stack1772, stack1776, stack1780, stack1784, stack1788, stack1792,
	stack1796, stack1800, stack1804, stack1808, stack1812, stack1816,
	stack1820, stack1824, stack1828, stack1832, stack1836, stack1840,
	stack1844, stack1848, stack1852, stack1856, stack1860, stack1864,
	stack1868, stack1872, stack1876, stack1880, stack1884, stack1888,
	stack1892, stack1896, stack1900, stack1904, stack1908, stack1912,

	// Next, verify that switching stacks doesn't break callbacks.

	char *stack1 = malloc(STACK_SIZE);
	if (stack1 == NULL) {
		perror("malloc");
		exit(1);
	}

	// Allocate the second stack before freeing the first to ensure we don't get
	// the same address from malloc.
	//
	// Will be freed in stackSwitchThread2.
	stack2 = malloc(STACK_SIZE);
	if (stack1 == NULL) {
		perror("malloc");
		exit(1);
	}

}

func TestShrinkStackDuringBlockedSend(t *testing.T) {
	// make sure that channel operations still work when we are
	// blocked on a channel send and we shrink the stack.
	// NOTE: this test probably won't fail unless stack1.go:stackDebug
	// is set to >= 1.
	const n = 10
	c := make(chan int)
	done := make(chan struct{})

	go func() {
		for i := 0; i < n; i++ {
			c <- i
			// use lots of stack, briefly.