Themes disabled on cron

What exactly do you lose? Theme settings? The enabled themes?

Suppose duplicate of #305653: Themes disabled during update

That's what I thought, but I just wanted to check. We should get it fixed very soon!

I've reopen this bug because this problem not only on update.php #305653: Themes disabled during update

My env:

drupal 6.6
psql (PostgreSQL) 8.1.9
php 5.2.6

there are 3 sites (multisiting)
2 of them has different domains and sits sites/name1.domain/ and sites/name2.domain/
third site is /sub/sites/name2.domain.sub/

all of them has a different DBs but only 3rd site "randomly" (no update no cron) loose theme (row with custom theme just removes from table{system})

Once I visit mysite/sub/admin theme returns

Modules

Drupal 6.6
: Block, Database logging, Filter, Help, Locale, Menu, Node, PHP filter, Search, System, Taxonomy, Update status, Upload, User

FCKeditor - WYSIWYG HTML editor 6.x-1.3-rc5

Image 6.x-1.0-alpha3
: Image

Meta tags 6.x-1.0-rc1
: Meta tags

Taxonomy Menu 6.x-1.01
: Taxonomy Menu

Webform 6.x-2.3
: Webform

After some investigation I found only few occurrences of system_theme_data
One of them update_get_projects which clears its cache every hour and then reread all projects and themes

function update_get_projects() {
  static $projects = array();
  if (empty($projects)) {
    // Retrieve the projects from cache, if present.
    $projects = update_project_cache('update_project_projects');
    if (empty($projects)) {
      // Still empty, so we have to rebuild the cache.
      _update_process_info_list($projects, module_rebuild_cache(), 'module');
      _update_process_info_list($projects, system_theme_data(), 'theme'); /////////// rebuild all themes 
      // Set the projects array into the cache table.
      cache_set('update_project_projects', $projects, 'cache_update', time() + 3600); ///// every hour - very expensive
    }
  }
  return $projects;
}

function system_theme_data() {
  // Scan the installation theme .info files and their engines.
  $themes = _system_theme_data();

  // Extract current files from database.
  system_get_files_database($themes, 'theme');

  db_query("DELETE FROM {system} WHERE type = 'theme'");

  foreach ($themes as $theme) {
    if (!isset($theme->owner)) {
      $theme->owner = '';
    }

    db_query("INSERT INTO {system} (name, owner, info, type, filename, status, throttle, bootstrap) VALUES ('%s', '%s', '%s', '%s', '%s', %d, %d, %d)", $theme->name, $theme->owner, serialize($theme->info), 'theme', $theme->filename, isset($theme->status) ? $theme->status : 0, 0, 0);
  }

  return $themes;
}

Suppose if retrieving updates take a long time this loop can be interrupted and not all data writes to DB. I think better to change DELETE-INSERT_loop to UPDATE-DELETE

I have the same problem of radomly losing custom theme. What I did notice is that if update.php is run, it appears the next time cron runs it disables the custom theme, but not the core theme.

@spopovits This issue about update_status and cron

About update.php please review #305653: Themes disabled during update

I have checked that post and all the forums. this issue queue is closer to what I am seeing. I understand the update function problem and compensate for it, however periodically the non-core theme gets disabled which breaks the site, until I reenable it. There is something else other than the update.php that is disabling the theme.

FYI, the update.php bug is fixed as of Drupal 6.7/6.8. #305653: Themes disabled during update

And, I've run cron.php many times with update module enable and not experienced this bug. So, its not that module per se. The bug might only be present under some specific configurations.

Those of you who are still experiencing this bug on Drupal 6.8, can you do some more testing to try to narrow down what modules/configurations are causing this?

@andypost, if you think its that line in update module, can 1.) you verify you still have the problem with Drupal 6.8 and then 2.) check if the problem is fixed if you change that line to _update_process_info_list($projects, _system_theme_data(), 'theme');?

After update to 6.8 everything fine...