BoPeng
commented
5 years ago Just to clarify, the kernel works all right if users execute an empty cell in a notebook because the frontend will simply skip the cell. The problem happens when an execute_input shell message with an empty code ('code': '') is sent directly to the kernel, in which case the kernel does not respond with an execute_reply message. This does not conform to the Jupyter messaging protocol because an execute_reply message is always expected for execute_input.
cgravill
Description
Attempting integration with SoS notebook and implementing magics according to the SoS standard.
It appears that the IfSharp kernel, unlike other kernels, does not respond to an empty input, which is actually the content of the cell after removing the magic.
Although the SoS maintainer has created a workaround, this bug may manifest in other projects down the line.
Repro steps
It's not clear to me how to repro this without installing SoS and and the sos-fsharp extension.
Using the IfSharp kernel in a vanilla notebook does not repro the behavior.
Expected behavior
A cell with magics executes.
Actual behavior
A cell with magics hangs after execution. In this example, the directory before execution was
/z/aolney/repos/sos-fsharp.Known workarounds
The SoS maintainer has created a workaround
Related information
Distributor ID: Ubuntu Description: Ubuntu 18.04.2 LTS Release: 18.04 Codename: bionic
IfSharp.v3.0.1
Mono JIT compiler version 6.0.0.313 (tarball Sun Jul 14 09:57:59 UTC 2019) Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com TLS: __thread SIGSEGV: altstack Notifications: epoll Architecture: amd64 Disabled: none Misc: softdebug Interpreter: yes LLVM: yes(600) Suspend: hybrid GC: sgen (concurrent by default)