\Drupal\system\Tests\Menu\MenuRouterTest::doTestExoticPath uses a pretty exotic path,
but this causes a database exception:
[12-Oct-2015 13:03:48 Europe/Berlin] Drupal\Core\Database\DatabaseExceptionWrapper: SQLSTATE[HY000]: General error: 1366 Incorrect string value: '\xC3\xA9\xC3\xB8\xC3\xAF...' for column 'name' at row 1: INSERT INTO {semaphore} (name, value, expire) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2); Array
Given that this URL could be passed in by the user, this could be problematic.
Closed: works as designed
9.5
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
There is only one report of this problem, from 8 years ago. Hopefully, this has been resolved in the meantime. Steps to reproduce were asked for 10 months ago. Since that information is needed to investigate this I am closing this issue.
If you are experiencing this problem on a supported version of Drupal reopen the issue, by setting the status to 'Active', and provide complete steps to reproduce the issue → (starting from "Install Drupal core").