Fix potential underrun with annotation merging #54917
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As raised in JuliaLang#54860, when writing to an AnnotatedIOBuffer, should the new content have more annotations than the AnnotatedIOBuffer, we may attempt to index non-existent annotations. This bug occurs in the process of looking for runs of matched annotations. Since it is impossible for a run to be longer than the number of existing annotations, we can add this as a sanity check and not bother trying to check for run lengths where this is not the case. Reported-by: caleb-allen <[email protected]>
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Backported PRs: - [x] #54201 <!-- Fix generic triangular solves with empty matrices --> - [x] #54358 <!-- Create `jl_clear_coverage_data` to dynamically reset coverage --> - [x] #54908 <!-- LazyString in interpolated error messages in threadingconstructs --> - [x] #54952 <!-- LAPACK: Avoid repr call in `chkvalidparam` --> - [x] #54898 <!-- fix concurrent module loading return value --> - [x] #55082 <!-- Add fast method for copyto!(::Memory, ::Memory) --> - [x] #55084 <!-- Use triple quotes in TOML.print when string contains newline --> - [x] #55141 <!-- Update the aarch64 devdocs to reflect the current state of its support --> - [x] #54955 <!-- don't throw EOFError from sleep --> - [x] #54871 <!-- Make warn missed transformations pass optional --> - [x] #55178 <!-- Compat for `Base.@nospecializeinfer` --> - [x] #55197 <!-- compat notice for a[begin] indexing --> - [x] #54917 <!-- Fix potential underrun with annotation merging --> - [x] #55209 <!-- correction to compat notice for a[begin] --> - [x] #55203 <!-- document mutable struct const fields --> - [x] #54791 <!-- Bump libblastrampoline to v5.10.1 --> - [x] #54950 <!-- SuiteSparse: Bump version --> - [x] #54956 <!-- Fix accidental early evaluation of imported `using` binding --> - [x] #54996 <!-- inference: add missing `MustAlias` widening in `_getfield_tfunc` --> - [x] #55070 <!-- LinearAlgebra: LazyString in error messages for Diagonal/Bidiagonal --> - [x] #54574 <!-- Make ScopedValues public --> - [x] #54739 <!-- finish implementation of upgradable stdlibs --> - [x] #54965 <!-- RFC: Make `include_dependency(path; track_content=true)` the default --> - [x] #53286 <!-- Raise an error when using `include_dependency` with non-existent file or directory --> - [x] #55066 <!-- fix loading of repeated/concurrent modules --> - [x] #52694 <!-- Reinstate similar for AbstractQ for backward compatibility --> - [x] #55218 <!-- Artifacts: use a different way of getting the UUID of a module --> - [x] #54891 <!-- #54739-related fixes for loading stdlibs --> - [x] #55072 <!-- trace-compile: don't generate `precompile` statements for OpaqueClosure methods --> - [x] #55188 <!-- Make Core.TypeofUnion use the type method table --> Need manual backport: - [ ] #55052 <!-- Fix `(l/r)mul!` with `Diagonal`/`Bidiagonal` --> Contains multiple commits, manual intervention needed: Non-merged PRs with backport label: - [ ] #55169 <!-- `propertynames` for SVD respects private argument --> - [ ] #55148 <!-- Random: Mark unexported public symbols as public --> - [ ] #55017 <!-- TOML: Make `Dates` a type parameter --> - [ ] #55013 <!-- [docs] change docstring to match code --> - [ ] #54919 <!-- Fix annotated join with non-concrete eltype iters --> - [ ] #54457 <!-- Make `String(::Memory)` copy --> - [ ] #53957 <!-- tweak how filtering is done for what packages should be precompiled --> - [ ] #51479 <!-- prevent code loading from lookin in the versioned environment when building Julia --> - [ ] #50813 <!-- More doctests for Sockets and capitalization fix --> - [ ] #50157 <!-- improve docs for `@inbounds` and `Base.@propagate_inbounds` --> - [ ] #41244 <!-- Fix shell `cd` error when working dir has been deleted -->
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Fixes #54860, see the commit message for more details.
The added test serves as a MWE of the original bug report.