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Merge pull request #25398 from apolcyn/fix_bad_locking

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Fix races in resolve_address and resolve_address_posix tests
pull/25241/head
apolcyn 4 years ago committed by GitHub
parent 8e8e697264 6d8e7d3819
commit 711d1d7fe2
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 44 additions and 49 deletions
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  1. 40
      test/core/iomgr/resolve_address_posix_test.cc
  2. 53
      test/core/iomgr/resolve_address_test.cc

40
test/core/iomgr/resolve_address_posix_test.cc
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@ -50,9 +50,9 @@ typedef struct args_struct {
grpc_core::Thread thd;
gpr_event ev;
grpc_resolved_addresses* addrs;
gpr_atm done_atm;
gpr_mu* mu;
grpc_pollset* pollset;
bool done; // guarded by mu
grpc_pollset* pollset; // guarded by mu
grpc_pollset_set* pollset_set;
} args_struct;
@ -65,6 +65,7 @@ void args_init(args_struct* args) {
args->pollset_set = grpc_pollset_set_create();
grpc_pollset_set_add_pollset(args->pollset_set, args->pollset);
args->addrs = nullptr;
args->done = false;
}
void args_finish(args_struct* args) {
@ -95,25 +96,24 @@ static void actually_poll(void* argsp) {
grpc_millis deadline = n_sec_deadline(10);
while (true) {
grpc_core::ExecCtx exec_ctx;
bool done = gpr_atm_acq_load(&args->done_atm) != 0;
if (done) {
break;
{
grpc_core::MutexLockForGprMu lock(args->mu);
if (args->done) {
break;
}
grpc_millis time_left = deadline - grpc_core::ExecCtx::Get()->Now();
gpr_log(GPR_DEBUG, "done=%d, time_left=%" PRId64, args->done, time_left);
GPR_ASSERT(time_left >= 0);
grpc_pollset_worker* worker = nullptr;
GRPC_LOG_IF_ERROR(
"pollset_work",
grpc_pollset_work(args->pollset, &worker, n_sec_deadline(1)));
}
grpc_millis time_left = deadline - grpc_core::ExecCtx::Get()->Now();
gpr_log(GPR_DEBUG, "done=%d, time_left=%" PRId64, done, time_left);
GPR_ASSERT(time_left >= 0);
grpc_pollset_worker* worker = nullptr;
gpr_mu_lock(args->mu);
GRPC_LOG_IF_ERROR("pollset_work", grpc_pollset_work(args->pollset, &worker,
n_sec_deadline(1)));
gpr_mu_unlock(args->mu);
grpc_core::ExecCtx::Get()->Flush();
}
gpr_event_set(&args->ev, reinterpret_cast<void*>(1));
}
static void poll_pollset_until_request_done(args_struct* args) {
gpr_atm_rel_store(&args->done_atm, 0);
args->thd = grpc_core::Thread("grpc_poll_pollset", actually_poll, args);
args->thd.Start();
}
@ -123,19 +123,17 @@ static void must_succeed(void* argsp, grpc_error* err) {
GPR_ASSERT(err == GRPC_ERROR_NONE);
GPR_ASSERT(args->addrs != nullptr);
GPR_ASSERT(args->addrs->naddrs > 0);
gpr_atm_rel_store(&args->done_atm, 1);
gpr_mu_lock(args->mu);
grpc_core::MutexLockForGprMu lock(args->mu);
args->done = true;
GRPC_LOG_IF_ERROR("pollset_kick", grpc_pollset_kick(args->pollset, nullptr));
gpr_mu_unlock(args->mu);
}
static void must_fail(void* argsp, grpc_error* err) {
args_struct* args = static_cast<args_struct*>(argsp);
GPR_ASSERT(err != GRPC_ERROR_NONE);
gpr_atm_rel_store(&args->done_atm, 1);
gpr_mu_lock(args->mu);
grpc_core::MutexLockForGprMu lock(args->mu);
args->done = true;
GRPC_LOG_IF_ERROR("pollset_kick", grpc_pollset_kick(args->pollset, nullptr));
gpr_mu_unlock(args->mu);
}
static void resolve_address_must_succeed(const char* target) {

