websocket closing and/or on-open error

[ebrevdo]

On OS X, running emacs/ein via:

$ EMACS=/usr/local/Cellar/emacs/HEAD/Emacs.app/Contents/MacOS/Emacs lisp/zeroein.el

Steps to reproduce the problem

1. Start emacs
2. Run ein:notebooklist-open
3. Select a notebook and hit "Open"

Expected output

The notebook opens, no error messages.

Your EIN configuration (in .emacs.d/init.el or somewhere else)

using zeroein

Your IPython configuration

1. What is your IPython version? (run ipython --version):

$ ipython --version
0.13.1

1. How do you start IPython? (e.g., ipython notebook --port 9999):

ipython notebook

1. What is your IPython notebook port number or URL?:

localhost:8888

Additional information (if any)

ipython + zmq installed installed by pip. zeromq=3.2.2 installed via
brew (pyzmq uses this version). tornado in ipython version 2.4.1,
pyzmq version 13.0.0.

System info:

("EIN system info"
 :emacs-version
 "GNU Emacs 24.3.50.1 (i386-apple-darwin11.4.2, NS apple-appkit-1138.51)
 of 2013-02-21 on eugbook.local"
 :emacs-bzr-version nil
 :window-system ns
 :emacs-variant nil
 :os
 (:uname
  "Darwin eugbook.local 11.4.2 Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64 x86_64
"
  :lsb-release nil)
 :image-types
 (png gif tiff jpeg xpm xbm pbm)
 :image-types-available
 (png gif tiff jpeg xpm xbm pbm)
 :request
 (:backend curl)
 :ein
 (:version "0.2.1alpha2.e5b53e5"
       :source-dir "/tmp/emacs-ipython-notebook/lisp/")
 :lib
 ((:name "websocket"
     :path "/tmp/emacs-ipython-notebook/lib/websocket/websocket.el"
     :featurep t
     :version-var websocket-version
     :version "0.93.1")
  (:name "request"
     :path "/tmp/emacs-ipython-notebook/lib/request/request.el"
     :featurep t
     :version-var request-version
     :version "0.2.0alpha1")
  (:name "auto-complete"
     :path "/tmp/emacs-ipython-notebook/lib/auto-complete/auto-complete.el"
     :featurep t
     :version-var nil
     :version nil)
  (:name "mumamo"
     :path "/tmp/emacs-ipython-notebook/lib/nxhtml/util/mumamo.el"
     :featurep nil
     :version-var nil
     :version nil)
  (:name "auto-complete"
     :path "/tmp/emacs-ipython-notebook/lib/auto-complete/auto-complete.el"
     :featurep t
     :version-var nil
     :version nil)
  (:name "popup"
     :path "/tmp/emacs-ipython-notebook/lib/popup/popup.el"
     :featurep t
     :version-var nil
     :version nil)
  (:name "fuzzy"
     :path "/tmp/emacs-ipython-notebook/lib/fuzzy/fuzzy.el"
     :featurep nil
     :version-var nil
     :version nil)
  (:name "pos-tip"
     :path "/tmp/emacs-ipython-notebook/lib/pos-tip/pos-tip.el"
     :featurep nil
     :version-var nil
     :version nil)
  (:name "python"
     :path "/tmp/emacs-ipython-notebook/lib/python/python.el"
     :featurep nil
     :version-var nil
     :version nil)
  (:name "markdown-mode"
     :path "/tmp/emacs-ipython-notebook/lib/markdown-mode/markdown-mode.el"
     :featurep nil
     :version-var nil
     :version nil)
  (:name "smartrep"
     :path "/tmp/emacs-ipython-notebook/lib/smartrep/smartrep.el"
     :featurep nil
     :version-var nil
     :version nil)))

1. Log and Backtrace

Messages

debug-on-error=t websocket-debug=t websocket-callback-debug-on-error=nil ein:debug=t ein:log-level=debug ein:log-message-level=verbose
ein: [info] Opening notebook 62a49637-6b89-454d-bd2f-2ccf94e89fa1...
ein: [info] Worksheet Untitled0 is ready
Making mumamo-bug-3467-w14 local to temp while let-bound!
Tested for Bug 3467 => PASSED
ein: [info] Notebook Untitled0 is ready
ein: [info] Kernel started: bbbb69e9-11e1-4b50-ae1d-97f829d6a06b
ein: [info] Starting WS: "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b"
Error found in callback on-open': [cl-struct-websocket-frame text {"header":{"msg_id":"ca13c350-904d-4d01-9c00-5704851e363d","username":"username","session":"c4df7ad1-167e-4eda-8e7e-b1f592d6e8d9","msg_type":"execute_request"},"metadata":{},"content":{"code":"__import__('sys').stdout.write(__import__('os').getcwd())","silent":true,"user_variables":[],"user_expressions":{},"allow_stdin":false},"parent_header":{}} nil t] Error found in callbackon-open': (ein:$websocket-onopen accessing a non-ein:$websocket)
Mark set [3 times]

websocket ws:///..../shell debug

[WS] Sending handshake, key: ZmplzHUA5XVNauqzmDppSA==, acceptance: j3zAZFvRpdQxQyRGIH7NORDvUfk=
[WS] Websocket opened
[WS] Received: HTTP/1.1 101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: j3zAZFvRpdQxQyRGIH7NORDvUfk=

