Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

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andnovator
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Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by andnovator »

I installed (and reinstalled) Ubuntu 20.04 on microSD card, by Ubuntu 20.04 minimal image file (my ODROID-C2 is 2017 revision). Also I "installed" Lubuntu [ lxqt ] by tasksel (lubuntu-desktop "target"), by it doesn't matter (same problem with booting to "console only" "mode" [multi-user.target]). All apt repositories is default (from installation image).

I created l2tp/ipsec vpn connection by nmcli / NetworkManager GUI for my personal l2tp/ipsec VPN server (with PSK "auth"). So package network-manager-l2tp was installed.
The connection to the VPN server is successful.

When I disconnect from VPN server (by nmcli or NetworkManget GUI [by "icon" in the tray, network-manager-applet]), after ~ 5 seconds kernel panic occurs.

I'm tried once to reinstall system - same result with l2tp/ipsec. For example, PPTP works normally with NetworkManager (network-manager-pptp). I also tried to install only network-manager-l2tp (without network-manager-l2tp-gnome) - same result.

So... I don't know, "who" is "problem" - NetwokManager, network-manager-l2tp, libreswan ("dependency" for network-manager-l2tp) or even maybe xl2tpd, or something else.

I attached two photos of two kernal panic and OCR'ed text (.txt files) from kernel panic messages (on kp_20210414_002204.jpg - tail -f /var/log/syslog was running on tty1, when I disconnected from vpn on tty2 [and then logout from tty2 and switched to tty1]). 2021-03-17 - Ubuntu was installed from ubuntu-20.04-3.16-mate-odroid-c2-20200626.img (all Mate DE packages wsa removed after installing lubuntu-desktop by apt), 2021-04-14 - Ubuntu installed from ubuntu-20.04-3.16-minimal-odroid-c2-20210201.img.xz (lubuntu-desktop installed by tasksel).

Last kernel panic message:

Code: Select all

[ 198.416606] Kernel panic - not syncing: BUG !
[ 198.422782] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.16.85-65 #1
[ 198.429567] Call trace:
[ 198.435754] dump_backtrace+0x0/0xd8
[ 198.441932] show_stack+0x24/0x30
[ 198.448106] dump_stack+0x94/0xb8
[ 198.454127] panic+0xf8/0x23C
[ 198.460018] pppol2tp_sesslon_destruct+0xa4/0xc8 [l2tp_ppp]
[ 198.465916] __sk_free+0x2c/0xl40
[ 198.471802] sk_free+0x48/0x58
[ 198.477692] pppol2tp_put_sk+0x48/0x58 [l2tp_ppp]
[ 198.483617] rcu_process_callbacks+0x26c/0x650
[ 198.489557] __do_softirq+0x154/0x380
[ 198.495482] irq_exit+0x84/0xc8
[ 198.501379] handle_IRQ+0x84/0xf8
[ 198.507261] gic_handle_lrq+0x44/0x88
[ 198.513173] el1_irq+0x64/0xd0
[ 198.519086] cpu_startup_entry+0xcc/0x2a0
[ 198.525023] rest_init+0x90/0x9c
[ 198.530942] start_kernel+0x384/0x394
[ 198.536857] CPU3: stopping
[ 198.542657] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 3.16.85-65 #1
[ 198.548928] Call trace:
[ 198.554355] dump_backtrace+0x0/0xd8
[ 198.559745] show_stack+0x24/0x30
[ 198.565062] dump_stack+0x94/0xb8
[ 198.570303] handle_IPI+0x188/0x198
[ 198.575518] gic_handle_irq+0x84/0x88
[ 198.580580] el1_irq+0x64/0xd0
[ 198.585434] cpu_startup_entry+0xcc/0x2a0
[ 198.590089] secondary_start_kernel+0x118/0x128
[ 198.594702] CPU2: stopping
[ 198.599238] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 3.16.85-65 #1
[ 198.604378] Call trace:
[ 198.608864] dump_backtrace+0x0/0xd8
[ 198.613356] show_stack+0x24/0x30
[ 198.617800] dump_stack+0x94/0xb8
[ 198.622208] handle_IPI+0x188/0x198
[ 198.626577] gic_handle_irq+0x84/0x88
[ 198.630876] el1_lrq+0x64/0xd0
[ 198.635169] cpu_startup_entry+0xcc/0x2a0
[ 198.639343] secondary_start_kernel+0x118/0xl28
[ 198.643397] CPU1: stopping
[ 198.647343] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.16.85-65 #1
[ 198.651858] Call trace:
[ 198.655770] dump_backtrace+0x0/0xd8
[ 198.659676] show_stack+0x24/0x30
[ 198.663542] dump_stack+0x94/0xb8
[ 198.667250] handle_IPI+0x188/0x198
[ 198.670793] gic_handIe_irq+0x84/0x88
[ 198.674208] el1_irq+0x64/0xd0
[ 198,677582] cpu_startup_entry+0xcc/0x2a0
[ 198.660928] secondarัƒ_start_kernel+0x118/0x128
[ 198.684195] --- [ end Kernel panic - not syncing: BUG !
Attachments
odroid_c2_panic_20210414_0021.txt
(2.16 KiB) Downloaded 9 times
kp_20210414_002204.jpg
kp_20210414_002204.jpg (600.33 KiB) Viewed 555 times
odroid_c2_panic_20210326_0017.txt
(2.16 KiB) Downloaded 12 times
kp_20210326.jpg
kp_20210326.jpg (541.94 KiB) Viewed 555 times

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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by odroid »

Since we've not used VPN server software, it is hard to know what causes the kernel panic.

