Fatal: grpc_call_start_batch returned 8

Abhishek Parmar

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Aug 17, 2018, 6:16:13 PM8/17/18

to grpc.io

I have a weird problem with one of my unit tests that is using streaming grpc. The test crashes about 10/1000 times but only when run under bazel (i.e bazel test my_test). This happens with or without bazel sandboxing.

When run on its own it works fine thousands of times.

The most frequent test failure is

E0817 19:54:09.499559477 18 server_cc.cc:629] Fatal: grpc_call_start_batch returned 8

E0817 19:54:09.499590418 18 server_cc.cc:630] ops[0]: SEND_INITIAL_METADATA(nil)

E0817 19:54:09.499595057 18 server_cc.cc:630] ops[1]: SEND_MESSAGE ptr=0x2330f00

Sometimes I also see:

E0817 19:54:21.345913273 18 proto_buffer_writer.h:65] assertion failed: !byte_buffer->Valid()

Does this ring a bell for anyone? I did not find any similar issues reported so I thought I would ask here before I dig any deeper.

I am using grpc v1.14.1, though the failure happens in a similar place even in 1.4.2 (from which I am upgrading our codebase).

Thanks in advance.

Abhishek

Srini Polavarapu

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Aug 18, 2018, 11:42:29 PM8/18/18

to grpc.io

There is some flakiness in bazel tests. Please file an issue on github and provide the steps in detail to reproduce this.

Thanks.

Jan Tattermusch

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Aug 20, 2018, 2:06:59 AM8/20/18

to Srini Polavarapu, grpc.io

FTR, it looks like "grpc_call_start_batch returned 8" corresponds to:

/** there is already an outstanding read/write operation on the call */

GRPC_CALL_ERROR_TOO_MANY_OPERATIONS,
That may mean that for a given call, you are not waiting for outstanding read/write operations to finish (the tag completion returned by grpc_completion_queue) before starting a new read/write operation on that call
(which is a violation of how gRPC's low level API should be used).

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