Revise.jl fails to track updated packages on Windows

[bradcarman]

The following code does not work on my Windows PC (tested on 3 different machines running Julia v1.8.0-rc3 and v1.8.0). Seems to work though on Linux. To test, make sure to run with --check-bounds=yes...

using Revise, Pkg, Test
Pkg.activate(; temp=true)
Pkg.add(name="NearestNeighbors", version="0.4.10")

using NearestNeighbors
data = [[0.13380863416387367, 0.7845254987714512],[0.1563342025559629, 0.],[0.563342025559629, 0.7]]
tree = KDTree(hcat(map(p -> [p[1], p[2]], data)...));

println(":: current path ==> $(which(knn, typeof.((tree, [0.15, 0.8], 3, true, x -> x == 2))).file)")
@test_throws BoundsError knn(tree, [0.15, 0.8], 3, true, x -> x == 2) # buggy behavior

Pkg.update("NearestNeighbors")
revise(NearestNeighbors)

println(":: updated path ==> $(which(knn, typeof.((tree, [0.15, 0.8], 3, true, x -> x == 2))).file)")
nearest, distance = knn(tree, [0.15, 0.8], 3, true, x -> x == 2) # should work, but fails on Windows

With the following output...

> julia --check-bounds=yes -q -i test2.jl
  Activating new project at `C:\Users\CarmanBr\AppData\Local\Temp\jl_UgBJAS`
    Updating registry at `C:\Users\CarmanBr\.julia\registries\CatapultApps`
    Updating git-repo `https://ist-catapult.visualstudio.com/DefaultCollection/CatapultApps/_git/Registry`
    Updating registry at `C:\Users\CarmanBr\.julia\registries\General.toml`
   Resolving package versions...
    Updating `C:\Users\CarmanBr\AppData\Local\Temp\jl_UgBJAS\Project.toml`
⌃ [b8a86587] + NearestNeighbors v0.4.10
    Updating `C:\Users\CarmanBr\AppData\Local\Temp\jl_UgBJAS\Manifest.toml`
  [b4f34e82] + Distances v0.10.7
⌃ [b8a86587] + NearestNeighbors v0.4.10
  [90137ffa] + StaticArrays v1.5.6
  [1e83bf80] + StaticArraysCore v1.3.0
  [82ae8749] + StatsAPI v1.5.0
  [56f22d72] + Artifacts
  [8f399da3] + Libdl
  [37e2e46d] + LinearAlgebra
  [9a3f8284] + Random
  [ea8e919c] + SHA v0.7.0
  [9e88b42a] + Serialization
  [2f01184e] + SparseArrays
  [10745b16] + Statistics
  [e66e0078] + CompilerSupportLibraries_jll v0.5.2+0
  [4536629a] + OpenBLAS_jll v0.3.20+0
  [8e850b90] + libblastrampoline_jll v5.1.1+0
        Info Packages marked with ⌃ have new versions available
:: current path ==> C:\Users\CarmanBr\.julia\packages\NearestNeighbors\YCcEC\src\knn.jl
    Updating registry at `C:\Users\CarmanBr\.julia\registries\CatapultApps`
    Updating git-repo `https://ist-catapult.visualstudio.com/DefaultCollection/CatapultApps/_git/Registry`
    Updating registry at `C:\Users\CarmanBr\.julia\registries\General.toml`
    Updating `C:\Users\CarmanBr\AppData\Local\Temp\jl_UgBJAS\Project.toml`
  [b8a86587] ↑ NearestNeighbors v0.4.10 ⇒ v0.4.11
    Updating `C:\Users\CarmanBr\AppData\Local\Temp\jl_UgBJAS\Manifest.toml`
  [b8a86587] ↑ NearestNeighbors v0.4.10 ⇒ v0.4.11
:: updated path ==> C:\Users\CarmanBr\.julia\packages\NearestNeighbors\YCcEC\src\knn.jl
ERROR: LoadError: BoundsError: attempt to access 3-element Vector{Int64} at index [-1]
Stacktrace:
 [1] getindex
   @ .\array.jl:924 [inlined]
 [2] knn_point!(tree::KDTree{StaticArraysCore.SVector{2, Float64}, Euclidean, Float64}, point::Vector{Float64}, sortres::Bool, dist::Vector{Float64}, idx::Vector{Int64}, skip::var"#9#10")      
   @ NearestNeighbors C:\Users\CarmanBr\.julia\packages\NearestNeighbors\YCcEC\src\knn.jl:36
 [3] knn(tree::KDTree{StaticArraysCore.SVector{2, Float64}, Euclidean, Float64}, point::Vector{Float64}, k::Int64, sortres::Bool, skip::var"#9#10")
   @ NearestNeighbors C:\Users\CarmanBr\.julia\packages\NearestNeighbors\YCcEC\src\knn.jl:46
 [4] top-level scope
   @ C:\Work\IST\Projects\JuliaPackages\BuildAndBenchmark.jl\test2.jl:16

As can be seen, the "current" and "updated" paths are the same. Revise is not updating to the new code path.

