Might be worth taking a stroll through the archives; Glenn Herbert wrote on the
mechanisms used when files are reshaping themselves (which might include
extending into overflow, creating an oversized record, or dynamic file
split/merge activity. Each of these takes a latch on the file header ("group
#0") and is the principal cause of a self-deadlatch situation. Another
possible cause is an attempt to promote lock strength (for example a file lock
from intent to exclusive) when another user holds a shared record lock.
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