JuliaLang
Julia 1.12.0-beta4 crash on Oxygen serve & CTRL+C
This is working on Julia 1.11, therefore I assume there is an issue in Julia (tested on Windows). Im using Juliaup to install Julia. The bug report includes usage of Oxygen (1.7.1), I posting here though as the bug only happens on Julia 1.12 .
First about my machine
julia> versioninfo()
Julia Version 1.12.0-beta4
Commit 600ac61d3d (2025-06-05 07:03 UTC)
Build Info:
Official https://julialang.org release
Platform Info:
OS: Windows (x86_64-w64-mingw32)
CPU: 16 × 11th Gen Intel(R) Core(TM) i9-11900H @ 2.50GHz
WORD_SIZE: 64
LLVM: libLLVM-18.1.7 (ORCJIT, tigerlake)
GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 16 virtual cores)
Minimal example:
julia> using Oxygen
julia> serve()
Then hit CTRL+C .
On Julia 1.12 this crashed the REPL with this error message.
julia> Unhandled Task ERROR: TaskFailedException
Stacktrace:
[1] #wait#583
@ .\task.jl:363 [inlined]
[2] wait
@ .\task.jl:360 [inlined]
[3] fetch
@ .\task.jl:525 [inlined]
[4] prompt!(term::REPL.Terminals.TextTerminal, prompt::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
@ REPL.LineEdit C:\Users\dengl\.julia\juliaup\julia-1.12.0-beta4+0.x64.w64.mingw32\share\julia\stdlib\v1.12\REPL\src\LineEdit.jl:2983
[5] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
@ REPL.LineEdit C:\Users\dengl\.julia\juliaup\julia-1.12.0-beta4+0.x64.w64.mingw32\share\julia\stdlib\v1.12\REPL\src\LineEdit.jl:2849
[6] run_frontend(repl::REPL.LineEditREPL, backend::REPL.REPLBackendRef)
@ REPL C:\Users\dengl\.julia\juliaup\julia-1.12.0-beta4+0.x64.w64.mingw32\share\julia\stdlib\v1.12\REPL\src\REPL.jl:1664
[7] (::REPL.var"#61#62"{REPL.LineEditREPL, REPL.REPLBackendRef})()
@ REPL C:\Users\dengl\.julia\juliaup\julia-1.12.0-beta4+0.x64.w64.mingw32\share\julia\stdlib\v1.12\REPL\src\REPL.jl:651
nested task error: InterruptException:
Stacktrace:
[1] yieldto(t::Task, x::Any)
@ Base .\task.jl:1101
[2] yieldto
@ .\task.jl:1095 [inlined]
[3] wait()
@ Base .\task.jl:1213
[4] wait(c::Base.GenericCondition{Base.Threads.SpinLock}; first::Bool)
@ Base .\condition.jl:141
[5] wait
@ .\condition.jl:136 [inlined]
[6] wait_readnb(x::Base.TTY, nb::Int64)
@ Base .\stream.jl:416
[7] eof(s::Base.TTY)
@ Base .\stream.jl:106
[8] eof(io::REPL.Terminals.TTYTerminal)
@ Base .\io.jl:472
[9] (::REPL.LineEdit.var"#prompt!##2#prompt!##3"{REPL.Terminals.TTYTerminal, REPL.LineEdit.ModalInterface, REPL.LineEdit.MIState, REPL.LineEdit.Prompt})()
@ REPL.LineEdit C:\Users\dengl\.julia\juliaup\julia-1.12.0-beta4+0.x64.w64.mingw32\share\julia\stdlib\v1.12\REPL\src\LineEdit.jl:2948
ERROR: TaskFailedException
Stacktrace:
[1] try_yieldto(undo::typeof(Base.ensure_rescheduled))
@ Base .\task.jl:1128
[2] wait()
@ Base .\task.jl:1225
[3] wait(c::Base.GenericCondition{ReentrantLock}; first::Bool)
@ Base .\condition.jl:141
[4] wait
@ .\condition.jl:136 [inlined]
[5] take_buffered(c::Channel{Any})
@ Base .\channels.jl:532
[6] take!
