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56a95ee511
Previously an assertion failure occurred when pg_stop_backup() for non-exclusive backup was aborted while it's waiting for WAL files to be archived. This assertion failure happened in do_pg_abort_backup() which was called when a non-exclusive backup was canceled. do_pg_abort_backup() assumes that there is at least one non-exclusive backup running when it's called. But pg_stop_backup() can be canceled even after it marks the end of non-exclusive backup (e.g., during waiting for WAL archiving). This broke the assumption that do_pg_abort_backup() relies on, and which caused an assertion failure. This commit changes do_pg_abort_backup() so that it does nothing when non-exclusive backup has been already marked as completed. That is, the asssumption is also changed, and do_pg_abort_backup() now can handle even the case where it's called when there is no running backup. Backpatch to 9.6 where SQL-callable non-exclusive backup was added. Author: Masahiko Sawada and Michael Paquier Reviewed-By: Robert Haas and Fujii Masao Discussion: https://www.postgresql.org/message-id/CAD21AoD2L1Fu2c==gnVASMyFAAaq3y-AQ2uEVj-zTCGFFjvmDg@mail.gmail.com