D60375.id188737.diff
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	diff --git a/sys/dev/acpica/Osd/OsdSchedule.c b/sys/dev/acpica/Osd/OsdSchedule.c
	--- a/sys/dev/acpica/Osd/OsdSchedule.c
	+++ b/sys/dev/acpica/Osd/OsdSchedule.c
	@@ -156,7 +156,7 @@
	acpi_task_enqueue(int priority, ACPI_OSD_EXEC_CALLBACK Function, void *Context)
	{
	struct acpi_task_ctx *at;
	- int i;
	+ int hiwater, i;

	for (at = NULL, i = 0; i < acpi_max_tasks; i++)
	if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_FREE,
	@@ -166,8 +166,11 @@
	break;
	}

	- if (i > acpi_tasks_hiwater)
	- atomic_cmpset_int(&acpi_tasks_hiwater, acpi_tasks_hiwater, i);
	+ while (hiwater = atomic_load_int(&acpi_tasks_hiwater), i > hiwater) {
	+ if (atomic_cmpset_int(&acpi_tasks_hiwater, hiwater, i))
	+ break;
	+ cpu_spinwait();
	+ }

	if (at == NULL) {
	printf("AcpiOsExecute: Failed to enqueue task, consider increasing "