KITFORMA · EDITORIAL ANSWER
Why is a shared Go map unsafe even with only occasional writes?
KitForma editorial guide. An infrequent write can still overlap a read. Ordinary maps do not make that overlap safe because most traffic happens to be read-only.
Step-by-step answer
An infrequent write can still overlap a read. Ordinary maps do not make that overlap safe because most traffic happens to be read-only.
Guard the full access pattern with an appropriate mutex, transfer ownership through channels, or choose a suitable concurrent structure. Protect multi-step invariants together rather than locking each operation while allowing the overall decision to race. Avoid copying the owner’s mutex.
Use
go test -race on a supported platform and coordinate deliberate overlapping access. The detector observes executed races; a silent run does not prove all paths synchronized. Recovering from a map runtime failure is not a repair for the ownership and consistency defect.Sources and verification
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