# Julia : strange (Windows) cygwin/mintty hang
**URL:** https://discourse.julialang.org/t/julia-strange-windows-cygwin-mintty-hang/128155
**Category:** General Usage
**Created:** [April 17, 2025, 7:51am UTC](https://discourse.julialang.org/t/julia-strange-windows-cygwin-mintty-hang/128155 "2025-04-17T07:51:15Z")
**Posts on this page:** 11
**Page:** 1
### Author:  [@jdad](https://discourse.julialang.org/u/jdad)
#### Post date: [April 17, 2025, 7:51am UTC](https://discourse.julialang.org/t/julia-strange-windows-cygwin-mintty-hang/128155/1 "2025-04-17T07:51:15Z")
Hello,
Since yesterday I encounter a very strange hang-up of Julia interactive repl under Cygwin/mintty : no response to my typing until I hit Ctrl-C. Then it dump with following results (see later) where I see that what I typed (“aaaaa” here) coming out at the cygwin prompt..
What is curious is that if I launch Julia in the same mintty window, but under a cmd sub-shell, it works correctly. If I use Terminal, it also works . It I launch it directly through the (Windows, pure) installed icon, it works.
Continuing on cygwin, if I use xterm, or konsole, I have the same result : julia (repl) launched from bash prompt hangs, but works when launched from a cmd sub-shell.
The only change I had was an upgrade of Win11 yesterday?
What could be the reason ?
Here is the stacktrace
```julia
julia> Unhandled Task ERROR: TaskFailedException
Stacktrace:
[1] wait(t::Task)
@ Base .\task.jl:370
[2] fetch
@ .\task.jl:390 [inlined]
[3] prompt!(term::REPL.Terminals.TextTerminal, prompt::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
@ REPL.LineEdit C:\Users\davidj\.julia\juliaup\julia-1.11.5+0.x64.w64.mingw32\share\julia\stdlib\v1.11\REPL\src\LineEdit.jl:2884
[4] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
@ REPL.LineEdit C:\Users\davidj\.julia\juliaup\julia-1.11.5+0.x64.w64.mingw32\share\julia\stdlib\v1.11\REPL\src\LineEdit.jl:2750
[5] run_frontend(repl::REPL.LineEditREPL, backend::REPL.REPLBackendRef)
@ REPL C:\Users\davidj\.julia\juliaup\julia-1.11.5+0.x64.w64.mingw32\share\julia\stdlib\v1.11\REPL\src\REPL.jl:1506
[6] (::REPL.var"#79#85"{REPL.LineEditREPL, REPL.REPLBackendRef})()
@ REPL C:\Users\davidj\.julia\juliaup\julia-1.11.5+0.x64.w64.mingw32\share\julia\stdlib\v1.11\REPL\src\REPL.jl:497
nested task error: InterruptException:
Stacktrace:
[1] poptask(W::Base.IntrusiveLinkedListSynchronized{Task})
@ Base .\task.jl:1012
[2] wait()
@ Base .\task.jl:1021
[3] wait(c::Base.GenericCondition{Base.Threads.SpinLock}; first::Bool)
@ Base .\condition.jl:130
[4] wait
@ .\condition.jl:125 [inlined]
[5] wait_readnb(x::Base.TTY, nb::Int64)
@ Base .\stream.jl:416
[6] eof(s::Base.TTY)
@ Base .\stream.jl:106
[7] eof(io::REPL.Terminals.TTYTerminal)
@ Base .\io.jl:472
[8] (::REPL.LineEdit.var"#282#284"{REPL.Terminals.TTYTerminal, REPL.LineEdit.ModalInterface, REPL.LineEdit.MIState, ReentrantLock, REPL.LineEdit.Prompt})()
@ REPL.LineEdit C:\Users\davidj\.julia\juliaup\julia-1.11.5+0.x64.w64.mingw32\share\julia\stdlib\v1.11\REPL\src\LineEdit.jl:2850
ERROR: TaskFailedException
Stacktrace:
[1] try_yieldto(undo::typeof(Base.ensure_rescheduled))
@ Base .\task.jl:958
[2] wait()
@ Base .\task.jl:1022
[3] wait(c::Base.GenericCondition{ReentrantLock}; first::Bool)
@ Base .\condition.jl:130
[4] wait
@ .\condition.jl:125 [inlined]
[5] take_buffered(c::Channel{Any})
@ Base .\channels.jl:493
[6] take!