@ .\channels.jl:526 [inlined]
[7] repl_backend_loop(backend::REPL.REPLBackend, get_module::Function)
@ REPL C:\Users\dengl\.julia\juliaup\julia-1.12.0-beta4+0.x64.w64.mingw32\share\julia\stdlib\v1.12\REPL\src\REPL.jl:438
[8] start_repl_backend(backend::REPL.REPLBackend, consumer::Any; get_module::Function)
@ REPL C:\Users\dengl\.julia\juliaup\julia-1.12.0-beta4+0.x64.w64.mingw32\share\julia\stdlib\v1.12\REPL\src\REPL.jl:428
[9] start_repl_backend
@ C:\Users\dengl\.julia\juliaup\julia-1.12.0-beta4+0.x64.w64.mingw32\share\julia\stdlib\v1.12\REPL\src\REPL.jl:425 [inlined]
[10] run_repl(repl::REPL.AbstractREPL, consumer::Any; backend_on_current_task::Bool, backend::Any)
@ REPL C:\Users\dengl\.julia\juliaup\julia-1.12.0-beta4+0.x64.w64.mingw32\share\julia\stdlib\v1.12\REPL\src\REPL.jl:654
[11] run_repl(repl::REPL.AbstractREPL, consumer::Any)
@ REPL C:\Users\dengl\.julia\juliaup\julia-1.12.0-beta4+0.x64.w64.mingw32\share\julia\stdlib\v1.12\REPL\src\REPL.jl:640
[12] run_std_repl(REPL::Module, quiet::Bool, banner::Symbol, history_file::Bool)
@ Base .\client.jl:482
[13] run_main_repl(interactive::Bool, quiet::Bool, banner::Symbol, history_file::Bool)
@ Base .\client.jl:503
[14] repl_main
@ .\client.jl:590 [inlined]
[15] _start()
@ Base .\client.jl:565
nested task error: TaskFailedException
Stacktrace:
[1] #wait#583
@ .\task.jl:363 [inlined]
[2] wait
@ .\task.jl:360 [inlined]
[3] fetch
@ .\task.jl:525 [inlined]
[4] prompt!(term::REPL.Terminals.TextTerminal, prompt::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
@ REPL.LineEdit C:\Users\dengl\.julia\juliaup\julia-1.12.0-beta4+0.x64.w64.mingw32\share\julia\stdlib\v1.12\REPL\src\LineEdit.jl:2983
[5] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
@ REPL.LineEdit C:\Users\dengl\.julia\juliaup\julia-1.12.0-beta4+0.x64.w64.mingw32\share\julia\stdlib\v1.12\REPL\src\LineEdit.jl:2849
[6] run_frontend(repl::REPL.LineEditREPL, backend::REPL.REPLBackendRef)
@ REPL C:\Users\dengl\.julia\juliaup\julia-1.12.0-beta4+0.x64.w64.mingw32\share\julia\stdlib\v1.12\REPL\src\REPL.jl:1664
[7] (::REPL.var"#61#62"{REPL.LineEditREPL, REPL.REPLBackendRef})()
@ REPL C:\Users\dengl\.julia\juliaup\julia-1.12.0-beta4+0.x64.w64.mingw32\share\julia\stdlib\v1.12\REPL\src\REPL.jl:651
nested task error: InterruptException:
Stacktrace:
[1] yieldto(t::Task, x::Any)
@ Base .\task.jl:1101
[2] yieldto
@ .\task.jl:1095 [inlined]
[3] wait()
@ Base .\task.jl:1213
[4] wait(c::Base.GenericCondition{Base.Threads.SpinLock}; first::Bool)
@ Base .\condition.jl:141
[5] wait
@ .\condition.jl:136 [inlined]
[6] wait_readnb(x::Base.TTY, nb::Int64)
@ Base .\stream.jl:416
[7] eof(s::Base.TTY)
@ Base .\stream.jl:106
[8] eof(io::REPL.Terminals.TTYTerminal)
@ Base .\io.jl:472
[9] (::REPL.LineEdit.var"#prompt!##2#prompt!##3"{REPL.Terminals.TTYTerminal, REPL.LineEdit.ModalInterface, REPL.LineEdit.MIState, REPL.LineEdit.Prompt})()
@ REPL.LineEdit C:\Users\dengl\.julia\juliaup\julia-1.12.0-beta4+0.x64.w64.mingw32\share\julia\stdlib\v1.12\REPL\src\LineEdit.jl:2948
That's unfortunately not weird. You sent an asynchronous exception to your program, which can and did cause the scheduler to get in a bad state. So not much that can be done. Not sure if we want to close this but there's around 15 other issues that observe this so I'll take this off the milestone. If someone wants to bisect this then maybe we can change this slightly
This was not an issue in previous Julia versions, why do you believe there is not much that can be done? I assume this is a bug and it needs fixing?
This is a bug and should be fixed. But it's not release blocking. It's one of several issues with ctrl-c handling (just search for ctrl-c in the issue tracker). The fact that this used to work and doesn't doesn't mean that there wasn't an underlying bug before that's still there and is now exposed differently
This is caused by https://github.com/JuliaLang/julia/pull/57544#issuecomment-2978227885 which is new in 1.12. This change basically makes 1.12 guaranteed to get corrupted by ^C, whereas before there was at least a chance this worked. I think this is bad enough that it needs to be on the milestone.