[WS] Checking for accept header: Sec-WebSocket-Accept: j3zAZFvRpdQxQyRGIH7NORDvUfk=
[WS] Checking for upgrade header
[WS] Checking for connection header
[WS] Sending frame, opcode: text payload: username=
[WS] Sending frame, opcode: text payload: {"header":{"msg_id":"ca13c350-904d-4d01-9c00-5704851e363d","username":"username","session":"c4df7ad1-167e-4eda-8e7e-b1f592d6e8d9","msg_type":"execute_request"},"metadata":{},"content":{"code":"import('sys').stdout.write(import('os').getcwd())","silent":true,"user_variables":[],"user_expressions":{},"allow_stdin":false},"parent_header":{}}
[WS] Closing websocket
[WS] State change to deleted

[WS] Sending handshake, key: IfcUBziTB2WzxAzQkfbczg==, acceptance: JC5x68G56ATrQ6hOHzc5aREqIZc=
[WS] Websocket opened
[WS] Received: HTTP/1.1 101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: JC5x68G56ATrQ6hOHzc5aREqIZc=

[WS] Checking for accept header: Sec-WebSocket-Accept: JC5x68G56ATrQ6hOHzc5aREqIZc=
[WS] Checking for upgrade header
[WS] Checking for connection header

[tkf]

Hmm... I guess this one will be difficult to debug. Can you try again with C-u M-x ein:dev-start-debug (with the universal prefix key C-u this time)? I think you will get a backtrace. Please paste it here.

[ebrevdo]

Here's the backtrace:

