Under some circumstances, the tree view can end up in an infinite loop, causing the page to generate a timeout.
The steps that lead to the error are not clear, here are some crumbs :
In \Drupal\views_tree\ViewsResultTreeValues::setTreeValues() if when we call $this->findRowByParent($result, $current_row->views_tree_parent); $result and $current_row->views_tree_parent have the same value, you'll end up in an infinite loop because we always enter in the if statement.
Two options i'd say:
1/ Add a condition to the while to limit the depth to the number if items in $result. We can't go deeper than that.
2/ Add a test to prevent an item for being it's own parent when the keys are normalized.
A third option could be to do both.
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Issue #3332345 by artusamak, duaelfr: Infinite loop issue
Automatically closed - issue fixed for 2 weeks with no activity.