Created attachment 255863 [details]
dmesg captured after - driver crash, but kernel remained working
This bug is known in the wild, but some of the bugs were closed, so I reopen it here.
I have WPA2 network in the office and without issues I load data whole day(s). But on some of the WPA2 secured networks I experience lot of error messages and soon or later kernel panic.
I experience this personally on Dell XPX 15 9650 with wifi net card:
Network controller: Broadcom Corporation BCM43602 802.11ac Wireless LAN SoC (rev 01)
This is only happening on some WPA2 secured networks, I never experienced this behavior.
Just additional info, in some cases kernel were able to continue operation (2 out of 10 cases) and just reported stack about driver crash, in other situations (8 out of 10 cases) it caused kernel panic directly
I can confirm this issue is still present in current kernels (occurred today on ae64f9bd1d3621b5e60d7363bc20afb46aede215 aka 4.15-rc2) on a Dell XPS 15 9550 which has the same BCM43602 card:
02:00.0 Network controller: Broadcom Limited BCM43602 802.11ac Wireless LAN SoC (rev 01)
The issue seems to be related to the level of utilisation of the card. No panic nor non-fatal kernel errors occur during light usage (web, ssh, etc), but a panic will consistently occur within a few minutes of sustained heavy usage (rsyncing a large file to a LAN host, running a backup with borg, etc). I have not been able to capture a kdump nor the panic message as I've not been able to get kexec-on-panic to work on my machine.
This is also happening for me with Manjaro Linux an Kernel 4.18-7 on an Dell XPS 9550:
02:00.0 Network controller : Broadcom Limited BCM43602 802.11ac Wireless LAN SoC [14e4:43ba] (rev 01)
Subsystem: Dell BCM43602 802.11ac Wireless LAN SoC [1028:0020]
Flags: bus master, fast devsel, latency 0, IRQ 137
Memory at dd800000 (64-bit, non-prefetchable) [size=32K]
Memory at dd400000 (64-bit, non-prefetchable) [size=4M]
Capabilities: <access denied>
Kernel driver in use: brcmfmac
Kernel modules: brcmfmac
It happens when there is heavy load coming via WiFi. Hard crash with a blinking caps lock LED
For Dell XPS 15 owners.
As this issue follows me for too long, I am going to give try replacing the wifi module in Dell XPS 15 completely and give try to Intel Dual Band Wireless-AC 8260