I have some time to revisit this problem today. Running with GRPC VERBOSITY set to DEBUG gives me this (anything starts with* [2022-03-04T23* is my own logging):
[2022-03-04T23:15:41+10:00] [workflow_client] [info] [process 501457, thread 501457] Logger level is set at info. [2022-03-04T23:15:41+10:00] [workflow_client] [warning] [process 501457, thread 501457] Persistent not specified and will default to false D0304 23:15:41.640009936 501457 ev_posix.cc:172] Using polling engine: epollex D0304 23:15:41.640079032 501457 lb_policy_registry.cc:42] registering LB policy factory for "grpclb" D0304 23:15:41.640106084 501457 lb_policy_registry.cc:42] registering LB policy factory for "priority_experimental" D0304 23:15:41.640124027 501457 lb_policy_registry.cc:42] registering LB policy factory for "weighted_target_experimental" D0304 23:15:41.640127329 501457 lb_policy_registry.cc:42] registering LB policy factory for "pick_first" D0304 23:15:41.640150128 501457 lb_policy_registry.cc:42] registering LB policy factory for "round_robin" D0304 23:15:41.640153574 501457 lb_policy_registry.cc:42] registering LB policy factory for "ring_hash_experimental" D0304 23:15:41.640162650 501457 dns_resolver_ares.cc:624] Using ares dns resolver D0304 23:15:41.640230087 501457 certificate_provider_registry.cc:33] registering certificate provider factory for "file_watcher" D0304 23:15:41.640236782 501457 lb_policy_registry.cc:42] registering LB policy factory for "cds_experimental" D0304 23:15:41.640241375 501457 lb_policy_registry.cc:42] registering LB policy factory for "xds_cluster_impl_experimental" D0304 23:15:41.640258747 501457 lb_policy_registry.cc:42] registering LB policy factory for "xds_cluster_resolver_experimental" D0304 23:15:41.640262652 501457 lb_policy_registry.cc:42] registering LB policy factory for "xds_cluster_manager_experimental" [2022-03-04T23:15:41+10:00] [workflow_client] [info] [process 501457, thread 501457] gRPC client at localhost:4500 is registering with the server... I0304 23:15:41.640909979 501458 subchannel.cc:945] subchannel 0x55e6713dcea0 {address=ipv6:[::1]:4500, args=grpc.client_channel_factory=0x55e6713d6a20, grpc.default_authority=localhost:4500, grpc.internal.subchannel_pool=0x55e6713bb810, grpc.primary_user_agent=grpc-c++/1.44.0-dev, grpc.resource_quota=0x55e6713d7b40, grpc.server_uri=dns:///localhost:4500}: connect failed: {"created":"@1646399741.640833261","description":"Failed to connect to remote host: Connection refused","errno":111,"file":"/home/hoover/workspace/DPAV/Linux/OpenSource/gRPC-focal/src/core/lib/iomgr/tcp_client_posix.cc","file_line":200,"os_error":"Connection refused","syscall":"connect","target_address":"ipv6:[::1]:4500"} [2022-03-04T23:15:41+10:00] [workflow_client] [info] [process 501457, thread 501457] ... gRPC client at localhost:4500 successfully registered with server I0304 23:15:41.642209150 501462 server_builder.cc:327] Synchronous server. Num CQs: 1, Min pollers: 1, Max Pollers: 2, CQ timeout (msec): 10000 I0304 23:15:41.642437546 501462 socket_utils_common_posix.cc:353] TCP_USER_TIMEOUT is available. TCP_USER_TIMEOUT will be used thereafter [2022-03-04T23:15:41+10:00] [workflow_client] [info] [process 501457, thread 501457] JobClient client constructed. [2022-03-04T23:15:41+10:00] [workflow_client] [info] [process 501457, thread 501457] HelloWorld client constructed. [2022-03-04T23:15:41+10:00] [workflow_client] [info] [process 501457, thread 501457] New id assigned: localhost:4502:598ec6d9-8a75-4500-b34f-9cab3160c642 [2022-03-04T23:15:41+10:00] [workflow_client] [info] [process 501457, thread 501457] Client localhost:4502:598ec6d9-8a75-4500-b34f-9cab3160c642 is trying to register client for job type: : hello_world [2022-03-04T23:15:41+10:00] [workflow_client] [info] [process 501457, thread 501463] Client localhost:4502:598ec6d9-8a75-4500-b34f-9cab3160c642 registered with Job Server 4501 [2022-03-04T23:15:41+10:00] [workflow_client] [info] [process 501457, thread 501457] Client localhost:4502:598ec6d9-8a75-4500-b34f-9cab3160c642 received ACK for RegisterNewClient. [2022-03-04T23:15:41+10:00] [workflow_client] [info] [process 501457, thread 501484] Client localhost:4502:598ec6d9-8a75-4500-b34f-9cab3160c642 identified JSON message as issueNewJob. [2022-03-04T23:15:41+10:00] [workflow_client] [info] [process 501457, thread 501484] Client localhost:4502:598ec6d9-8a75-4500-b34f-9cab3160c642 accepted job. [2022-03-04T23:15:41+10:00] [workflow_client] [info] [process 501457, thread 501484] Client localhost:4502:598ec6d9-8a75-4500-b34f-9cab3160c642 acknowledged the job. [2022-03-04T23:15:42+10:00] [workflow_client] [info] [process 501457, thread 501485] Client localhost:4502:598ec6d9-8a75-4500-b34f-9cab3160c642 identified JSON message as jobProgressUpdateAck. [2022-03-04T23:15:42+10:00] [workflow_client] [info] [process 501457, thread 501484] Client localhost:4502:598ec6d9-8a75-4500-b34f-9cab3160c642 received ACK for final JobProgressUpdate. [2022-03-04T23:15:42+10:00] [workflow_client] [info] [process 501457, thread 501484] Client localhost:4502:598ec6d9-8a75-4500-b34f-9cab3160c642 finished processing a job and now shutting down. D0304 23:15:42.482888232 501484 chttp2_transport.cc:1715] ipv4:127.0.0.1:56916: Sending goaway err={"created":"@1646399742.482860742","description":"Server shutdown","file":"/home/hoover/workspace/DPAV/Linux/OpenSource/gRPC-focal/src/core/lib/surface/server.cc","file_line":481,"grpc_status":0} On Monday, February 14, 2022 at 1:37:12 PM UTC+10 Anh Tran wrote: > Hi team, > > Yes. that is the case. I am also confused... > > > On Saturday, February 12, 2022 at 9:00:29 AM UTC+10 veb...@google.com > wrote: > >> Hi Ahn, >> >> Thanks for the stack trace but I'm a bit confused. Is this what you got >> while your program was stuck waiting forever? It looks a bit off because >> Valgrind complains about "Conditional jump or move depends on uninitialised >> value" and callstack appears to show some deadline inside. >> >> On Thursday, February 10, 2022 at 1:10:12 AM UTC-8 Anh Tran wrote: >> >>> Hi @google.com,, >>> >>> Thanks for getting back to me at this. Please see my stack trace from >>> valgrind: >>> >>> ==287419== Memcheck, a memory error detector >>> ==287419== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et >>> al. >>> ==287419== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright >>> info >>> ==287419== Command: >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli --job-type >>> slam >>> ==287419== Parent PID: 287418 >>> ==287419== >>> ==287419== Conditional jump or move depends on uninitialised value(s) >>> ==287419== at 0x91743A: void** NextStackFrame<true, false>(void**, >>> void const*, unsigned long, unsigned long) (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x916F98: int UnwindImpl<false, false>(void**, int*, >>> int, int, void const*, int*) (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x916D8D: absl::lts_20211102::GetStackTrace(void**, >>> int, int) (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x90F27C: absl::lts_20211102::(anonymous >>> namespace)::GetStack(void**, int) (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x924569: >>> absl::lts_20211102::synchronization_internal::GraphCycles::UpdateStackTrace(absl::lts_20211102::synchronization_internal::GraphId, >>> >>> int, int (*)(void**, int)) (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x90F342: >>> absl::lts_20211102::DeadlockCheck(absl::lts_20211102::Mutex*) (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x90F84C: >>> absl::lts_20211102::DebugOnlyDeadlockCheck(absl::lts_20211102::Mutex*) (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x90FB6E: absl::lts_20211102::Mutex::Lock() (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x8A3AD0: gpr_mu_lock (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x7DFA25: begin_worker(grpc_pollset*, >>> grpc_pollset_worker*, grpc_pollset_worker**, long) (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x7DFFDA: pollset_work(grpc_pollset*, >>> grpc_pollset_worker**, long) (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x7716F4: pollset_work(grpc_pollset*, >>> grpc_pollset_worker**, long) (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== Uninitialised value was created by a stack allocation >>> ==287419== at 0x1C3FD0: >>> Emesent::GRPCQueue::Stub::Register(grpc::ClientContext*, Emesent::Empty >>> const&, Emesent::RegistrationResponse*) (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== >>> ==287419== Thread 7 grpcpp_sync_ser: >>> ==287419== Conditional jump or move depends on uninitialised value(s) >>> ==287419== at 0x916F7F: int UnwindImpl<false, false>(void**, int*, >>> int, int, void const*, int*) (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x916D8D: absl::lts_20211102::GetStackTrace(void**, >>> int, int) (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x90F27C: absl::lts_20211102::(anonymous >>> namespace)::GetStack(void**, int) (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x924569: >>> absl::lts_20211102::synchronization_internal::GraphCycles::UpdateStackTrace(absl::lts_20211102::synchronization_internal::GraphId, >>> >>> int, int (*)(void**, int)) (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x90F342: >>> absl::lts_20211102::DeadlockCheck(absl::lts_20211102::Mutex*) (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x90F84C: >>> absl::lts_20211102::DebugOnlyDeadlockCheck(absl::lts_20211102::Mutex*) (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x90FB6E: absl::lts_20211102::Mutex::Lock() (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x8A3AD0: gpr_mu_lock (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x5121A4: grpc_cq_begin_op(grpc_completion_queue*, >>> void*) (in /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x5199C4: >>> grpc_core::Server::ShutdownAndNotify(grpc_completion_queue*, void*) (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x51CD63: grpc_server_shutdown_and_notify (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== by 0x231AA2: grpc::Server::ShutdownInternal(gpr_timespec) >>> (in /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== Uninitialised value was created by a stack allocation >>> ==287419== at 0x1D37E0: std::_Function_handler<void >>> (std::__cxx11::basic_string<char, std::char_traits<char>, >>> std::allocator<char> > const&, std::__cxx11::basic_string<char, >>> std::char_traits<char>, std::allocator<char> > const&), >>> workflow_client::GRPCIcomm::start_and_wait()::{lambda(std::__cxx11::basic_string<char, >>> >>> std::char_traits<char>, std::allocator<char> > const&, >>> std::__cxx11::basic_string<char, std::char_traits<char>, >>> std::allocator<char> > const&)#1}>::_M_invoke(std::_Any_data const&, >>> std::__cxx11::basic_string<char, std::char_traits<char>, >>> std::allocator<char> > const&, std::__cxx11::basic_string<char, >>> std::char_traits<char>, std::allocator<char> > const&) (in >>> /home/atran/codes/workflow_client/dist/workflow/job_client_cli) >>> ==287419== >>> >>> In case this is interesting, this is how I start my server and wait >>> until shutdown: >>> >>> std::string server_addr_and_port = base_address_ + ":" + id_; >>> grpc::ServerBuilder server_builder; >>> server_builder.AddListeningPort(server_addr_and_port, grpc:: >>> InsecureServerCredentials()); >>> >>> GRPCQueueImpl grpc_queue_service; >>> server_builder.RegisterService(&grpc_queue_service); >>> server_ = server_builder.BuildAndStart(); >>> server_->Wait(); >>> On Thursday, February 10, 2022 at 9:08:39 AM UTC+10 ctmah...