[bradcarman]

From testing with my colleagues, it seems this requires a fully installed Windows machine. A Windows VM seems to work.

[bradcarman]

It seems that Revise also can't see changes to the Project.toml (this may be the root of the problem here). For example I'm developing PkgA and when in that environment I run Pkg.add("SomePackage"), SomePackage will not be available unless I restart Julia.

[bradcarman]

Just a note, this issue still exists. Ran this MWE again on v1.9 and it's still the same issue in Windows. This is a huge pain point for me because often in development the environment is changing. Fixing this bug will be a huge time saver for me.

[maleadt]

I believe that this has to do with the use of temporary environments. Your MWE also fails for me on Linux, and conversely, when using a non-temporary environment it works on Windows:

$ julia --project --check-bounds=yes

julia> Sys.iswindows()
true

(x) pkg> st
Status `C:\Users\Tim\...\x\Project.toml` (empty project)

julia> using Revise, Pkg, Test

julia> Pkg.add(name="NearestNeighbors", version="0.4.10")

julia> using NearestNeighbors
julia> data = [[0.13380863416387367, 0.7845254987714512],[0.1563342025559629, 0.],[0.563342025559629, 0.7]]
julia> tree = KDTree(hcat(map(p -> [p[1], p[2]], data)...));
julia> println(":: current path ==> $(which(knn, typeof.((tree, [0.15, 0.8], 3, true, x -> x == 2))).file)")
:: current path ==> C:\Users\Tim\.julia\packages\NearestNeighbors\YCcEC\src\knn.jl
julia> @test_throws BoundsError knn(tree, [0.15, 0.8], 3, true, x -> x == 2) # buggy behavior
Test Passed
      Thrown: BoundsError

julia> Pkg.update("NearestNeighbors")
    Updating registry at `C:\Users\Tim\.julia\registries\General.toml`
    Updating `C:\Users\Tim\...\x\Project.toml`
  [b8a86587] ↑ NearestNeighbors v0.4.10 ⇒ v0.4.13
    Updating `C:\Users\Tim\...\x\Manifest.toml`
  [b8a86587] ↑ NearestNeighbors v0.4.10 ⇒ v0.4.13

julia> println(":: updated path ==> $(which(knn, typeof.((tree, [0.15, 0.8], 3, true, x -> x == 2))).file)")
┌ Error: Failed to revise C:\Users\Tim\.julia\packages\NearestNeighbors\huCPc\src\NearestNeighbors.jl
│   exception =
│    MethodError: no method matching knn_point!(::KDTree{StaticArraysCore.SVector{2, Float64}, Euclidean, Float64}, ::Vector{Float64}, ::Bool, ::Vector{Float64}, ::Vector{Int64}, ::typeof(NearestNeighbors.always_false))
│    The applicable method may be too new: running in world age 31439, while current world is 31447.

Although the revise failed, that's because of bugs like #693 or #607, which IIUC would require some changes to the package itself. But at least the revise operation itself worked, as you can see packages\NearestNeighbors\YCcEC become packages\NearestNeighbors\huCPc.

[bradcarman]

Hi @maleadt, are you maybe running a VM with Windows? I do not get the same behavior on a pure Windows machine, even when I use a non-temporary environment...

>julia --project=. --check-bounds=yes -q -i bug.jl 
   Resolving package versions...
    Updating `C:\Users\CarmanBr\OneDrive - Illinois Tool Works, Inc\Work\IST\Project\2023\JuliaHub\ReviseBug\Project.toml`
⌃ [b8a86587] + NearestNeighbors v0.4.10
    Updating `C:\Users\CarmanBr\OneDrive - Illinois Tool Works, Inc\Work\IST\Project\2023\JuliaHub\ReviseBug\Manifest.toml`
  [b4f34e82] + Distances v0.10.9
⌃ [b8a86587] + NearestNeighbors v0.4.10
.
.
.
:: current path ==> C:\Users\CarmanBr\.julia\packages\NearestNeighbors\YCcEC\src\knn.jl
.
.
.
    Updating `C:\Users\CarmanBr\OneDrive - Illinois Tool Works, Inc\Work\IST\Project\2023\JuliaHub\ReviseBug\Project.toml`
  [b8a86587] ↑ NearestNeighbors v0.4.10 ⇒ v0.4.13
    Updating `C:\Users\CarmanBr\OneDrive - Illinois Tool Works, Inc\Work\IST\Project\2023\JuliaHub\ReviseBug\Manifest.toml`
  [b8a86587] ↑ NearestNeighbors v0.4.10 ⇒ v0.4.13

:: updated path ==> C:\Users\CarmanBr\.julia\packages\NearestNeighbors\YCcEC\src\knn.jl

Where bug.jl run the original MWE but removes Pkg.activate(; temp=true)

As can be seen, Revise.jl is not updating the path to the package, it remains as YCcEC

[maleadt]

The update path remains the same here too, but that may be because Revise fails before that.

I'm running natively, Windows 11, Julia 1.10 latest beta, and latest version of Revise.jl.

[bradcarman]

I'm confused, @maleadt you said...

But at least the revise operation itself worked, as you can see packages\NearestNeighbors\YCcEC become packages\NearestNeighbors\huCPc.

On my end, I do not get a Revise.jl error, and the updated path does not change.

[maleadt]

You can see the updated path in the error message:

julia> println(":: current path ==> $(which(knn, typeof.((tree, [0.15, 0.8], 3, true, x -> x == 2))).file)")
:: current path ==> C:\Users\Tim\.julia\packages\NearestNeighbors\YCcEC\src\knn.jl

...

┌ Error: Failed to revise C:\Users\Tim\.julia\packages\NearestNeighbors\huCPc\src\NearestNeighbors.jl

Let me try creating a smaller reproducer that doesn't run into the world age errors.

[maleadt]

Here's a simpler reproducer:

using Revise, Pkg

# try with and without this
#Pkg.activate(; temp=true)

Pkg.add(url="https://github.com/maleadt/ReviseTest.jl", rev="cf766c822806398f4ac8e89fb7b588d551e70d1f")

using ReviseTest
@show ReviseTest.test()

Pkg.add(url="https://github.com/maleadt/ReviseTest.jl", rev="6396547c3871f07830744267391cfba5146eba12")

@show ReviseTest.test()

On Linux, using a temporary environment:

julia> using Revise, Pkg

julia> Pkg.activate(; temp=true)
  Activating new project at `/tmp/jl_kP1IcQ`

julia> Pkg.add(url="https://github.com/maleadt/ReviseTest.jl", rev="cf766c822806398f4ac8e89fb7b588d551e70d1f")
   Resolving package versions...
    Updating `/tmp/jl_kP1IcQ/Project.toml`
  [024d2098] + ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8`
    Updating `/tmp/jl_kP1IcQ/Manifest.toml`
  [024d2098] + ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8`

julia> using ReviseTest

julia> ReviseTest.test()
1

julia> Pkg.add(url="https://github.com/maleadt/ReviseTest.jl", rev="6396547c3871f07830744267391cfba5146eba12")
   Resolving package versions...
    Updating `/tmp/jl_kP1IcQ/Project.toml`
  [024d2098] ~ ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8` ⇒ v0.2.0 `https://github.com/maleadt/ReviseTest.jl#6396547`
    Updating `/tmp/jl_kP1IcQ/Manifest.toml`
  [024d2098] ~ ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8` ⇒ v0.2.0 `https://github.com/maleadt/ReviseTest.jl#6396547`

julia> ReviseTest.test()
1

Using julia --project, in an otherwise empty environment:

julia> using Revise, Pkg

julia> Pkg.status()
Status `~/Julia/x/Project.toml` (empty project)

julia> Pkg.add(url="https://github.com/maleadt/ReviseTest.jl", rev="cf766c822806398f4ac8e89fb7b588d551e70d1f")
   Resolving package versions...
    Updating `~/Julia/x/Project.toml`
  [024d2098] + ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8`
    Updating `~/Julia/x/Manifest.toml`
  [024d2098] + ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8`

julia> using ReviseTest

julia> ReviseTest.test()
1

julia> Pkg.add(url="https://github.com/maleadt/ReviseTest.jl", rev="6396547c3871f07830744267391cfba5146eba12")
   Resolving package versions...
    Updating `~/Julia/x/Project.toml`
  [024d2098] ~ ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8` ⇒ v0.2.0 `https://github.com/maleadt/ReviseTest.jl#6396547`
    Updating `~/Julia/x/Manifest.toml`
  [024d2098] ~ ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8` ⇒ v0.2.0 `https://github.com/maleadt/ReviseTest.jl#6396547`

julia> ReviseTest.test()
2

The same, but on Windows:

julia> using Revise, Pkg

julia> Sys.iswindows()
true

julia> Pkg.status()
Status `C:\Users\Tim\x\Project.toml` (empty project)

julia> Pkg.add(url="https://github.com/maleadt/ReviseTest.jl", rev="cf766c822806398f4ac8e89fb7b588d551e70d1f")
   Resolving package versions...
    Updating `C:\Users\Tim\x\Project.toml`
  [024d2098] + ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8`
    Updating `C:\Users\Tim\x\Manifest.toml`
  [024d2098] + ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8`

julia> using ReviseTest

julia> ReviseTest.test()
1

julia> Pkg.add(url="https://github.com/maleadt/ReviseTest.jl", rev="6396547c3871f07830744267391cfba5146eba12")
   Resolving package versions...
    Updating `C:\Users\Tim\x\Project.toml`
  [024d2098] ~ ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8` ⇒ v0.2.0 `https://github.com/maleadt/ReviseTest.jl#6396547`
    Updating `C:\Users\Tim\x\Manifest.toml`
  [024d2098] ~ ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8` ⇒ v0.2.0 `https://github.com/maleadt/ReviseTest.jl#6396547`

julia> ReviseTest.test()
2

[maleadt]

