The root cause is mainly from the missing of escape character for rsync option over ssh command:

Before the failure: the command is 

ssh 100.115.219.136 rsync --rsh=\"/usr/bin/ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o BatchMode=yes -o ConnectTimeout=30 -o ServerAliveInterval=900 -o ServerAliveCountMax=3 -o ConnectionAttempts=4 -o Protocol=2 -x -a -l root\" -L --timeout=1800 -az --no-o --no-g /home/chromeos-test/images/veyron_minnie-release/R63-10032.71.0/telemetry_src/src/tools/perf/page_sets/data/jetstream_000.wprgo ch


and now it failed without the escape character:

ssh 100.115.219.136 rsync -L  --timeout=1800 -e '/usr/bin/ssh -a -x  -o Protocol=2 -o StrictHostKeyChe
cking=no -o UserKnownHostsFile=/dev/null -o BatchMode=yes -o ConnectTimeout=30 -o ServerAliveInterval=900 -o ServerAliveCountMax=3 -o ConnectionAttempts=4 -l root -p 22' -az --no-o --no-g  /home/chromeos-test/images/veyron_minnie-release/R65-10196.0.0/telemetry_src/src/tools/perf/page_sets/data/jetstream_000.wprgo chromeos4-row9-rack11-host17:/usr/local/telemetry/src/tools/perf/page_sets/data/jetstream_000.wprgo

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/fd8eb249926efb6571dd31a24f20c988a874d227

commit fd8eb249926efb6571dd31a24f20c988a874d227
Author: Chung-yih Wang <cywang@google.com>
Date: Mon Dec 11 20:47:47 2017

telemetry_runner: Add quotes for rsync command

The rsync option over ssh was eaten by the ssh command which failed
the rsync command for telemetry_Benchmark tests to copy the wprgo
files to DUT via devserver. This patch fixes it with adding the
quotes for the rsync command over ssh.

BUG= chromium:793243 
TEST=manual test with command with escape character added:

ssh DEVSERVER_IP "rsync -L --delete --timeout=1800
--rsh='/usr/bin/ssh -a -x -o
ControlPath=/tmp/_autotmp_qk913Mssh-master/socket -o Protocol=2 -o
StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o
BatchMode=yes -o ConnectTimeout=30 -o ServerAliveInterval=900 -o
ServerAliveCountMax=3 -o ConnectionAttempts=4 -l root -p 22' -az --no-o
--no-g
PATH_OF_jetstream_000.wprgo
\"DUT_IP:/usr/local/telemetry/src/tools/perf/page_sets/data/jetstream_000.wprgo\""

Change-Id: Ie61516d5ef4cd54a8fa70e9cefea73f7ce1b9e03
Signed-off-by: Chung-yih Wang <cywang@google.com>
Reviewed-on: https://chromium-review.googlesource.com/818590
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Reviewed-by: Ben Cheng <bccheng@chromium.org>

[modify] https://crrev.com/fd8eb249926efb6571dd31a24f20c988a874d227/server/cros/telemetry_runner.py

https://stainless.corp.google.com/search?exclude_cts=true&exclude_non_release=true&test=%5Etelemetry_&suite=%5Ecrosbolt%5C_perf%5C_perbuild%24&view=matrix&col=build&row=test&first_date=20171206&last_date=20171212