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10/20/25
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Comment on [#5108] session table deadlock with remote calendars
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> When row-level locking is disabled (using MyISAM tables, for example) > in Horde, it is possible to create a race/deadlock condition on the > session table when viewing a remote calendar that is hosted on your > server. > > > > To reproduce this problem, add your own calendar (such as > https://example.com/kronolith/ics.php?c=bob@example.com) as a remote > calendar in Kronolith's Options. Click on "Today" and then select > the remote calendar from the "Select calendars to display:" drop-down > list. > > > > At this point, two separate Apache processes will be holding a lock > on the session table, and any new pages requiring access to the > session table will hang.
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