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

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