We don't, but even if we did that, that would just result in us swallowing all InterruptExceptions.
IJulia is also affected by this, on 1.12 notebook() and jupyterlab() will completely crash Julia when hitting Ctrl + C to stop the notebook server. Relevant code is here: https://github.com/JuliaLang/IJulia.jl/blob/b4d91ee86972601c2082f0d5a14830000cf8c5f1/src/jupyter.jl#L61
@denglerchr and/or @JamesWrigley: could I ask you to try out this fix and let us know if it returns the old behavior?
Yep, I ran notebook() a few times and it seems to work:
julia> versioninfo()
Julia Version 1.13.0-DEV.751
Commit b4e747c5396* (2025-06-17 18:54 UTC)
Platform Info:
OS: Linux (x86_64-redhat-linux)
CPU: 12 × Intel(R) Core(TM) i7-10850H CPU @ 2.70GHz
WORD_SIZE: 64
LLVM: libLLVM-20.1.2 (ORCJIT, skylake)
GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 12 virtual cores)
Environment:
LD_LIBRARY_PATH = :/opt/zfp/lib64:/opt/adios2/lib:/usr/lib64/openmpi/lib:/usr/local/lib
JULIA_EDITOR = vim
Hello, Im not sure how to test this tbh. Can I just take nightly Julia or do I need to build it or...? Sorry, Im not that deep into it I guess.
Typically you can download the built binary from CI with juliaup add pr58765, but the build failed for that PR for my platform so I ended up checking out the kp-reduce-sched-task branch from git and building it locally.
Just adding my comment that this is very serious in my opinion.
Ctrl-C to interrupt an infinite loop in the REPL crashes Julia 1.12.
MWE session
$ julia +1.12
_
_ _ _(_)_ | Documentation: https://docs.julialang.org
(_) | (_) (_) |
_ _ _| |_ __ _ | Type "?" for help, "]?" for Pkg help.
| | | | | | |/ _` | |
| | |_| | | | (_| | | Version 1.12.0-beta4 (2025-06-05)
_/ |\__'_|_|_|\__'_| | Official https://julialang.org release
|__/ |
julia> versioninfo()
Julia Version 1.12.0-beta4
Commit 600ac61d3d2 (2025-06-05 07:03 UTC)
Build Info:
Official https://julialang.org release
Platform Info:
OS: macOS (arm64-apple-darwin24.0.0)
CPU: 8 × Apple M2
WORD_SIZE: 64
LLVM: libLLVM-18.1.7 (ORCJIT, apple-m2)
GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 4 virtual cores)
Environment:
JULIA_EDITOR = subl
JULIA_SHELL = zsh
julia> function a()
while true
sleep(0.02)
end
end
a (generic function with 1 method)
julia> a()
^CERROR: InterruptException:
Stacktrace:
[1] try_yieldto(undo::typeof(identity))
atal: error thrown and no exception handler available.
InterruptException()k, x::Any)
yieldto at ./task.jl:1101
yieldto at ./task.jl:1095 [inlined]
wait at ./task.jl:1213inlined]
uv_write at ./stream.jl:1080
unsafe_write at ./stream.jl:1153
write at ./strings/io.jl:246 [inlined]se.Threads.SpinLock}; first::Bool)
print at ./strings/io.jl:248 [inlined]
#with_output_color#849 at ./util.jl:112
with_output_color at ./util.jl:73 [inlined]
#printstyled#850 at ./util.jl:141 [inlined]
printstyled at ./util.jl:141 [inlined]
display_error at ./client.jl:109
unknown function (ip: 0x111dd8337) at (unknown file)
display_error at ./client.jl:113
unknown function (ip: 0x111dc010f) at (unknown file)
jl_apply at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-HL2F7YQ3XH.0/build/default-honeycrisp-HL2F7YQ3XH-0/julialang/julia-release-1-dot-12/src/./julia.h:2369 [inlined]
jl_f_invokelatest at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-HL2F7YQ3XH.0/build/default-honeycrisp-HL2F7YQ3XH-0/julialang/julia-release-1-dot-12/src/builtins.c:854
_start at ./client.jl:571
jfptr__start_59543.1 at /Users/josephwilson/.julia/juliaup/julia-1.12.0-beta4+0.aarch64.apple.darwin14/lib/julia/sys.dylib (unknown line)
jl_apply at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-HL2F7YQ3XH.0/build/default-honeycrisp-HL2F7YQ3XH-0/julialang/julia-release-1-dot-12/src/./julia.h:2369 [inlined]
true_main at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-HL2F7YQ3XH.0/build/default-honeycrisp-HL2F7YQ3XH-0/julialang/julia-release-1-dot-12/src/jlapi.c:959
