GRPC 服务器无法启动（欢迎服务器示例）

Question

根据安装文档（ https://grpc.io/docs/quickstart/cpp/ ）安装了 GRPC (C++)。 构建成功完成。 但是，在构建和执行 helloworld 示例 ( examples/cpp/helloworld/ ) 之后， greeter_server挂起。 日志如下：

GRPC_VERBOSITY=DEBUG ./greeter_server      
D1116 13:26:27.355365283    6807 ev_posix.cc:174]            Using polling engine: epollex
D1116 13:26:27.355788088    6807 dns_resolver_ares.cc:503]   Using ares dns resolver

预期的行为是greeter_client显示Greeter received: Hello world 。

使用调试信息构建后，使用 GDB 运行并获得线程转储：

Thread 3 (Thread 0x7fffeffff700 (LWP 2561)):
#0  futex_wait_cancelable (private=0, expected=0, futex_word=0x55555559cef0) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55555559ce90, cond=0x55555559cec8) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55555559cec8, mutex=0x55555559ce90) at pthread_cond_wait.c:655
#3  0x00007ffff7daf392 in gpr_cv_wait () from /usr/local/lib/libgrpc.so.9
#4  0x00007ffff7f27930 in grpc_core::Executor::ThreadMain(void*) () from /usr/local/lib/libgrpc++.so.1
#5  0x00007ffff7db0ed3 in ?? () from /usr/local/lib/libgrpc.so.9
#6  0x00007ffff701cfa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#7  0x00007ffff71404cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7ffff6e81700 (LWP 2560)):
#0  futex_wait_cancelable (private=0, expected=0, futex_word=0x5555555a0e20) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x5555555a0dc0, cond=0x5555555a0df8) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x5555555a0df8, mutex=0x5555555a0dc0) at pthread_cond_wait.c:655
#3  0x00007ffff7daf392 in gpr_cv_wait () from /usr/local/lib/libgrpc.so.9
#4  0x00007ffff7f27930 in grpc_core::Executor::ThreadMain(void*) () from /usr/local/lib/libgrpc++.so.1
#5  0x00007ffff7db0ed3 in ?? () from /usr/local/lib/libgrpc.so.9
#6  0x00007ffff701cfa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#7  0x00007ffff71404cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7ffff6e84cc0 (LWP 2554)):
#0  __strcmp_avx2 () at ../sysdeps/x86_64/multiarch/strcmp-avx2.S:737
#1  0x00007ffff7f5aaac in grpc_core::TraceFlagList::Set(char const*, bool) () from /usr/local/lib/libgrpc++.so.1
#2  0x00007ffff7f5abbe in grpc_tracer_init() () from /usr/local/lib/libgrpc++.so.1
#3  0x00007ffff7cc9361 in grpc_init () from /usr/local/lib/libgrpc.so.9
#4  0x0000555555564e36 in grpc::GrpcLibraryCodegen::GrpcLibraryCodegen (this=0x55555559bd30, call_grpc_init=true) at /usr/local/include/grpcpp/impl/codegen/grpc_library.h:45
#5  0x00007ffff7edf49e in grpc_impl::ServerBuilder::BuildAndStart() () from /usr/local/lib/libgrpc++.so.1
#6  0x0000555555575c29 in RunServer () at greeter_server.cc:61
#7  0x0000555555575d7d in main (argc=1, argv=0x7fffffffdb78) at greeter_server.cc:71

Answer 1

确保您没有将库 grpc_unsecure 与其他 grpc 库链接在一起。

https://github.com/grpc/grpc/issues/20757#issuecomment-545773014