Julia 1.12: Deadlock detected in loading Flux ext #2625
Description
julia> versioninfo()
Julia Version 1.12.0
Commit b907bd0600 (2025-10-07 15:42 UTC)
Build Info:
Official https://julialang.org release
Platform Info:
OS: Windows (x86_64-w64-mingw32)
CPU: 24 × Intel(R) Core(TM) Ultra 9 285
WORD_SIZE: 64
LLVM: libLLVM-18.1.7 (ORCJIT, arrowlake-s)
GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 24 virtual cores)
I think I am running into this same issue: JuliaLang/julia#58045
] activate --temp
add Flux, CUDA, cuDNN
# Backspace here to go out of package mode
import CUDA
import Flux
gives:
┌ Error: Error during loading of extension FluxCUDAcuDNNExt of Flux, use `Base.retry_load_extensions()` to retry.
│ exception =
│ 1-element ExceptionStack:
│ ConcurrencyViolationError("deadlock detected in loading FluxCUDAExt using FluxCUDAExt (while loading FluxCUDAcuDNNExt)")
│ Stacktrace:
│ [1] canstart_loading(modkey::Base.PkgId, build_id::UInt128, stalecheck::Bool)
│ @ Base .\loading.jl:2182
│ [2] _require_search_from_serialized(pkg::Base.PkgId, sourcepath::String, build_id::UInt128, stalecheck::Bool; reasons::Dict{String, Int64}, DEPOT_PATH::Vector{String})
│ @ Base .\loading.jl:2016
│ [3] __require_prelocked(pkg::Base.PkgId, env::Nothing)
│ @ Base .\loading.jl:2599
│ [4] _require_prelocked(uuidkey::Base.PkgId, env::Nothing)
│ @ Base .\loading.jl:2465
│ [5] _require_prelocked(uuidkey::Base.PkgId)
│ @ Base .\loading.jl:2459
│ [6] run_extension_callbacks(extid::Base.ExtensionId)
│ @ Base .\loading.jl:1579
│ [7] run_extension_callbacks(pkgid::Base.PkgId)
│ @ Base .\loading.jl:1616
│ [8] run_package_callbacks(modkey::Base.PkgId)
│ @ Base .\loading.jl:1432
│ [9] _require_prelocked(uuidkey::Base.PkgId, env::String)
│ @ Base .\loading.jl:2473
│ [10] macro expansion
│ @ .\loading.jl:2393 [inlined]
│ [11] macro expansion
│ @ .\lock.jl:376 [inlined]
│ [12] __require(into::Module, mod::Symbol)
│ @ Base .\loading.jl:2358
│ [13] require
│ @ .\loading.jl:2334 [inlined]
│ [14] __init__()
│ @ FluxCUDAExt C:\Users\fschmidt26\.julia\packages\Flux\uRn8o\ext\FluxCUDAExt\FluxCUDAExt.jl:8
│ [15] run_module_init(mod::Module, i::Int64)
│ @ Base .\loading.jl:1415
│ [16] register_restored_modules(sv::Core.SimpleVector, pkg::Base.PkgId, path::String)
│ @ Base .\loading.jl:1403
│ [17] _include_from_serialized(pkg::Base.PkgId, path::String, ocachepath::String, depmods::Vector{Any}; register::Bool)
│ @ Base .\loading.jl:1291
│ [18] _include_from_serialized
│ @ .\loading.jl:1246 [inlined]
│ [19] _require_search_from_serialized(pkg::Base.PkgId, sourcepath::String, build_id::UInt128, stalecheck::Bool; reasons::Dict{String, Int64}, DEPOT_PATH::Vector{String})
│ @ Base .\loading.jl:2087
│ [20] __require_prelocked(pkg::Base.PkgId, env::Nothing)
│ @ Base .\loading.jl:2599
│ [21] _require_prelocked(uuidkey::Base.PkgId, env::Nothing)
│ @ Base .\loading.jl:2465
│ [22] _require_prelocked(uuidkey::Base.PkgId)
