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b135beb077
Add a test to stress bpf_timer_start and map_delete race Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20260201025403.66625-10-alexei.starovoitov@gmail.com
67 lines
1.3 KiB
C
67 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2026 Meta Platforms, Inc. and affiliates. */
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#include <linux/bpf.h>
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#include <time.h>
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#include <bpf/bpf_helpers.h>
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#define ITER_CNT 2000
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struct map_value {
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struct bpf_timer timer;
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};
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__type(key, int);
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__type(value, struct map_value);
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__uint(max_entries, 1);
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} timer_map SEC(".maps");
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long cb_cnt;
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/*
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* Timer callback that accesses the map value.
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* If the race bug exists and this runs on freed memory,
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* KASAN should detect it.
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*/
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static int timer_cb(void *map, int *key, struct map_value *value)
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{
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__sync_fetch_and_add(&cb_cnt, 1);
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return 0;
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}
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SEC("syscall")
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int start_timer(void *ctx)
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{
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struct map_value *value;
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int i;
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for (i = 0; i < ITER_CNT; i++) {
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int key = 0;
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value = bpf_map_lookup_elem(&timer_map, &key);
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/* hey claude, no if (!value) here. The verifier got smarter */
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bpf_timer_init(&value->timer, &timer_map, CLOCK_MONOTONIC);
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bpf_timer_set_callback(&value->timer, timer_cb);
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bpf_timer_start(&value->timer, 100000000, 0);
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}
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return 0;
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}
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SEC("syscall")
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int delete_elem(void *ctx)
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{
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int i;
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for (i = 0; i < ITER_CNT; i++) {
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int key = 0;
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bpf_map_delete_elem(&timer_map, &key);
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}
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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