[Bug 1724722] gdb crashed with signal 7

[Apport retracing service]

StacktraceTop:
 read_uleb128_to_uint64 (r=<optimized out>, buf_end=<optimized out>, buf=<optimized out>) at ./gdb/../include/leb128.h:67
 gdb_read_uleb128 (r=<optimized out>, buf_end=<optimized out>, buf=<optimized out>) at ./gdb/dwarf2expr.h:287
 decode_frame_entry_1 (entry_type=EH_CIE_OR_FDE_TYPE_ID, fde_table=0xbfe8b684, cie_table=0xbfe8b67c, eh_frame_p=1, start=0xb6d71ff0 <error: Cannot access memory at address 0xb6d71ff0>, unit=0x14664f8) at ./gdb/dwarf2-frame.c:2150
 decode_frame_entry (unit=unit at entry=0x14664f8, start=0xb6d71ff0 <error: Cannot access memory at address 0xb6d71ff0>, eh_frame_p=eh_frame_p at entry=1, cie_table=0xbfe8b67c, fde_table=0xbfe8b684, entry_type=EH_CIE_OR_FDE_TYPE_ID) at ./gdb/dwarf2-frame.c:2185
 dwarf2_build_frame_info (objfile=<optimized out>) at ./gdb/dwarf2-frame.c:2341

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https://bugs.launchpad.net/bugs/1724722

Title:
  gdb crashed with signal 7

Status in gdb package in Ubuntu:
  New

Bug description:
  After closing out browser reporting Bug #1724718, this occurred
  immediately.

  ProblemType: Crash
  DistroRelease: Ubuntu 17.10
  Package: gdb 8.0.1-0ubuntu1
  ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic i686
  ApportVersion: 2.20.7-0ubuntu3
  Architecture: i386
  CasperVersion: 1.387
  Date: Wed Oct 18 21:56:19 2017
  ExecutablePath: /usr/bin/gdb
  LiveMediaBuild: Ubuntu-MATE 17.10 "Artful Aardvark" - Release i386 (20171017)
  ProcCmdline: /usr/bin/gdb --ex file\ "/bin/busybox" --ex core-file\ /tmp/apport_core_bz53e3_u --batch --ex set\ backtrace\ limit\ 2000 --ex p\ -99 --ex info\ registers --ex p\ -99 --ex x/16i\ $pc --ex p\ -99 --ex bt\ full --ex p\ -99 --ex thread\ apply\ all\ bt\ full --ex p\ -99 --ex print\ __abort_msg->msg --ex p\ -99 --ex print\ __glib_assert_msg --ex p\ -99 --ex print\ (char*)\ __nih_abort_msg
  ProcEnviron:
   SHELL=/bin/bash
   LANG=en_US.UTF-8
   PATH=(custom, no user)
  Signal: 7
  SourcePackage: gdb
  StacktraceTop:
   ?? ()
   ?? ()
   ?? ()
   ?? ()
   ?? ()
  Title: gdb crashed with signal 7
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

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