From 203f2c14c4b3c7a3e8f51a5a248201e1eb091886 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Corvin=20K=C3=B6hne?= Date: Tue, 6 Sep 2022 09:06:51 +0200 Subject: [PATCH] init: fix shutdown race When calling shutdown, shutdown sends a signal to init and exits. This causes a race condition for the waitpid function. If the signal wins the race, wpid will be set to -1 and init calls death_single. If shutdown wins the race, wpid will be set to the pid of the shutdown process and the requested_transition will be ignored. Reviewed by: imp Differential Revision: https://reviews.freebsd.org/D36356 MFC after: 1 week Sponsored by: Beckhoff Automation GmbH & Co. KG --- sbin/init/init.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/sbin/init/init.c b/sbin/init/init.c index 813387f63c81..cf48721faf8d 100644 --- a/sbin/init/init.c +++ b/sbin/init/init.c @@ -1143,10 +1143,10 @@ run_script(const char *script) do { if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) collect_child(wpid); + if (requested_transition == death_single || + requested_transition == reroot) + return (state_func_t) requested_transition; if (wpid == -1) { - if (requested_transition == death_single || - requested_transition == reroot) - return (state_func_t) requested_transition; if (errno == EINTR) continue; warning("wait for %s on %s failed: %m; going to "