docker-py exec api make docker daemon panic

[xidianwlc]

• docker-py version 1.7.2
• docker version 1.10.2
• system use centos7
  cat /etc/system-release CentOS Linux release 7.1.1503 (Core)
• my test script

import sys
from docker import Client
cli = Client(base_url='unix://var/run/docker.sock', version="1.22")
while True:
    cmd_str = raw_input(">>> ")
    if cmd_str == "exit":
        print ">>> bye"
        sys.exit(1)
    exec_instance = cli.exec_create("5ea878732fc9", cmd=cmd_str, stdout=True, stderr=True, stdin=True, user='root')
    exec_id = exec_instance["Id"]
    data = cli.exec_start(exec_id, tty=True, detach=True)
    print data

python exception
Traceback (most recent call last): File "test_exec.py", line 25, in <module> data = cli.exec_start(exec_id, tty=True, detach=True) File "/data/server/python/lib/python2.7/site-packages/docker_py-1.7.2-py2.7.egg/docker/utils/decorators.py", line 35, in wrapper return f(self, *args, **kwargs) File "/data/server/python/lib/python2.7/site-packages/docker_py-1.7.2-py2.7.egg/docker/api/exec_api.py", line 70, in exec_start self._url('/exec/{0}/start', exec_id), data=data, stream=stream File "/data/server/python/lib/python2.7/site-packages/docker_py-1.7.2-py2.7.egg/docker/client.py", line 170, in _post_json return self._post(url, data=json.dumps(data2), **kwargs) File "/data/server/python/lib/python2.7/site-packages/docker_py-1.7.2-py2.7.egg/docker/utils/decorators.py", line 47, in inner return f(self, *args, **kwargs) File "/data/server/python/lib/python2.7/site-packages/docker_py-1.7.2-py2.7.egg/docker/client.py", line 108, in _post return self.post(url, **self._set_request_timeout(kwargs)) File "/data/server/python/lib/python2.7/site-packages/requests/sessions.py", line 508, in post return self.request('POST', url, data=data, json=json, **kwargs) File "/data/server/python/lib/python2.7/site-packages/requests/sessions.py", line 465, in request resp = self.send(prep, **send_kwargs) File "/data/server/python/lib/python2.7/site-packages/requests/sessions.py", line 573, in send r = adapter.send(request, **kwargs) File "/data/server/python/lib/python2.7/site-packages/requests/adapters.py", line 415, in send raise ConnectionError(err, request=request) requests.exceptions.ConnectionError: ('Connection aborted.', BadStatusLine("''",))
docker daemon logs:
time="2016-03-09T10:36:55.987375761+08:00" level=error msg="Error running exec in container: Cannot run exec command 8ec3200143bb2968cf54315509659915c98b5d5a6b55173533e6d172c7de2879 in cont panic: runtime error: invalid memory address or nil pointer dereference [signal 0xb code=0x1 addr=0x20 pc=0x6b32e3]

[TomasTomecek]

...which means this is a bug in engine, not docker-py; server should definitely not segfault when client sends a request

[shin-]

Try updating the engine to 1.10.3?

moby/moby#20638

[shin-]

Ah, my bad, 1.10.3 isn't out yet. However there's a release candidate if you want to test it. https://github.com/docker/docker/releases/tag/v1.10.3-rc1

[TomasTomecek]

@xidianwlc seems that you've hit this: moby/moby#20647