Crash caused by libc detecting buffer overflow

While trying to understand issue in MB-4493 (caused by our unusual auth behavior, which could be client "bug" as well) I tried the following from irb and here's what I got:

>> Couchbase.new(:hostname => "localhost", :port => 9000, :bucket => "pwprotected", :username =>"Administrator", :password=>"asdasd")

• • • buffer overflow detected ***: irb terminated
      ======= Backtrace: =========
      /lib/i386-linux-gnu/i686/cmov/libc.so.6(__fortify_fail+0x50)[0xf7521f70]
      /lib/i386-linux-gnu/i686/cmov/libc.so.6(+0xe3eaa)[0xf7520eaa]
      /lib/i386-linux-gnu/i686/cmov/libc.so.6(__strcpy_chk+0x44)[0xf7520224]
      /usr/lib/libcouchbase.so.1(+0x59c1)[0xf6c1b9c1]
      ======= Memory map: ========
      08048000-08049000 r-xp 00000000 08:02 17341823 /usr/bin/ruby1.8
      08049000-0804a000 r--p 00000000 08:02 17341823 /usr/bin/ruby1.8
      0804a000-0804b000 rw-p 00001000 08:02 17341823 /usr/bin/ruby1.8
      08b9b000-08fbd000 rw-p 00000000 00:00 0 [heap]
      f6b79000-f6b95000 r-xp 00000000 08:02 17995831 /lib/i386-linux-gnu/libgcc_s.so.1
      f6b95000-f6b96000 rw-p 0001b000 08:02 17995831 /lib/i386-linux-gnu/libgcc_s.so.1
      f6b96000-f6bcb000 r--s 00000000 08:02 11171194 /var/cache/nscd/hosts
      f6bcb000-f6c11000 r-xp 00000000 08:02 17736136 /usr/lib/libevent-2.0.so.5.1.6
      f6c11000-f6c12000 rw-p 00046000 08:02 17736136 /usr/lib/libevent-2.0.so.5.1.6
      f6c12000-f6c14000 r-xp 00000000 08:02 17736875 /usr/lib/libcouchbase_libevent.so.1.0.0
      f6c14000-f6c15000 r--p 00001000 08:02 17736875 /usr/lib/libcouchbase_libevent.so.1.0.0
      f6c15000-f6c16000 rw-p 00002000 08:02 17736875 /usr/lib/libcouchbase_libevent.so.1.0.0
      f6c16000-f6c26000 r-xp 00000000 08:02 17736895 /usr/lib/libcouchbase.so.1.2.0
      f6c26000-f6c27000 r--p 0000f000 08:02 17736895 /usr/lib/libcouchbase.so.1.2.0
      f6c27000-f6c28000 rw-p 00010000 08:02 17736895 /usr/lib/libcouchbase.so.1.2.0
      f6c28000-f6c33000 r-xp 00000000 08:02 16171260 /var/lib/gems/1.8/gems/yajl-ruby-1.1.0/lib/yajl/yajl.so
      f6c33000-f6c34000 rw-p 0000a000 08:02 16171260 /var/lib/gems/1.8/gems/yajl-ruby-1.1.0/lib/yajl/yajl.so
      f6c34000-f6f52000 rw-p 00000000 00:00 0
      f6f52000-f7072000 r--p 001ee000 08:02 23382439 /usr/lib/locale/locale-archive
      f7072000-f7272000 r--p 00000000 08:02 23382439 /usr/lib/locale/locale-archive
      f7272000-f7311000 rw-p 00000000 00:00 0
      f7311000-f732e000 r-xp 00000000 08:02 17995776 /lib/i386-linux-gnu/libtinfo.so.5.9
      f732e000-f7330000 r--p 0001c000 08:02 17995776 /lib/i386-linux-gnu/libtinfo.so.5.9
      f7330000-f7331000 rw-p 0001e000 08:02 17995776 /lib/i386-linux-gnu/libtinfo.so.5.9
      f7331000-f7353000 r-xp 00000000 08:02 17995778 /lib/i386-linux-gnu/libncurses.so.5.9
      f7353000-f7354000 r--p 00021000 08:02 17995778 /lib/i386-linux-gnu/libncurses.so.5.9
