node-segfault-handler

A C++ Node.js module that helps gathering informations on segmentation fault

Supported Platforms

Installation

sudo apt install pkg-config libunwind-dev

npm install node-segfault-handler

Requirements

The library libunwind-dev is optionnal, if not present on your system the library node-segfault-handler will still compile but you wont have have the native stacktraces printed when a segfault occurs, you will only see the javascript stacktraces from V8.

The package node-segfault-handler relies on pkg-config to detect if libunwind-dev is installed, if pkg-config is not present on your system node-segfault-handler will still compile but you wont have have the native stacktraces printed when a segfault occurs, you will only see the javascript stacktraces from V8.

Compilation

On Linux / MacOS you need to have GCC or Clang installed

On Windows you need to have either MSVC or MinGW installed

Platform Specifications

Linux & Linux Alpine

If the library libunwind-dev is installed on your system, the library node-segfault-handler will be compiled with it and the native stacktraces will be printed when a segfault occurs.

In all cases, if the library libunwind-dev is installed or not, you will still have the Javascript Stacktraces from V8 printed.

Other

Native Stacktraces are always disabled on other OS than Linux, but you will still have the Javascript Stacktraces from V8 printed.

Usage

let segfaultHandler = require('node-segfault-handler');

/**
 * Once a segfault occurs, 
 * stacktraces from V8 and native stacktraces will be printed to the STDERR or you can provide a path to write to.
 * 
 * @param path File path, if null write to stderr
 */ 
segfaultHandler.registerHandler(path: string?);

// Simulate a segfault from a native module
segfaultHandler.segfault();

Example

let segfaultHandler = require('node-segfault-handler');

function foo() {
  bar();
}

function bar() {
  segfaultHandler.segfault();
}

function main() {
  segfaultHandler.registerHandler();
  foo();
}

main();

