LinuxQuestions.org - [SOLVED] kernel panic with newly compiles module

- Slackware - ARM (https://www.linuxquestions.org/questions/slackware-arm-108/)

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kernel panic with newly compiles module

I have done an in tree compile of the rtl8812u module. I can load it using modprobe and when I insert the usb dongle it is recognised and functional.

However, if I boot with the wifi dongle inserted or if I insert it after the system is up I get a kernel panic.

Code:

[ end Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: r8712_efuse_pg_packet_read+0x80/0x1b8 [r8712u] ]

Perhaps someone can explain the problem. I have in the past just enabled this module and compiled the kernel and all modules at the same time (too much time) and had a good r8712u.ko module but this time I just compiled the module in tree with

Code:

# make modules_prepare

# make M=drivers/staging/rtl8712

after saving .config. Did I miss a step along the way?

Seems like the wrong module is loaded/used if the correct module isn't loaded first. Add "/sbin/modprobe rtl8812u" to /etc/rc.d/rc.modules.local

Thanks for the reply. Using rc.modules_local I can boot with the wifi dongle inserted and not get a kernel panic. I can the use iwconfig to set up the device but after 'ifconfig up' when I try to run iwlist wlan0 scan I have a kernel panic with the same message.

This wireless dongle had been working with slackwarearm current from back in May on this same BananaPro only in that install I had compiled a new kernel and set of modules. I have another exact same setup that has been running panic free for over a year. It there must have been something wrong or that I neglected to do yesterday when I compiled that module. Here's some infe from the one running in my garden shed.

Code:

root@bpro9:/home/rick# uname -r

4.8.15-armv7

root@bpro9:/home/rick# lsusb                                                                  

Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Bus 002 Device 002: ID 046d:0805 Logitech, Inc. Webcam C300

Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Bus 001 Device 002: ID 0b05:1791 ASUSTek Computer, Inc. WL-167G v3 802.11n Adapter [Realtek RTL8188SU]

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

root@bpro9:/home/rick# lsmod | grep r8712u                                                            

r8712u                142699  0

usbcore              152045  22 ehci_orion,uvcvideo,ehci_tegra,usbhid,snd_usb_audio,ums_isd200,usb_storage,r8712u,ums_cypress,ehci_hcd,ums_usbat,ums_jumpshot,ums_freecom,uhci_hcd,ums_onetouch,snd_usbmidi_lib,ums_alauda,ohci_hcd,ums_sddr09,ums_sddr55,ehci_platform,ohci_platform

@justwantin

The kernel wireless wiki page lists rtl8192su for your adapter (considering the output of your lsusb):
https://wireless.wiki.kernel.org/en/...rivers/rtl819x

Quote:

rtl8192su is a USB driver for RTL8188SU/RTL8191SU/RTL8192SU devices. (WIP: http://github.com/chunkeey/rtl8192su )

https://github.com/chunkeey/rtl8192su

Have you tried building and using that module? If your kernel (udev) loads a different module, you can always blacklist it by creating:
/lib/modprobe.d/blacklist-module-name.conf
containing the name of the module(s) you wish to blacklist.

I have had the exact same setup with a bananapro and the same wifi dongle running without problems for a very long time. I had the same wifi dongle working on this bananapro up until I installed current 19/12/2019 and consequently needed to compile a new module.

Code:

Device drivers > Staging Drivers > Realtek RTL8712u (RTL8192SU) Wireless LAN NIC Driver

Code:

root@bpro9:/# lsusb

<snipped

Bus 001 Device 002: ID 0b05:1791 ASUSTek Computer, Inc. WL-167G v3 802.11n Adapter [Realtek RTL8188SU]

<snipped>

root@bpro9:/#

Code:

root@bpro9:/# lsmod | grep r8712u                          

r8712u                142699  0

usbcore              152045  22 ehci_orion,uvcvideo,ehci_tegra,usbhid,snd_usb_audio,ums_isd200,usb_storage,r8712u,ums_cypress,ehci_hcd,ums_usbat,ums_jumpshot,ums_freecom,uhci_hcd,ums_onetouch,snd_usbmidi_lib,ums_alauda,ohci_hcd,ums_sddr09,ums_sddr55,ehci_platform,ohci_platform

root@bpro9:/# lsmod | grep r8192su

I finally compiled a r8712u module. I think the problem may have been I did not run a make clean inside the source before compiling not sure. In any case I built and installed a module that will load at boot if the wife dongle is already inserted as well as load if inserted after boot without a kernel panic. So far so good but I've sat here long. I'll come back to it when I'm fresh.

OK, finally got around to configuring wifi on this dongle and wifi is working. I can most likely attribute my problem to not running make clean before I did anything else.

I may as well provide my steps for compiling a single module from the kernel source as installed in Slackware/Slackwarearm in case someone ends up in this thread looking for how to do it.

Code:

# cd /usr/src/linux

# make clean

# make menuconfig

Select m rtl8712 (found in Drivers > Staging) then Save and Exit menuconfig

# make modules_prepare

# make M=drivers/staging/rtl8712

At the end of the compile the ast line of stdout provides where the modules is in the kernel source tree.

<snipped>

  Building modules, stage 2.

  MODPOST 1 modules

  CC [M]  drivers/staging/rtl8712/r8712u.mod.o

  LD [M]  drivers/staging/rtl8712/r8712u.ko

Make a directory in the modules tree where the module belongs the copy the module to it.

# mkdir /lib/modules/5.4.5-armv7/kernel/drivers/staging/rtl8712u

# cp drivers/staging/rtl8712/r8712u.ko /lib/modules/5.4.5-armv7/kernel/drivers/staging/rtl8712

If you don't run depmod next the magic don't happen

# depmod -a