Debugger entered--Lisp error: (websocket-closed . [cl-struct-websocket-frame text "{\"header\":{\"msg_id\":\"f78b0588-7ea8-4821-b6df-a7a44d2e5568\",\"username\":\"username\",\"session\":\"38e0581a-3a4e-430e-9d4a-0775ef025c8d\",\"msg_type\":\"execute_request\"},\"metadata\":{},\"content\":{\"code\":\"__import__('sys').stdout.write(__import__('os').getcwd())\",\"silent\":true,\"user_variables\":[],\"user_expressions\":{},\"allow_stdin\":false},\"parent_header\":{}}" nil t])
  signal(websocket-closed [cl-struct-websocket-frame text "{\"header\":{\"msg_id\":\"f78b0588-7ea8-4821-b6df-a7a44d2e5568\",\"username\":\"username\",\"session\":\"38e0581a-3a4e-430e-9d4a-0775ef025c8d\",\"msg_type\":\"execute_request\"},\"metadata\":{},\"content\":{\"code\":\"__import__('sys').stdout.write(__import__('os').getcwd())\",\"silent\":true,\"user_variables\":[],\"user_expressions\":{},\"allow_stdin\":false},\"parent_header\":{}}" nil t])
  (if ... nil ...)
  websocket-send([cl-struct-websocket open [cl-struct-ein:$websocket #0 ... nil ein:kernel--ws-closed-callback ... ... nil nil] ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell> nil "mIfpALeoarjg7JP8/W9C5g0a40Q=" nil] [cl-struct-websocket-frame text "{\"header\":{\"msg_id\":\"f78b0588-7ea8-4821-b6df-a7a44d2e5568\",\"username\":\"username\",\"session\":\"38e0581a-3a4e-430e-9d4a-0775ef025c8d\",\"msg_type\":\"execute_request\"},\"metadata\":{},\"content\":{\"code\":\"__import__('sys').stdout.write(__import__('os').getcwd())\",\"silent\":true,\"user_variables\":[],\"user_expressions\":{},\"allow_stdin\":false},\"parent_header\":{}}" nil t])
  websocket-send-text([cl-struct-websocket open [cl-struct-ein:$websocket #0 ... nil ein:kernel--ws-closed-callback ... ... nil nil] ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell> nil "mIfpALeoarjg7JP8/W9C5g0a40Q=" nil] "{\"header\":{\"msg_id\":\"f78b0588-7ea8-4821-b6df-a7a44d2e5568\",\"username\":\"username\",\"session\":\"38e0581a-3a4e-430e-9d4a-0775ef025c8d\",\"msg_type\":\"execute_request\"},\"metadata\":{},\"content\":{\"code\":\"__import__('sys').stdout.write(__import__('os').getcwd())\",\"silent\":true,\"user_variables\":[],\"user_expressions\":{},\"allow_stdin\":false},\"parent_header\":{}}")
  ein:websocket-send([cl-struct-ein:$websocket [cl-struct-websocket open #0 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell> nil "mIfpALeoarjg7JP8/W9C5g0a40Q=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] "{\"header\":{\"msg_id\":\"f78b0588-7ea8-4821-b6df-a7a44d2e5568\",\"username\":\"username\",\"session\":\"38e0581a-3a4e-430e-9d4a-0775ef025c8d\",\"msg_type\":\"execute_request\"},\"metadata\":{},\"content\":{\"code\":\"__import__('sys').stdout.write(__import__('os').getcwd())\",\"silent\":true,\"user_variables\":[],\"user_expressions\":{},\"allow_stdin\":false},\"parent_header\":{}}")
  (let* ... ... ... ... msg-id)
  (progn ... ...)
  (let* ... ... ...)
  ein:kernel-execute([cl-struct-ein:$kernel 8888 [object ein:events "ein:events" #s(hash-table size 65 test eq rehash-size 1.5 rehash-threshold 0.8 data (maybe_reset_undo\.Worksheet ... set_next_input\.Worksheet ... set_dirty\.Worksheet ... open_with_text\.Pager ... status_idle\.Kernel ... status_busy\.Kernel ... status_dead\.Kernel ... notebook_saving\.Notebook ... notebook_saved\.Notebook ... notebook_save_failed\.Notebook ... execution_count\.Kernel ... status_restarting\.Kernel ... ...))] "bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" [cl-struct-ein:$websocket [cl-struct-websocket open #1 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell> nil "mIfpALeoarjg7JP8/W9C5g0a40Q=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] [cl-struct-ein:$websocket [cl-struct-websocket open #1 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "YGKj8YOByrL0iQSAr2TIWDcMQVs=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] "/kernels" "/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" "ws://127.0.0.1:8888" t "username" "38e0581a-3a4e-430e-9d4a-0775ef025c8d" #s(hash-table size 65 test equal rehash-size 1.5 rehash-threshold 0.8 data ( ...)) ... ...] "__import__('sys').stdout.write(__import__('os').getcwd())" (:output ...))
  ein:kernel-request-stream([cl-struct-ein:$kernel 8888 [object ein:events "ein:events" #s(hash-table size 65 test eq rehash-size 1.5 rehash-threshold 0.8 data (maybe_reset_undo\.Worksheet ... set_next_input\.Worksheet ... set_dirty\.Worksheet ... open_with_text\.Pager ... status_idle\.Kernel ... status_busy\.Kernel ... status_dead\.Kernel ... notebook_saving\.Notebook ... notebook_saved\.Notebook ... notebook_save_failed\.Notebook ... execution_count\.Kernel ... status_restarting\.Kernel ... ...))] "bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" [cl-struct-ein:$websocket [cl-struct-websocket open #1 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell> nil "mIfpALeoarjg7JP8/W9C5g0a40Q=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] [cl-struct-ein:$websocket [cl-struct-websocket open #1 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "YGKj8YOByrL0iQSAr2TIWDcMQVs=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] "/kernels" "/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" "ws://127.0.0.1:8888" t "username" "38e0581a-3a4e-430e-9d4a-0775ef025c8d" #s(hash-table size 65 test equal rehash-size 1.5 rehash-threshold 0.8 data ( ...)) ... ...] "__import__('sys').stdout.write(__import__('os').getcwd())" (lambda ... ...) ([object ein:kernelinfo "ein:kernelinfo" [cl-struct-ein:$kernel 8888 [object ein:events "ein:events" #s(hash-table size 65 test eq rehash-size 1.5 rehash-threshold 0.8 data (maybe_reset_undo\.Worksheet ... set_next_input\.Worksheet ... set_dirty\.Worksheet ... open_with_text\.Pager ... status_idle\.Kernel ... status_busy\.Kernel ... status_dead\.Kernel ... notebook_saving\.Notebook ... notebook_saved\.Notebook ... notebook_save_failed\.Notebook ... execution_count\.Kernel ... status_restarting\.Kernel ... ...))] "bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" [cl-struct-ein:$websocket [cl-struct-websocket open #3 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell> nil "mIfpALeoarjg7JP8/W9C5g0a40Q=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] [cl-struct-ein:$websocket [cl-struct-websocket open #3 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "YGKj8YOByrL0iQSAr2TIWDcMQVs=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] "/kernels" "/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" "ws://127.0.0.1:8888" t "username" "38e0581a-3a4e-430e-9d4a-0775ef025c8d" #s(hash-table size 65 test equal rehash-size 1.5 rehash-threshold 0.8 data ( ...)) ... ...] ... unbound unbound]))
  ein:kernelinfo-update-ccwd([object ein:kernelinfo "ein:kernelinfo" [cl-struct-ein:$kernel 8888 [object ein:events "ein:events" #s(hash-table size 65 test eq rehash-size 1.5 rehash-threshold 0.8 data (maybe_reset_undo\.Worksheet ... set_next_input\.Worksheet ... set_dirty\.Worksheet ... open_with_text\.Pager ... status_idle\.Kernel ... status_busy\.Kernel ... status_dead\.Kernel ... notebook_saving\.Notebook ... notebook_saved\.Notebook ... notebook_save_failed\.Notebook ... execution_count\.Kernel ... status_restarting\.Kernel ... ...))] "bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" [cl-struct-ein:$websocket [cl-struct-websocket open #2 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell> nil "mIfpALeoarjg7JP8/W9C5g0a40Q=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] [cl-struct-ein:$websocket [cl-struct-websocket open #2 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "YGKj8YOByrL0iQSAr2TIWDcMQVs=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] "/kernels" "/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" "ws://127.0.0.1:8888" t "username" "38e0581a-3a4e-430e-9d4a-0775ef025c8d" #s(hash-table size 65 test equal rehash-size 1.5 rehash-threshold 0.8 data ( ...)) ... ...] ... unbound unbound])
