I’m in the midst of improving the error handling in my code, but there’s a
warning logged by KJ that I can’t figure out. I’d appreciate any advice or
insight.
It happens when my client code fails to connect because server-side auth fails,
so it gets an abrupt "Connection reset by peer” error that’s thrown from the
first Promise::wait() call. That exception causes my client object to get
destructed, and during its destructor the warning gets logged (with a bunch of
backtrace.)
The message as logged from my onRecoverableException handler looks like:
expected head == nullptr [10bf07390 == nullptr]; EventLoop destroyed with
events still in the queue. Memory leak?; head->traceEvent() = 10152fc4c
101548a28
kj::_::ImmediatePromiseNode<kj::Own<capnp::ClientHook>
>::get(kj::_::ExceptionOrValue&) (in myapp) + 0: returning here
The call stack is pretty long, so I’ve tried to clean it up a bit. “myapp” is
app code. “snej::shs” is my implementation of the SecretHandshake secure-socket
protocol, including CapnP glue code adapted from ez-rpc.c++.
myapp::KJExceptionCallback::onRecoverableException() at Logging.cc:80:28
kj::_::Debug::Fault::~Fault() + 172
kj::EventLoop::~EventLoop() + 432
kj::_::HeapDisposer<kj::() const + 56
kj::Disposer::Dispose_<kj::LowLevelAsyncIoProvider, true>::dispose() at
memory.h:522:14
void kj::Disposer::dispose<kj::LowLevelAsyncIoProvider>() const at
memory.h:534:3
kj::Own<kj::LowLevelAsyncIoProvider>::dispose() at memory.h:278:17
kj::Own<kj::LowLevelAsyncIoProvider>::~Own() at memory.h:204:28
kj::Own<kj::LowLevelAsyncIoProvider>::~Own() at memory.h:204:26
kj::AsyncIoContext::~AsyncIoContext() at async-io.h:876:8
kj::AsyncIoContext::~AsyncIoContext() at async-io.h:876:8
snej::shs::SecretRPCContext::~SecretRPCContext() at SecretRPC.cc:56:9
snej::shs::SecretRPCContext::~SecretRPCContext() at SecretRPC.cc:50:45
snej::shs::SecretRPCContext::~SecretRPCContext() at SecretRPC.cc:50:45
kj::Disposer::Dispose_<snej::shs::SecretRPCContext, true>::dispose() at
memory.h:522:14
void kj::Disposer::dispose<snej::shs::SecretRPCContext>() const at
memory.h:534:3
kj::Own<snej::shs::SecretRPCContext>::dispose() at memory.h:278:17
kj::Own<snej::shs::SecretRPCContext>::~Own() at memory.h:204:28
kj::Own<snej::shs::SecretRPCContext>::~Own() at memory.h:204:26
snej::shs::SecretRPCClient::Impl::~Impl() at SecretRPC.cc:283:29
snej::shs::SecretRPCClient::Impl::~Impl() at SecretRPC.cc:283:29
kj::_::HeapDisposer<snej::shs::SecretRPCClient::Impl>::disposeImpl() const at
memory.h:433:60
kj::Disposer::Dispose_<snej::shs::SecretRPCClient::Impl, false>::dispose() at
memory.h:528:14
void kj::Disposer::dispose<snej::shs::SecretRPCClient::Impl>() const at
memory.h:534:3
kj::Own<snej::shs::SecretRPCClient::Impl>::dispose() at memory.h:278:17
kj::Own<snej::shs::SecretRPCClient::Impl>::~Own() at memory.h:204:28
kj::Own<snej::shs::SecretRPCClient::Impl>::~Own() at memory.h:204:26
snej::shs::SecretRPCClient::~SecretRPCClient() at SecretRPC.cc:383:59
snej::shs::SecretRPCClient::~SecretRPCClient() at SecretRPC.cc:383:57
kj::_::HeapDisposer<snej::shs::SecretRPCClient>::disposeImpl() const at
memory.h:433:60
kj::Disposer::Dispose_<snej::shs::SecretRPCClient, false>::dispose() at
memory.h:528:14
void kj::Disposer::dispose<snej::shs::SecretRPCClient>() const at memory.h:534:3
kj::Own<snej::shs::SecretRPCClient>::dispose() at memory.h:278:17
kj::Own<snej::shs::SecretRPCClient>::~Own() at memory.h:204:28
kj::Own<snej::shs::SecretRPCClient>::~Own() at memory.h:204:26
myapp::net::Client::ConnectionImpl::~ConnectionImpl() at Client.cc:281:19
myapp::net::Client::ConnectionImpl::~ConnectionImpl() at Client.cc:281:19
myapp::net::Client::ConnectionImpl::~ConnectionImpl() at Client.cc:281:19
std::__1::default_delete<myapp::net::Client::Impl>::operator() const at
unique_ptr.h:57:5
std::__1::unique_ptr<myapp::net::Client::Impl,
std::__1::default_delete<myapp::net::Client::Impl> >::reset() at
unique_ptr.h:318:7
std::__1::unique_ptr<myapp::net::Client::Impl,
std::__1::default_delete<myapp::net::Client::Impl> >::~unique_ptr() at
unique_ptr.h:272:19
std::__1::unique_ptr<myapp::net::Client::Impl,
std::__1::default_delete<myapp::net::Client::Impl> >::~unique_ptr() at
unique_ptr.h:272:17
myapp::net::Client::~Client() at Client.cc:314:21
myapp::net::Client::~Client() at Client.cc:314:21
myapp::SyncTask::_run() at SyncTask.cc:166:5
myapp::SyncTask::run() const at SyncTask.cc:82:9
kj::_::RunnableImpl<myapp::SyncTask::run() at exception.h:319:5
kj::_::runCatchingExceptions() + 36
kj::Maybe<kj::Exception> kj::runCatchingExceptions<myapp::SyncTask::run() at
exception.h:332:10
myapp::SyncTask::run() at SyncTask.cc:82:9
SyncCommand::runSubcommand() at ClientMain.cc:842:24
InteractiveTool::runSubcommand() at InteractiveTool.cc:72:29
myappClient::run() at ClientMain.cc:178:13
Tool::main() at Tool.hh:63:20
main() at ClientMain.cc:188:28
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