visibility: fix slot race

[darthunix]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 95 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
executor/src/pgscan.rs	0.00%	58 Missing ⚠️
executor/src/shm.rs	0.00%	16 Missing ⚠️
postgres/src/backend.rs	0.00%	12 Missing ⚠️
executor/src/server.rs	0.00%	9 Missing ⚠️

Files with missing lines	Coverage Δ
executor/src/server.rs	0.00% <0.00%> (-47.52%)	⬇️
postgres/src/backend.rs	0.00% <0.00%> (ø)
executor/src/shm.rs	0.00% <0.00%> (ø)
executor/src/pgscan.rs	0.00% <0.00%> (-32.69%)	⬇️

... and 16 files with indirect coverage changes

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