I have seen the below error trace during rpc gets invoked in the client 
side.

E0108 23:57:39.627493254 13286 ev_epollex_linux.cc:512] Error shutting down 
fd 43. errno: 9

Adding the backtrace taken from gdb below for reference.
(gdb) bt #0 0x00007ffff6a21770 in shutdown () from 
/lib/x86_64-linux-gnu/libc.so.6 #1 0x00007ffff5c3a085 in fd_shutdown 
(fd=0x7fff8006d8c0, why=0x7fff640008e0) at 
src/core/lib/iomgr/ev_epollex_linux.cc:491 #2 0x00007ffff5ce4db5 in 
fd_node_shutdown_locked (reason=reason@entry=0x7ffff5dce61d 
"grpc_ares_ev_driver_shutdown", fdn=<optimized out>, fdn=<optimized out>) 
at 
src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_ev_driver.cc:127
 
#3 0x00007ffff5ce5763 in fd_node_shutdown_locked (fdn=0x7fff80059190, 
fdn=0x7fff80059190, reason=0x7ffff5dce61d "grpc_ares_ev_driver_shutdown") 
at 
src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_ev_driver.cc:124
 
#4 grpc_ares_ev_driver_shutdown_locked (ev_driver=<optimized out>) at 
src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_ev_driver.cc:184
 
#5 0x00007ffff5ce57ee in on_timeout_locked (arg=0x7fff8005b5f0, error=0x0) 
at 
src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_ev_driver.cc:214
 
#6 0x00007ffff5c3584a in grpc_combiner_continue_exec_ctx () at 
src/core/lib/iomgr/combiner.cc:268 #7 0x00007ffff5c3f357 in 
grpc_core::ExecCtx::Flush (this=0x7fff799f2d70) at 
src/core/lib/iomgr/exec_ctx.cc:151 #8 0x00007ffff5c3aba4 in pollset_work 
(pollset=0x7fff800592b0, worker_hdl=0x7fff799f2c20, 
deadline=140735341239128) at src/core/lib/iomgr/ev_epollex_linux.cc:1151 #9 
0x00007ffff5cb0741 in run_poller (arg=0x7fff80059a00, error=<optimized 
out>) at src/core/ext/filters/client_channel/backup_poller.cc:122 #10 
0x00007ffff5c3f0ce in exec_ctx_run (closure=<optimized out>, error=0x0) at 
src/core/lib/iomgr/exec_ctx.cc:40 #11 0x00007ffff5c3f33c in 
grpc_core::ExecCtx::Flush (this=0x7fff799f2d70) at 
src/core/lib/iomgr/exec_ctx.cc:148 #12 0x00007ffff5c4f134 in 
run_some_timers () at src/core/lib/iomgr/timer_manager.cc:140 #13 
timer_main_loop () at src/core/lib/iomgr/timer_manager.cc:246 #14 
timer_thread (completed_thread_ptr=0x7fff700008e0) at 
src/core/lib/iomgr/timer_manager.cc:293 #15 0x00007ffff5cef443 in 
grpc_core::(anonymous 
namespace)::ThreadInternalsPosix::ThreadInternalsPosix(char const*, void 
(*)(void*), void*, bool*, grpc_core::Thread::Options 
const&)::{lambda(void*)#1}::_FUN(void*) () at 
src/core/lib/gprpp/thd_posix.cc:114 #16 0x00007ffff77a7064 in start_thread 
() from /lib/x86_64-linux-gnu/libpthread.so.0 #17 0x00007ffff6a2062d in 
clone () from /lib/x86_64-linux-gnu/libc.so.6 

 Please let me know why this error trace is coming and how to resolve this. 
thanks!!!

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