https://github.com/JuliaLang/julia
This is a bit of a tricky one, so let me start at the beginning. In PR #25506, I pushed my WIP of a new inlining passes. However, one of the things it temporarily doesn't do is turn call sites to :invoke, causing significantly more jl_apply_generic calls to be codegened. On CI for that PR (as well as locally), we non-deterministically see errors like: ``` LoadError("sysimg.jl", 213, KeyError(LibGit2 [76f85450-5226-5b5a-8eaa-529ad045b433])) ``` Some investigation revealed that what happened here is that a `PkgId` got placed in a dictionary, but was later failed to be retrieved because its hash had supposedly changes. Further investigation reveals that while the hash function used to place the item in the dictionary was `hash(x::Union{String,SubString{String}}, h::UInt64)` in hashing2.jl, the hash function being used to retrieve it is `hash(@nospecialize(x), h::UInt64)` in hashing.jl. The former is loaded later than the latter and should thus invalidate all specializations of the latter, making them ineligible for selection by jl_apply_generic. However, looking at the appropriate age ranges showed that `typeof(hash).name.mt.cache` had entries for both hash functions with overlapping age ranges (which is obviously incorrect). Tracking age range updates, it turns out the world age range for the specialization of `hash(@nospecialize(x), h::UInt64)` was expanded by invalidate_backedges called upon the definition of a hash function inside `LibGit2`. This seems wrong. I believe invalidate_backedges should only ever truncate world age ranges rather than expanding them. This patch simply does that. The non-determinism of the original issue appears to have to do with which of the specializations happen to be in the `jl_lookup_generic_` `call_cache` fast-path. This issue is fairly hard to reproduce because it requires a very specific confluence of circumstances. Since the range of the captured specialization only gets extended to before the min_world age of the new definition, it is never visible in the latest world (e.g. at the REPL). The included test case demonstrates the issue by capturing the world age with a task. Commenting out the `f(x::Float64)` definition makes the test pass, because it is that definition that causes the expansion of the original specialization of `f`.
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Makefile | -rw-r--r-- | 25.5 KB |
NEWS.md | -rw-r--r-- | 73.2 KB |
README.arm.md | -rw-r--r-- | 5.7 KB |
README.md | -rw-r--r-- | 29.7 KB |
README.windows.md | -rw-r--r-- | 13.0 KB |
VERSION | -rw-r--r-- | 10 bytes |
Windows.inc | -rw-r--r-- | 1.5 KB |
appveyor.yml | -rw-r--r-- | 2.2 KB |
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