│ @ Base .\loading.jl:2459
│ [23] run_extension_callbacks(extid::Base.ExtensionId)
│ @ Base .\loading.jl:1579
│ [24] run_extension_callbacks(pkgid::Base.PkgId)
│ @ Base .\loading.jl:1616
│ [25] run_package_callbacks(modkey::Base.PkgId)
│ @ Base .\loading.jl:1432
│ [26] _require_prelocked(uuidkey::Base.PkgId, env::String)
│ @ Base .\loading.jl:2473
│ [27] macro expansion
│ @ .\loading.jl:2393 [inlined]
│ [28] macro expansion
│ @ .\lock.jl:376 [inlined]
│ [29] __require(into::Module, mod::Symbol)
│ @ Base .\loading.jl:2358
│ [30] require(into::Module, mod::Symbol)
│ @ Base .\loading.jl:2334
│ [31] top-level scope
│ @ REPL[4]:1
│ [32] __repl_entry_eval_expanded_with_loc(mod::Module, ast::Any, toplevel_file::Ref{Ptr{UInt8}}, toplevel_line::Ref{Int32})
│ @ REPL C:\Users\fschmidt26\AppData\Local\Programs\Julia-1.12.0\share\julia\stdlib\v1.12\REPL\src\REPL.jl:301
│ [33] toplevel_eval_with_hooks(mod::Module, ast::Any, toplevel_file::Any, toplevel_line::Any)
│ @ REPL C:\Users\fschmidt26\AppData\Local\Programs\Julia-1.12.0\share\julia\stdlib\v1.12\REPL\src\REPL.jl:308
│ [34] toplevel_eval_with_hooks(mod::Module, ast::Any, toplevel_file::Any, toplevel_line::Any)
│ @ REPL C:\Users\fschmidt26\AppData\Local\Programs\Julia-1.12.0\share\julia\stdlib\v1.12\REPL\src\REPL.jl:312
│ [35] toplevel_eval_with_hooks
│ @ C:\Users\fschmidt26\AppData\Local\Programs\Julia-1.12.0\share\julia\stdlib\v1.12\REPL\src\REPL.jl:305 [inlined]
│ [36] eval_user_input(ast::Any, backend::REPL.REPLBackend, mod::Module)
│ @ REPL C:\Users\fschmidt26\AppData\Local\Programs\Julia-1.12.0\share\julia\stdlib\v1.12\REPL\src\REPL.jl:330
│ [37] repl_backend_loop(backend::REPL.REPLBackend, get_module::Function)
│ @ REPL C:\Users\fschmidt26\AppData\Local\Programs\Julia-1.12.0\share\julia\stdlib\v1.12\REPL\src\REPL.jl:452
│ [38] start_repl_backend(backend::REPL.REPLBackend, consumer::Any; get_module::Function)
│ @ REPL C:\Users\fschmidt26\AppData\Local\Programs\Julia-1.12.0\share\julia\stdlib\v1.12\REPL\src\REPL.jl:427
│ [39] start_repl_backend
│ @ C:\Users\fschmidt26\AppData\Local\Programs\Julia-1.12.0\share\julia\stdlib\v1.12\REPL\src\REPL.jl:424 [inlined]
│ [40] run_repl(repl::REPL.AbstractREPL, consumer::Any; backend_on_current_task::Bool, backend::Any)
│ @ REPL C:\Users\fschmidt26\AppData\Local\Programs\Julia-1.12.0\share\julia\stdlib\v1.12\REPL\src\REPL.jl:653
│ [41] run_repl(repl::REPL.AbstractREPL, consumer::Any)
│ @ REPL C:\Users\fschmidt26\AppData\Local\Programs\Julia-1.12.0\share\julia\stdlib\v1.12\REPL\src\REPL.jl:639
│ [42] run_std_repl(REPL::Module, quiet::Bool, banner::Symbol, history_file::Bool)
│ @ Base .\client.jl:478
│ [43] run_main_repl(interactive::Bool, quiet::Bool, banner::Symbol, history_file::Bool)
│ @ Base .\client.jl:499
│ [44] repl_main
│ @ .\client.jl:586 [inlined]
│ [45] _start()
│ @ Base .\client.jl:561
└ @ Base loading.jl:1589
That issue report suspected this to be the culprit: