C++ -分段故障。- malloc.c:没有这样的文件或目录
C++ -分段故障。- malloc.c:没有这样的文件或目录
提问于 2020-09-25 01:26:09
下面是我的GDB Stacktrace：
Program received signal SIGSEGV, Segmentation fault.
__GI___libc_free (mem=0x4645444342414746) at malloc.c:3102
3102 malloc.c: No such file or directory.
(gdb) bt
#0 __GI___libc_free (mem=0x4645444342414746) at malloc.c:3102
#1 0x00005555555b7e22 in __gnu_cxx::new_allocator<char>::deallocate (this=0x55555562d0c0, __p=0x4645444342414746 <error: Cannot access memory at address 0x4645444342414746>) at /usr/include/c++/9/ext/new_allocator.h:128
#2 0x00005555555b51ec in std::allocator_traits<std::allocator<char> >::deallocate (__a=..., __p=0x4645444342414746 <error: Cannot access memory at address 0x4645444342414746>, __n=18087021261120207611) at /usr/include/c++/9/bits/alloc_traits.h:470
#3 0x00007ffff7f93a72 in std::_Vector_base<char, std::allocator<char> >::_M_deallocate (this=0x55555562d0c0, __p=0x4645444342414746 <error: Cannot access memory at address 0x4645444342414746>, __n=18087021261120207611) at /usr/include/c++/9/bits/stl_vector.h:351
#4 0x00007ffff7f9275a in std::_Vector_base<char, std::allocator<char> >::~_Vector_base (this=0x55555562d0c0, __in_chrg=<optimized out>) at /usr/include/c++/9/bits/stl_vector.h:332
#5 0x00007ffff7f9175f in std::vector<char, std::allocator<char> >::~vector (this=0x55555562d0c0 = {...}, __in_chrg=<optimized out>) at /usr/include/c++/9/bits/stl_vector.h:680
#6 0x00007ffff7f97282 in boost::asio::basic_streambuf<std::allocator<char> >::~basic_streambuf (this=0x55555562d078, __in_chrg=<optimized out>) at /usr/include/boost/asio/basic_streambuf.hpp:111
#7 0x00007ffff7f90652 in Packet::~Packet (this=0x55555562d068, __in_chrg=<optimized out>) at /home/armegon/Vibranium-Core/Source/Common/Server/Packet.h:16
#8 0x00007ffff7f9816c in Vibranium::Client::~Client (this=0x55555562d020, __in_chrg=<optimized out>) at /home/armegon/Vibranium-Core/Source/Common/Server/Client.h:19
#9 0x00007ffff7f981ac in __gnu_cxx::new_allocator<Vibranium::Client>::destroy<Vibranium::Client> (this=0x55555562d020, __p=0x55555562d020) at /usr/include/c++/9/ext/new_allocator.h:153
#10 0x00007ffff7f97c05 in std::allocator_traits<std::allocator<Vibranium::Client> >::destroy<Vibranium::Client> (__a=..., __p=0x55555562d020) at /usr/include/c++/9/bits/alloc_traits.h:497
#11 0x00007ffff7f9745b in std::_Sp_counted_ptr_inplace<Vibranium::Client, std::allocator<Vibranium::Client>, (__gnu_cxx::_Lock_policy)2>::_M_dispose (this=0x55555562d010) at /usr/include/c++/9/bits/shared_ptr_base.h:557
#12 0x00005555555b373c in std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release (this=0x55555562d010) at /usr/include/c++/9/bits/shared_ptr_base.h:155
#13 0x00005555555b1575 in std::__shared_count<(__gnu_cxx::_Lock_policy)2>::~__shared_count (this=0x7fffffffdfe8, __in_chrg=<optimized out>) at /usr/include/c++/9/bits/shared_ptr_base.h:730
#14 0x00007ffff7f90706 in std::__shared_ptr<Vibranium::Client, (__gnu_cxx::_Lock_policy)2>::~__shared_ptr (this=0x7fffffffdfe0, __in_chrg=<optimized out>) at /usr/include/c++/9/bits/shared_ptr_base.h:1169
#15 0x00007ffff7f90726 in std::shared_ptr<Vibranium::Client>::~shared_ptr (this=0x7fffffffdfe0 = {...}, __in_chrg=<optimized out>) at /usr/include/c++/9/bits/shared_ptr.h:103
#16 0x00007ffff7f98e6e in Vibranium::Client::<lambda(boost::system::error_code, std::size_t)>::~<lambda>(void) (this=0x7fffffffdfd8, __in_chrg=<optimized out>) at /home/armegon/Vibranium-Core/Source/Common/Server/Client.cpp:35
#17 0x00007ffff7f997f2 in boost::asio::detail::read_op<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::executor>, boost::asio::mutable_buffers_1, const boost::asio::mutable_buffer*, boost::asio::detail::transfer_all_t, Vibranium::Client::read_size()::<lambda(boost::system::error_code, std::size_t)> >::~read_op(void) (this=0x7fffffffdfb0, __in_chrg=<optimized out>) at /usr/include/boost/asio/impl/read.hpp:317
#18 0x00007ffff7f9aa38 in boost::asio::detail::binder2<boost::asio::detail::read_op<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::executor>, boost::asio::mutable_buffers_1, const boost::asio::mutable_buffer*, boost::asio::detail::transfer_all_t, Vibranium::Client::read_size()::<lambda(boost::system::error_code, std::size_t)> >, boost::system::error_code, long unsigned int>::~binder2(void) (this=0x7fffffffdfb0, __in_chrg=<optimized out>) at /usr/include/boost/asio/detail/bind_handler.hpp:127