@ .\channels.jl:487 [inlined]
[7] repl_backend_loop(backend::REPL.REPLBackend, get_module::Function)
@ REPL C:\Users\davidj\.julia\juliaup\julia-1.11.5+0.x64.w64.mingw32\share\julia\stdlib\v1.11\REPL\src\REPL.jl:353
[8] start_repl_backend(backend::REPL.REPLBackend, consumer::Any; get_module::Function)
@ REPL C:\Users\davidj\.julia\juliaup\julia-1.11.5+0.x64.w64.mingw32\share\julia\stdlib\v1.11\REPL\src\REPL.jl:343
[9] run_repl(repl::REPL.AbstractREPL, consumer::Any; backend_on_current_task::Bool, backend::Any)
@ REPL C:\Users\davidj\.julia\juliaup\julia-1.11.5+0.x64.w64.mingw32\share\julia\stdlib\v1.11\REPL\src\REPL.jl:500
[10] run_repl(repl::REPL.AbstractREPL, consumer::Any)
@ REPL C:\Users\davidj\.julia\juliaup\julia-1.11.5+0.x64.w64.mingw32\share\julia\stdlib\v1.11\REPL\src\REPL.jl:486
[11] (::Base.var"#1150#1152"{Bool, Symbol, Bool})(REPL::Module)
@ Base .\client.jl:446
[12] #invokelatest#2
@ .\essentials.jl:1055 [inlined]
[13] invokelatest
@ .\essentials.jl:1052 [inlined]
[14] run_main_repl(interactive::Bool, quiet::Bool, banner::Symbol, history_file::Bool, color_set::Bool)
@ Base .\client.jl:430
[15] repl_main
@ .\client.jl:567 [inlined]
[16] _start()
@ Base .\client.jl:541
nested task error: TaskFailedException
Stacktrace:
[1] wait(t::Task)
@ Base .\task.jl:370
[2] fetch
@ .\task.jl:390 [inlined]
[3] prompt!(term::REPL.Terminals.TextTerminal, prompt::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
@ REPL.LineEdit C:\Users\davidj\.julia\juliaup\julia-1.11.5+0.x64.w64.mingw32\share\julia\stdlib\v1.11\REPL\src\LineEdit.jl:2884
[4] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
@ REPL.LineEdit C:\Users\davidj\.julia\juliaup\julia-1.11.5+0.x64.w64.mingw32\share\julia\stdlib\v1.11\REPL\src\LineEdit.jl:2750
[5] run_frontend(repl::REPL.LineEditREPL, backend::REPL.REPLBackendRef)
@ REPL C:\Users\davidj\.julia\juliaup\julia-1.11.5+0.x64.w64.mingw32\share\julia\stdlib\v1.11\REPL\src\REPL.jl:1506
[6] (::REPL.var"#79#85"{REPL.LineEditREPL, REPL.REPLBackendRef})()
@ REPL C:\Users\davidj\.julia\juliaup\julia-1.11.5+0.x64.w64.mingw32\share\julia\stdlib\v1.11\REPL\src\REPL.jl:497
nested task error: InterruptException:
Stacktrace:
[1] poptask(W::Base.IntrusiveLinkedListSynchronized{Task})
@ Base .\task.jl:1012
[2] wait()
@ Base .\task.jl:1021
[3] wait(c::Base.GenericCondition{Base.Threads.SpinLock}; first::Bool)
@ Base .\condition.jl:130
[4] wait
@ .\condition.jl:125 [inlined]
[5] wait_readnb(x::Base.TTY, nb::Int64)
@ Base .\stream.jl:416
[6] eof(s::Base.TTY)
@ Base .\stream.jl:106
[7] eof(io::REPL.Terminals.TTYTerminal)
@ Base .\io.jl:472
[8] (::REPL.LineEdit.var"#282#284"{REPL.Terminals.TTYTerminal, REPL.LineEdit.ModalInterface, REPL.LineEdit.MIState, ReentrantLock, REPL.LineEdit.Prompt})()
@ REPL.LineEdit C:\Users\davidj\.julia\juliaup\julia-1.11.5+0.x64.w64.mingw32\share\julia\stdlib\v1.11\REPL\src\LineEdit.jl:2850
davidj@vivoaiw ~$ aaaaaaaaaaaa
```
---
### Author:  [@dqeeq](https://discourse.julialang.org/u/dqeeq)
#### Post date: [April 17, 2025, 2:44pm UTC](https://discourse.julialang.org/t/julia-strange-windows-cygwin-mintty-hang/128155/2 "2025-04-17T14:44:57Z")
I would consider testing with julia v1.10.9, just to make sure the bug is not related to julia v1.11.5
---
### Author:  [@jdad](https://discourse.julialang.org/u/jdad)
#### Post date: [April 17, 2025, 5:15pm UTC](https://discourse.julialang.org/t/julia-strange-windows-cygwin-mintty-hang/128155/3 "2025-04-17T17:15:34Z")
Tested, same result. Every Julia version (lets,1.11,1.12,nightly) now do not read what I type at keyboard … except Ctrl-C. And only under bash-cygwin
---
### Author:  [@PetrKryslUCSD](https://discourse.julialang.org/u/PetrKryslUCSD)
#### Post date: [April 17, 2025, 11:35pm UTC](https://discourse.julialang.org/t/julia-strange-windows-cygwin-mintty-hang/128155/4 "2025-04-17T23:35:14Z")
I can’t confirm.