=========== Caught a Segmentation Fault [pid=14435] ===========
-----[ Native Stacktraces ]-----
[pc=0x00007f17bffff7bf, sp=0x00007ffdf48ba120] in segfault_handler(int)+0x4f
[pc=0x00007f17bfad7210, sp=0x00007ffdf48ba140] in killpg+0x40
[pc=0x00007f17bffff844, sp=0x00007ffdf48ba6f8] in Segfault(Nan::FunctionCallbackInfo<v8::Value> const&)+0x4
[pc=0x00007f17bffff90c, sp=0x00007ffdf48ba700] in Nan::imp::FunctionCallbackWrapper(v8::FunctionCallbackInfo<v8::Value> const&)+0xac
[pc=0x0000000000c065f9, sp=0x00007ffdf48ba760] in v8::internal::MaybeHandle<v8::internal::Object> v8::internal::(anonymous namespace)::HandleApiCallHelper<false>(v8::internal::Isolate*, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::FunctionTemplateInfo>, v8::internal::Handle<v8::internal::Object>, v8::internal::BuiltinArguments)+0x1c9
[pc=0x0000000000c083e7, sp=0x00007ffdf48ba8a0] in v8::internal::Builtin_HandleApiCall(int, unsigned long*, v8::internal::Isolate*)+0xb7
[pc=0x000000000140df99, sp=0x00007ffdf48ba920] in Builtins_CEntry_Return1_DontSaveFPRegs_ArgvOnStack_BuiltinExit+0x39
[pc=0x0000000001393724, sp=0x00007ffdf48ba930] in Builtins_InterpreterEntryTrampoline+0x2a4
[pc=0x0000000001393724, sp=0x00007ffdf48ba940] in Builtins_InterpreterEntryTrampoline+0x2a4
[pc=0x0000000001393724, sp=0x00007ffdf48ba950] in Builtins_InterpreterEntryTrampoline+0x2a4
[pc=0x0000000001393724, sp=0x00007ffdf48ba960] in Builtins_InterpreterEntryTrampoline+0x2a4
[pc=0x0000000001393724, sp=0x00007ffdf48ba970] in Builtins_InterpreterEntryTrampoline+0x2a4
[pc=0x0000000001393724, sp=0x00007ffdf48ba980] in Builtins_InterpreterEntryTrampoline+0x2a4
[pc=0x0000000001393724, sp=0x00007ffdf48ba990] in Builtins_InterpreterEntryTrampoline+0x2a4
[pc=0x0000000001393724, sp=0x00007ffdf48ba9a0] in Builtins_InterpreterEntryTrampoline+0x2a4
[pc=0x0000000001393724, sp=0x00007ffdf48ba9b0] in Builtins_InterpreterEntryTrampoline+0x2a4
[pc=0x0000000001393724, sp=0x00007ffdf48ba9c0] in Builtins_InterpreterEntryTrampoline+0x2a4
[pc=0x0000000001390c9d, sp=0x00007ffdf48ba9d0] in Builtins_JSEntryTrampoline+0x5d
[pc=0x0000000001390a78, sp=0x00007ffdf48ba9e0] in Builtins_JSEntry+0x78
[pc=0x0000000000ceca30, sp=0x00007ffdf48ba9f0] in v8::internal::(anonymous namespace)::Invoke(v8::internal::Isolate*, v8::internal::(anonymous namespace)::InvokeParams const&)+0x1b0
[pc=0x0000000000cecee8, sp=0x00007ffdf48bb000] in v8::internal::Execution::Call(v8::internal::Isolate*, v8::internal::Handle<v8::internal::Object>, v8::internal::Handle<v8::internal::Object>, int, v8::internal::Handle<v8::internal::Object>*)+0x58
[pc=0x0000000000bac32b, sp=0x00007ffdf48bb090] in v8::Function::Call(v8::Local<v8::Context>, v8::Local<v8::Value>, int, v8::Local<v8::Value>*)+0x16b
[pc=0x00000000009e6e41, sp=0x00007ffdf48bb1c0] in node::ExecuteBootstrapper(node::Environment*, char const*, std::vector<v8::Local<v8::String>, std::allocator<v8::Local<v8::String> > >*, std::vector<v8::Local<v8::Value>, std::allocator<v8::Local<v8::Value> > >*)+0x71
[pc=0x00000000009e7156, sp=0x00007ffdf48bb240] in node::StartExecution(node::Environment*, char const*)+0x216
[pc=0x00000000009e8518, sp=0x00007ffdf48bb310] in node::StartExecution(node::Environment*, std::function<v8::MaybeLocal<v8::Value> (node::StartExecutionCallbackInfo const&)>)+0x568
[pc=0x0000000000988f01, sp=0x00007ffdf48bb3a0] in node::LoadEnvironment(node::Environment*)+0x61
[pc=0x0000000000a5d704, sp=0x00007ffdf48bb400] in node::NodeMainInstance::Run()+0x154
[pc=0x00000000009eab6c, sp=0x00007ffdf48bb520] in node::Start(int, char**)+0x2ac
[pc=0x00007f17bfab80b3, sp=0x00007ffdf48bb6a0] in __libc_start_main+0xf3
[pc=0x0000000000981fe5, sp=0x00007ffdf48bb770] in _start+0x29

---[ V8 JavaScript Stacktraces ]---
at bar (/home/shiranuit/node-segfault-handler/tests/test.js:8:19)
at foo (/home/shiranuit/node-segfault-handler/tests/test.js:4:3)
at main (/home/shiranuit/node-segfault-handler/tests/test.js:13:3)
at (null) (/home/shiranuit/node-segfault-handler/tests/test.js:16:1)
at Module._compile (internal/modules/cjs/loader.js:999:30)
at Module._extensions..js (internal/modules/cjs/loader.js:1027:10)
at Module.load (internal/modules/cjs/loader.js:863:32)
at Module._load (internal/modules/cjs/loader.js:708:14)
at executeUserEntryPoint (internal/modules/run_main.js:60:12)
at (null) (internal/main/run_main_module.js:17:47)
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