Calling revise sometimes fails with a BoundsError inside process_user_callbacks

[Octogonapus]

I am calling revise() from my program to watch for changes and re-run tests, which I think is causing it to run from multiple threads. It looks like revise() isn't thread-safe (occasional exception below) but I wanted to confirm.

BoundsError: attempt to access 16-element Vector{Any} at index [0]
    Stacktrace:
     [1] _deleteend!
       @ ./array.jl:1081 [inlined]
     [2] empty!
       @ ./array.jl:1842 [inlined]
     [3] empty!(h::Dict{Any, Nothing})
       @ Base ./dict.jl:249
     [4] empty!
       @ ./set.jl:121 [inlined]
     [5] process_user_callbacks!(keys::Set{Any}; throw::Bool)
       @ Revise ~/.julia/packages/Revise/uvGMC/src/callbacks.jl:126
     [6] process_user_callbacks! (repeats 2 times)
       @ ~/.julia/packages/Revise/uvGMC/src/callbacks.jl:112 [inlined]
     [7] revise(; throw::Bool)
       @ Revise ~/.julia/packages/Revise/uvGMC/src/packagedef.jl:845
     [8] revise()
       @ Revise ~/.julia/packages/Revise/uvGMC/src/packagedef.jl:750

Revise v3.6.4
Julia 1.10.5

[timholy]

It should be, see, e.g., #846. If you can provide a MWE I can look in greater detail.