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Bug#822801: xl2tpd makes kernel soft lockup



Control: severity -1 important
Control: found -1 4.5.1-1
Control: tag -1 moreinfo

On Thu, 28 Apr 2016 01:17:46 +0800 Lu Wang <wanglustar@hotmail.com> wrote:
> Package: xl2tpd
> Version: 1.3.6+dfsg-4
> Severity: critical
> Justification: breaks the whole system
> 
> Dear Maintainer,
> 
> I want to set a client of the l2tp vpn for my campus using this technique to connect to the internet.
> I have set the client for Debian 7. But now, when I try to do the same thing for a computer with Debian 9, I failed.
> I set use the configuration for the Debian 7 mechine, including /etc/xl2tpd/xl2tpd /etc/ppp/chap-secrets and /etc/ppp/options.xl2tpd.zju.
> The first one is the configuration for xl2tp, and the last two are for the ppp.
> 
> 
> Following is what I do.
> I find the xl2tpd is running after the initialization through lots of init-scripts. Then I use "echo 'c ZJU_VPN' > /var/run/xl2tpd/l2tp-control" to connect the vpn server in my campus. At the beginning everything is fine, I use "ip link" and I find that there is ppp0. But few time later, about 20-30 seconds I am not sure, the keybroad is useless. I can type nothing. And I find there are some words on the screen.
> NMI watchdog: BUG: soft lockup CPU#0 stuck for 23s ... And the mechine begins to beep.

Does this problem still occur when using Linux 4.7 (currently in
unstable)?

Ben.

-- 
Ben Hutchings
No political challenge can be met by shopping. - George Monbiot

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