Re: [syzbot] [mm?] INFO: rcu detected stall in seq_read_iter (2)

[Hillf Danton]

On Wed, 16 Oct 2024 08:52:22 -0700
> syzbot found the following issue on:
> 
> HEAD commit:    9e4c6c1ad9a1 Merge tag 'io_uring-6.12-20241011' of git://g..
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=161bf840580000

#syz test

--- x/virt/kvm/kvm_main.c
+++ y/virt/kvm/kvm_main.c
@@ -6387,7 +6387,7 @@ static void kvm_sched_out(struct preempt
 
 	WRITE_ONCE(vcpu->scheduled_out, true);
 
-	if (current->on_rq && vcpu->wants_to_run) {
+	if (current->on_rq && !current->se.sched_delayed && vcpu->wants_to_run) {
 		WRITE_ONCE(vcpu->preempted, true);
 		WRITE_ONCE(vcpu->ready, true);
 	}
--