  ein:kernelinfo-update-all([object ein:kernelinfo "ein:kernelinfo" [cl-struct-ein:$kernel 8888 [object ein:events "ein:events" #s(hash-table size 65 test eq rehash-size 1.5 rehash-threshold 0.8 data (maybe_reset_undo\.Worksheet ... set_next_input\.Worksheet ... set_dirty\.Worksheet ... open_with_text\.Pager ... status_idle\.Kernel ... status_busy\.Kernel ... status_dead\.Kernel ... notebook_saving\.Notebook ... notebook_saved\.Notebook ... notebook_save_failed\.Notebook ... execution_count\.Kernel ... status_restarting\.Kernel ... ...))] "bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" [cl-struct-ein:$websocket [cl-struct-websocket open #2 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell> nil "mIfpALeoarjg7JP8/W9C5g0a40Q=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] [cl-struct-ein:$websocket [cl-struct-websocket open #2 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "YGKj8YOByrL0iQSAr2TIWDcMQVs=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] "/kernels" "/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" "ws://127.0.0.1:8888" t "username" "38e0581a-3a4e-430e-9d4a-0775ef025c8d" #s(hash-table size 65 test equal rehash-size 1.5 rehash-threshold 0.8 data ( ...)) ... ...] ... unbound unbound])
  apply(ein:kernelinfo-update-all [object ein:kernelinfo "ein:kernelinfo" [cl-struct-ein:$kernel 8888 [object ein:events "ein:events" #s(hash-table size 65 test eq rehash-size 1.5 rehash-threshold 0.8 data (maybe_reset_undo\.Worksheet ... set_next_input\.Worksheet ... set_dirty\.Worksheet ... open_with_text\.Pager ... status_idle\.Kernel ... status_busy\.Kernel ... status_dead\.Kernel ... notebook_saving\.Notebook ... notebook_saved\.Notebook ... notebook_save_failed\.Notebook ... execution_count\.Kernel ... status_restarting\.Kernel ... ...))] "bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" [cl-struct-ein:$websocket [cl-struct-websocket open #2 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell> nil "mIfpALeoarjg7JP8/W9C5g0a40Q=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] [cl-struct-ein:$websocket [cl-struct-websocket open #2 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "YGKj8YOByrL0iQSAr2TIWDcMQVs=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] "/kernels" "/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" "ws://127.0.0.1:8888" t "username" "38e0581a-3a4e-430e-9d4a-0775ef025c8d" #s(hash-table size 65 test equal rehash-size 1.5 rehash-threshold 0.8 data ( ...)) ... ...] ... unbound unbound] nil)
  ein:funcall-packed((ein:kernelinfo-update-all . [object ein:kernelinfo "ein:kernelinfo" [cl-struct-ein:$kernel 8888 [object ein:events "ein:events" #s(hash-table size 65 test eq rehash-size 1.5 rehash-threshold 0.8 data (maybe_reset_undo\.Worksheet ... set_next_input\.Worksheet ... set_dirty\.Worksheet ... open_with_text\.Pager ... status_idle\.Kernel ... status_busy\.Kernel ... status_dead\.Kernel ... notebook_saving\.Notebook ... notebook_saved\.Notebook ... notebook_save_failed\.Notebook ... execution_count\.Kernel ... status_restarting\.Kernel ... ...))] "bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" [cl-struct-ein:$websocket [cl-struct-websocket open #3 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell> nil "mIfpALeoarjg7JP8/W9C5g0a40Q=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] [cl-struct-ein:$websocket [cl-struct-websocket open #3 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "YGKj8YOByrL0iQSAr2TIWDcMQVs=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] "/kernels" "/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" "ws://127.0.0.1:8888" t "username" "38e0581a-3a4e-430e-9d4a-0775ef025c8d" #s(hash-table size 65 test equal rehash-size 1.5 rehash-threshold 0.8 data ( ...)) ... ...] ... unbound unbound]))
  mapc(ein:funcall-packed (... ...))
  ein:kernel-run-after-start-hook([cl-struct-ein:$kernel 8888 [object ein:events "ein:events" #s(hash-table size 65 test eq rehash-size 1.5 rehash-threshold 0.8 data (maybe_reset_undo\.Worksheet ... set_next_input\.Worksheet ... set_dirty\.Worksheet ... open_with_text\.Pager ... status_idle\.Kernel ... status_busy\.Kernel ... status_dead\.Kernel ... notebook_saving\.Notebook ... notebook_saved\.Notebook ... notebook_save_failed\.Notebook ... execution_count\.Kernel ... status_restarting\.Kernel ... ...))] "bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" [cl-struct-ein:$websocket [cl-struct-websocket open #1 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell> nil "mIfpALeoarjg7JP8/W9C5g0a40Q=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] [cl-struct-ein:$websocket [cl-struct-websocket open #1 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "YGKj8YOByrL0iQSAr2TIWDcMQVs=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] "/kernels" "/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" "ws://127.0.0.1:8888" t "username" "38e0581a-3a4e-430e-9d4a-0775ef025c8d" #s(hash-table size 65 test equal rehash-size 1.5 rehash-threshold 0.8 data ( ...)) ... ...])
  (progn ...)
  (if ... ...)
  (lambda ... ... ...)(--host-- --kernel-- --channel--)
  apply((lambda ... ... ...) --host-- --kernel-- --channel-- nil)
  (lambda ... ...)()
  apply((lambda ... ...) nil)
  (if it ...)
  (let ... ...)
  (let ... ...)
  (lambda ... ...)([cl-struct-websocket open [cl-struct-ein:$websocket #0 ... nil ein:kernel--ws-closed-callback ... ... nil nil] ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "YGKj8YOByrL0iQSAr2TIWDcMQVs=" nil])
  apply((lambda ... ...) [cl-struct-websocket open [cl-struct-ein:$websocket #0 ... nil ein:kernel--ws-closed-callback ... ... nil nil] ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "YGKj8YOByrL0iQSAr2TIWDcMQVs=" nil])
  (condition-case err ... ...)
  (if websocket-callback-debug-on-error ... ...)
  (let ... ... ...)
  websocket-try-callback(websocket-on-open on-open [cl-struct-websocket open [cl-struct-ein:$websocket #0 ... nil ein:kernel--ws-closed-callback ... ... nil nil] ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "YGKj8YOByrL0iQSAr2TIWDcMQVs=" nil])
  (progn ... ... ...)
  (if ... ...)
  (let ... ... ... ...)
  websocket-outer-filter([cl-struct-websocket open [cl-struct-ein:$websocket #0 ... nil ein:kernel--ws-closed-callback ... ... nil nil] ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "YGKj8YOByrL0iQSAr2TIWDcMQVs=" nil] "HTTP/1.1 101 Switching Protocols
\nUpgrade: websocket
\nConnection: Upgrade
\nSec-WebSocket-Accept: YGKj8YOByrL0iQSAr2TIWDcMQVs=
\n
\n")
  (let ... ...)
  (lambda ... ...)(#<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> "HTTP/1.1 101 Switching Protocols
\nUpgrade: websocket
\nConnection: Upgrade
\nSec-WebSocket-Accept: YGKj8YOByrL0iQSAr2TIWDcMQVs=
\n
\n")

