[Bug 926186]

[Apport retracing service]

Stacktrace:
 #0  main (argc=<optimized out>, argv=0x7fffedbc2cb8) at btrfstune.c:120
         root = 0x0
         seeding_flag = 0
         seeding_value = <optimized out>
         ret = <optimized out>
StacktraceTop: main (argc=<optimized out>, argv=0x7fffedbc2cb8) at btrfstune.c:120

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https://bugs.launchpad.net/bugs/926186

Title:
  btrfstune crashed with SIGSEGV in main()

Status in “btrfs-tools” package in Ubuntu:
  New

Bug description:
  Occurred when I attempted to run 'sudo btrfstune' on the umounted
  btrfs filesystem device.  I can mount and access the filesystem just
  fine.

  ProblemType: Crash
  DistroRelease: Ubuntu 12.04
  Package: btrfs-tools 0.19+20100601-3ubuntu3
  ProcVersionSignature: Ubuntu 3.2.0-12.20-generic 3.2.2
  Uname: Linux 3.2.0-12-generic x86_64
  ApportVersion: 1.91-0ubuntu1
  Architecture: amd64
  Date: Fri Feb  3 10:40:33 2012
  ExecutablePath: /sbin/btrfstune
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110705.1)
  ProcCmdline: btrfstune /dev/sda3
  ProcEnviron:
   SHELL=/bin/bash
   PATH=(custom, user)
   LANG=en_US.UTF-8
  SegvAnalysis:
   Segfault happened at: 0x40141d:	mov    0x110(%r12),%rax
   PC (0x0040141d) ok
   source "0x110(%r12)" (0x00000110) not located in a known VMA region (needed readable region)!
   destination "%rax" ok
  SegvReason: reading NULL VMA
  Signal: 11
  SourcePackage: btrfs-tools
  StacktraceTop:
   ?? ()
   __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
   ?? ()
   ?? ()
   ?? ()
  Title: btrfstune crashed with SIGSEGV in __libc_start_main()
  UpgradeStatus: Upgraded to precise on 2011-12-23 (41 days ago)
  UserGroups: adm admin cdrom dialout libvirtd lpadmin plugdev sambashare vboxusers

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