title: cloudrun failing with find_vma failed
body: <p>my dockerfile for cloud run is as below. </p>
  
  <pre><code>FROM alpine:3.10.5
  
  USER root
  
  RUN apk update \
  &amp;&amp; apk upgrade \
  &amp;&amp; apk add --no-cache bash \
  &amp;&amp; apk add --no-cache --virtual=build-dependencies unzip \
  &amp;&amp; apk add --no-cache curl \
  &amp;&amp; apk add --no-cache openjdk8-jre
  
  RUN apk add --no-cache python3 \
  &amp;&amp; python3 -m ensurepip \
  &amp;&amp; pip3 install --upgrade pip setuptools wheel \
  &amp;&amp; rm -r /usr/lib/python*/ensurepip &amp;&amp; \
  if [ ! -e /usr/bin/pip ]; then ln -s pip3 /usr/bin/pip ; fi &amp;&amp; \
  if [[ ! -e /usr/bin/python ]]; then ln -sf /usr/bin/python3 /usr/bin/python; fi 
  
  WORKDIR /opt/bin
  
  RUN pip install Flask 'gunicorn&gt;=20.0.1,&lt;21' sqlalchemy pg8000 logger
  
  COPY &lt;some jar files&gt;.jar /opt/bin/
  COPY *.py /opt/bin/
  RUN rm -r /root/.cache
  
  CMD exec gunicorn --bind :$PORT --workers 2 --threads 8 --worker-tmp-dir /dev/shm --timeout 30 http_test 
  </code></pre>
  
  <p>when I run the docker image on cloudrun, i get the following error when I send a GET request to the URL given by Cloudrun:</p>
  
  <pre><code>020-05-04 13:22:14.551 ISTContainer Sandbox: Unsupported syscall membarrier(0x10,0x0,0x0,0x8,0x3e57651d89a0,0x3e57651d8a30). It is very likely that you can safely ignore this message and that this is not the cause of any error you might be troubleshooting. Please, refer to https://gvisor.dev/c/linux/amd64/membarrier for more information.
  2020-05-04 13:22:14.603 ISTOpenJDK 64-Bit Server VM warning: Can't detect primordial thread stack location - find_vma failed
  </code></pre>
  
  <p>Have tried different alpine images, switched to gunicorn20.0.1 to avoid libc issues, no avail. Any suggestions, help would be much appreciated.</p>