#19 0x00007ffff7f9ab87 in boost::asio::detail::reactive_socket_recv_op<boost::asio::mutable_buffers_1, boost::asio::detail::read_op<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::executor>, boost::asio::mutable_buffers_1, const boost::asio::mutable_buffer*, boost::asio::detail::transfer_all_t, Vibranium::Client::read_size()::<lambda(boost::system::error_code, std::size_t)> >, boost::asio::detail::io_object_executor<boost::asio::executor> >::do_complete(void *, boost::asio::detail::operation *, const boost::system::error_code &, std::size_t) (owner=0x55555563e380, base=0x555555631a60) at /usr/include/boost/asio/detail/reactive_socket_recv_op.hpp:114
#20 0x00005555555aa984 in boost::asio::detail::scheduler_operation::complete (this=0x555555631a60, owner=0x55555563e380, ec=..., bytes_transferred=0) at /usr/include/boost/asio/detail/scheduler_operation.hpp:40
#21 0x00005555555af30e in boost::asio::detail::scheduler::do_run_one (this=0x55555563e380, lock=..., this_thread=..., ec=...) at /usr/include/boost/asio/detail/impl/scheduler.ipp:447
#22 0x00005555555aed1a in boost::asio::detail::scheduler::run (this=0x55555563e380, ec=...) at /usr/include/boost/asio/detail/impl/scheduler.ipp:200
#23 0x00005555555af86c in boost::asio::io_context::run (this=0x7fffffffe1f0) at /usr/include/boost/asio/impl/io_context.ipp:63
#24 0x00005555555a7795 in main () at /home/armegon/Vibranium-Core/Source/Core/AuthServer/AuthServer.cpp:34
#25 0x00007ffff74cd0b3 in __libc_start_main (main=0x5555555a74e8 <main()>, argc=1, argv=0x7fffffffe518, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe508) at ../csu/libc-start.c:308
#26 0x00005555555a740e in _start ()这里我只提供堆栈跟踪中提到的代码：
Packet.h
class Packet { //Packet.h 16
public:
Packet()
{
}
static const int header_size_in_bytes = 4;
uint8_t size[header_size_in_bytes] = {0};
size_t body_size{0};
boost::asio::streambuf body_;
void PreparePacket(ServerOpcode serverOpcode, std::string message);
};
#endif //VIBRANIUM_CORE_PACKET_HPacket.cpp
void Packet::PreparePacket(ServerOpcode serverOpcode, std::string message) {
}Client.h
using boost::asio::ip::tcp;
namespace Vibranium{
class Client: public std::enable_shared_from_this<Client> // Client.h 19
{
public:
Client(tcp::socket socket)
: socket(std::move(socket))
{
}
void start();
int connectionId;
tcp::socket socket;
void Send(ServerOpcode serverOpcode, const std::string& message);
void Disconnect() const;
private:
void read_size();
void read_message();
Packet _packet;
};
}
#endif //VIBRANIUM_CORE_CLIENT_HClient.cpp
using namespace Vibranium;
void Vibranium::Client::start() {
read_size();
}
void Vibranium::Client::Send(ServerOpcode serverOpcode, const std::string& message) {
}
void Vibranium::Client::read_size() {
auto self(shared_from_this());
boost::asio::async_read(socket,
boost::asio::buffer(&_packet.size, _packet.header_size_in_bytes),
[this, self](boost::system::error_code ec,std::size_t bytes_transferred) //Client.cpp 35
{
if ((boost::asio::error::eof == ec) || (boost::asio::error::connection_reset == ec))
{
Disconnect();
}
else
{
_packet.body_size = static_cast<int>(_packet.size[0]);
read_message();
}
});
}
void Vibranium::Client::read_message() {
auto self(shared_from_this());
_packet.body_.prepare(_packet.body_size);
boost::asio::async_read(socket,
boost::asio::buffer(&_packet.body_, _packet.body_size),
[this, self](boost::system::error_code ec,std::size_t bytes_transferred)
{
if ((boost::asio::error::eof == ec) || (boost::asio::error::connection_reset == ec))
{
Disconnect();
}
else
{
const char *HEADER = "ABVG";
const char* buffIdentifier = flatbuffers::GetBufferIdentifier(&_packet.body_);
bool hasIdentifier = flatbuffers::BufferHasIdentifier(&_packet.body_,HEADER);
std::cout << "Builder Identifier" << buffIdentifier << std::endl;
std::cout << "Builder Has Identifier" << hasIdentifier << std::endl;
auto ac = GetAccountRole_Packet(&_packet.body_);
std::cout << "ID" << ac->id() << std::endl;
std::cout << "NAME:" << ac->name()->c_str() << std::endl;
read_size();
}
});
}
void Vibranium::Client::Disconnect() const {
Logger::Log("Disconnected ID: " + std::__cxx11::to_string(this->connectionId), Logger::Error, true);
for (int i = 0; i < Vibranium::Server::Clients.size(); ++i) {
if(Vibranium::Server::Clients[i]->connectionId == this->connectionId)
Vibranium::Server::Clients.erase(Vibranium::Server::Clients.begin() + i);
}
}AuthServer.cpp
#include "Config.h"
#include "Database/MySQLConnection.h"
#include "Implementation/LoginDatabase.h"
#include "Banner.h"
#include "Server/Server.h"
#include <boost/asio.hpp>
using boost::asio::ip::tcp;
using namespace std;
using namespace Vibranium;
int main() {
//Don't mind Logger::FatalError it's just for coloring!
