Module uninstall fails , as hook_uninstall still uses drupal 6 syntax of db_fetch_object() which was deprecated in Drupal 7.
Error as follows
Fatal error: Call to undefined function db_fetch_object() in /www/drupal/sites/all/modules/session_expire/session_expire.install on line 20
Call Stack
# Time Memory Function Location
1 0.0000 260352 {main}( ) .../index.php:0
2 0.0958 6366520 menu_execute_active_handler( ) .../index.php:21
3 0.0959 6368232 call_user_func_array:{/www/drupal/includes/menu.inc:519} ( ) .../menu.inc:519
4 0.0959 6368608 drupal_get_form( ) .../menu.inc:519
5 0.0959 6369528 drupal_build_form( ) .../form.inc:130
6 0.0968 6391616 drupal_process_form( ) .../form.inc:385
7 0.0989 6542472 form_execute_handlers( ) .../form.inc:903
8 0.0989 6546216 system_modules_uninstall_submit( ) .../form.inc:1513
9 0.0989 6546808 drupal_uninstall_modules( ) .../system.admin.inc:1376
10 0.6152 8562272 module_invoke( ) .../install.inc:808
11 0.6152 8562632 call_user_func_array:{/www/drupal/includes/module.inc:866} ( ) .../module.inc:866
12 0.6152 8562872 session_expire_uninstall( ) .../module.inc:866
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