pgsql: Fix two bugs in setting the vm bit of empty pages. - Mailing list pgsql-committers

Fix two bugs in setting the vm bit of empty pages.

Use a critical section when setting the all-visible flag on an empty page,
and WAL-logging it. log_newpage_buffer() contains an assertion that it
must be called inside a critical section, and it's the right thing to do
when modifying a buffer anyway.

Also, the page should be marked dirty before calling log_newpage_buffer(),
per the comment in log_newpage_buffer() and src/backend/access/transam/README.

Patch by Andres Freund, in response to my report. Backpatch to 9.2, like
the patch that introduced these bugs (a6370fd9).

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/83eb54001cb69d6ee8f0813c4e280be876823068

Modified Files
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src/backend/commands/vacuumlazy.c |    7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)