examples/cpp/helloworld/greet_server hang up with 100% cpu usage

[danielhongwoo]

What version of gRPC and what language are you using?

• v1.26.0
• c++

What operating system (Linux, Windows,...) and version?

• Linux, Ubuntu 16.04

What runtime / compiler are you using (e.g. python version or version of gcc)

• g++ (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609

What did you do?

git clone https://github.com/grpc/grpc.git
cd grpc
git checkout v1.26.0
git submodule update --init
cd examples/cpp/helloworld/
mkdir build
cd build
cmake -DGRPC_AS_SUBMODULE=ON -DBUILD_SHARED_LIBS=ON ..
make -j7

What did you expect to see?

• helloworld example works fine.

What did you see instead?

• helloworld example doens't work with 100% cpu usage on v1.26.0.

$ GRPC_VERBOSITY=debug GRPC_TRACE=api ./greeter_server
D1224 13:52:19.215704837   28805 ev_posix.cc:174]            Using polling engine: epollex
D1224 13:52:19.216050358   28805 dns_resolver_ares.cc:503]   Using ares dns resolver
<<< HANG UP for more than 5 minutes >>>

• but it works just fine on v1.25, v1.24

[stale]

This issue/PR has been automatically marked as stale because it has not had any update (including commits, comments, labels, milestones, etc) for 30 days. It will be closed automatically if no further update occurs in 7 day. Thank you for your contributions!

[yashykt]

This was fixed by #21662