Here's the websocket shell debug:

[WS] Sending handshake, key: CyJnm9p1cLD0jUR4rxaQ7A==, acceptance: mIfpALeoarjg7JP8/W9C5g0a40Q=
[WS] Websocket opened
[WS] Received: HTTP/1.1 101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: mIfpALeoarjg7JP8/W9C5g0a40Q=


[WS] Checking for accept header: Sec-WebSocket-Accept: mIfpALeoarjg7JP8/W9C5g0a40Q=
[WS] Checking for upgrade header
[WS] Checking for connection header
[WS] Sending frame, opcode: text payload: username=
[WS] Sending frame, opcode: text payload: {"header":{"msg_id":"f78b0588-7ea8-4821-b6df-a7a44d2e5568","username":"username","session":"38e0581a-3a4e-430e-9d4a-0775ef025c8d","msg_type":"execute_request"},"metadata":{},"content":{"code":"__import__('sys').stdout.write(__import__('os').getcwd())","silent":true,"user_variables":[],"user_expressions":{},"allow_stdin":false},"parent_header":{}}
[WS] Closing websocket
[WS] State change to deleted

[WS] Sending handshake, key: dSC1ld/DadstRghnU0fezQ==, acceptance: 68PV+c4jKqWUIu78YIKhlzj6bEo=
[WS] Websocket opened
[WS] Received: HTTP/1.1 101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: 68PV+c4jKqWUIu78YIKhlzj6bEo=


[WS] Checking for accept header: Sec-WebSocket-Accept: 68PV+c4jKqWUIu78YIKhlzj6bEo=
[WS] Checking for upgrade header
[WS] Checking for connection header

[tkf]

Please use triple backquotes when pasting backtrace and logs, otherwise they are not readable. I edited your comment above.

You should have two WS logs "shell" and "iopub". You can open them using ein:dev-pop-to-debug-shell and ein:dev-pop-to-debug-iopub. I suppose you pasted shell one. Can you paste the iopub one (or both and backtrace, if you already closed the Emacs process)?

But I don't know what is happning here. websocket-closed error is raised even though websocket-send is called from on-open callback.

Here is a somewhat brute force fix. What happens if you evaluate the following and then open the notebook? Do you still get the error?

(defun ein:kernelinfo-new (kernel get-buffers)
  )

This code just skips extra stuff going on in on-open callback. Normally you should be able to use EIN without steps in this function.