Banner::Show(Logger::Error,"AuthServer");
Config config("AuthServer");
std::string defaultPort = "8080";
MySQLConnectionInfo mySqlConnectionInfo(config, "LoginDatabaseInfo");
LoginDatabaseConnection loginDatabaseConnection(mySqlConnectionInfo);
loginDatabaseConnection.LoadDatabase();
try
{
boost::asio::io_service io_service;
Server s(io_service, std::stoi(config.GetConfigValue("AuthServerPort", defaultPort)));
io_service.run(); // <---- LINE 34 is HERE
}
catch (std::exception& e)
{
std::cerr << "Exception: " << e.what() << "\n";
}
return 0;
}我对C++和GDB还是个新手。我想知道是什么导致了这次坠机。我的错误在哪里?我如何才能纠正它？
附注。这可能很重要，所以我添加了如何向服务器发送消息以及崩溃发生的原因：
flatbuffers::FlatBufferBuilder builder;
std::string str = "ABCDEFGABCDEFGABCDEFGABCDEFGABCDEFG I AM HERE!";
auto name = builder.CreateString(str);
auto accountRole = Vibranium::CreateAccountRole_Packet(builder,5,name);
const char *HEADER = "ABVG";
builder.FinishSizePrefixed(accountRole, HEADER);
size_t size = builder.GetSize();
uint8_t *buf = builder.GetBufferPointer();
const char* buffIdentifier = flatbuffers::GetBufferIdentifier(buf,true);
const uint8_t prefixSize = flatbuffers::GetPrefixedSize(buf);
bool hasIdentifier = flatbuffers::BufferHasIdentifier(buf,HEADER);
boost::asio::write(s, boost::asio::buffer(buf,size));收到消息时的服务器输出：
Builder IdentifierABV
Builder Has Identifier1
ID5
NAME:ABCDEFGABCDEFGABCDEFGABCDEFGABCDEFG I AM HERE!看看Builder IdentifierABV，它确实缩短了它的长度。必须是Builder IdentifierABVG <--
回答 2
Stack Overflow用户
发布于 2020-09-25 02:37:26
根据@user4581301和@john的建议，我做了一些更改以使其正常工作。
我改变了：
boost::asio::streambuf body_;至：
std::vector<size_t>* body_;read_message()看起来像这样：
void Vibranium::Client::read_message() {
auto self(shared_from_this());
(*_packet.body_).resize(_packet.body_size);
boost::asio::async_read(socket,
boost::asio::buffer(&_packet.body_, _packet.body_size),
[this, self](boost::system::error_code ec,std::size_t bytes_transferred)
{
if ((boost::asio::error::eof == ec) || (boost::asio::error::connection_reset == ec))
{
Disconnect();
}
else
{
const char *HEADER = "ABVG";
const char* buffIdentifier = flatbuffers::GetBufferIdentifier(&_packet.body_);
bool hasIdentifier = flatbuffers::BufferHasIdentifier(&_packet.body_,HEADER);
std::cout << "Builder Identifier" << buffIdentifier << std::endl;
std::cout << "Builder Has Identifier" << hasIdentifier << std::endl;
auto ac = GetAccountRole_Packet(&_packet.body_);
std::cout << "ID" << ac->id() << std::endl;
std::cout << "NAME:" << ac->name()->c_str() << std::endl;
read_size();
}
});
}Stack Overflow用户
发布于 2020-09-28 22:30:39
boost::asio::streambuf body_;Body不是POD或此类对象的连续数组。因此，asio::buffer(&body_, ...)是非法的(调用UB)。
只需按照给定的方式使用body_ (在复合操作中接受，如boost::asio::async_read：https://www.boost.org/doc/libs/1_74_0/doc/html/boost_asio/reference/async_read.html)。
当然，您可以使用另一种缓冲区类型，但不需要像您自己回答的那样使用额外的动态分配级别：
std::vector<size_t> body_;
// ...
body_resize(XXX);
// ...
asio::buffer(body_),页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/64051465
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