#0  malloc_consolidate (av=av@entry=0x7fcd30000020) at malloc.c:4462
#1  0x00007fcd984f27d8 in _int_malloc (av=av@entry=0x7fcd30000020, bytes=bytes@entry=56360) at malloc.c:3703
#2  0x00007fcd984f52ed in __GI___libc_malloc (bytes=56360) at malloc.c:3065
#3  0x00007fcd55a34b5f in gpr_malloc ()
   from /usr/local/lib/python3.6/dist-packages/torchbeast/actorpool.cpython-36m-x86_64-linux-gnu.so
#4  0x00007fcd55a411ce in ?? ()
   from /usr/local/lib/python3.6/dist-packages/torchbeast/actorpool.cpython-36m-x86_64-linux-gnu.so
#5  0x00007fcd55a3e7a1 in grpc_core::ExecCtx::Flush() ()
   from /usr/local/lib/python3.6/dist-packages/torchbeast/actorpool.cpython-36m-x86_64-linux-gnu.so
#6  0x00007fcd55ace502 in ?? ()
   from /usr/local/lib/python3.6/dist-packages/torchbeast/actorpool.cpython-36m-x86_64-linux-gnu.so
#7  0x00007fcd55a56a69 in ?? ()
   from /usr/local/lib/python3.6/dist-packages/torchbeast/actorpool.cpython-36m-x86_64-linux-gnu.so
#8  0x00007fcd55a574fb in grpc_completion_queue_pluck ()
   from /usr/local/lib/python3.6/dist-packages/torchbeast/actorpool.cpython-36m-x86_64-linux-gnu.so
#9  0x00007fcd55a342d8 in grpc::CoreCodegen::grpc_completion_queue_pluck(grpc_completion_queue*, void*, gpr_timespec, void*) ()
   from /usr/local/lib/python3.6/dist-packages/torchbeast/actorpool.cpython-36m-x86_64-linux-gnu.so
#10 0x00007fcd55a2381a in grpc::CompletionQueue::Pluck (tag=0x7fcd4cff8b60, this=0x7fcd30000fc0)
    at /usr/local/include/grpcpp/impl/codegen/completion_queue.h:311
#11 grpc::ClientReaderWriter<rpcenv::Action, rpcenv::Step>::Read (msg=0x7fcd4cff8b30, this=0x7fcd30000fa0)
    at /usr/local/include/grpcpp/impl/codegen/sync_stream.h:481
#12 ActorPool::loop (this=0x1d982e0, loop_index=<optimized out>, address=...) at torchbeast/actorpool.cc:368
#13 0x00007fcd5830e57f in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#14 0x00007fcd982466db in start_thread (arg=0x7fcd4cff9700) at pthread_create.c:463
#15 0x00007fcd9857f88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95