[ebrevdo]

Here's the iopub debug:

[WS] Sending handshake, key: 8CjdFVYxW/zgzfma37hEng==, acceptance: YGKj8YOByrL0iQSAr2TIWDcMQVs=
[WS] Websocket opened
[WS] Received: HTTP/1.1 101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: YGKj8YOByrL0iQSAr2TIWDcMQVs=


[WS] Checking for accept header: Sec-WebSocket-Accept: YGKj8YOByrL0iQSAr2TIWDcMQVs=
[WS] Checking for upgrade header
[WS] Checking for connection header
[WS] Sending frame, opcode: text payload: username=

When I create an empty kernelinfo-new, here's the new backtrace:

Debugger entered--Lisp error: (error "ein:$websocket-onclose accessing a non-ein:$websocket")
  signal(error ("ein:$websocket-onclose accessing a non-ein:$websocket"))
  error("%s accessing a non-%s" ein:$websocket-onclose ein:$websocket)
  (or ... ...)
  (progn ... ...)
  (let ... ...)
  (let ... ...)
  (lambda ... ...)([cl-struct-websocket open nil ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell> nil "KK/EAyM/9UTFGhJjgv4jbrJcFHo=" nil])
  apply((lambda ... ...) [cl-struct-websocket open nil ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell> nil "KK/EAyM/9UTFGhJjgv4jbrJcFHo=" nil])
  (condition-case err ... ...)
  (if websocket-callback-debug-on-error ... ...)
  (let ... ... ...)
  websocket-try-callback(websocket-on-close on-close [cl-struct-websocket open nil ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell> nil "KK/EAyM/9UTFGhJjgv4jbrJcFHo=" nil])
  (if ... nil ...)
  (let ... ... ...)
  (lambda ... ...)(#<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell> "deleted\n")
  kill-buffer(#<buffer  *websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell*>)
  (let ... ... ...)
  websocket-close([cl-struct-websocket open [cl-struct-ein:$websocket #0 ... nil ein:kernel--ws-closed-callback ... ... nil nil] ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell<1>> nil "zYZQQL8oEhePmFXWEgXqCzAONb8=" nil])
  (if ... nil ... ...)
  websocket-ensure-connected([cl-struct-websocket open [cl-struct-ein:$websocket #0 ... nil ein:kernel--ws-closed-callback ... ... nil nil] ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell<1>> nil "zYZQQL8oEhePmFXWEgXqCzAONb8=" nil])
  websocket-send([cl-struct-websocket open [cl-struct-ein:$websocket #0 ... nil ein:kernel--ws-closed-callback ... ... nil nil] ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell<1>> nil "zYZQQL8oEhePmFXWEgXqCzAONb8=" nil] [cl-struct-websocket-frame text "{\"header\":{\"msg_id\":\"ab0ee531-54b5-4436-ae71-e06f2fdfcf90\",\"username\":\"username\",\"session\":\"08cd602f-28c5-4261-bfb4-734f18564c7a\",\"msg_type\":\"execute_request\"},\"metadata\":{},\"content\":{\"code\":\"__import__('sys').path.append('\\/tmp\\/emacs-ipython-notebook\\/lisp\\/')\",\"silent\":true,\"user_variables\":[],\"user_expressions\":{},\"allow_stdin\":false},\"parent_header\":{}}" nil t])
  websocket-send-text([cl-struct-websocket open [cl-struct-ein:$websocket #0 ... nil ein:kernel--ws-closed-callback ... ... nil nil] ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell<1>> nil "zYZQQL8oEhePmFXWEgXqCzAONb8=" nil] "{\"header\":{\"msg_id\":\"ab0ee531-54b5-4436-ae71-e06f2fdfcf90\",\"username\":\"username\",\"session\":\"08cd602f-28c5-4261-bfb4-734f18564c7a\",\"msg_type\":\"execute_request\"},\"metadata\":{},\"content\":{\"code\":\"__import__('sys').path.append('\\/tmp\\/emacs-ipython-notebook\\/lisp\\/')\",\"silent\":true,\"user_variables\":[],\"user_expressions\":{},\"allow_stdin\":false},\"parent_header\":{}}")
  ein:websocket-send([cl-struct-ein:$websocket [cl-struct-websocket open #0 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell<1>> nil "zYZQQL8oEhePmFXWEgXqCzAONb8=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] "{\"header\":{\"msg_id\":\"ab0ee531-54b5-4436-ae71-e06f2fdfcf90\",\"username\":\"username\",\"session\":\"08cd602f-28c5-4261-bfb4-734f18564c7a\",\"msg_type\":\"execute_request\"},\"metadata\":{},\"content\":{\"code\":\"__import__('sys').path.append('\\/tmp\\/emacs-ipython-notebook\\/lisp\\/')\",\"silent\":true,\"user_variables\":[],\"user_expressions\":{},\"allow_stdin\":false},\"parent_header\":{}}")
  (let* ... ... ... ... msg-id)
  (progn ... ...)
  (let* ... ... ...)
  ein:kernel-execute([cl-struct-ein:$kernel 8888 [object ein:events "ein:events" #s(hash-table size 65 test eq rehash-size 1.5 rehash-threshold 0.8 data (maybe_reset_undo\.Worksheet ... set_next_input\.Worksheet ... set_dirty\.Worksheet ... open_with_text\.Pager ... status_idle\.Kernel ... status_busy\.Kernel ... status_dead\.Kernel ... notebook_saving\.Notebook ... notebook_saved\.Notebook ... notebook_save_failed\.Notebook ... execution_count\.Kernel ... status_restarting\.Kernel ... ...))] "bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" [cl-struct-ein:$websocket [cl-struct-websocket open #1 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell<1>> nil "zYZQQL8oEhePmFXWEgXqCzAONb8=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] [cl-struct-ein:$websocket [cl-struct-websocket open #1 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "PFIrL/4DDcV4HC2mYv863yP1J68=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] "/kernels" "/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" "ws://127.0.0.1:8888" t "username" "08cd602f-28c5-4261-bfb4-734f18564c7a" #s(hash-table size 65 test equal rehash-size 1.5 rehash-threshold 0.8 data ( ...)) ... nil] "__import__('sys').path.append('/tmp/emacs-ipython-notebook/lisp/')")
