nautilus quits when deleting a folder in the left side treeview

Thank you taking the time to report this bug and helping to make Ubuntu better. However, processing the crash report to get detailed information for the developers failed as the retracer did not generate a useful symbolic stack trace.
Please try to obtain a backtrace manually following the instructions at http://wiki.ubuntu.com/DebuggingProgramCrash and upload the backtrace (as an attachment) to the bug report. This will greatly help us in tracking down your problem.

nautilus assert failure: *** glibc detected *** nautilus: free(): invalid pointer: 0x0a07b5d0 ***, here.

we still need the backtrace.

Confirmed, it happens in treeview mode when trying to delete a directory

Thank you for your bug report. This bug has been reported to the developers of the software. You can track it and make comments at:
https://bugzilla.gnome.org/show_bug.cgi?id=660906

double free occurs in
src/nautilus-tree-sidebar.c: 1015

static void
fm_tree_view_trash_cb (GtkWidget *menu_item,
           FMTreeView *view)
{
  GList *list;

  if (!nautilus_file_can_trash (view->details->popup_file)) {
    return;
  }

  list = g_list_prepend (NULL,
             nautilus_file_get_location (view->details->popup_file));

  nautilus_file_operations_trash_or_delete (list,
              fm_tree_view_get_containing_window (view),
              NULL, NULL);
  g_list_free_full (list, g_free);
}

The final call to g_list_free_full (list, g_free) causes the problem. Just for more informations sake, using g_object_unref instead of gfree avoids the crash, as does not calling g_list_free_full at all and so not double freeing. But someone with actual gobject memory management knowledge will need to look for the real problem, personally I thought g_free was supposed to handle this safely.

the issue got fixed upstream in
http://git.gnome.org/browse/nautilus/commit/?id=03888c1dde59cb2dd3b243e3c72f35757a4c2e5f

Hello shaheem, or anyone else affected,

Accepted nautilus into oneiric-proposed, the package will build now and be available in a few hours. Please test and give feedback here. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you in advance!

The proposed version resolves this bug.
I can delete folders from the tree view.

This bug was fixed in the package nautilus - 1:3.2.1-0ubuntu1

---------------
nautilus (1:3.2.1-0ubuntu1) oneiric-proposed; urgency=low

  * New upstream release:
    - Consolidate typeahead find entry for icon view (LP: #857710)
    - Fix a crasher when middle-clicking empty space in the places sidebar
    - Fix a crasher when trying to delete files from the tree sidebar
      (LP: #830185, #845408)
    - Fix a crasher when ejecting a removable device under some circumstances
    - Fix a crasher when trying to activate the previewer in a list view
      with no selection
    - Fix a crasher when symbolic icon theme is not available
    - Plug some memory leaks
    - Fix the build when Tracker FTS is enabled
  * Remove some cherry-picked patches:
    - git_handle_missing_icon.patch, git_gsettings_signals.patch,
      git_no_typeahead_timeout_segfault.patch,
      git_dont_preview_empty_selection.patch, git_correct_signal_handling.patch
      git_no_signal_order_assert.patch, git_slot_closing.patch,
      git_close_pane_cleaning.patch
 -- Didier Roche <email address hidden> Tue, 18 Oct 2011 09:52:20 +0200