
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 71)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Phoenix Data Fabric; Function 0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Phoenix Data Fabric; Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Phoenix Data Fabric; Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Phoenix Data Fabric; Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Phoenix Data Fabric; Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Phoenix Data Fabric; Function 5
00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Phoenix Data Fabric; Function 6
00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Phoenix Data Fabric; Function 7
01:00.0 Network controller: MEDIATEK Corp. MT7922 802.11ax PCI Express Wireless Network Adapter
03:00.0 Non-Volatile memory controller: Kingston Technology Company, Inc. NV3 NVMe SSD [TC2201] (DRAM-less)
c4:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] HawkPoint1 (rev c4)
c4:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Radeon High Definition Audio Controller [Rembrandt/Strix]
c4:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Phoenix CCP/PSP 3.0 Device
c4:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15b9
c4:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15ba
c4:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h/19h/1ah HD Audio Controller
c5:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc. [AMD] Phoenix Dummy Function
c5:00.1 Signal processing controller: Advanced Micro Devices, Inc. [AMD] AMD IPU Device
c6:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc. [AMD] Phoenix Dummy Function
c6:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15c0
c6:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15c1
c6:00.5 USB controller: Advanced Micro Devices, Inc. [AMD] Pink Sardine USB4/Thunderbolt NHI controller #1
c6:00.6 USB controller: Advanced Micro Devices, Inc. [AMD] Pink Sardine USB4/Thunderbolt NHI controller #2

installled.packages.txt