  ein:pytools-add-sys-path([cl-struct-ein:$kernel 8888 [object ein:events "ein:events" #s(hash-table size 65 test eq rehash-size 1.5 rehash-threshold 0.8 data (maybe_reset_undo\.Worksheet ... set_next_input\.Worksheet ... set_dirty\.Worksheet ... open_with_text\.Pager ... status_idle\.Kernel ... status_busy\.Kernel ... status_dead\.Kernel ... notebook_saving\.Notebook ... notebook_saved\.Notebook ... notebook_save_failed\.Notebook ... execution_count\.Kernel ... status_restarting\.Kernel ... ...))] "bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" [cl-struct-ein:$websocket [cl-struct-websocket open #1 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell<1>> nil "zYZQQL8oEhePmFXWEgXqCzAONb8=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] [cl-struct-ein:$websocket [cl-struct-websocket open #1 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "PFIrL/4DDcV4HC2mYv863yP1J68=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] "/kernels" "/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" "ws://127.0.0.1:8888" t "username" "08cd602f-28c5-4261-bfb4-734f18564c7a" #s(hash-table size 65 test equal rehash-size 1.5 rehash-threshold 0.8 data ( ...)) ... nil])
  apply(ein:pytools-add-sys-path [cl-struct-ein:$kernel 8888 [object ein:events "ein:events" #s(hash-table size 65 test eq rehash-size 1.5 rehash-threshold 0.8 data (maybe_reset_undo\.Worksheet ... set_next_input\.Worksheet ... set_dirty\.Worksheet ... open_with_text\.Pager ... status_idle\.Kernel ... status_busy\.Kernel ... status_dead\.Kernel ... notebook_saving\.Notebook ... notebook_saved\.Notebook ... notebook_save_failed\.Notebook ... execution_count\.Kernel ... status_restarting\.Kernel ... ...))] "bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" [cl-struct-ein:$websocket [cl-struct-websocket open #1 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell<1>> nil "zYZQQL8oEhePmFXWEgXqCzAONb8=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] [cl-struct-ein:$websocket [cl-struct-websocket open #1 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "PFIrL/4DDcV4HC2mYv863yP1J68=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] "/kernels" "/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" "ws://127.0.0.1:8888" t "username" "08cd602f-28c5-4261-bfb4-734f18564c7a" #s(hash-table size 65 test equal rehash-size 1.5 rehash-threshold 0.8 data ( ...)) ... nil] nil)
  ein:funcall-packed((ein:pytools-add-sys-path . [cl-struct-ein:$kernel 8888 [object ein:events "ein:events" #s(hash-table size 65 test eq rehash-size 1.5 rehash-threshold 0.8 data (maybe_reset_undo\.Worksheet ... set_next_input\.Worksheet ... set_dirty\.Worksheet ... open_with_text\.Pager ... status_idle\.Kernel ... status_busy\.Kernel ... status_dead\.Kernel ... notebook_saving\.Notebook ... notebook_saved\.Notebook ... notebook_save_failed\.Notebook ... execution_count\.Kernel ... status_restarting\.Kernel ... ...))] "bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" [cl-struct-ein:$websocket [cl-struct-websocket open #2 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell<1>> nil "zYZQQL8oEhePmFXWEgXqCzAONb8=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] [cl-struct-ein:$websocket [cl-struct-websocket open #2 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "PFIrL/4DDcV4HC2mYv863yP1J68=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] "/kernels" "/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" "ws://127.0.0.1:8888" t "username" "08cd602f-28c5-4261-bfb4-734f18564c7a" #s(hash-table size 65 test equal rehash-size 1.5 rehash-threshold 0.8 data ( ...)) ... nil]))
  mapc(ein:funcall-packed (...))
  ein:kernel-run-after-start-hook([cl-struct-ein:$kernel 8888 [object ein:events "ein:events" #s(hash-table size 65 test eq rehash-size 1.5 rehash-threshold 0.8 data (maybe_reset_undo\.Worksheet ... set_next_input\.Worksheet ... set_dirty\.Worksheet ... open_with_text\.Pager ... status_idle\.Kernel ... status_busy\.Kernel ... status_dead\.Kernel ... notebook_saving\.Notebook ... notebook_saved\.Notebook ... notebook_save_failed\.Notebook ... execution_count\.Kernel ... status_restarting\.Kernel ... ...))] "bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" [cl-struct-ein:$websocket [cl-struct-websocket open #1 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell<1>> nil "zYZQQL8oEhePmFXWEgXqCzAONb8=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] [cl-struct-ein:$websocket [cl-struct-websocket open #1 ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "PFIrL/4DDcV4HC2mYv863yP1J68=" nil] ... nil ein:kernel--ws-closed-callback ... ... nil nil] "/kernels" "/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b" "ws://127.0.0.1:8888" t "username" "08cd602f-28c5-4261-bfb4-734f18564c7a" #s(hash-table size 65 test equal rehash-size 1.5 rehash-threshold 0.8 data ( ...)) ... nil])
  (progn ...)
  (if ... ...)
  (lambda ... ... ...)(--host-- --kernel-- --channel--)
  apply((lambda ... ... ...) --host-- --kernel-- --channel-- nil)
  (lambda ... ...)()
  apply((lambda ... ...) nil)
  (if it ...)
  (let ... ...)
  (let ... ...)
  (lambda ... ...)([cl-struct-websocket open [cl-struct-ein:$websocket #0 ... nil ein:kernel--ws-closed-callback ... ... nil nil] ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "PFIrL/4DDcV4HC2mYv863yP1J68=" nil])
  apply((lambda ... ...) [cl-struct-websocket open [cl-struct-ein:$websocket #0 ... nil ein:kernel--ws-closed-callback ... ... nil nil] ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "PFIrL/4DDcV4HC2mYv863yP1J68=" nil])
  (condition-case err ... ...)
  (if websocket-callback-debug-on-error ... ...)
  (let ... ... ...)
  websocket-try-callback(websocket-on-open on-open [cl-struct-websocket open [cl-struct-ein:$websocket #0 ... nil ein:kernel--ws-closed-callback ... ... nil nil] ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "PFIrL/4DDcV4HC2mYv863yP1J68=" nil])
  (progn ... ... ...)
  (if ... ...)
  (let ... ... ... ...)
  websocket-outer-filter([cl-struct-websocket open [cl-struct-ein:$websocket #0 ... nil ein:kernel--ws-closed-callback ... ... nil nil] ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> nil "PFIrL/4DDcV4HC2mYv863yP1J68=" nil] "HTTP/1.1 101 Switching Protocols
\nUpgrade: websocket
\nConnection: Upgrade
\nSec-WebSocket-Accept: PFIrL/4DDcV4HC2mYv863yP1J68=
\n
\n")
  (let ... ...)
  (lambda ... ...)(#<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/iopub> "HTTP/1.1 101 Switching Protocols
\nUpgrade: websocket
\nConnection: Upgrade
\nSec-WebSocket-Accept: PFIrL/4DDcV4HC2mYv863yP1J68=
\n
\n")

