On 28.05.24 00:01, Christian Heusel wrote: > > Savyasaachi reports that scanning for other stations in monitor mode > does not work anymore with his RTL8821CE wireless network card for linux > kernels after 6.8.9. Thx for the report. A few remarks: Please be more specific in cases like this, as "kernels after 6.8.9" can mean "6.8.10+", "6.10-rc", or "6.9.y" (apparently it is the latter). Yes, this is nitpicking, which is why I normally would not have said anything -- but because you frequently report bugs it's likely in everybody's interest to bring this up. In a case like this it would also be good if the reporter could give latest mainline a try, as (1) a fix might already be in there and (2) some developers do not care at all about bugs in stable kernels (and they are free to do so!). See https://linux-regtracking.leemhuis.info/post/frequent-reasons-why-linux-kernel-bug-reports-are-ignored/ for details. And sorry, there is something else: from the dmesg it looks a lot like this report is from a patched vendor kernel that among others seems to enable features like "forced interrupt request threading" (https://github.com/zen-kernel/zen-kernel/wiki/Detailed-Feature-List ). Such changes even if small and done carefully can lead to bugs like this (yes, that particular feature I mentioned can be enabled through a kernel parameter as well, but some developers would consider this to be an unsupported configuration). The absolut minimum you should have done is to mention that; but normally you never want to use such kernels for reporting bugs upstream, as the problem might not be present in the upstream code. Ciao, Thorsten > His workflow was putting the adapter in monitor mode by running > "airmon-ng start wlan0" and then capture the surrounding stations with > "airodump-ng wlan0". > > We have bisected the issue together in the issue in the Arch Linux > bugtracker[0] down to the following commit: > > 0a44dfc070749 ("wifi: mac80211: simplify non-chanctx drivers") > > Savyasaachi (in CC) offered to be available for questions and further > debugging in this thread and some general debugging outputs are > attached/below. > > Reported-by: Savyasaachi Vanga <savyasaachiv@xxxxxxxxx> > Bisected-by: Christian Heusel <christian@xxxxxxxxx> > > Cheers, > Chris > > [0]: https://gitlab.archlinux.org/archlinux/packaging/packages/linux/-/issues/54 > > --- > > #regzbot link: https://gitlab.archlinux.org/archlinux/packaging/packages/linux/-/issues/54 > #regzbot introduced: 0a44dfc070749 > #regzbot title: wifi: RTL8821CE does not work in monitor mode > > --- > > lsusb: > > Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub > Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub > Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub > Bus 003 Device 002: ID 0bda:c829 Realtek Semiconductor Corp. Bluetooth Radio > Bus 003 Device 003: ID 0c45:6739 Microdia Integrated_Webcam_FHD > Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub > > lspci: > > 00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne Root Complex > 00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne IOMMU > 00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge > 00:01.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne PCIe GPP Bridge > 00:01.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne PCIe GPP Bridge > 00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge > 00:02.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne PCIe GPP Bridge > 00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge > 00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir Internal PCIe GPP Bridge to Bus > 00:08.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir Internal PCIe GPP Bridge to Bus > 00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 51) > 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] Cezanne Data Fabric; Function 0 > 00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fabric; Function 1 > 00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fabric; Function 2 > 00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fabric; Function 3 > 00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fabric; Function 4 > 00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fabric; Function 5 > 00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fabric; Function 6 > 00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fabric; Function 7 > 01:00.0 Non-Volatile memory controller: Micron Technology Inc 2210 NVMe SSD [Cobain] (rev 03) > 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet Controller (rev 15) > 03:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8821CE 802.11ac PCIe Wireless Network Adapter > 04:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Barcelo (rev c2) > 04:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Renoir Radeon High Definition Audio Controller > 04:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 10h-1fh) Platform Security Processor > 04:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne USB 3.1 > 04:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne USB 3.1 > 04:00.5 Multimedia controller: Advanced Micro Devices, Inc. [AMD] ACP/ACP3X/ACP6x Audio Coprocessor (rev 01) > 04:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h/19h HD Audio Controller > 05:00.0 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI mode] (rev 81) > 05:00.1 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI mode] (rev 81)
