QML errors on Ubuntu aarch64

[JanisErdmanis]

I have Ubuntu aarch64 installed through Parallels Desktop and noticed an error when launching a simple QML application on this platform:

julia> include("main.jl")
ERROR: LoadError: InitError: type RefArray has no field cpp_object
Stacktrace:
  [1] getproperty
    @ ./Base.jl:49 [inlined]
  [2] unsafe_convert(to_type::Type{CxxWrap.CxxWrapCore.CxxPtr{…}}, x::Base.RefArray{Ptr{…}, Vector{…}, Vector{…}})
    @ CxxWrap.CxxWrapCore ~/.julia/packages/CxxWrap/eWADG/src/CxxWrap.jl:294
  [3] getargv(a::QML.ArgcArgv)
    @ QML ~/.julia/packages/QML/SeDxf/src/QML.jl:158
  [4] __init__()
    @ QML ~/.julia/packages/QML/SeDxf/src/QML.jl:181
  [5] run_module_init(mod::Module, i::Int64)
    @ Base ./loading.jl:1262
  [6] register_restored_modules(sv::Core.SimpleVector, pkg::Base.PkgId, path::String)
    @ Base ./loading.jl:1250
  [7] _include_from_serialized(pkg::Base.PkgId, path::String, ocachepath::String, depmods::Vector{…}, ignore_native::Nothing)
    @ Base ./loading.jl:1195
  [8] _include_from_serialized
    @ ./loading.jl:1152 [inlined]
  [9] _require_search_from_serialized(pkg::Base.PkgId, sourcepath::String, build_id::UInt128, stalecheck::Bool; reasons::Dict{…}, DEPOT_PATH::Vector{…})
    @ Base ./loading.jl:1914
 [10] _require(pkg::Base.PkgId, env::String)
    @ Base ./loading.jl:2346
 [11] __require_prelocked(uuidkey::Base.PkgId, env::String)
    @ Base ./loading.jl:2216
 [12] #invoke_in_world#3
    @ ./essentials.jl:1077 [inlined]
 [13] invoke_in_world
    @ ./essentials.jl:1074 [inlined]
 [14] _require_prelocked(uuidkey::Base.PkgId, env::String)
    @ Base ./loading.jl:2207
 [15] macro expansion
    @ ./loading.jl:2146 [inlined]
 [16] macro expansion
    @ ./lock.jl:273 [inlined]
 [17] __require(into::Module, mod::Symbol)
    @ Base ./loading.jl:2103
 [18] #invoke_in_world#3
    @ ./essentials.jl:1077 [inlined]
 [19] invoke_in_world
    @ ./essentials.jl:1074 [inlined]
 [20] require(into::Module, mod::Symbol)
    @ Base ./loading.jl:2096
 [21] include(fname::String)
    @ Main ./sysimg.jl:38
 [22] top-level scope
    @ REPL[1]:1
during initialization of module QML
in expression starting at /media/psf/Home/Desktop/JuliaCon2024-AppBundler-Demo/QMLApp/main.jl:1
Some type information was truncated. Use `show(err)` to see complete types.

[ufechner7]

On which hardware did you test this? How can it be reproduced?

[JanisErdmanis]

It was tested on Apple silicon via Parallels desktop.

[jonalm]

Could it be that you're using an old version of QML? I got the same errors, see https://github.com/barche/QmlJuliaExamples/issues/14

[JanisErdmanis]

I investigated this case because I had previously overlooked how I had used Manifest.toml between Julia versions. I found that I had QML was fixed at 0.9.0. Removing the old Manifest.toml and instantiating the project fresh with Julia 1.11, where QML is now at 0.9.1, sadly, produces the same error.

[ufechner7]

I would not expect it to work with 1.11-rc . 1.11 is not released yet. Can you repeat the test with Julia 1.10 ?

juliaup install 1.10
juliaup default 1.10

[JanisErdmanis]

I just tried that. The same error is thrown with Julia 1.10.

[JanisErdmanis]

I also reproduced the same error on Raspberry Pi 4 in headless mode. In my opinion, one step forward would be to create an integration test that runs on CI.

[ufechner7]

@barche Do we officially support aarch64? If not we should mention it in the README.md. If we want to support it we need to debug this issue. I have a PI5 for testing, but I do not know if there are any servers that could do the testing on CI.

[barche]

I can't see an obvious reason why it wouldn't work, but I don't have a machine to test it on.

[JanisErdmanis]

@barche, could we add aarch64 to .github/workflows/test.yml, which seems to be left out for Ubuntu?