      f7354000-f7355000 rw-p 00022000 08:02 17995778 /lib/i386-linux-gnu/libncurses.so.5.9
      f7355000-f7389000 r-xp 00000000 08:02 17992855 /lib/i386-linux-gnu/libreadline.so.5.2
      f7389000-f738d000 rw-p 00033000 08:02 17992855 /lib/i386-linux-gnu/libreadline.so.5.2
      f738d000-f738e000 rw-p 00000000 00:00 0
      f73b2000-f743d000 rw-p 00000000 00:00 0
      f743d000-f7593000 r-xp 00000000 08:02 17995820 /lib/i386-linux-gnu/i686/cmov/libc-2.13.so
      f7593000-f7594000 ---p 00156000 08:02 17995820 /lib/i386-linux-gnu/i686/cmov/libc-2.13.so
      f7594000-f7596000 r--p 00156000 08:02 17995820 /lib/i386-linux-gnu/i686/cmov/libc-2.13.so
      f7596000-f7597000 rw-p 00158000 08:02 17995820 /lib/i386-linux-gnu/i686/cmov/libc-2.13.so
      f7597000-f759a000 rw-p 00000000 00:00 0
      f759a000-f75be000 r-xp 00000000 08:02 17995814 /lib/i386-linux-gnu/i686/cmov/libm-2.13.so
      f75be000-f75bf000 r--p 00023000 08:02 17995814 /lib/i386-linux-gnu/i686/cmov/libm-2.13.so
      f75bf000-f75c0000 rw-p 00024000 08:02 17995814 /lib/i386-linux-gnu/i686/cmov/libm-2.13.so
      f75c0000-f75c9000 r-xp 00000000 08:02 17995801 /lib/i386-linux-gnu/i686/cmov/libcrypt-2.13.so
      f75c9000-f75ca000 r--p 00008000 08:02 17995801 /lib/i386-linux-gnu/i686/cmov/libcrypt-2.13.so
      f75ca000-f75cb000 rw-p 00009000 08:02 17995801 /lib/i386-linux-gnu/i686/cmov/libcrypt-2.13.so
      f75cb000-f75f2000 rw-p 00000000 00:00 0
      f75f2000-f75f4000 r-xp 00000000 08:02 17995803 /lib/i386-linux-gnu/i686/cmov/libdl-2.13.so
      f75f4000-f75f5000 r--p 00001000 08:02 17995803 /lib/i386-linux-gnu/i686/cmov/libdl-2.13.so
      f75f5000-f75f6000 rw-p 00002000 08:02 17995803 /lib/i386-linux-gnu/i686/cmov/libdl-2.13.so
      f75f6000-f75fd000 r-xp 00000000 08:02 17995828 /lib/i386-linux-gnu/i686/cmov/librt-2.13.so
      f75fd000-f75fe000 r--p 00006000 08:02 17995828 /lib/i386-linux-gnu/i686/cmov/librt-2.13.so
      f75fe000-f75ff000 rw-p 00007000 08:02 17995828 /lib/i386-linux-gnu/i686/cmov/librt-2.13.so
      f75ff000-f7600000 rw-p 00000000 00:00 0
      f7600000-f7615000 r-xp 00000000 08:02 17995797 /lib/i386-linux-gnu/i686/cmov/libpthread-2.13.so
      f7615000-f7616000 r--p 00014000 08:02 17995797 /lib/i386-linux-gnu/i686/cmov/libpthread-2.13.so
      f7616000-f7617000 rw-p 00015000 08:02 17995797 /lib/i386-linux-gnu/i686/cmov/libpthread-2.13.so
      f7617000-f7619000 rw-p 00000000 00:00 0
      f7619000-f7703000 r-xp 00000000 08:02 17736598 /usr/lib/libruby1.8.so.1.8.7
      f7703000-f7706000 rw-p 000e9000 08:02 17736598 /usr/lib/libruby1.8.so.1.8.7
      f7706000-f7716000 rw-p 00000000 00:00 0
      f7717000-f771e000 r-xp 00000000 08:02 17736748 /usr/lib/libvbucket.so.1.1.0
      f771e000-f771f000 r--p 00006000 08:02 17736748 /usr/lib/libvbucket.so.1.1.0
      f771f000-f7720000 rw-p 00007000 08:02 17736748 /usr/lib/libvbucket.so.1.1.0Aborted