@gmail.com >>> wrote: >>> >>>> I have also experienced the same issue in my work environment. Our work >>>> around was to have N second timeout and check a shutdown flag and then >>>> call >>>> shutdown. >>>> >>>> >>>> >>>> On Feb 9, 2022 at 3:54 PM, <veb...@google.com' via grpc.io> wrote: >>>> >>>> Would you capture the call-stack when Shutdown function appears to hang? >>>> >>>> On Wednesday, February 2, 2022 at 10:24:14 PM UTC-8 Anh Tran wrote: >>>> >>>>> The last commit on my local copy of gRPC is 06 Jan 2022, so not that >>>>> old. >>>>> On Thursday, February 3, 2022 at 4:51:16 AM UTC+10 Easwar Swaminathan >>>>> wrote: >>>>> >>>>>> Has anyone of y'all seen this in a more recent version of gRPC. >>>>>> `1.30.2` is really old. >>>>>> >>>>>> On Tuesday, February 1, 2022 at 12:15:54 AM UTC-8 Prasanta Behera >>>>>> wrote: >>>>>> >>>>>>> No, I've not found any solution yet! I was trying to have a >>>>>>> hello-world kind of example to reproduce to open a ticket, but as you >>>>>>> said >>>>>>> with such simple examples it never reproduces... >>>>>>> >>>>>>> On Tuesday, February 1, 2022 at 1:42:43 PM UTC+5:30 Anh Tran wrote: >>>>>>> >>>>>>>> I should also add that this behavior happens during threading. >>>>>>>> >>>>>>>> On Tuesday, February 1, 2022 at 3:45:04 PM UTC+10 Anh Tran wrote: >>>>>>>> >>>>>>>>> Unfortunately I came across the same problem. >>>>>>>>> When trying to isolate the problem (having a simple hello world >>>>>>>>> server-client), the problem seems to go away, i.e server can be shut >>>>>>>>> down. >>>>>>>>> >>>>>>>>> But when using in my own project, this happens. And despite my >>>>>>>>> effort to track down the problem, I can't seem to spot one. >>>>>>>>> This is weird since this version of Shutdown should force shut >>>>>>>>> down after a certain period, as describe in the doc. >>>>>>>>> >>>>>>>>> Prasanta, do you happen to find the solution to your problem? >>>>>>>>> Maybe it will give a hint to mine. >>>>>>>>> >>>>>>>>> On Thursday, January 20, 2022 at 10:02:43 PM UTC+10 Prasanta >>>>>>>>> Behera wrote: >>>>>>>>> >>>>>>>>>> gRPC version : 1.30.2 (c++) >>>>>>>>>> $ gcc --version >>>>>>>>>> gcc (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609 >>>>>>>>>> >>>>>>>>>> We use gRPC is synchronous mode and stop our gRPC services with >>>>>>>>>> this code >>>>>>>>>> >>>>>>>>>> m_server->Shutdown(std::chrono::system_clock::now() + >>>>>>>>>> std::chrono::seconds(1)); >>>>>>>>>> m_server->Wait(); >>>>>>>>>> >>>>>>>>>> On rare occasions (about once in 1000 tries) the Shutdown() call >>>>>>>>>> does NOT return and the process just hangs. >>>>>>>>>> >>>>>>>>>> Is there anything I missing to have a reliable shutdown of the >>>>>>>>>> server? >>>>>>>>>> >>>>>>>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "grpc.io" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to grpc-io+u...@googlegroups.com. >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/grpc-io/96350454-3e52-4068-b3e1-1fea25537098n%40googlegroups.com >>>> >>>> <https://groups.google.com/d/msgid/grpc-io/96350454-3e52-4068-b3e1-1fea25537098n%40googlegroups.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>>> -- You received this message because you are subscribed to the Google Groups "grpc.io" group. 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