Thread: pgsql: Correct StartupSUBTRANS for page wraparound

Correct StartupSUBTRANS for page wraparound

StartupSUBTRANS() incorrectly handled cases near the max pageid in the subtrans
data structure, which in some cases could lead to errors in startup for Hot
Standby.
This patch wraps the pageids correctly, avoiding any such errors.
Identified by exhaustive crash testing by Jeff Janes.

Jeff Janes

Branch
------
REL9_2_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/c063d3c438d745cae11170345148f03c6f42d077

Modified Files
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src/backend/access/transam/subtrans.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)