Let's try narrowing down root causes.
What happens if you use the latest minimal image (minimal-odroid-c2-20210201.img.xz) without installing LXDE?

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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by andnovator »

First of all, I forgot to attach dpkg -l result, here is (in the attachment file). Also another system info (not nessasary, but anyway):

Code: Select all

$ uname -a
Linux odroid 3.16.85-65 #1 SMP PREEMPT Mon Jan 18 13:32:38 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04.2 LTS
Release:        20.04
Codename:       focal
All last updates was installed, I used latest .img file to install Ubuntu.

>>dpkg -l

Hm, strange, I doesn't see libreswan installed, only strongswan. Looks like now by default as no libreswan or stromgswan was insalled, apt install libreswan (network-manager-l2tp has dependency: strongswan OR libreswan)
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pkg_20210414.txt
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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by andnovator »

>>without installing LXDE
[It was replaced by LXQT btw]

Yes, as I run with multiuser.target ("console only"), same result with "clean" install Ubuntu minimal from latest .img ile (only network-manager-l2tp with dependecies and few another packages, see new dpkg -l list)
Attachments
pk_minimal_20210414_2320.txt
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p_20210414_23_2.jpg
p_20210414_23_2.jpg (339.32 KiB) Viewed 520 times
p_20210414_23_1.jpg
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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by andnovator »

I tried using network-manager-l2tp with libreswan (insalling with apt, installing before network-manager-l2tp package) instead of strongswan - same result (kernel panic after few seconds after vpn disconnection)
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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by andnovator »

Hm, interesting. What I found. After few seconds after disconnecting/connecting from/to any connection with NetworkManager, "new" line is added to syslog:

Code: Select all

odroid systemd[1]: NetworkManager-dispatcher.service: Succeeded
And when kernel panic occurs, there is no same line in tail -f /var/log/syslog ...

Sooooo... maybe it's kernel panic when NetworkManager-dispatcher.service is running (after l2tp vpn disconnection)? ๐Ÿค”

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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by igorpec »

andnovator wrote: โ†‘
Thu Apr 15, 2021 6:07 am
Sooooo... maybe it's kernel panic when NetworkManager-dispatcher.service is running (after l2tp vpn disconnection)? ๐Ÿค”
Maybe you should move from dirty old stock kernel 3.16.y and "Ubuntu". It is highly possible, that your problems will just disappear. This chip is very well / almost fully supported in mainline kernel and you don't need to run horribly outdated software.
ARMBIAN
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What is Armbian?

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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by odroid »

I agree that some portion of the network driver in the old kernel might not be compatible with newer network manager.
Please try an Armbian OS image based on Kernel 5.10 if you don't need GPU/VPU HW acceleration nor GPIO things.
https://www.armbian.com/odroid-c2/

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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by andnovator »

igorpec wrote: โ†‘
Thu Apr 15, 2021 9:01 am
Maybe you should move from dirty old stock kernel 3.16.y
Hmmm, so it's real, that it's kernel version. Hm, @odroid, why there are so old kernel in Ubuntu image? Can I install last LTS linux kernel or any another newer linux kernel?

Btw, I saw some issues related to l2tp, when kernel version was a problem
Last edited by andnovator on Thu Apr 15, 2021 4:25 pm, edited 1 time in total.

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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by andnovator »

odroid wrote: โ†‘
Thu Apr 15, 2021 9:01 am
if you don't need GPU/VPU HW acceleration nor GPIO things.
Nope, I need both. Most importanly - write to GPIO + pwm

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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by odroid »

Because many users have used the GPU/VPU acceleration features vitally, we had to keep using the old stock kernel. There is no properly working GPU/VPU drivers in the mainline kernel.
If we ignored the major users' requirement, we could easily move to the upstream kernel as other 3rd party OS developers did.

BTW, have you tried Armbian image based on Kernel 5.10 to check l2tp/ipsec vpn server issue separately?

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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by andnovator »

Ok, I only want to know "example" reasons, why old kernel used. I understood that this is often used some kernel version with specific harware.

So my question - can I update kernel to some more newer version? With some knowed or "extreme" ways? =)

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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by odroid »

There is no simple way. If you clone Armbian kernel and boot loader source code via their github, you can probably build and make it bootable.
But, there must be a lot of time consuming debug process back and force if it doesn't boot well.
To make a quick test, freshly flash that image.

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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by andnovator »

I made additional multiple "tests".

Ubuntu 18.04 minimal (from ubuntu-18.04.3-3.16-minimal-odroid-c2-20190814.img), network-manager-l2tp from default repositories - same result, kernel panic after few seconds after disconneting.

