google v8 New failed in linux shared library raise "segment error" - c++

Question

I have a problem using Google V8 in linux. If I create a V8 instance in my shared library, I get a segfault. The same code works fine in a Windows DLL and in a linux executable.
My code:
extern "C" void InitV8ExtensionInterFace(){
v8::V8::InitializeICU();
v8::V8::Initialize();
v8::Isolate* isolate = v8::Isolate::New(); **//error occur**
threadfunc(argc, args);
}
gdb stack trace:
#0 0x0000000000000000 in ?? ()
#1 0x00007ffff3cb86d5 in v8::internal::Builtins::SetUp (this=0x7fffffffb9e0, isolate=0x235abb0, create_heap_objects=false) at ../src/builtins.cc:1567
#2 0x00007ffff3e271cf in v8::internal::Isolate::Init (this=0x235abb0, des=0x0) at ../src/isolate.cc:2115
#3 0x00007ffff3c96049 in v8::Isolate::New (params=...) at ../src/api.cc:6861
#4 0x00007ffff3b78d40 in InitV8ExtensionInterFace () at ../Framework/ExPublic.cpp:107
#5 0x00000000004729db in myTest1 () at arangod/RestServer/arangod.cpp:106
#6 0x0000000000472a50 in main (argc=1, argv=0x7fffffffe118) at arangod/RestServer/arangod.cpp:126
It appears that in the V8 function void Builtins::SetUp(Isolate* isolate, bool create_heap_objects), the array functions is empty. If I initialize v8::Platform, the error will occur in code V8::InitializePlatform(platform):
extern "C" void InitV8ExtensionInterFace(){
v8::V8::InitializeICU();
v8::Platform* platform = v8::platform::CreateDefaultPlatform();
v8::V8::InitializePlatform(platform); **//error occur**
v8::V8::Initialize();
v8::Isolate* isolate = v8::Isolate::New();
threadfunc(argc, args);
}
gdb stack trace:
1: V8_Fatal
2: v8::internal::V8::InitializePlatform(v8::Platform*)
3: InitV8ExtensionInterFace
4: 0x4aab60
5: 0x4aacf1
6: 0x5f4532
7: 0x47c32b
8: 0x474498
9: 0x472ae1
10: __libc_start_main
11: 0x4726f9
Thread 1 received signal SIGABRT, Aborted.
0x00007ffff66595e5 in raise () from /lib64/libc.so.6
(gdb) where
#0 0x00007ffff66595e5 in raise () from /lib64/libc.so.6
#1 0x00007ffff665adc5 in abort () from /lib64/libc.so.6
#2 0x00007fffc6e7d9c9 in v8::base::OS::Abort () at ../src/base/platform/platform-posix.cc:233
#3 0x00007fffc6e7b586 in V8_Fatal (file=0x7fffc703f535 "../src/v8.cc", line=107, format=0x7fffc6ffe77a "Check failed: %s.") at ../src/base/logging.cc:116
#4 0x00007fffc6cbd909 in v8::internal::V8::InitializePlatform (platform=0x267d840) at ../src/v8.cc:107
#5 0x00007fffc690bc8b in InitV8ExtensionInterFace () at ../Framework/ExPublic.cpp:98
#6 0x00000000004aab60 in myTest () at arangod/V8Server/ApplicationV8.cpp:1068
#7 0x00000000004aacf1 in triagens::arango::ApplicationV8::prepare2 (this=0x2378310) at arangod/V8Server/ApplicationV8.cpp:1093
#8 0x00000000005f4532 in triagens::rest::ApplicationServer::prepare2 (this=0x2377000) at arangod/ApplicationServer/ApplicationServer.cpp:525
#9 0x000000000047c32b in triagens::arango::ArangoServer::startupServer (this=0x2375330) at arangod/RestServer/ArangoServer.cpp:1009
#10 0x0000000000474498 in triagens::rest::AnyServer::start (this=0x2375330) at arangod/Rest/AnyServer.cpp:347
#11 0x0000000000472ae1 in main (argc=1, argv=0x7fffffffe118) at arangod/RestServer/arangod.cpp:139
I get "4.3.61" at runtime with v8::V8::GetVersion.
This problem has troubled me for several days, Very much hope that someone will give me help, thank you.

Answer 1

You're missing a call to V8::InitializeExternalStartupData(), see the Get Started tutorials.
int main(int argc, char* argv[])
{
// Initialize V8.
V8::InitializeICU();
V8::InitializeExternalStartupData(argv[0]);
Platform* platform = platform::CreateDefaultPlatform();
V8::InitializePlatform(platform);
V8::Initialize();
// ...
}
You will need to copy natives_blob.bin and snapshot_blob.bin alongside your executable. They should be somewhere with the V8 binaries.
Looking at your edits with a better stack trace, you're running into two very different problems. Your first crash (the empty functions array) is because you're not calling CreateDefaultPlatform(), which is mandatory.
The second crash is inside InitializePlatform() on this line:
void V8::InitializePlatform(v8::Platform* platform) {
CHECK(!platform_); // <- here
CHECK(platform);
platform_ = platform;
}
This check is to make sure the default platform is only created once. It appears that you're calling InitializePlatform() twice. You can try putting a breakpoint in it to figure out where it gets called from.