[v8-users] Getting Segmentation Fault on hello_world after changing the javascript that gets run

[Mark P]

Hi All, 
Just started investigating using V8 in my application.
I have the hello world demo built and running (I have 
added V8::Initialize();).

I changed the code getting run from "'Hello' + ', World!'" to "(new 
Array(1024*1024)).join('x');" and it now SegFaults.

Running it in ddd shows:

Program received signal SIGSEGV, Segmentation fault.
0x00000000005194db in 
v8::internal::MarkCompactCollector::StartSweeperThreads() ()


Stack Trace:

#1  0x0000000000523448 in v8::internal::MarkCompactCollector::SweepSpaces() 
()
#2  0x0000000000528399 in 
v8::internal::MarkCompactCollector::CollectGarbage() ()
#3  0x00000000004ea2fb in v8::internal::Heap::MarkCompact() ()
#4  0x00000000004f955d in 
v8::internal::Heap::PerformGarbageCollection(v8::internal::GarbageCollector, 
v8::GCCallbackFlags) ()
#5  0x00000000004f9a27 in 
v8::internal::Heap::CollectGarbage(v8::internal::GarbageCollector, char 
const*, char const*, v8::GCCallbackFlags) ()
#6  0x00000000004f9c6f in v8::internal::Heap::CollectAllGarbage(int, char 
const*, v8::GCCallbackFlags) ()
#7  0x000000000049bd15 in v8::internal::StackGuard::HandleInterrupts() ()
#8  0x00000000007c21a4 in v8::internal::Runtime_StackGuard(int, 
v8::internal::Object**, v8::internal::Isolate*) ()
#9  0x00001acf3bc0843b in ?? ()
#10 0x00001acf3bc08381 in ?? ()
#11 0x00007fffffffd590 in ?? ()




I have attached 'hello.cpp' which I build using the command:

g++ -Iinclude hello.cpp -o hello -Wl,--start-group 
out/native/obj.target/{tools/gyp/libv8_{base,libbase,snapshot},third_party/icu/libicu{uc,i18n,data}}.a
 
-Wl,--end-group -lrt -lpthread -g

This is from within the root of the v8 directory.

I built the v8 library using 'make native' from the master branch of 
https://chromium.googlesource.com/external/v8.git


Environment:
gcc -v: gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)
uname -a: Linux XXXX 3.13.0-37-generic #64-Ubuntu SMP Mon Sep 22 21:28:38 
UTC 2014 x86_64 x86_64 x86_64 GNU/Linux


Any pointers on what I'm doing wrong would be appreciated.

Thanks,

Mark

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#include <v8.h>

using namespace v8;

int main(int argc, char* argv[]) {
  V8::Initialize();
  // Create a new Isolate and make it the current one.
  Isolate* isolate = Isolate::New();
  Isolate::Scope isolate_scope(isolate);

  // Create a stack-allocated handle scope.
  HandleScope handle_scope(isolate);

  // Create a new context.
  Local<Context> context = Context::New(isolate);

  // Enter the context for compiling and running the hello world script.
  Context::Scope context_scope(context);

  
  // Create a string containing the JavaScript source code.
  Local<String> source = String::NewFromUtf8(isolate, "(new Array(1024*1024)).join('x');");

  // Compile the source code.
  Local<Script> script = Script::Compile(source);

  printf("calling Script\n");
  // Run the script to get the result.
  Local<Value> result = script->Run();
  printf("called Script\n");

  // Convert the result to an UTF8 string and print it.
  String::Utf8Value utf8(result);
  printf("%d\n", utf8.length());
  return 0;
}