1533
93%

Ran 11 Nov 2026 11:24PM UTC

Jobs 3

Files 385

Run time 1min

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Committed 11 Nov 2026 09:29PM UTC coverage: 92.702% (-0.02%) from 92.719%

Build # 1533

Build Type

push

buildkite

Committed by

web-flow

Commit Message

datatype: Fix runtime setonce on 32-bit platforms (#64886)

`jl_atomic_storeonce_bits` picks the width of the compare-and-swap
behind `setfieldonce!` and `memoryrefsetonce!` when the runtime, not
compiled code, stores an inline struct holding a reference into an
atomic field or `AtomicMemory` element. Its `_P64` test was inverted,
so each word size got the other's widths. That is harmless on 64-bit
platforms, where a one-word atomic merely gets a retry loop it does not
need. On 32-bit platforms:

- A one-word struct such as `struct P; x::Any; end` was swapped as 8
  bytes. The store failed whenever the word after the field or element
  was nonzero, and when it succeeded it could write a stray byte into
  that word, which crashed a later read of it.
- A two-word struct got no retry. While its reference is undefined the
  rest of it is whatever the memory held before, so the store failed on
  fresh objects.

The inversion dates from JuliaLang/julia#52868. Compiled code with a
constant ordering was not affected. Found through the i686 jobs of
JuliaLang/julia#62918:
https://buildkite.com/julialang/julia-pr/builds/5888#01a1c9e6-192f-45e2-8b01-9bef7e95c29d

Assisted-by: Claude Code (Fable 5.2)

Coverage Stats

99599 of 107440 relevant lines covered (92.7%)

390.86 hits per line

Coverage Regressions

Lines	Coverage	∆	File
68	92.73	0.1%	Compiler/src/typeinfer.jl
46	91.64	-3.45%	base/shell.jl
35	94.28	-0.46%	stdlib/REPL/src/REPLCompletions.jl
33	96.91	-0.02%	Compiler/src/ssair/inlining.jl
33	92.6	0.0%	base/abstractarray.jl
30	93.03	0.0%	Compiler/src/tfuncs.jl
24	90.51	0.0%	base/loading.jl
20	90.37	-0.2%	base/path.jl
18	89.55	6.07%	JuliaSyntax/src/integration/hooks.jl
13	72.73	6.06%	JuliaSyntax/src/utils.jl
12	91.51	-0.43%	base/abstractdict.jl
7	93.33	-1.94%	base/cancellation.jl
5	76.92	-3.5%	base/Base.jl
3	80.85	-2.13%	base/stat.jl
2	97.6	0.0%	JuliaSyntax/src/julia/literal_parsing.jl
1	88.04	-0.13%	Compiler/src/ssair/EscapeAnalysis.jl
1	85.09	-0.88%	Compiler/src/abstractlattice.jl

Jobs

ID	Job ID	Ran	Files	Coverage
1533	macos - 1533	11 Nov 2026 11:24PM UTC	385	92.13
1533	linux - 1533	12 Nov 2026 01:13AM UTC	385	92.18
1533	windows - 1533	12 Nov 2026 01:30AM UTC	384	90.84

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