Unreachable reached at 0x7b92c0862a74 / Illegal instruction

[mortenpi]

With the current nightly. For an MWE, just run in the MarkdownAST repo (master at 30844f9 right now):

$ julia --project test/basedocstrings.jl
Precompiling MarkdownAST...
  1 dependency successfully precompiled in 1 seconds. 3 already precompiled.
Unreachable reached at 0x7b92c0862a74

[3077028] signal 4 (2): Illegal instruction
in expression starting at /home/mortenpi/juliadocs/clones/MarkdownAST.jl/test/basedocstrings.jl:59
moduledocstrings! at /home/mortenpi/juliadocs/clones/MarkdownAST.jl/test/basedocstrings.jl:41
alldocstrings at /home/mortenpi/juliadocs/clones/MarkdownAST.jl/test/basedocstrings.jl:54 [inlined]
macro expansion at /home/mortenpi/juliadocs/clones/MarkdownAST.jl/test/basedocstrings.jl:60 [inlined]
macro expansion at /home/mortenpi/julia/usr/share/julia/stdlib/v1.12/Test/src/Test.jl:164 [inlined]
top-level scope at /home/mortenpi/juliadocs/clones/MarkdownAST.jl/test/basedocstrings.jl:60
jl_toplevel_eval_flex at /home/mortenpi/julia/src/toplevel.c:944
jl_toplevel_eval_flex at /home/mortenpi/julia/src/toplevel.c:893
ijl_toplevel_eval at /home/mortenpi/julia/src/toplevel.c:964
ijl_toplevel_eval_in at /home/mortenpi/julia/src/toplevel.c:1006
eval at ./boot.jl:432 [inlined]
include_string at ./loading.jl:2535
_include at ./loading.jl:2595
include at ./Base.jl:559 [inlined]
exec_options at ./client.jl:255
_start at ./client.jl:533
jfptr__start_69654 at /home/mortenpi/julia/usr/lib/julia/sys.so (unknown line)
jl_apply at /home/mortenpi/julia/src/julia.h:2184 [inlined]
true_main at /home/mortenpi/julia/src/jlapi.c:900
jl_repl_entrypoint at /home/mortenpi/julia/src/jlapi.c:1059
main at /home/mortenpi/julia/cli/loader_exe.c:58
unknown function (ip: 0x7b92c1e29d8f)
__libc_start_main at /lib/x86_64-linux-gnu/libc.so.6 (unknown line)
_start at /home/mortenpi/julia/julia (unknown line)
Allocations: 3914780 (Pool: 3914677; Big: 103); GC: 6
Illegal instruction (core dumped)

This was with a local build:

Julia Version 1.12.0-DEV.240
Commit 61caaa886a* (2024-03-25 17:54 UTC)
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 16 × 12th Gen Intel(R) Core(TM) i7-1260P
  WORD_SIZE: 64
  LLVM: libLLVM-16.0.6 (ORCJIT, alderlake)
Threads: 1 default, 0 interactive, 1 GC (on 16 virtual cores)

But it also showed up in the nightly CI with the official nightly binary: https://github.com/JuliaDocs/MarkdownAST.jl/actions/runs/8427886618/job/23079304876?pr=27#step:6:11

[inkydragon]

Reproduced with

• (juliaup nightly) Julia Version 1.12.0-DEV.423 (2024-04-26) 0b7ee9d
• Linux (x86_64-linux-gnu); Windows (x86_64-w64-mingw32)

NOTE: Save as a script and run it, don't run it in REPL.

import_repl() = Base.eval(@__MODULE__, :(import REPL))
for _ in 1:2
    import_repl()

    docstr = Base.Docs.DocStr(Base.Core.svec(), 0, Dict())
    # NOTE: Docs.parsedoc is empty, parsedoc defined in REPL
    Base.Docs.parsedoc(docstr)
end

The problem here is trying to call an empty function

julia/base/docs/Docs.jl

Line 723 in 0b7ee9d

function parsedoc end

---

Fix or workaround: @mortenpi

-Docs.parsedoc
+using REPL
+REPL.parsedoc

https://github.com/JuliaDocs/MarkdownAST.jl/blob/30844f9496c56f9e0cde794adf67021823a4cea2/test/basedocstrings.jl#L41