Ubuntu 16.04 minimal (from ubuntu64-16.04.3-minimal-odroid-c2-20171005.img), network-manager-l2tp from PPA (ppa:nm-l2tp/network-manager-l2tp) [strange: installing from ppa also installed a lot of packages, I saw some xorg packages, multiple fonts packages, but no any big DE packages - still "console mode"] - NO KERNEL PANIC. Heh, old kernel - old Ubuntu =)

[btw, Ubuntu >=18.04 uses netplan...]

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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by igorpec »

andnovator wrote: โ†‘
Fri Apr 16, 2021 7:16 am
[btw, Ubuntu >=18.04 uses netplan...]
Forget about Ubuntu you are used on x86 ;) If you didn't download this image from www.ubuntu.com, its not Ubuntu. I assume that should be clear by now? Also Armbian provides Ubuntu based variant, but we only keep package relations and relation to release name (Focal, Bionic, Hirsute) - those things are important and relevant for software install, while the rest, network configuration, hardware specific tweaks, improvements, booting process .. are custom and unrelated to Ubuntu. https://docs.armbian.com/#what-is-the-d ... bianubuntu
ARMBIAN
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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by andnovator »

@igorpec, please do not write such promotional messages, I have understood enough @odroid messages.

I'll try Armbian whenever I want
Last edited by andnovator on Mon Apr 19, 2021 5:28 am, edited 1 time in total.

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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by andnovator »

Made some another test. On Ubuntu 20.04 (from Ubuntu 20 minimal image) I disabled NetworkManager, configured netplan. I connected to VPN with console commands based on https://github.com/hwdsl2/setup-ipsec-v ... mmand-line (made some modifications to commands). As I saw, pptd or xl2tpd is maybe cause of kernal panic: when disconnecting from VPN by xl2tpd (echo "d myvpn" | sudo tee /var/run/xl2tpd/l2tp-control) kernel panic occurs
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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by andnovator »

Ok, I'm wrong, it's more complicated.

I also tried once not running commands separatly, but run my custom scripts... And no kernel panic!! And when I ran only echo "d myvpn" | sudo tee /var/run/xl2tpd/l2tp-control and wait... kernel panic occurs.

BUT second time when I ran l2tp_down, kernel panic occurs. Interesting.

My custom scripts is in attachments
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l2tp_up.sh
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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by brad »

I'm going to take a small guess at potential fix you can try.

Edit your boot.ini (should be located /media/boot/boot.ini) and change the following setting to 'setenv mesontimer "0"'

Code: Select all

# Meson Timer
# 1 - Meson Timer
# 0 - Arch Timer 
# Using meson_timer improves the video playback however it breaks KVM (virtualization).
# Using arch timer allows KVM/Virtualization to work however you'll experience poor video
setenv mesontimer "1"
Reboot and retest

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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by andnovator »

@brad, setenv mesontimer "1" is set by default in the boot.ini. I even tried reverse, 0 - it has no effect.

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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by andnovator »

Ok, I tried to compile linux kernel from hardkernel github repository (odroidc2-v3.14.y branch) with guide from https://wiki.odroid.com/odroid-c2/softw ... d-c2ubuntu. As I use Ubuntu 20.04, I temporarily added xenial main and universal to apt source list to install gcc-4.9 and g++-4.9 (with dependecies). Then set update-alternatives to use gcc-4.9:

Code: Select all

sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.9 1
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-9 2
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.9 1
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-9 2
Then configure alternatives to gcc-4.9 (with update-alternatives --config).

And then made make and make install as mentonied in the guide above.

(After that, I compiled even older linux kernel - 3.14)

After reboot I tried ONCE to connect/disconnect from/to l2tp with my scripts and ONCE with commands manualy with waiting after echo "d myvpn" | sudo tee /var/run/xl2tpd/l2tp-control - there was no kernel panic!

I'll try to make more tests and compile linux kernel from odroidc2-v3.16.y branch.
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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by andnovator »

Ok, I made two tests. I compiled kernel 3.16 from source. So... There are kernel panic with Ubuntu 20.04 (and 18.04) on l2tp/ipsec disconnection (near pppol2tp_sesslon_destruct). With linux kernel 3.14 (tested with compiled from source) there are no kernel panic with l2tp/ipsec vpn connection/disconnection, on Ubuntu 20.04; both with nmcli and manual commands for ipsec and xl2tpd (and with my custom scripts).

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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by andnovator »

Btw, my compiled Image and meson64_odroidc2.dtb files of 3.14 kernel (compiled on ODROID-C2 on Ubuntu 20.04 with gcc-4.9)
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Re: Kernel panic on Ubuntu 20.04 after ~ 5 seconds after disconnecting from l2tp/ipsec vpn server by NetworkManager

Post by andnovator »

Tested with 5.1 kernel on armbian image - obviously, no kernel panic on l2tp/ipsec (tested with wifi). Buuut.. now last arambian image has "bug" with ethernet (not working) [decribed on armbian forum]

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