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src: fix node watchdog race condition

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PR-URL: https://github.com/nodejs/node/pull/43780
Fixes: https://github.com/nodejs/node/issues/43699
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
This commit is contained in:
theanarkh 2022-07-15 07:56:39 +08:00 committed by GitHub
parent eabd1c2dbc
commit 4917f444e6
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 30 additions and 0 deletions
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6
src/node_watchdog.cc
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@ -102,6 +102,7 @@ void Watchdog::Timer(uv_timer_t* timer) {
SigintWatchdog::SigintWatchdog(
v8::Isolate* isolate, bool* received_signal)
: isolate_(isolate), received_signal_(received_signal) {
Mutex::ScopedLock lock(SigintWatchdogHelper::GetInstanceActionMutex());
// Register this watchdog with the global SIGINT/Ctrl+C listener.
SigintWatchdogHelper::GetInstance()->Register(this);
// Start the helper thread, if that has not already happened.
@ -110,6 +111,7 @@ SigintWatchdog::SigintWatchdog(
SigintWatchdog::~SigintWatchdog() {
Mutex::ScopedLock lock(SigintWatchdogHelper::GetInstanceActionMutex());
SigintWatchdogHelper::GetInstance()->Unregister(this);
SigintWatchdogHelper::GetInstance()->Stop();
}
@ -144,6 +146,7 @@ void TraceSigintWatchdog::New(const FunctionCallbackInfo<Value>& args) {
void TraceSigintWatchdog::Start(const FunctionCallbackInfo<Value>& args) {
TraceSigintWatchdog* watchdog;
ASSIGN_OR_RETURN_UNWRAP(&watchdog, args.Holder());
Mutex::ScopedLock lock(SigintWatchdogHelper::GetInstanceActionMutex());
// Register this watchdog with the global SIGINT/Ctrl+C listener.
SigintWatchdogHelper::GetInstance()->Register(watchdog);
// Start the helper thread, if that has not already happened.
@ -154,6 +157,7 @@ void TraceSigintWatchdog::Start(const FunctionCallbackInfo<Value>& args) {
void TraceSigintWatchdog::Stop(const FunctionCallbackInfo<Value>& args) {
TraceSigintWatchdog* watchdog;
ASSIGN_OR_RETURN_UNWRAP(&watchdog, args.Holder());
Mutex::ScopedLock lock(SigintWatchdogHelper::GetInstanceActionMutex());
SigintWatchdogHelper::GetInstance()->Unregister(watchdog);
SigintWatchdogHelper::GetInstance()->Stop();
}
@ -215,6 +219,7 @@ void TraceSigintWatchdog::HandleInterrupt() {
signal_flag_ = SignalFlags::None;
interrupting = false;
Mutex::ScopedLock lock(SigintWatchdogHelper::GetInstanceActionMutex());
SigintWatchdogHelper::GetInstance()->Unregister(this);
SigintWatchdogHelper::GetInstance()->Stop();
raise(SIGINT);
@ -413,6 +418,7 @@ SigintWatchdogHelper::~SigintWatchdogHelper() {
}
SigintWatchdogHelper SigintWatchdogHelper::instance;
Mutex SigintWatchdogHelper::instance_action_mutex_;
namespace watchdog {
static void Initialize(Local<Object> target,

2
src/node_watchdog.h
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@ -110,6 +110,7 @@ class TraceSigintWatchdog : public HandleWrap, public SigintWatchdogBase {
class SigintWatchdogHelper {
public:
static SigintWatchdogHelper* GetInstance() { return &instance; }
static Mutex& GetInstanceActionMutex() { return instance_action_mutex_; }
void Register(SigintWatchdogBase* watchdog);
void Unregister(SigintWatchdogBase* watchdog);
bool HasPendingSignal();
@ -123,6 +124,7 @@ class SigintWatchdogHelper {
static bool InformWatchdogsAboutSignal();
static SigintWatchdogHelper instance;
static Mutex instance_action_mutex_;
int start_stop_count_;

22
test/parallel/test-vm-break-on-sigint.js Normal file
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@ -0,0 +1,22 @@
'use strict';
const common = require('../common');
// This test ensures that running vm with breakOnSignt option in multiple
// worker_threads does not crash.
// Issue: https://github.com/nodejs/node/issues/43699
const { Worker } = require('worker_threads');
const vm = require('vm');
// Don't use isMainThread to allow running this test inside a worker.
if (!process.env.HAS_STARTED_WORKER) {
process.env.HAS_STARTED_WORKER = 1;
for (let i = 0; i < 10; i++) {
const worker = new Worker(__filename);
worker.on('exit', common.mustCall());
}
} else {
const ctx = vm.createContext({});
for (let i = 0; i < 10000; i++) {
vm.runInContext('console.log(1)', ctx, { breakOnSigint: true });
}
}