Re: [syzbot] [cgroups?] INFO: task hung in cgroup_subtree_control_write (2)

[Hillf Danton]

> Date: Mon, 15 Jun 2026 01:05:28 -0700
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    ec039126b7fa Add linux-next specific files for 20260611
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=178e637a580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=d0d1fa2afcbce17c
> dashboard link: https://syzkaller.appspot.com/bug?extid=bb2e19a1190a556c01b1
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10b0d4ae580000

#syz test

--- x/kernel/cgroup/cgroup.c
+++ y/kernel/cgroup/cgroup.c
@@ -3264,7 +3264,7 @@ restart:
 			struct cgroup_subsys_state *css = cgroup_css(dsct, ss);
 			DEFINE_WAIT(wait);
 
-			if (!css || !css_is_dying(css))
+			if (!css || !css_is_online(css))
 				continue;
 
 			cgroup_get_live(dsct);
--