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a8a0abf097
Introduce a new mode for the rqspinlock stress test that exercises a deadlock that won't be detected by the AA and ABBA checks, such that we always reliably trigger the timeout fallback. We need 4 CPUs for this particular case, as CPU 0 is untouched, and three participant CPUs for triggering the ABBCCA case. Refactor the lock acquisition paths in the module to better reflect the three modes and choose the right lock depending on the context. Also drop ABBA case from running by default as part of test progs, since the stress test can consume a significant amount of time. Acked-by: Eduard Zingerman <eddyz87@gmail.com> Reviewed-by: Amery Hung <ameryhung@gmail.com> Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20251029181828.231529-3-memxor@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2024-2025 Meta Platforms, Inc. and affiliates. */
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#include <test_progs.h>
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#include <network_helpers.h>
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#include <sys/sysinfo.h>
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#include "res_spin_lock.skel.h"
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#include "res_spin_lock_fail.skel.h"
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void test_res_spin_lock_failure(void)
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{
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RUN_TESTS(res_spin_lock_fail);
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}
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static volatile int skip;
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static void *spin_lock_thread(void *arg)
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{
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int err, prog_fd = *(u32 *) arg;
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LIBBPF_OPTS(bpf_test_run_opts, topts,
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.data_in = &pkt_v4,
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.data_size_in = sizeof(pkt_v4),
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.repeat = 10000,
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);
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while (!READ_ONCE(skip)) {
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err = bpf_prog_test_run_opts(prog_fd, &topts);
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if (err || topts.retval) {
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ASSERT_OK(err, "test_run");
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ASSERT_OK(topts.retval, "test_run retval");
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break;
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}
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}
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pthread_exit(arg);
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}
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void test_res_spin_lock_success(void)
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{
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LIBBPF_OPTS(bpf_test_run_opts, topts,
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.data_in = &pkt_v4,
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.data_size_in = sizeof(pkt_v4),
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.repeat = 1,
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);
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struct res_spin_lock *skel;
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pthread_t thread_id[16];
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int prog_fd, i, err;
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void *ret;
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if (get_nprocs() < 2) {
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test__skip();
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return;
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}
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skel = res_spin_lock__open_and_load();
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if (!ASSERT_OK_PTR(skel, "res_spin_lock__open_and_load"))
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return;
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/* AA deadlock */
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prog_fd = bpf_program__fd(skel->progs.res_spin_lock_test);
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err = bpf_prog_test_run_opts(prog_fd, &topts);
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ASSERT_OK(err, "error");
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ASSERT_OK(topts.retval, "retval");
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prog_fd = bpf_program__fd(skel->progs.res_spin_lock_test_held_lock_max);
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err = bpf_prog_test_run_opts(prog_fd, &topts);
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ASSERT_OK(err, "error");
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ASSERT_OK(topts.retval, "retval");
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/* Multi-threaded ABBA deadlock. */
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prog_fd = bpf_program__fd(skel->progs.res_spin_lock_test_AB);
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for (i = 0; i < 16; i++) {
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int err;
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err = pthread_create(&thread_id[i], NULL, &spin_lock_thread, &prog_fd);
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if (!ASSERT_OK(err, "pthread_create"))
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goto end;
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}
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topts.retval = 0;
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topts.repeat = 1000;
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int fd = bpf_program__fd(skel->progs.res_spin_lock_test_BA);
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while (!topts.retval && !err && !READ_ONCE(skel->bss->err)) {
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err = bpf_prog_test_run_opts(fd, &topts);
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}
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WRITE_ONCE(skip, true);
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for (i = 0; i < 16; i++) {
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if (!ASSERT_OK(pthread_join(thread_id[i], &ret), "pthread_join"))
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goto end;
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if (!ASSERT_EQ(ret, &prog_fd, "ret == prog_fd"))
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goto end;
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}
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ASSERT_EQ(READ_ONCE(skel->bss->err), -EDEADLK, "timeout err");
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ASSERT_OK(err, "err");
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ASSERT_EQ(topts.retval, -EDEADLK, "timeout");
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end:
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res_spin_lock__destroy(skel);
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return;
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}
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void serial_test_res_spin_lock_stress(void)
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{
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if (libbpf_num_possible_cpus() < 3) {
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test__skip();
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return;
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}
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ASSERT_OK(load_module("bpf_test_rqspinlock.ko", false), "load module AA");
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sleep(5);
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unload_module("bpf_test_rqspinlock", false);
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/*
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* Insert bpf_test_rqspinlock.ko manually with test_mode=[1|2] to test
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* other cases (ABBA, ABBCCA).
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*/
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}
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