Root cause is envoy segfault. So the test is not flaky, but something in envoy is broken:

I0822 17:01:36.853] [2018-08-22 17:01:26.749][16922][critical][backtrace] bazel-out/k8-dbg/bin/external/envoy/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:125] Caught Bus error, suspect faulting address 0x7fdbf98e2028
I0822 17:01:36.853] [2018-08-22 17:01:26.754][16922][critical][backtrace] bazel-out/k8-dbg/bin/external/envoy/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:94] Backtrace thr<0> obj</home/bootstrap/go/bin/envoy> (If unsymbolized, use tools/stack_decode.py):
I0822 17:01:36.854] [2018-08-22 17:01:26.767][16922][critical][backtrace] bazel-out/k8-dbg/bin/external/envoy/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:114] thr<0> #0 0xc739fe Envoy::BlockMemoryHashSet<>::initialize()
I0822 17:01:36.857] [2018-08-22 17:01:26.779][16922][critical][backtrace] bazel-out/k8-dbg/bin/external/envoy/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:114] thr<0> #1 0xc6feec Envoy::BlockMemoryHashSet<>::BlockMemoryHashSet()
I0822 17:01:36.858] [2018-08-22 17:01:26.792][16922][critical][backtrace] bazel-out/k8-dbg/bin/external/envoy/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:114] thr<0> #2 0xc6bfc5 Envoy::Server::HotRestartImpl::HotRestartImpl()
I0822 17:01:36.859] [2018-08-22 17:01:26.808][16922][critical][backtrace] bazel-out/k8-dbg/bin/external/envoy/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:114] thr<0> #3 0x812fbf Envoy::MainCommonBase::MainCommonBase()
I0822 17:01:36.860] [2018-08-22 17:01:26.826][16922][critical][backtrace] bazel-out/k8-dbg/bin/external/envoy/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:114] thr<0> #4 0x813ca1 Envoy::MainCommon::MainCommon()
I0822 17:01:36.860] [2018-08-22 17:01:26.838][16922][critical][backtrace] bazel-out/k8-dbg/bin/external/envoy/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:114] thr<0> #5 0x812061 std::make_unique<>()
I0822 17:01:36.861] [2018-08-22 17:01:26.851][16922][critical][backtrace] bazel-out/k8-dbg/bin/external/envoy/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:114] thr<0> #6 0x811a6b main
I0822 17:01:36.862] [2018-08-22 17:01:26.851][16922][critical][backtrace] bazel-out/k8-dbg/bin/external/envoy/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:104] thr<0> obj</lib/x86_64-linux-gnu/libc.so.6>
I0822 17:01:36.862] [2018-08-22 17:01:26.851][16922][critical][backtrace] bazel-out/k8-dbg/bin/external/envoy/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:117] thr<0> #7 0x7fdbf9af582f (unknown)
I0822 17:01:36.862] [2018-08-22 17:01:26.851][16922][critical][backtrace] bazel-out/k8-dbg/bin/external/envoy/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:104] thr<0> obj</home/bootstrap/go/bin/envoy>
I0822 17:01:36.863] [2018-08-22 17:01:26.864][16922][critical][backtrace] bazel-out/k8-dbg/bin/external/envoy/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:114] thr<0> #8 0x585078 _start
I0822 17:01:36.863] [2018-08-22 17:01:26.864][16922][critical][backtrace] bazel-out/k8-dbg/bin/external/envoy/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:121] end backtrace thread 0

/cc @qiwzhang @bianpengyuan

Flaky test on prow: TestTCPMixerFilterPeriodicalReport #8133

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