[pgpool-committers: 10155] pgpool: Fix pgpool crash when pgpool child process exits.

[Tatsuo Ishii]

Fix pgpool crash when pgpool child process exits.

When a pgpool child process exits, close_all_backend_connections() is
called, which is responsible for closing all connections to backend in
the connection pool. It used mistakenly MAIN_CONNECTION macro, which
is fine for current active connections but is not good for pooled
connections because a main node could be different at the time when
the connection pool was created. Fix is using in_use_backend()
instead.

Reported-by: Emond Papegaaij
Backpatch-through: v4.2

Branch
------
V4_5_STABLE

Details
-------
https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=2280851706fa9ceb5f836bc12b798d909a515c28

Modified Files
--------------
src/protocol/pool_connection_pool.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)