[CI] Intermittent failure in Profile on aarch64-linux-gnu

[giordano]

With #52434 seemingly fixed, we now have new exciting(?) intermittent test failures on aarch64-linux-gnu, this time in the Profile testset: example 1

The global RNG seed was 0x19c9238c8613eb4b179e96f98dc04cb6.

Error in testset Profile:
Test Failed at /cache/build/tester-armageddon-6/julialang/julia-master/julia-319d8900db/share/julia/stdlib/v1.12/Profile/test/runtests.jl:181
  Expression: success(p)
Error in testset Profile:
Test Failed at /cache/build/tester-armageddon-6/julialang/julia-master/julia-319d8900db/share/julia/stdlib/v1.12/Profile/test/runtests.jl:183
  Expression: occursin("done", s)
   Evaluated: occursin("done", "1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\n17\n18\n19\n")
Error in testset Profile:
Error During Test at /cache/build/tester-armageddon-6/julialang/julia-master/julia-319d8900db/share/julia/stdlib/v1.12/Profile/test/runtests.jl:184
  Test threw exception
  Expression: parse(Int, (split(s, '\n'))[end]) > 100
  ArgumentError: input string is empty or only contains whitespace
  Stacktrace:
   [1] tryparse_internal(::Type{Int64}, s::SubString{String}, startpos::Int64, endpos::Int64, base_::Int64, raise::Bool)
     @ Base ./parse.jl:115
   [2] parse(::Type{Int64}, s::SubString{String}; base::Nothing)
     @ Base ./parse.jl:254
   [3] parse(::Type{Int64}, s::SubString{String})
     @ Base ./parse.jl:253
   [4] top-level scope
     @ /cache/build/tester-armageddon-6/julialang/julia-master/julia-319d8900db/share/julia/stdlib/v1.12/Profile/test/runtests.jl:184
   [5] macro expansion
     @ /cache/build/tester-armageddon-6/julialang/julia-master/julia-319d8900db/share/julia/stdlib/v1.12/Test/src/Test.jl:676 [inlined]

example 2:

The global RNG seed was 0x9dff9cfd5ba0ef8a22a85a0c1776391e.

Test Failed at /cache/build/tester-armageddon-9/julialang/julia-master/julia-0ae5b321b3/share/julia/stdlib/v1.12/Profile/test/runtests.jl:52
  Expression: !(isempty(str))
   Evaluated: !(isempty(""))
Error in testset Profile:
Test Failed at /cache/build/tester-armageddon-9/julialang/julia-master/julia-0ae5b321b3/share/julia/stdlib/v1.12/Profile/test/runtests.jl:62
  Expression: !(isempty(String(take!(iobuf))))
   Evaluated: !(isempty(""))
Error in testset Profile:
Test Failed at /cache/build/tester-armageddon-9/julialang/julia-master/julia-0ae5b321b3/share/julia/stdlib/v1.12/Profile/test/runtests.jl:62
  Expression: !(isempty(String(take!(iobuf))))
   Evaluated: !(isempty(""))
Error in testset Profile:
Test Failed at /cache/build/tester-armageddon-9/julialang/julia-master/julia-0ae5b321b3/share/julia/stdlib/v1.12/Profile/test/runtests.jl:62
  Expression: !(isempty(String(take!(iobuf))))
   Evaluated: !(isempty(""))
Error in testset Profile:
Test Failed at /cache/build/tester-armageddon-9/julialang/julia-master/julia-0ae5b321b3/share/julia/stdlib/v1.12/Profile/test/runtests.jl:62
  Expression: !(isempty(String(take!(iobuf))))
   Evaluated: !(isempty(""))
Error in testset Profile:
Test Failed at /cache/build/tester-armageddon-9/julialang/julia-master/julia-0ae5b321b3/share/julia/stdlib/v1.12/Profile/test/runtests.jl:62
  Expression: !(isempty(String(take!(iobuf))))
   Evaluated: !(isempty(""))

Edit: I could reproduce the failure with for _ in 1:50; Base.runtests("Profile"; seed=0x19c9238c8613eb4b179e96f98dc04cb6); end (doing a loop to increase the chances to reproduce this, it isn't systematic, but with that seed it seems to reproduce quite frequently) back in Julia v1.6.0 (didn't go farther back)

[vtjnash]

It is probably an upstream libunwind bug, based on what that test is, and the way that libunwind tends to fix this code only on one platform at a time, even though the code is identical but copied separately for each platform