// SPDX-License-Identifier: GPL-2.0-or-later
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/******************************************************************************
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*
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* Copyright © International Business Machines Corp., 2009
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*
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* DESCRIPTION
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* 1. Block a thread using FUTEX_WAIT
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* 2. Attempt to use FUTEX_CMP_REQUEUE_PI on the futex from 1.
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* 3. The kernel must detect the mismatch and return -EINVAL.
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*
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* AUTHOR
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* Darren Hart <dvhart@linux.intel.com>
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*
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* HISTORY
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* 2009-Nov-9: Initial version by Darren Hart <dvhart@linux.intel.com>
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*
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*****************************************************************************/
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#include <errno.h>
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#include <getopt.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include "futextest.h"
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#include "logging.h"
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#define TEST_NAME "futex-requeue-pi-mismatched-ops"
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futex_t f1 = FUTEX_INITIALIZER;
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futex_t f2 = FUTEX_INITIALIZER;
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int child_ret = 0;
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void usage(char *prog)
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{
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printf("Usage: %s\n", prog);
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printf(" -c Use color\n");
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printf(" -h Display this help message\n");
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printf(" -v L Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
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VQUIET, VCRITICAL, VINFO);
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}
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void *blocking_child(void *arg)
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{
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child_ret = futex_wait(&f1, f1, NULL, FUTEX_PRIVATE_FLAG);
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if (child_ret < 0) {
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child_ret = -errno;
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error("futex_wait\n", errno);
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}
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return (void *)&child_ret;
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}
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int main(int argc, char *argv[])
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{
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int ret = RET_PASS;
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pthread_t child;
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int c;
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while ((c = getopt(argc, argv, "chv:")) != -1) {
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switch (c) {
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case 'c':
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log_color(1);
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break;
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case 'h':
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usage(basename(argv[0]));
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exit(0);
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case 'v':
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log_verbosity(atoi(optarg));
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break;
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default:
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usage(basename(argv[0]));
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exit(1);
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}
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}
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ksft_print_header();
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ksft_set_plan(1);
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ksft_print_msg("%s: Detect mismatched requeue_pi operations\n",
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basename(argv[0]));
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if (pthread_create(&child, NULL, blocking_child, NULL)) {
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error("pthread_create\n", errno);
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ret = RET_ERROR;
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goto out;
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}
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/* Allow the child to block in the kernel. */
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sleep(1);
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/*
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* The kernel should detect the waiter did not setup the
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* q->requeue_pi_key and return -EINVAL. If it does not,
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* it likely gave the lock to the child, which is now hung
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* in the kernel.
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*/
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ret = futex_cmp_requeue_pi(&f1, f1, &f2, 1, 0, FUTEX_PRIVATE_FLAG);
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if (ret < 0) {
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if (errno == EINVAL) {
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/*
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* The kernel correctly detected the mismatched
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* requeue_pi target and aborted. Wake the child with
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* FUTEX_WAKE.
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*/
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ret = futex_wake(&f1, 1, FUTEX_PRIVATE_FLAG);
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if (ret == 1) {
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ret = RET_PASS;
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} else if (ret < 0) {
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error("futex_wake\n", errno);
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ret = RET_ERROR;
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} else {
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error("futex_wake did not wake the child\n", 0);
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ret = RET_ERROR;
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}
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} else {
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error("futex_cmp_requeue_pi\n", errno);
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ret = RET_ERROR;
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}
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} else if (ret > 0) {
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fail("futex_cmp_requeue_pi failed to detect the mismatch\n");
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ret = RET_FAIL;
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} else {
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error("futex_cmp_requeue_pi found no waiters\n", 0);
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ret = RET_ERROR;
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}
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pthread_join(child, NULL);
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if (!ret)
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ret = child_ret;
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out:
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/* If the kernel crashes, we shouldn't return at all. */
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print_result(TEST_NAME, ret);
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return ret;
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}
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