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libvirt/tests/eventtest.c
Pavel Hrdina 933ad86002 tests: fix deadlock in eventtest 
There is a race deadlock in eventtest after the recent rewrite to drop
GNULIB from libvirt code base.

The issue happens when the callbacks testPipeReader() or testTimer()
are called before waitEvents() starts waiting on `eventThreadCond`.
It will never happen because the callbacks are already done and there
is nothing that will signal the condition again.

Reported-by: Peter Krempa <pkrempa@redhat.com>
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
2020-02-06 13:41:03 +01:00

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/*
* eventtest.c: Test the libvirtd event loop impl
*
* Copyright (C) 2009, 2011-2014 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <signal.h>
#include <time.h>
#if HAVE_MACH_CLOCK_ROUTINES
# include <mach/clock.h>
# include <mach/mach.h>
#endif
#include "testutils.h"
#include "internal.h"
#include "virfile.h"
#include "virthread.h"
#include "virlog.h"
#include "virutil.h"
#include "virevent.h"
VIR_LOG_INIT("tests.eventtest");
#define NUM_FDS 31
#define NUM_TIME 31
static pthread_mutex_t eventThreadMutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t eventThreadCond = PTHREAD_COND_INITIALIZER;
static bool eventThreadSignaled;
static struct handleInfo {
int pipeFD[2];
int fired;
int watch;
int error;
int delete;
} handles[NUM_FDS];
static struct timerInfo {
int timeout;
int timer;
int fired;
int error;
int delete;
} timers[NUM_TIME];
enum {
EV_ERROR_NONE,
EV_ERROR_WATCH,
EV_ERROR_FD,
EV_ERROR_EVENT,
EV_ERROR_DATA,
};
struct testEventResultData {
bool failed;
const char *msg;
};
static int
testEventResultCallback(const void *opaque)
{
const struct testEventResultData *data = opaque;
if (data->failed && data->msg)
fprintf(stderr, "%s", data->msg);
return data->failed;
}
static void
G_GNUC_PRINTF(3, 4)
testEventReport(const char *name, bool failed, const char *msg, ...)
{
va_list vargs;
va_start(vargs, msg);
char *str = NULL;
struct testEventResultData data;
if (msg)
str = g_strdup_vprintf(msg, vargs);
data.failed = failed;
data.msg = str;
ignore_value(virTestRun(name, testEventResultCallback, &data));
va_end(vargs);
VIR_FREE(str);
}
static void
testPipeReader(int watch, int fd, int events, void *data)
{
struct handleInfo *info = data;
char one;
VIR_DEBUG("Handle callback watch=%d fd=%d ev=%d", watch, fd, events);
pthread_mutex_lock(&eventThreadMutex);
info->fired = 1;
if (watch != info->watch) {
info->error = EV_ERROR_WATCH;
goto cleanup;
}
if (fd != info->pipeFD[0]) {
info->error = EV_ERROR_FD;
goto cleanup;
}
if (!(events & VIR_EVENT_HANDLE_READABLE)) {
info->error = EV_ERROR_EVENT;
goto cleanup;
}
if (read(fd, &one, 1) != 1) {
info->error = EV_ERROR_DATA;
goto cleanup;
}
info->error = EV_ERROR_NONE;
if (info->delete != -1)
virEventRemoveHandle(info->delete);
cleanup:
pthread_cond_signal(&eventThreadCond);
eventThreadSignaled = true;
pthread_mutex_unlock(&eventThreadMutex);
}
static void
testTimer(int timer, void *data)
{
struct timerInfo *info = data;
VIR_DEBUG("Timer callback timer=%d", timer);
pthread_mutex_lock(&eventThreadMutex);
info->fired = 1;
if (timer != info->timer) {
info->error = EV_ERROR_WATCH;
goto cleanup;
}
info->error = EV_ERROR_NONE;
if (info->delete != -1)
virEventRemoveTimeout(info->delete);
cleanup:
pthread_cond_signal(&eventThreadCond);
eventThreadSignaled = true;
pthread_mutex_unlock(&eventThreadMutex);
}
G_GNUC_NORETURN static void *eventThreadLoop(void *data G_GNUC_UNUSED) {
while (1)
virEventRunDefaultImpl();
abort();
}
static void
waitEvents(int nhandle, int ntimer)
{
int ngothandle = 0;
