diff --git a/NEWS b/NEWS
index f071e09bafc..ec7c09c247b 100644
--- a/NEWS
+++ b/NEWS
@@ -20,6 +20,9 @@ PHP                                                                        NEWS
 - FFI:
   . Fixed incorrect bitshifting and masking in ffi bitfield. (nielsdos)
 
+- FPM:
+  . Fixed bug GH-10315 (FPM unknown child alert not valid). (Jakub Zelenka)
+
 - GMP:
   . Properly implement GMP::__construct(). (nielsdos)
 
diff --git a/sapi/fpm/fpm/fpm_children.c b/sapi/fpm/fpm/fpm_children.c
index 6a5787c7ec8..2f8e3dc4d0a 100644
--- a/sapi/fpm/fpm/fpm_children.c
+++ b/sapi/fpm/fpm/fpm_children.c
@@ -297,8 +297,10 @@ void fpm_children_bury(void)
 					break;
 				}
 			}
+		} else if (fpm_globals.parent_pid == 1) {
+			zlog(ZLOG_DEBUG, "unknown child (%d) exited %s - most likely an orphan process (master process is the init process)", pid, buf);
 		} else {
-			zlog(ZLOG_ALERT, "oops, unknown child (%d) exited %s. Please open a bug report (https://github.com/php/php-src/issues).", pid, buf);
+			zlog(ZLOG_WARNING, "unknown child (%d) exited %s - potentially a bug or pre exec child (e.g. s6-notifyoncheck)", pid, buf);
 		}
 	}
 }