An interesting complement about the previous failing test:
Although I disabled the "flushing" feature...
sh> grep flush_after xxx/postgresql.conf
bgwriter_flush_after = 0 # 0 disables,
backend_flush_after = 0 # 0 disables,
wal_writer_flush_after = 0 # 0 disables
checkpoint_flush_after = 0 # 0 disables,
the test still fails with "head":
ERROR: could not fsync file "base/16384/16397.1": No such file or directory
ERROR: checkpoint request failed
HINT: Consult recent messages in the server log for details.
So this seem to suggest that there is an underlying issue independent from
the flushing file.
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