jl_repl_entrypoint at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-HL2F7YQ3XH.0/build/default-honeycrisp-HL2F7YQ3XH-0/julialang/julia-release-1-dot-12/src/jlapi.c:1126
39m ./task.jl:1095 [inlined]
[3] wait()rm::REPL.Terminals.TextTerminal, prompt::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
@ Base ./task.jl:1213juliaup/julia-1.12.0-beta4+0.aarch64.apple.darwin14/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:2983
[4] wait(c::Base.GenericCondition{Base.Threads.SpinLock}; first::Bool)ModalInterface, s::REPL.LineEdit.MIState)
@ Base ./condition.jl:141aup/julia-1.12.0-beta4+0.aarch64.apple.darwin14/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:2849
[5] waittend(repl::REPL.LineEditREPL, backend::REPL.REPLBackendRef)
@ ./condition.jl:136 [inlined].0-beta4+0.aarch64.apple.darwin14/share/julia/stdlib/v1.12/REPL/src/REPL.jl:1664
[6] wait_readnb(x::Base.TTY, nb::Int64)REPL.REPLBackendRef})()
@ Base ./stream.jl:416lia-1.12.0-beta4+0.aarch64.apple.darwin14/share/julia/stdlib/v1.12/REPL/src/REPL.jl:651
[7] eof(s::Base.TTY)
@ Base ./stream.jl:106uptException:
[8] eof(io::REPL.Terminals.TTYTerminal)
@ Base ./io.jl:472 x::Any)
[9] (::REPL.LineEdit.var"#prompt!##2#prompt!##3"{REPL.Terminals.TTYTerminal, REPL.LineEdit.ModalInterface, REPL.LineEdit.MIState, REPL.LineEdit.Prompt})()
@ REPL.LineEdit ~/.julia/juliaup/julia-1.12.0-beta4+0.aarch64.apple.darwin14/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:2948
ERROR:
$ (back to shell)
Cant even segfault Julia anymore:
julia> 1^CInternal Task ERROR: InterruptException:
Stacktrace:
[1] wait()
@ Base ./task.jl:1217
[2] wait_forever()
@ Base ./task.jl:1139
^CInternal Task ERROR: InterruptException:
Stacktrace:
[1] wait()
@ Base ./task.jl:1217
[2] wait_forever()
@ Base ./task.jl:1139
^CInternal Task ERROR: InterruptException:
Stacktrace:
[1] wait()
@ Base ./task.jl:1217
[2] wait_forever()
@ Base ./task.jl:1139
^CInternal Task ERROR: InterruptException:
Stacktrace:
[1] wait()
@ Base ./task.jl:1217
[2] wait_forever()
@ Base ./task.jl:1139
^CInternal Task ERROR: InterruptException:
Happens all the time
Testing Running tests...
^CInternal Task ERROR: InterruptException:
Stacktrace:
[1] wait()
@ Base ./task.jl:1217
[2] wait_forever()
@ Base ./task.jl:1139
Internal Task ERROR: InterruptException:
Stacktrace:
[1] wait()
@ Base ./task.jl:1217
[2] wait_forever()
@ Base ./task.jl:1139
^CInternal Task ERROR: InterruptException:
Stacktrace:
[1] wait()
@ Base ./task.jl:1217
[2] wait_forever()
@ Base ./task.jl:1139
Unhandled Task ERROR: InterruptException:
Stacktrace:
[1] curl_multi_socket_action
@ ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.13/Downloads/src/Curl/Curl.jl:51 [inlined]
[2] curl_multi_socket_action
@ ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.13/Downloads/src/Curl/Curl.jl:59 [inlined]
[3] macro expansion
@ ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.13/Downloads/src/Curl/utils.jl:51 [inlined]
[4] (::Downloads.Curl.var"#socket_callback##8#socket_callback##9"{UInt8, Int32, FileWatching.FDWatcher, Downloads.Curl.Multi})()
@ Downloads.Curl ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.13/Downloads/src/Curl/Multi.jl:200
[5] lock(f::Downloads.Curl.var"#socket_callback##8#socket_callback##9"{UInt8, Int32, FileWatching.FDWatcher, Downloads.Curl.Multi}, l::ReentrantLock)
@ Base ./lock.jl:335
[6] (::Downloads.Curl.var"#socket_callback##6#socket_callback##7"{Int32, FileWatching.FDWatcher, Downloads.Curl.Multi})()
@ Downloads.Curl ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.13/Downloads/src/Curl/Multi.jl:198
^CInternal Task ERROR: InterruptException:
Stacktrace:
[1] wait()
@ Base ./task.jl:1217
[2] wait_forever()
@ Base ./task.jl:1139
Internal Task ERROR: InterruptException:
Stacktrace:
[1] wait()
@ Base ./task.jl:1217
[2] wait_forever()
@ Base ./task.jl:1139