config: increase coro stack size if it is less than pagesize(fluent#3716

) (fluent#4434)

On some environment, PTHREAD_STACK_MIN is less than pagesize.
The coro stack size is less than page size and it causes aborting coro stack size error.
This patch is to ensure minimum coro stack size is greater equal pagesize.

Signed-off-by: Takahiro Yamashita <nokute78@gmail.com>

src/flb_config.c

@@ -232,6 +232,11 @@ struct flb_config *flb_config_init()
 
     /* Set default coroutines stack size */
     config->coro_stack_size = FLB_CORO_STACK_SIZE_BYTE;
+    if (config->coro_stack_size < getpagesize()) {
+        flb_info("[config] changing coro_stack_size from %u to %u bytes",
+                 config->coro_stack_size, getpagesize());
+        config->coro_stack_size = (unsigned int)getpagesize();
+    }
 
     /* Initialize linked lists */
     mk_list_init(&config->collectors);