[Bug 988045]

[Apport retracing service]

StacktraceTop:
 internal_malloc (n=36, file=0x0, line=0, flags=<optimized out>) at /usr/include/bits/string3.h:85
 xmalloc (bytes=36) at ../bash/xmalloc.c:112
 _rl_mvcxt_alloc (op=2, key=99) at ../../../bash/lib/readline/vi_mode.c:1009
 rl_vi_change_to (count=<optimized out>, key=99) at ../../../bash/lib/readline/vi_mode.c:1310
 _rl_dispatch_subseq (key=99, map=0x6e68c0, got_subseq=0) at ../../../bash/lib/readline/readline.c:774

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https://bugs.launchpad.net/bugs/988045

Title:
  bash crashed with SIGSEGV in internal_malloc()

Status in “bash” package in Ubuntu:
  New

Bug description:
  I was typing on the command line and backspacing and BOOM the shell (and enclosing rxvt) went away.
  I can't ever remember crashing bash before.
  I had noticed yesterday that this interactive bash had managed to use up way more cpu (over 30 minutes!) than my other two dozen bash shells in various windows:

  bash                DX idallen  pts/3    1097.12 secs Tue Apr 17 01:52

  The nearest bash in CPU use was 6 *seconds* of CPU.  What is with this
  one?

  I've also had Firefox crashes, so I'm not above believing that I have
  either memory issues (but memtest says I don't) or SSD issues (OCZ
  Vertex 2).

  ProblemType: Crash
  DistroRelease: Ubuntu 11.04
  Package: bash 4.2-0ubuntu3
  ProcVersionSignature: Ubuntu 2.6.38-13.57-generic 2.6.38.8
  Uname: Linux 2.6.38-13-generic x86_64
  Architecture: amd64
  Date: Tue Apr 24 17:26:16 2012
  ExecutablePath: /bin/bash
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  ProcCmdline: -bash
  SegvAnalysis:
   Segfault happened at: 0x4a9d6b:	callq  0x41ae20 <memset at plt>
   PC (0x004a9d6b) ok
   source "0x41ae20" (0x0041ae20) ok
   destination "(%rsp)" (0x7fff9e2cbf70) not located in a known VMA region (needed writable region)!
   Stack memory exhausted (SP below stack segment)
  SegvReason: writing unknown VMA
  Signal: 11
  SourcePackage: bash
  StacktraceTop:
   ?? ()
   xmalloc ()
   ?? ()
   rl_vi_change_to ()
   _rl_dispatch_subseq ()
  Title: bash crashed with SIGSEGV in xmalloc()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm admin cdrom dialout disk lpadmin plugdev sambashare video

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