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[Hadmut Danisch <hadmut@xxxxxxxxxx>]

More analysis:

ifstate crashes if /run/network/ifstate is not present.

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https://bugs.launchpad.net/bugs/1535648

Title:
  ifquery crashing

Status in ifupdown package in Ubuntu:
  New

Bug description:
  Hi,

  I'm just doing some tests where to use an ubuntu machine as a router
  and thus plugging in an USB Ethernet devices as it's second ethernet
  interfaces.

  Unfortunately I can't keep that damned Network manager from renaming
  the device (i.e. from eth0 to  enx0000e80006d8), even if I tell NM to
  ignore the device. Since this happens before udev, it confuses several
  udev scripts).

  In context of this problem I found lots of messages in /var/log/syslog
  of the kind

  Jan 19 11:27:22 pcdanisch kernel: [   58.468781] ifquery[2851]: segfault at 1 ip 0000000000403187 sp 00007ffd578ec7e0 error 4 in ifup[400000+d000]
  Jan 19 11:27:22 pcdanisch sh[799]: Segmentation fault (core dumped)
  Jan 19 11:27:23 pcdanisch kernel: [   59.827088] ifquery[2854]: segfault at 1 ip 0000000000403187 sp 00007fffc05179f0 error 4 in ifup[400000+d000]
  Jan 19 11:27:30 pcdanisch kernel: [   67.250139] ifquery[2869]: segfault at 1 ip 0000000000403187 sp 00007ffd35611ce0 error 4 in ifup[400000+d000]
  Jan 19 11:27:32 pcdanisch kernel: [   68.602021] ifquery[2872]: segfault at 1 ip 0000000000403187 sp 00007ffcf72b86d0 error 4 in ifup[400000+d000]
  Jan 19 11:27:34 pcdanisch kernel: [   70.959531] ifquery[2877]: segfault at 1 ip 0000000000403187 sp 00007fffde45f440 error 4 in ifup[400000+d000]
  Jan 19 11:27:35 pcdanisch kernel: [   72.308751] ifquery[2880]: segfault at 1 ip 0000000000403187 sp 00007ffe5b504290 error 4 in ifup[400000+d000]
  Jan 19 11:27:38 pcdanisch kernel: [   74.665195] ifquery[2885]: segfault at 1 ip 0000000000403187 sp 00007ffc740490d0 error 4 in ifup[400000+d000]
  Jan 19 11:27:41 pcdanisch kernel: [   78.025873] ifquery[2892]: segfault at 1 ip 0000000000403187 sp 00007ffe07b6dbc0 error 4 in ifup[400000+d000]
  Jan 19 11:27:42 pcdanisch kernel: [   79.373347] ifquery[2896]: segfault at 1 ip 0000000000403187 sp 00007ffe48bf52c0 error 4 in ifup[400000+d000]
  Jan 19 11:27:45 pcdanisch kernel: [   81.735654] ifquery[2901]: segfault at 1 ip 0000000000403187 sp 00007ffdae631d10 error 4 in ifup[400000+d000]
  Jan 19 11:27:46 pcdanisch kernel: [   83.096254] ifquery[2904]: segfault at 1 ip 0000000000403187 sp 00007fff1832ff20 error 4 in ifup[400000+d000]
  Jan 19 11:27:48 pcdanisch kernel: [   84.464102] ifquery[2907]: segfault at 1 ip 0000000000403187 sp 00007fff187e0190 error 4 in ifup[400000+d000]
  Jan 19 11:27:51 pcdanisch kernel: [   87.846187] ifquery[2926]: segfault at 1 ip 0000000000403187 sp 00007ffdda95e5a0 error 4 in ifup[400000+d000]
  Jan 19 11:27:53 pcdanisch kernel: [   90.221171] ifquery[2943]: segfault at 1 ip 0000000000403187 sp 00007ffc74040e80 error 4 in ifup[400000+d000]
  Jan 19 11:27:55 pcdanisch kernel: [   91.585842] ifquery[2946]: segfault at 1 ip 0000000000403187 sp 00007ffe9e5690a0 error 4 in ifup[400000+d000]