[kn05]

The same issue occurs on Arch Linux WSL2 environment as well.

julia> include("gui.jl") # Or any of the files in the directory
ERROR: LoadError: InitError: type RefArray has no field cpp_object
Stacktrace:
  [1] getproperty
    @ ./Base.jl:49 [inlined]
  [2] unsafe_convert(to_type::Type{CxxWrap.CxxWrapCore.CxxPtr{…}}, x::Base.RefArray{Ptr{…}, Vector{…}, Vector{…}})
    @ CxxWrap.CxxWrapCore ~/.julia/packages/CxxWrap/5IZvn/src/CxxWrap.jl:271
  [3] getargv(a::QML.ArgcArgv)
    @ QML ~/.julia/packages/QML/ZVeBh/src/QML.jl:133
  [4] __init__()
    @ QML ~/.julia/packages/QML/ZVeBh/src/QML.jl:156
  [5] run_module_init(mod::Module, i::Int64)
    @ Base ./loading.jl:1336
  [6] register_restored_modules(sv::Core.SimpleVector, pkg::Base.PkgId, path::String)
    @ Base ./loading.jl:1324
  [7] _include_from_serialized(pkg::Base.PkgId, path::String, ocachepath::String, depmods::Vector{Any}, ignore_native::Nothing; register::Bool)
    @ Base ./loading.jl:1213
  [8] _include_from_serialized (repeats 2 times)
    @ ./loading.jl:1169 [inlined]
  [9] _require_search_from_serialized(pkg::Base.PkgId, sourcepath::String, build_id::UInt128, stalecheck::Bool; reasons::Dict{…}, DEPOT_PATH::Vector{…})
    @ Base ./loading.jl:1975
 [10] _require(pkg::Base.PkgId, env::String)
    @ Base ./loading.jl:2435
 [11] __require_prelocked(uuidkey::Base.PkgId, env::String)
    @ Base ./loading.jl:2300
 [12] #invoke_in_world#3
    @ ./essentials.jl:1088 [inlined]
 [13] invoke_in_world
    @ ./essentials.jl:1085 [inlined]
 [14] _require_prelocked(uuidkey::Base.PkgId, env::String)
    @ Base ./loading.jl:2287
 [15] macro expansion
    @ ./loading.jl:2226 [inlined]
 [16] macro expansion
    @ ./lock.jl:273 [inlined]
 [17] __require(into::Module, mod::Symbol)
    @ Base ./loading.jl:2183
 [18] #invoke_in_world#3
    @ ./essentials.jl:1088 [inlined]
 [19] invoke_in_world
    @ ./essentials.jl:1085 [inlined]
 [20] require(into::Module, mod::Symbol)
    @ Base ./loading.jl:2176
 [21] include(fname::String)
    @ Main ./sysimg.jl:38
 [22] top-level scope
    @ REPL[5]:1
during initialization of module QML
in expression starting at /home/bellq/project/QmlJuliaExamples/basic/gui.jl:2
Some type information was truncated. Use `show(err)` to see complete types.

[barche]

I tried adding aarch64 for Ubuntu, but it seems the Github CI runners don't support this, it tries to run aarch64 Julia on an x86_64 Ubuntu:

https://github.com/JuliaGraphics/QML.jl/actions/runs/11304271459/job/31442445149?pr=208

[barche]

I have been able to reproduce this on my Raspberry Pi 4. It is a bug in CxxWrap, due to different typing in the C++ argv somehow. Still looking for a solution.

[GaavNa]

I really appreciate your efforts. Were you able to make any progress regarding this issue ? I encounter the exact same error message using Julia 1.11 on Windows 10.

[JanisErdmanis]

@GaavNa, are you running Windows on arm64?

[GaavNa]

@GaavNa, are you running Windows on arm64?

No, Intel. It didn't work on two computer with Intel and Windows.

However, it worked on Debian 12 using an intel CPU.

[JanisErdmanis]

@GaavNa, you should open a separate issue laying out the configuration that could help us reproduce it, along with the Julia version you have used. In my Windows environment, QML works. Thus, such a bug report would be valuable. Also, trying Julia from a fresh start is worthwhile, as I have encountered some binary Artifact locking situations in the past.

[barche]

Still no clear idea on what causes this, I think it's actually a problem in CxxWrap.jl and the convert methods there.

[barche]

I think applying the changes in CxxWrap.jl from this commit will fix this: https://github.com/JuliaInterop/CxxWrap.jl/commit/c9e113c2b128fbd055988fb7c7cff5c213a86c52

You can try this by manually patching the CxxWrap.jl file.

[JanisErdmanis]

I finally had time to test the patch. It works well on my Ubuntu aarch64 VM installation. Is there any reason why the patch is not integrated into CxxWrap?

[barche]

I'm taking far longer than expected for the 0.17 release of CxxWrap, so maybe it is indeed beste to just backport this as a point release in 0.16.

[barche]

Should be OK now!