[pgpool-committers: 10195] pgpool: Fix Pgpool-II child process crash during shutdown.

[Tatsuo Ishii]

Fix Pgpool-II child process crash during shutdown.

It is reported that pgpool child process crashes during shutdown.
[pgpool-general: 9261] Re: Segmentation fault during shutdown

The actual crash was in close_all_backend_connections().
close_all_backend_connections() was called because on_system_exit
registers child_will_go_down(). At the moment it seems pgpool child
had just started up and doing pool_init_cp(). The connection pool
object had not been completely initialized, that's cause of the crash.

To fix this, introduce a new static variable in child.c and set it
true when the connection pool object is initialized. In
child_will_go_down() it is checked and close_all_backend_connections()
is called only when the variable is set to true.

Problem reported and analyzed by: Emond Papegaaij
Backpatch-through: v4.2
Discussion: https://www.pgpool.net/pipermail/pgpool-general/2024-November/001938.html

Branch
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V4_4_STABLE

Details
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https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=a690ce0309df74a962bae8ac3cb9beb8eac1ae71

Modified Files
--------------
src/protocol/child.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)