diff --git a/pg_query_state.c b/pg_query_state.c
index 72a9b64..9bd6771 100644
--- a/pg_query_state.c
+++ b/pg_query_state.c
@@ -618,6 +618,11 @@ pg_query_state(PG_FUNCTION_ARGS)
shm_mq_msg *msg = (shm_mq_msg *) lfirst(i);
proc_state *p_state = (proc_state *) palloc(sizeof(proc_state));
+ if (msg->result_code != QS_RETURNED)
+ continue;
+
+ AssertState(msg->result_code == QS_RETURNED);
+
qs_stack = deserialize_stack(msg->stack, msg->stack_depth);
p_state->proc = msg->proc;
@@ -856,7 +861,12 @@ SendBgWorkerPids(void)
msg->number = list_length(all_workers);
i = 0;
foreach(iter, all_workers)
- msg->pids[i++] = lfirst_int(iter);
+ {
+ pid_t current_pid = lfirst_int(iter);
+
+ AssertState(current_pid > 0);
+ msg->pids[i++] = current_pid;
+ }
shm_mq_send(mqh, msg_len, msg, false);
}
@@ -894,9 +904,10 @@ GetRemoteBackendWorkers(PGPROC *proc)
for (i = 0; i < msg->number; i++)
{
- pid_t pid = msg->pids[i];
- PGPROC *proc = BackendPidGetProc(pid);
-
+ pid_t pid = msg->pids[i];
+ PGPROC *proc = BackendPidGetProc(pid);
+ if (!proc || !proc->pid)
+ continue;
result = lcons(proc, result);
}
@@ -971,7 +982,8 @@ GetRemoteBackendQueryStates(PGPROC *leader,
foreach(iter, pworkers)
{
PGPROC *proc = (PGPROC *) lfirst(iter);
-
+ if (!proc || !proc->pid)
+ continue;
sig_result = SendProcSignal(proc->pid,
QueryStatePollReason,
proc->backendId);
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