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[Pali <pali.rohar@xxxxxxxxx>]

100% reproducable everytime when interface (ipv6 using dhcpv6) goes
down. Same backtrace in gdb. Tested on ubuntu precise.

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https://bugs.launchpad.net/bugs/1069543

Title:
  ntpd crashes when network interface goes down

Status in ntp package in Ubuntu:
  Confirmed

Bug description:
  ntpd crashes with SIGSEGV when (teredo IPv6) interface goes down after
  unplugging a network cable:

  Oct 22 03:17:03 oil ntpdate[5896]: adjust time server 118.143.17.82 offset 0.005534 sec
  Oct 22 03:17:03 oil ntpd[5951]: ntpd 4.2.6p3@1.2290-o Mon Aug 20 15:15:21 UTC 2012 (1)
  Oct 22 03:17:03 oil ntpd[5952]: proto: precision = 0.106 usec
  Oct 22 03:17:03 oil ntpd[5952]: ntp_io: estimated max descriptors: 2144, initial socket boundary: 16
  Oct 22 03:17:03 oil ntpd[5952]: Listen and drop on 0 v4wildcard 0.0.0.0 UDP 123
  Oct 22 03:17:03 oil ntpd[5952]: Listen and drop on 1 v6wildcard :: UDP 123
  Oct 22 03:17:03 oil ntpd[5952]: Listen normally on 2 lo 127.0.0.1 UDP 123
  Oct 22 03:17:03 oil ntpd[5952]: Listen normally on 3 eth0 192.168.0.2 UDP 123
  Oct 22 03:17:03 oil ntpd[5952]: Listen normally on 4 teredo fe80::ffff:ffff:ffff UDP 123
  Oct 22 03:17:03 oil ntpd[5952]: Listen normally on 5 eth0 fe80::16fe:b5ff:fea4:b39f UDP 123
  Oct 22 03:17:03 oil ntpd[5952]: Listen normally on 6 teredo 2001:0:53aa:64c:875:7e15:90bc:9593 UDP 123
  Oct 22 03:17:03 oil ntpd[5952]: Listen normally on 7 lo ::1 UDP 123
  Oct 22 03:17:03 oil ntpd[5952]: peers refreshed
  Oct 22 03:17:03 oil ntpd[5952]: Listening on routing socket on fd #24 for interface updates
  Oct 22 03:24:45 oil ntpd[5952]: Deleting interface #5 eth0, fe80::16fe:b5ff:fea4:b39f#123, interface stats: received=0, sent=0, dropped=0, active_time=460 secs
  Oct 22 03:24:45 oil ntpd[5952]: Deleting interface #3 eth0, 192.168.0.2#123, interface stats: received=40, sent=41, dropped=0, active_time=460 secs
  Oct 22 03:24:45 oil ntpd[5952]: 220.130.158.71 interface 192.168.0.2 -> (none)
  Oct 22 03:24:45 oil ntpd[5952]: 118.143.17.82 interface 192.168.0.2 -> (none)
  Oct 22 03:24:45 oil ntpd[5952]: 14.0.18.136 interface 192.168.0.2 -> (none)
  Oct 22 03:24:45 oil ntpd[5952]: 54.251.61.122 interface 192.168.0.2 -> (none)
  Oct 22 03:24:45 oil ntpd[5952]: 203.176.128.10 interface 192.168.0.2 -> (none)
  Oct 22 03:24:45 oil ntpd[5952]: peers refreshed
  Oct 22 03:25:02 oil ntpd[5952]: Deleting interface #6 teredo, 2001:0:53aa:64c:875:7e15:90bc:9593#123, interface stats: received=0, sent=0, dropped=0, active_time=477 secs
  Oct 22 03:25:02 oil kernel: [197600.300333] ntpd[5952]: segfault at 8 ip 00007fda05b58321 sp 00007fff380bd540 error 4 in ntpd[7fda05b3b000+96000]

  Here is a gdb output:

  (gdb) c
  Continuing.

  Program received signal SIGSEGV, Segmentation fault.
  0x00007f743f09e321 in remove_interface (ep=0x7f74411771b0) at ntp_io.c:1098
  1098	ntp_io.c: No such file or directory.
  (gdb) bt
  #0  0x00007f743f09e321 in remove_interface (ep=0x7f74411771b0) at ntp_io.c:1098
  #1  update_interfaces (port=port@entry=123, receiver=receiver@entry=0x0, 
      data=data@entry=0x0) at ntp_io.c:2010
  #2  0x00007f743f09fb34 in interface_update (receiver=receiver@entry=0x0, 
      data=data@entry=0x0) at ntp_io.c:1617
  #3  0x00007f743f0c1215 in timer () at ntp_timer.c:394
  #4  0x00007f743f0a489b in ntpdmain (argc=<optimized out>, argv=<optimized out>)
      at ntpd.c:1127
  #5  0x00007f743f0954a9 in main (argc=<optimized out>, argv=<optimized out>)
      at ntpd.c:358
  (gdb) 

  I can only reproduce this with the teredo interface. If I disable it
  (by running "service miredo stop" before testing) I can not re-produce
  the problem any more.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: ntp 1:4.2.6.p3+dfsg-1ubuntu5
  ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
  Uname: Linux 3.5.0-17-generic x86_64
  ApportVersion: 2.6.1-0ubuntu4
  Architecture: amd64
  Date: Mon Oct 22 03:42:12 2012
  InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110920.2)
  KernLog:
   
  MarkForUpload: True
  SourcePackage: ntp
  UpgradeStatus: Upgraded to quantal on 2012-10-19 (2 days ago)
  modified.conffile..etc.ntp.conf: [modified]
  mtime.conffile..etc.ntp.conf: 2012-09-02T19:37:38.651830

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