53
test/core/iomgr/resolve_address_test.cc
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@ -29,6 +29,7 @@
#include "src/core/ext/filters/client_channel/resolver/dns/dns_resolver_selection.h"
#include "src/core/lib/gpr/string.h"
#include "src/core/lib/gprpp/sync.h"
#include "src/core/lib/iomgr/executor.h"
#include "src/core/lib/iomgr/iomgr.h"
#include "test/core/util/cmdline.h"
@ -41,9 +42,9 @@ static gpr_timespec test_deadline(void) {
typedef struct args_struct {
gpr_event ev;
grpc_resolved_addresses* addrs;
gpr_atm done_atm;
gpr_mu* mu;
grpc_pollset* pollset;
bool done; // guarded by mu
grpc_pollset* pollset; // guarded by mu
grpc_pollset_set* pollset_set;
} args_struct;
@ -56,7 +57,7 @@ void args_init(args_struct* args) {
args->pollset_set = grpc_pollset_set_create();
grpc_pollset_set_add_pollset(args->pollset_set, args->pollset);
args->addrs = nullptr;
gpr_atm_rel_store(&args->done_atm, 0);
args->done = false;
}
void args_finish(args_struct* args) {
@ -82,24 +83,24 @@ static grpc_millis n_sec_deadline(int seconds) {
}
static void poll_pollset_until_request_done(args_struct* args) {
grpc_core::ExecCtx exec_ctx;
// Try to give enough time for c-ares to run through its retries
// a few times if needed.
grpc_millis deadline = n_sec_deadline(90);
while (true) {
bool done = gpr_atm_acq_load(&args->done_atm) != 0;
if (done) {
break;
grpc_core::ExecCtx exec_ctx;
{
grpc_core::MutexLockForGprMu lock(args->mu);
if (args->done) {
break;
}
grpc_millis time_left = deadline - grpc_core::ExecCtx::Get()->Now();
gpr_log(GPR_DEBUG, "done=%d, time_left=%" PRId64, args->done, time_left);
GPR_ASSERT(time_left >= 0);
grpc_pollset_worker* worker = nullptr;
GRPC_LOG_IF_ERROR(
"pollset_work",
grpc_pollset_work(args->pollset, &worker, n_sec_deadline(1)));
}
grpc_millis time_left = deadline - grpc_core::ExecCtx::Get()->Now();
gpr_log(GPR_DEBUG, "done=%d, time_left=%" PRId64, done, time_left);
GPR_ASSERT(time_left >= 0);
grpc_pollset_worker* worker = nullptr;
gpr_mu_lock(args->mu);
GRPC_LOG_IF_ERROR("pollset_work", grpc_pollset_work(args->pollset, &worker,
n_sec_deadline(1)));
gpr_mu_unlock(args->mu);
grpc_core::ExecCtx::Get()->Flush();
}
gpr_event_set(&args->ev, reinterpret_cast<void*>(1));
}
@ -109,19 +110,17 @@ static void must_succeed(void* argsp, grpc_error* err) {
GPR_ASSERT(err == GRPC_ERROR_NONE);
GPR_ASSERT(args->addrs != nullptr);
GPR_ASSERT(args->addrs->naddrs > 0);
gpr_atm_rel_store(&args->done_atm, 1);
gpr_mu_lock(args->mu);
grpc_core::MutexLockForGprMu lock(args->mu);
args->done = true;
GRPC_LOG_IF_ERROR("pollset_kick", grpc_pollset_kick(args->pollset, nullptr));
gpr_mu_unlock(args->mu);
}
static void must_fail(void* argsp, grpc_error* err) {
args_struct* args = static_cast<args_struct*>(argsp);
GPR_ASSERT(err != GRPC_ERROR_NONE);
gpr_atm_rel_store(&args->done_atm, 1);
gpr_mu_lock(args->mu);
grpc_core::MutexLockForGprMu lock(args->mu);
args->done = true;
GRPC_LOG_IF_ERROR("pollset_kick", grpc_pollset_kick(args->pollset, nullptr));
gpr_mu_unlock(args->mu);
}
// This test assumes the environment has an ipv6 loopback
@ -133,10 +132,9 @@ static void must_succeed_with_ipv6_first(void* argsp, grpc_error* err) {
const struct sockaddr* first_address =
reinterpret_cast<const struct sockaddr*>(args->addrs->addrs[0].addr);
GPR_ASSERT(first_address->sa_family == AF_INET6);
gpr_atm_rel_store(&args->done_atm, 1);
gpr_mu_lock(args->mu);
grpc_core::MutexLockForGprMu lock(args->mu);
args->done = true;
GRPC_LOG_IF_ERROR("pollset_kick", grpc_pollset_kick(args->pollset, nullptr));
gpr_mu_unlock(args->mu);
}
static void must_succeed_with_ipv4_first(void* argsp, grpc_error* err) {
@ -147,10 +145,9 @@ static void must_succeed_with_ipv4_first(void* argsp, grpc_error* err) {
const struct sockaddr* first_address =
reinterpret_cast<const struct sockaddr*>(args->addrs->addrs[0].addr);
GPR_ASSERT(first_address->sa_family == AF_INET);
gpr_atm_rel_store(&args->done_atm, 1);
gpr_mu_lock(args->mu);
grpc_core::MutexLockForGprMu lock(args->mu);
args->done = true;
GRPC_LOG_IF_ERROR("pollset_kick", grpc_pollset_kick(args->pollset, nullptr));
gpr_mu_unlock(args->mu);
}
static void test_localhost(void) {

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