tests: add tests to reproduce #10881

tests/thread_msg_block_race/Makefile

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+DEVELHELP := 1
+
+include ../Makefile.tests_common
+
+BOARD_INSUFFICIENT_MEMORY := arduino-duemilanove arduino-nano arduino-uno \
+                             nucleo-f031k6
+
+DISABLE_MODULE += auto_init
+FEATURES_REQUIRED += periph_timer
+USEMODULE += random
+
+TEST_ON_CI_WHITELIST += all
+
+include $(RIOTBASE)/Makefile.include

tests/thread_msg_block_race/main.c

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+/*
+ * Copyright (C) 2019 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup tests
+ * @{
+ *
+ * @file
+ * @brief   Thread race condition test application to reproduce
+ *          https://github.com/RIOT-OS/RIOT/issues/10881
+ *
+ * @author  Martine Lenders <m.lenders@fu-berlin.de>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+
+#include "periph/timer.h"
+#include "random.h"
+#include "thread.h"
+#include "msg.h"
+
+#define CANARY_TYPE         (0x21fd)
+
+#define TIMER_FREQ          (1000000LU)
+#define TIMER_TIMEOUT_MIN   (1U)
+#define TIMER_TIMEOUT_MAX   (100U)
+
+static char _stack[THREAD_STACKSIZE_DEFAULT];
+
+static kernel_pid_t _pid_main = KERNEL_PID_UNDEF;
+
+/**
+ * @brief   Schedule next timer event in TIMER_TIMEOUT_MIN to TIMER_TIMEOUT_MAX
+ *          ticks.
+ */
+static void _sched_next(void)
+{
+    timer_set(TIMER_DEV(0), 0, random_uint32_range(TIMER_TIMEOUT_MIN,
+                                                   TIMER_TIMEOUT_MAX));
+}
+
+/**
+ * @brief   The timer interrupt
+ */
+static void _timer(void *arg, int channel)
+{
+    (void)arg;
+    (void)channel;
+    /* just continue rescheduling interrupt triggering at random time */
+    _sched_next();
+}
+
+/**
+ * @brief   The sending thread
+ */
+static void *_thread(void *arg)
+{
+    (void) arg;
+
+    while (1) {
+        msg_t msg = { .type = 0U };
+
+        write(STDOUT_FILENO, ".", 1U);
+        /* send without blocking */
+        msg_try_send(&msg, _pid_main);
+        thread_yield();
+    }
+
+    return NULL;
+}
+
+int main(void)
+{
+    kernel_pid_t pid;
+
+    timer_init(TIMER_DEV(0), TIMER_FREQ, _timer, NULL);
+    random_init(timer_read(TIMER_DEV(0)));
+    puts("Test is \"successful\" if it runs forever without halting\n"
+         "on any of the assertion in this file\n");
+    _pid_main = sched_active_pid;
+
+    puts("I will try to trigger an interrupt at random intervals. When an\n"
+         "interrupt is fired while ISR is disable in the thread_yield_higher()\n"
+         "function some platform-specific implementations used to not call\n"
+         "sched_run() which was the cause of the bug tested here");
+    _sched_next();
+    pid = thread_create(_stack, sizeof(_stack), THREAD_PRIORITY_MAIN + 1,
+                        THREAD_CREATE_WOUT_YIELD | THREAD_CREATE_STACKTEST,
+                        _thread, NULL, "nr2");
+    assert(pid != KERNEL_PID_UNDEF);
+
+    while (1) {
+        msg_t msg = { .type = CANARY_TYPE };
+
+        /* receive blocked */
+        msg_receive(&msg);
+        /* check msg_receive() returned without blocking (i.e. the sending
+         * thread did not get a chance to copy the message over) */
+        if (msg.type == CANARY_TYPE) {
+            puts("Message was not written");
+            return 1;
+        }
+        write(STDOUT_FILENO, "\b", 1U);
+    }
+    return 0;
+}

tests/thread_msg_block_race/tests/01-run.py

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+#!/usr/bin/env python3
+
+# Copyright (C) 2019 Freie Universität Berlin
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+
+import sys
+from testrunner import run
+from pexpect import TIMEOUT
+
+
+def testfunc(child):
+    res = child.expect([TIMEOUT, "Message was not written"])
+    # we actually want the timeout here. The application runs into an assertion
+    # pretty quickly when failing and runs forever on success
+    assert(res == 0)
+
+
+if __name__ == "__main__":
+    sys.exit(run(testfunc, timeout=10))