netdev - Fw: [Bug 111771] New: deadlock in ppp/l2tp

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Message-ID: <20160203110431.7b878a4f@samsung9>
Date:	Wed, 3 Feb 2016 11:04:31 +1100
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	netdev@...r.kernel.org
Subject: Fw: [Bug 111771] New: deadlock in ppp/l2tp

Please excuse URL mangling, my bugzilla address appears to route through
stupid corporate firewall.

Begin forwarded message:

Date: Tue, 2 Feb 2016 18:38:41 +0000
From: "bugzilla-daemon@...zilla.kernel.org" <bugzilla-daemon@...zilla.kernel.org>
To: "shemminger@...ux-foundation.org" <shemminger@...ux-foundation.org>
Subject: [Bug 111771] New: deadlock in ppp/l2tp


https://urldefense.proofpoint.com/v2/url?u=https-3A__bugzilla.kernel.org_show-5Fbug.cgi-3Fid-3D111771&d=CwICaQ&c=IL_XqQWOjubgfqINi2jTzg&r=q_lvUiVm1uM6QEw9TPH-6jiV__hsrE6xXUAtATPE9x0&m=QRVzJYt9nD-EOW0XdrPpw2-kYmZu0sg62aaPeiiLI_Q&s=l3HC8fgAgyPVwSgMaX2Hjr8GL3P5j2fL1kDXhEW-v9w&e= 

            Bug ID: 111771
           Summary: deadlock in ppp/l2tp
           Product: Networking
           Version: 2.5
    Kernel Version: 4.3.2
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
          Assignee: shemminger@...ux-foundation.org
          Reporter: sorinm@...il.com
        Regression: No

Created attachment 202771
  --> https://urldefense.proofpoint.com/v2/url?u=https-3A__bugzilla.kernel.org_attachment.cgi-3Fid-3D202771-26action-3Dedit&d=CwICaQ&c=IL_XqQWOjubgfqINi2jTzg&r=q_lvUiVm1uM6QEw9TPH-6jiV__hsrE6xXUAtATPE9x0&m=QRVzJYt9nD-EOW0XdrPpw2-kYmZu0sg62aaPeiiLI_Q&s=2a_KCXgtoQ6NLxDon6_3flSUMpb7Tjj8WhGPZ09E8Vo&e= 
kernel.log, config, cpuinfo

I'm getting a deadlock and the computer is unresponsive shortly after setting
up a xl2tpd/ipsec vpn connection. The deadlock occurs every time, it is very
reproducible on my computer.

It is the mainline kernel, version 4.3.2.

The processor is given in a copy /proc/cpuinfo that I've attached.

uname:
Linux version 4.3.2 (gcc version 5.3.1 20160121 (Debian 5.3.1-7) ) #5 SMP
PREEMPT Sat Jan 30 00:05:40 CET 2016

ppp is from the debian package of their unstable distribution:
ppp_2.4.7-1+2_amd64

I've attached the kernel config file and the kernel log.

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