pgsql: Acquire spinlock when updating 2PC slot data during logical deco

Acquire spinlock when updating 2PC slot data during logical decoding creation

The creation of a logical decoding context in CreateDecodingContext()
updates some data of its slot for two-phase transactions if enabled by
the caller, but the code forgot to acquire a spinlock when updating
these fields like any other code paths.  This could lead to the read of
inconsistent data.

Oversight in a8fd13c.

Author: Sawada Masahiko
Discussion: https://postgr.es/m/CAD21AoAD8_fp47191LKuecjDd3DYhoQ4TaucFco1_TEr_jQ-Zw@mail.gmail.com
Backpatch-through: 15

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/5ad165d2c024ae2fdc0a5ddd17522d5c92d7aa1a

Modified Files
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src/backend/replication/logical/logical.c | 2 ++
1 file changed, 2 insertions(+)