  Jan 19 11:27:56 pcdanisch kernel: [   92.944679] ifquery[2949]: segfault at 1 ip 0000000000403187 sp 00007ffe87e171c0 error 4 in ifup[400000+d000]
  Jan 19 11:27:57 pcdanisch kernel: [   94.311727] ifquery[2952]: segfault at 1 ip 0000000000403187 sp 00007ffc6e785e50 error 4 in ifup[400000+d000]
  Jan 19 11:28:00 pcdanisch kernel: [   96.675499] ifquery[2957]: segfault at 1 ip 0000000000403187 sp 00007fff554d8c50 error 4 in ifup[400000+d000]
  Jan 19 11:28:02 pcdanisch kernel: [   99.054338] ifquery[2962]: segfault at 1 ip 0000000000403187 sp 00007ffe86f84f10 error 4 in ifup[400000+d000]
  Jan 19 11:28:03 pcdanisch kernel: [  100.421026] ifquery[2965]: segfault at 1 ip 0000000000403187 sp 00007ffc207b43e0 error 4 in ifup[400000+d000]
  Jan 19 11:28:06 pcdanisch kernel: [  102.797828] ifquery[2970]: segfault at 1 ip 0000000000403187 sp 00007ffeadf03670 error 4 in ifup[400000+d000]
  Jan 19 11:28:10 pcdanisch kernel: [  107.196645] ifquery[2979]: segfault at 1 ip 0000000000403187 sp 00007ffecb784e70 error 4 in ifup[400000+d000]
  Jan 19 11:28:12 pcdanisch kernel: [  108.559839] ifquery[2982]: segfault at 1 ip 0000000000403187 sp 00007ffd583c4260 error 4 in ifup[400000+d000]
  Jan 19 11:28:14 pcdanisch kernel: [  110.923263] ifquery[2987]: segfault at 1 ip 0000000000403187 sp 00007ffc9a42fcb0 error 4 in ifup[400000+d000]
  Jan 19 11:28:15 pcdanisch kernel: [  112.290839] ifquery[2990]: segfault at 1 ip 0000000000403187 sp 00007ffd42fb2960 error 4 in ifup[400000+d000]
  Jan 19 11:28:17 pcdanisch kernel: [  113.663268] ifquery[2993]: segfault at 1 ip 0000000000403187 sp 00007ffec52573c0 error 4 in ifup[400000+d000]
  Jan 19 11:28:19 pcdanisch kernel: [  116.039414] ifquery[2998]: segfault at 1 ip 0000000000403187 sp 00007ffc89c7a6a0 error 4 in ifup[400000+d000]
  Jan 19 11:28:20 pcdanisch kernel: [  117.410062] ifquery[3001]: segfault at 1 ip 0000000000403187 sp 00007ffc73a40f90 error 4 in ifup[400000+d000]
  Jan 19 11:28:22 pcdanisch kernel: [  118.778371] ifquery[3004]: segfault at 1 ip 0000000000403187 sp 00007fff27fa05e0 error 4 in ifup[400000+d000]
  Jan 19 11:28:24 pcdanisch kernel: [  121.154538] ifquery[3009]: segfault at 1 ip 0000000000403187 sp 00007fff61c73220 error 4 in ifup[400000+d000]
  Jan 19 11:28:27 pcdanisch kernel: [  123.527011] ifquery[3014]: segfault at 1 ip 0000000000403187 sp 00007ffcd6a8dc80 error 4 in ifup[400000+d000]
  Jan 19 11:28:28 pcdanisch kernel: [  124.892613] ifquery[3017]: segfault at 1 ip 0000000000403187 sp 00007fffba57fa20 error 4 in ifup[400000+d000]
  Jan 19 11:28:28 pcdanisch sh[799]: message repeated 31 times: [ Segmentation fault (core dumped)]

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: ifupdown 0.7.54ubuntu1
  ProcVersionSignature: Ubuntu 4.2.0-23.28-generic 4.2.6
  Uname: Linux 4.2.0-23-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  Date: Tue Jan 19 11:30:48 2016
  InstallationDate: Installed on 2015-09-03 (137 days ago)
  InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150825)
  SourcePackage: ifupdown
  UpgradeStatus: No upgrade log present (probably fresh install)

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