[tkf]

Ah, so that was not enough. How about this:

(defun ein:kernel-run-after-start-hook (kernel))

[ebrevdo]

Redefined both and here's the new backtrace:

Debugger entered--Lisp error: (error "ein:$websocket-onopen accessing a non-ein:$websocket")
  signal(error ("ein:$websocket-onopen accessing a non-ein:$websocket"))
  error("%s accessing a non-%s" ein:$websocket-onopen ein:$websocket)
  (or ... ...)
  (progn ... ...)
  (let ... ...)
  (let ... ...)
  (lambda ... ...)([cl-struct-websocket open nil ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell> nil "FVB2Rp+Yp1Xvf1OInAl3GFoxthw=" nil])
  apply((lambda ... ...) [cl-struct-websocket open nil ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell> nil "FVB2Rp+Yp1Xvf1OInAl3GFoxthw=" nil])
  (condition-case err ... ...)
  (if websocket-callback-debug-on-error ... ...)
  (let ... ... ...)
  websocket-try-callback(websocket-on-open on-open [cl-struct-websocket open nil ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell> nil "FVB2Rp+Yp1Xvf1OInAl3GFoxthw=" nil])
  (progn ... ... ...)
  (if ... ...)
  (let ... ... ... ...)
  websocket-outer-filter([cl-struct-websocket open nil ... ... ... websocket-default-error-handler nil nil nil "ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell" nil nil #<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell> nil "FVB2Rp+Yp1Xvf1OInAl3GFoxthw=" nil] "HTTP/1.1 101 Switching Protocols
\nUpgrade: websocket
\nConnection: Upgrade
\nSec-WebSocket-Accept: FVB2Rp+Yp1Xvf1OInAl3GFoxthw=
\n
\n")
  (let ... ...)
  (lambda ... ...)(#<process websocket to ws://127.0.0.1:8888/kernels/bbbb69e9-11e1-4b50-ae1d-97f829d6a06b/shell> "HTTP/1.1 101 Switching Protocols
\nUpgrade: websocket
\nConnection: Upgrade
\nSec-WebSocket-Accept: FVB2Rp+Yp1Xvf1OInAl3GFoxthw=
\n
\n")

[ebrevdo]

After debugging a bit more, it looks like the port I was connected to (8888) was owned by a zombie ipython notebook that was not associated with my uid (which is why I didn't see it earlier). After killing it, all the problems go away. I can use ein in my standard emacs environment with no issue whatsoever. Using ipython notebook --pylab inline works fine too.

Sorry for creating so much trouble! I wonder if the existing debug messages are sufficient to identify when the issue is on the server side? Will close this bug now.

[tkf]

Well, I learned some lessons and reflected them to the bug report template: 7f17f3b