EXC_BAD_ACCESS (code=1, address=0x8) while trying to insert to postgresql

[ericjansen]

Hi,

I'd need your enlightenment on how to solve an issue of EXC_BAD_ACCESS when inserting a simple query to an account in postgresql.
The database setup like this:
postgres=# \d accounts Table "public.accounts" Column | Type | Collation | Nullable | Default ------------+-----------------------------+-----------+----------+------------------------------------------- user_id | integer | | not null | nextval('accounts_user_id_seq'::regclass) username | character varying(100) | | not null | password | character varying(200) | | not null | email | character varying(255) | | not null | created_on | timestamp without time zone | | not null | last_login | timestamp without time zone | | | Indexes: "accounts_pkey" PRIMARY KEY, btree (user_id) "accounts_email_key" UNIQUE CONSTRAINT, btree (email) "accounts_username_key" UNIQUE CONSTRAINT, btree (username)

my method of calling in controller:
`void Auth::newUser(const HttpRequestPtr &request, std::function<void(const HttpResponsePtr &)> &&callback)
{
Json::Value accData;
std::stringstream(request->bodyData()) >> accData;
auto acc = Accounts(accData);

auto dbClient = drogon::app().getDbClient();
auto accMapper = drogon::orm::Mapper<Accounts>(dbClient);

std::promise<Json::Value> accPromise;
auto accFuture = accPromise.get_future();
accMapper.insert(
    acc,
    [&](const Accounts &a) { 
        accPromise.set_value(a.toJson());
    },
    [&](const drogon::orm::DrogonDbException &e)
    {
        accPromise.set_exception(std::make_exception_ptr(e.base()));
    });
accFuture.wait();

callback(HttpResponse::newHttpJsonResponse(accFuture.get()));

}`

in the header of controller looks like this:
METHOD_ADD(Auth::newUser, "/user", Post);
.....
auto newUser(const HttpRequestPtr &request, std::function<void(const HttpResponsePtr &)> &&callback) -> void;

The debug from lldb shows this in backtrace:
`(lldb) bt

• thread Cache response #2, stop reason = EXC_BAD_ACCESS (code=1, address=0x8)
  • frame #0: 0x00000001001ba794 jansen.aidrogon::orm::DbClient::operator<<(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>&&) + 20 frame #1: 0x0000000100029ed0 jansen.aidrogon::orm::Mapper<drogon_model::postgres::Accounts>::insert(this=0x0000700009b8bec0, obj=0x0000700009b8bf28, rcb=0x0000700009b8c140, ecb=0x0000700009b8c110) at Mapper.h:1233:28
    frame Cache response #2: 0x00000001000298f5 jansen.aiapi::jai::Auth::newUser(this=0x00007fbf84308688, request=std::__1::shared_ptr<drogon::HttpRequest>::element_type @ 0x00007fbf84804d70 strong=6 weak=1, callback=0x0000700009b8d250) at Auth.cc:52:15 frame #3: 0x000000010005059f jansen.aistd::__1::enable_if<true && true && true, void>::type drogon::internal::HttpBinder<void (api::jai::Auth::)(std::__1::shared_ptrdrogon::HttpRequest const&, std::__1::function<void (std::__1::shared_ptrdrogon::HttpResponse const&)>&&)>::callFunction<std::__1::function<void (std::__1::shared_ptrdrogon::HttpResponse const&)>&, true, true, true>(this=0x00007fbf84305188, req=std::__1::shared_ptrdrogon::HttpRequest::element_type @ 0x00007fbf84804d70 strong=6 weak=1, values=0x0000700009b8d250) at HttpBinder.h:407:16
    frame Remove boost any #4: 0x000000010004ebd5 jansen.aistd::__1::enable_if<sizeof...() == 0ul && !false, void>::type drogon::internal::HttpBinder<void (api::jai::Auth::*)(std::__1::shared_ptr<drogon::HttpRequest> const&, std::__1::function<void (std::__1::shared_ptr<drogon::HttpResponse> const&)>&&)>::run<0ul, false>(this=0x00007fbf84305188, (null)=size=0, req=std::__1::shared_ptr<drogon::HttpRequest>::element_type @ 0x00007fbf84804d70 strong=6 weak=1, callback=0x0000700009b8d420) at HttpBinder.h:322:13 frame #5: 0x000000010004e6b9 jansen.aidrogon::internal::HttpBinder<void (api::jai::Auth::)(std::__1::shared_ptrdrogon::HttpRequest const&, std::__1::function<void (std::__1::shared_ptrdrogon::HttpResponse const&)>&&)>::handleHttpRequest(this=0x00007fbf84305188, pathArguments=size=0, req=std::__1::shared_ptrdrogon::HttpRequest::element_type @ 0x00007fbf84804d70 strong=6 weak=1, callback=0x0000700009b8d420) at HttpBinder.h:128:9
    frame Http method #6: 0x000000010011e079 jansen.aidrogon::HttpControllersRouter::doControllerHandler(std::__1::shared_ptr<drogon::HttpControllersRouter::CtrlBinder> const&, drogon::HttpControllersRouter::HttpControllerRouterItem const&, std::__1::shared_ptr<drogon::HttpRequestImpl> const&, std::__1::match_results<std::__1::__wrap_iter<char const*>, std::__1::allocator<std::__1::sub_match<std::__1::__wrap_iter<char const*>>>> const&, std::__1::function<void (std::__1::shared_ptr<drogon::HttpResponse> const&)>&&) + 937 frame #7: 0x000000010011d180 jansen.aidrogon::HttpControllersRouter::doPreHandlingAdvices(std::__1::shared_ptrdrogon::HttpControllersRouter::CtrlBinder const&, drogon::HttpControllersRouter::HttpControllerRouterItem const&, std::__1::shared_ptrdrogon::HttpRequestImpl const&, std::__1::match_results<std::__1::__wrap_iter<char const*>, std::__1::allocator<std::__1::sub_match<std::__1::__wrap_iter<char const*>>>>&&, std::__1::function<void (std::__1::shared_ptrdrogon::HttpResponse const&)>&&) + 688`

Is something wrong in the way I am doing it?

Thanks.

[VladlenPopolitov]

EXC_BAD_ACCESS - your program accessed wrong memory address (address is 0x8, does not looks like correct address). It can be any error in program, usual debug situation. Try to debug step by step until error is fired. Probably, some variable is not initialized or used null pointer to class (0x8 is offset 8 of member from nullptr pointer).

[ericjansen]

Yeah you're right. I forgot to activate it in config.json. Therefore, it failed to segmentation fault. Thank you @VladlenPopolitov