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Description
The following code causes a segfault for me on Julia v1.11, but not v1.10:
haakon@dhcp-72-242 src % julia --startup=no failure.jl
[18432] signal 11 (2): Segmentation fault: 11
in expression starting at /Users/me/failure.jl:49
_ZL13getSameOpcodeN4llvm8ArrayRefIPNS_5ValueEEERKNS_17TargetLibraryInfoEj at /Users/me/.julia/juliaup/julia-1.11.5+0.aarch64.apple.darwin14/lib/julia/libLLVM.dylib (unknown line)
Allocations: 1 (Pool: 1; Big: 0); GC: 0
zsh: segmentation fault julia --startup=no failure.jl
where failure.jl is:
# failure.jl
struct NestedStruct{FT, I1, I2}
inner1::I1
inner2::I2
a::FT
b::FT
c::FT
d::FT
e::FT
end
function NestedStruct()
inner1 = Inner1(1.0, 1.0, 1.0, 1.0, 1.0)
inner2 = Inner2(1.0)
return NestedStruct{Float64, Inner1{Float64}, Inner2{Float64}}(inner1, inner2, 1.0, 1.0, 1.0, 1.0, 1.0)
end
struct Inner1{FT}
a::FT
b::FT
c::FT
d::FT
e::FT
end
struct Inner2{FT}
n0::FT
end
struct FlatStruct{FT}
a::FT
b::FT
c::FT
function FlatStruct(a::FT, b::FT, c::FT) where {FT}
a_safe = max(a, 0)
b_safe = max(b, 0)
c_safe = max(c, 0)
return new{FT}(a_safe, b_safe, c_safe)
end
end
func(ice_params::NestedStruct, q::FlatStruct) = 0
ns = NestedStruct()
a = 20e-3
c_range = (1e-8, 1e-7)
# FAILS
[func(ns, FlatStruct(a, 0.0, c)) for c in c_range]versioninfo()
julia> versioninfo()
Julia Version 1.11.5
Commit 760b2e5b739 (2025-04-14 06:53 UTC)
Build Info:
Official https://julialang.org/ release
Platform Info:
OS: macOS (arm64-apple-darwin24.0.0)
CPU: 14 × Apple M4 Pro
WORD_SIZE: 64
LLVM: libLLVM-16.0.6 (ORCJIT, apple-m1)
Threads: 10 default, 0 interactive, 5 GC (on 10 virtual cores)
Environment:
JULIA_EDITOR = cursor
JULIA_NUM_THREADS = auto
JULIA_MAX_NUM_PRECOMPILE_FILES = 50A mouthful of a PR title, and I certainly do not claim to understand why this fails. I originally posted this on #helpdesk in the julialang slack (Jun 23 2025, 2:29pm PT). The not simplified version of this code that originally led me to discover this issue can be run if you:
- clone https://github.com/CliMA/CloudMicrophysics.jl
- checkout main (d3a8ae2)
- instantiate the primary project environment
- instantiate the
./docsenvironment (you may need todev .to get the rightCloudMicrophysics.jldependency) - run
julia --startup=no --proj=docs docs/src/plots/Microphysics1M_plots.jl - This fails on L80, specifically:
[CM1.conv_q_ice_to_q_sno(ice, aps, tps, TD.PhasePartition(q_tot, 0.0, q_ice), q_rai, q_sno, ρ_air, T - 5) for q_ice in q_ice_range]