---
### Author:  [@PetrKryslUCSD](https://discourse.julialang.org/u/PetrKryslUCSD)
#### Post date: [April 17, 2025, 11:53pm UTC](https://discourse.julialang.org/t/julia-strange-windows-cygwin-mintty-hang/128155/5 "2025-04-17T23:53:12Z")
What did you upgrade to?
---
### Author:  [@jdad](https://discourse.julialang.org/u/jdad)
#### Post date: [April 18, 2025, 8:10am UTC](https://discourse.julialang.org/t/julia-strange-windows-cygwin-mintty-hang/128155/6 "2025-04-18T08:10:53Z")
I had automatic `Windows Update : cumulative update for Windows 11 version 24H2 for x64 systems (KB5055523)` (translated from French).
I have just received today another automatic update (KB5007651 / for security platform) that I will accept later in the day - situation cannot change in more bad?
---
### Author:  [@jdad](https://discourse.julialang.org/u/jdad)
#### Post date: [April 18, 2025, 8:15am UTC](https://discourse.julialang.org/t/julia-strange-windows-cygwin-mintty-hang/128155/7 "2025-04-18T08:15:16Z")
What is completely strange for me is that is only under mintty (or cygwin-sublaunched under mintty kde-konsole or xterm). When I launch Cygwin.bat under Windows Terminal it works. And in non-repl mode Julia works also ok.
---
### Author:  [@jdad](https://discourse.julialang.org/u/jdad)
#### Post date: [April 18, 2025, 8:22am UTC](https://discourse.julialang.org/t/julia-strange-windows-cygwin-mintty-hang/128155/8 "2025-04-18T08:22:59Z")
Update. Launching Cygwin.bat inside Windows terminal, I get a bash login prompt where Julia repl works. If then I launch a konsole,xterm or mintty inside this Terminal, the Julia repl does catch input inside the new window.
I am totally baffled.
---
### Author:  [@jdad](https://discourse.julialang.org/u/jdad)
#### Post date: [April 18, 2025, 8:35am UTC](https://discourse.julialang.org/t/julia-strange-windows-cygwin-mintty-hang/128155/9 "2025-04-18T08:35:34Z")
Seems more and more a specific Cygwin issue? But what? Related to X11 application? (as it happens only inside cygwin x11-terminal apps)?
I effectively add a Cygwin update a few days ago, (I see in the logs that the `cygwin` package did upgrade from 3.5.7-1 to 3.6.1-1, and also xkeyboard-config, cygutils-x11 and others), could it be that ?
I can’t understand interaction between keyboard input and Julia could have been changed - that is, only for Julia.
---
### Author:  [@PetrKryslUCSD](https://discourse.julialang.org/u/PetrKryslUCSD)
#### Post date: [April 18, 2025, 1:30pm UTC](https://discourse.julialang.org/t/julia-strange-windows-cygwin-mintty-hang/128155/10 "2025-04-18T13:30:59Z")
My mintty window is created by git-bash.exe. I haven’t tried x11.
---
### Author:  [@jdad](https://discourse.julialang.org/u/jdad)
#### Post date: [April 19, 2025, 8:24am UTC](https://discourse.julialang.org/t/julia-strange-windows-cygwin-mintty-hang/128155/11 "2025-04-19T08:24:58Z")
It was Cygwin. Seems the cygwin DLL v3.6.x (now 3.6.1) changes the (console? keyboard ?) input management
[https://cygwin.com/pipermail/cygwin-announce/2025-February/012157.html](https://cygwin.com/pipermail/cygwin-announce/2025-February/012157.html)
[https://cygwin.com/pipermail/cygwin-announce/2025-April/012266.html](https://cygwin.com/pipermail/cygwin-announce/2025-April/012266.html).
I just changed back the DLL to `cygwin-3.5.7` and all is working normally as before.
Hope the Cygwin people will address the glitch soon (seems other apps had similar, if not identical, issues).