1{
 2	"BPF_ATOMIC bounds propagation, mem->reg",
 3	.insns = {
 4		/* a = 0; */
 5		/*
 6		 * Note this is implemented with two separate instructions,
 7		 * where you might think one would suffice:
 8		 *
 9		 * BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
10		 *
11		 * This is because BPF_ST_MEM doesn't seem to set the stack slot
12		 * type to 0 when storing an immediate.
13		 */
14		BPF_MOV64_IMM(BPF_REG_0, 0),
15		BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -8),
16		/* b = atomic_fetch_add(&a, 1); */
17		BPF_MOV64_IMM(BPF_REG_1, 1),
18		BPF_ATOMIC_OP(BPF_DW, BPF_ADD | BPF_FETCH, BPF_REG_10, BPF_REG_1, -8),
19		/* Verifier should be able to tell that this infinite loop isn't reachable. */
20		/* if (b) while (true) continue; */
21		BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, -1),
22		BPF_EXIT_INSN(),
23	},
24	.result = ACCEPT,
25	.result_unpriv = REJECT,
26	.errstr_unpriv = "back-edge",
27},