Error “Second exclusive request on same page”

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Symptom
The MaxDB database shuts down with an emergency shutdown. The log file “knldiag” or “KnlMsg” contains the following entries:
ERR 53133 DATACACH Second exclusive request on same page
ERR 53133 DATACACH PAGENO:
ERR 53133 DATACACH CBLOCKPTR:
ERR 53000 B*TREE 07… (16 bytes)
ERR 53000 B*TREE Index Root
ERR 3 [...]