int ngottimer = 0;
size_t i;
VIR_DEBUG("Wait events nhandle %d ntimer %d",
nhandle, ntimer);
while (ngothandle != nhandle || ngottimer != ntimer) {
while (!eventThreadSignaled)
pthread_cond_wait(&eventThreadCond, &eventThreadMutex);
eventThreadSignaled = false;
ngothandle = ngottimer = 0;
for (i = 0; i < NUM_FDS; i++) {
if (handles[i].fired)
ngothandle++;
}
for (i = 0; i < NUM_TIME; i++) {
if (timers[i].fired)
ngottimer++;
}
VIR_DEBUG("Wait events ngothandle %d ngottimer %d",
ngothandle, ngottimer);
}
}
static int
verifyFired(const char *name, int handle, int timer)
{
int handleFired = 0;
int timerFired = 0;
size_t i;
VIR_DEBUG("Verify fired handle %d timer %d", handle, timer);
for (i = 0; i < NUM_FDS; i++) {
if (handles[i].fired) {
if (i != handle) {
testEventReport(name, 1,
"Handle %zu fired, but expected %d\n", i,
handle);
return EXIT_FAILURE;
} else {
if (handles[i].error != EV_ERROR_NONE) {
testEventReport(name, 1,
"Handle %zu fired, but had error %d\n", i,
handles[i].error);
return EXIT_FAILURE;
}
handleFired = 1;
}
} else {
if (i == handle) {
testEventReport(name, 1,
"Handle %d should have fired, but didn't\n",
handle);
return EXIT_FAILURE;
}
}
}
if (handleFired != 1 && handle != -1) {
testEventReport(name, 1,
"Something weird happened, expecting handle %d\n",
handle);
return EXIT_FAILURE;
}
for (i = 0; i < NUM_TIME; i++) {
if (timers[i].fired) {
if (i != timer) {
testEventReport(name, 1,
"Timer %zu fired, but expected %d\n", i, timer);
return EXIT_FAILURE;
} else {
if (timers[i].error != EV_ERROR_NONE) {
testEventReport(name, 1,
"Timer %zu fired, but had error %d\n", i,
timers[i].error);
return EXIT_FAILURE;
}
timerFired = 1;
}
} else {
if (i == timer) {
testEventReport(name, 1,
"Timer %d should have fired, but didn't\n",
timer);
return EXIT_FAILURE;
}
}
}
if (timerFired != 1 && timer != -1) {
testEventReport(name, 1,
"Something weird happened, expecting timer %d\n",
timer);
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
static int
finishJob(const char *name, int handle, int timer)
{
pthread_mutex_lock(&eventThreadMutex);
waitEvents(handle == -1 ? 0 : 1,
timer == -1 ? 0 : 1);
if (verifyFired(name, handle, timer) != EXIT_SUCCESS) {
pthread_mutex_unlock(&eventThreadMutex);
return EXIT_FAILURE;
}
testEventReport(name, 0, NULL);
pthread_mutex_unlock(&eventThreadMutex);
return EXIT_SUCCESS;
}
static void
resetAll(void)
{
size_t i;
pthread_mutex_lock(&eventThreadMutex);
for (i = 0; i < NUM_FDS; i++) {
handles[i].fired = 0;
handles[i].error = EV_ERROR_NONE;
}
for (i = 0; i < NUM_TIME; i++) {
timers[i].fired = 0;
timers[i].error = EV_ERROR_NONE;
}
pthread_mutex_unlock(&eventThreadMutex);
}
static int
mymain(void)
{
size_t i;
pthread_t eventThread;
char one = '1';
for (i = 0; i < NUM_FDS; i++) {
if (virPipeQuiet(handles[i].pipeFD) < 0) {
fprintf(stderr, "Cannot create pipe: %d", errno);
return EXIT_FAILURE;
}
}
char *debugEnv = getenv("LIBVIRT_DEBUG");
if (debugEnv && *debugEnv &&
(virLogSetDefaultPriority(virLogParseDefaultPriority(debugEnv)) < 0)) {
fprintf(stderr, "Invalid log level setting.\n");
return EXIT_FAILURE;
}
virEventRegisterDefaultImpl();
for (i = 0; i < NUM_FDS; i++) {
handles[i].delete = -1;
handles[i].watch =
virEventAddHandle(handles[i].pipeFD[0],
VIR_EVENT_HANDLE_READABLE,
testPipeReader,
&handles[i], NULL);
}
for (i = 0; i < NUM_TIME; i++) {
timers[i].delete = -1;
timers[i].timeout = -1;
timers[i].timer =
virEventAddTimeout(timers[i].timeout,
testTimer,
&timers[i], NULL);
}
pthread_create(&eventThread, NULL, eventThreadLoop, NULL);
/* First time, is easy - just try triggering one of our
* registered handles */
if (safewrite(handles[1].pipeFD[1], &one, 1) != 1)
return EXIT_FAILURE;
if (finishJob("Simple write", 1, -1) != EXIT_SUCCESS)
return EXIT_FAILURE;
resetAll();
/* Now lets delete one before starting poll(), and
* try triggering another handle */
virEventRemoveHandle(handles[0].watch);
if (safewrite(handles[1].pipeFD[1], &one, 1) != 1)
return EXIT_FAILURE;
if (finishJob("Deleted before poll", 1, -1) != EXIT_SUCCESS)
return EXIT_FAILURE;
resetAll();
/* Next lets delete *during* poll, which should interrupt
* the loop with no event showing */
virEventRemoveHandle(handles[1].watch);
if (finishJob("Interrupted during poll", -1, -1) != EXIT_SUCCESS)
return EXIT_FAILURE;
resetAll();
/* Getting more fun, lets delete a later handle during dispatch */
handles[2].delete = handles[3].watch;
if (safewrite(handles[2].pipeFD[1], &one, 1) != 1
|| safewrite(handles[3].pipeFD[1], &one, 1) != 1)
return EXIT_FAILURE;
if (finishJob("Deleted during dispatch", 2, -1) != EXIT_SUCCESS)
return EXIT_FAILURE;
resetAll();
/* Extreme fun, lets delete ourselves during dispatch */
handles[2].delete = handles[2].watch;
if (safewrite(handles[2].pipeFD[1], &one, 1) != 1)
return EXIT_FAILURE;
if (finishJob("Deleted during dispatch", 2, -1) != EXIT_SUCCESS)
return EXIT_FAILURE;
resetAll();
/* Run a timer on its own */
virEventUpdateTimeout(timers[1].timer, 100);
if (finishJob("Firing a timer", -1, 1) != EXIT_SUCCESS)
return EXIT_FAILURE;
virEventUpdateTimeout(timers[1].timer, -1);
resetAll();
/* Now lets delete one before starting poll(), and
* try triggering another timer */
virEventUpdateTimeout(timers[1].timer, 100);
virEventRemoveTimeout(timers[0].timer);
if (finishJob("Deleted before poll", -1, 1) != EXIT_SUCCESS)
return EXIT_FAILURE;
virEventUpdateTimeout(timers[1].timer, -1);
resetAll();
/* Next lets delete *during* poll, which should interrupt
* the loop with no event showing */
virEventRemoveTimeout(timers[1].timer);
if (finishJob("Interrupted during poll", -1, -1) != EXIT_SUCCESS)
return EXIT_FAILURE;
resetAll();
/* Getting more fun, lets delete a later timer during dispatch */
virEventUpdateTimeout(timers[2].timer, 100);
virEventUpdateTimeout(timers[3].timer, 100);
timers[2].delete = timers[3].timer;
if (finishJob("Deleted during dispatch", -1, 2) != EXIT_SUCCESS)
return EXIT_FAILURE;
virEventUpdateTimeout(timers[2].timer, -1);
resetAll();
/* Extreme fun, lets delete ourselves during dispatch */
virEventUpdateTimeout(timers[2].timer, 100);
timers[2].delete = timers[2].timer;
if (finishJob("Deleted during dispatch", -1, 2) != EXIT_SUCCESS)
return EXIT_FAILURE;
for (i = 0; i < NUM_FDS - 1; i++)
virEventRemoveHandle(handles[i].watch);
for (i = 0; i < NUM_TIME - 1; i++)
virEventRemoveTimeout(timers[i].timer);
resetAll();
/* Make sure the last handle still works several times in a row. */
for (i = 0; i < 4; i++) {
if (safewrite(handles[NUM_FDS - 1].pipeFD[1], &one, 1) != 1)
return EXIT_FAILURE;
if (finishJob("Simple write", NUM_FDS - 1, -1) != EXIT_SUCCESS)
return EXIT_FAILURE;
resetAll();
}
/* Final test, register same FD twice, once with no
* events, and make sure the right callback runs */
handles[0].pipeFD[0] = handles[1].pipeFD[0];
handles[0].pipeFD[1] = handles[1].pipeFD[1];
handles[0].watch = virEventAddHandle(handles[0].pipeFD[0],
0,
testPipeReader,
&handles[0], NULL);
handles[1].watch = virEventAddHandle(handles[1].pipeFD[0],
VIR_EVENT_HANDLE_READABLE,
testPipeReader,
&handles[1], NULL);
if (safewrite(handles[1].pipeFD[1], &one, 1) != 1)
return EXIT_FAILURE;
if (finishJob("Write duplicate", 1, -1) != EXIT_SUCCESS)
return EXIT_FAILURE;
/* pthread_kill(eventThread, SIGTERM); */
return EXIT_SUCCESS;
}
VIR_TEST_MAIN(mymain)
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