And FWIW, this also seems to work on my Windows machine when using Julia 1.8 or 1.9,

[bradcarman]

I don't get the same behavior, from either example. No Revise errors, no path changes on my end. Here is what I get from the reproducer example...

julia> using Revise, Pkg

julia> Sys.iswindows()
true

julia> Pkg.status()
Status `C:\Users\CarmanBr\OneDrive - Illinois Tool Works, Inc\Work\IST\Project\2023\JuliaHub\ReviseBug\Project.toml` (empty project)

julia> Pkg.add(url="https://github.com/maleadt/ReviseTest.jl", rev="cf766c822806398f4ac8e89fb7b588d551e70d1f")
    Updating registry at `C:\Users\CarmanBr\.julia\registries\JuliaComputingRegistry.toml`
    Updating registry at `C:\Users\CarmanBr\.julia\registries\JuliaHubRegistry.toml`      
   Resolving package versions...
    Updating `C:\Users\CarmanBr\OneDrive - Illinois Tool Works, Inc\Work\IST\Project\2023\JuliaHub\ReviseBug\Project.toml`
  [024d2098] + ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8`
    Updating `C:\Users\CarmanBr\OneDrive - Illinois Tool Works, Inc\Work\IST\Project\2023\JuliaHub\ReviseBug\Manifest.toml`
  [024d2098] + ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8`

julia> using ReviseTest
[ Info: Precompiling ReviseTest [024d2098-9b6b-4b53-b01b-ca5595ac7762]

julia> ReviseTest.test()
1

julia> Pkg.add(url="https://github.com/maleadt/ReviseTest.jl", rev="6396547c3871f07830744267391cfba5146eba12")
   Resolving package versions...
    Updating `C:\Users\CarmanBr\OneDrive - Illinois Tool Works, Inc\Work\IST\Project\2023\JuliaHub\ReviseBug\Project.toml`
  [024d2098] ~ ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8` ⇒ v0.2.0 `https://github.com/maleadt/ReviseTest.jl#6396547`
    Updating `C:\Users\CarmanBr\OneDrive - Illinois Tool Works, Inc\Work\IST\Project\2023\JuliaHub\ReviseBug\Manifest.toml`
  [024d2098] ~ ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8` ⇒ v0.2.0 `https://github.com/maleadt/ReviseTest.jl#6396547`

julia> ReviseTest.test()
1

[bradcarman]

And just for safe measure, running revise() return true, but I don't get any change...

julia> revise(ReviseTest)
true

julia> ReviseTest.test()
1

julia> versioninfo()
Julia Version 1.9.1
Commit 147bdf428c (2023-06-07 08:27 UTC)
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: 12 × Intel(R) Xeon(R) W-11855M CPU @ 3.20GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-14.0.6 (ORCJIT, tigerlake)
  Threads: 8 on 12 virtual cores
Environment:
  JULIA_DIR = C:\Programs\julia-1.9.1
  JULIA_PKG_PRECOMPILE_AUTO = 0
  JULIA_EDITOR = code
  JULIA_NUM_THREADS = 8

[maleadt]

What is the value of Revise.polling_files[]? If false, does it work if you start with JULIA_REVISE_POLL=1 set in your environment (e.g. by doing ENV["JULIA_REVISE_POLL"] = 1 before using Revise)?

[bradcarman]

Revise.polling_files[] returns false. I tried the following...

reproducer.jl

ENV["JULIA_REVISE_POLL"] = 1 
using Revise, Pkg
@show Revise.polling_files[]

Pkg.add(url="https://github.com/maleadt/ReviseTest.jl", rev="cf766c822806398f4ac8e89fb7b588d551e70d1f")
using ReviseTest
@show ReviseTest.test()

Pkg.add(url="https://github.com/maleadt/ReviseTest.jl", rev="6396547c3871f07830744267391cfba5146eba12")
@show ReviseTest.test()

Output...

>C:\Programs\julia-1.10.0-beta1\bin\julia --project=. reproducer.jl
Revise.polling_files[] = true
    Updating registry at `C:\Users\CarmanBr\.julia\registries\JuliaComputingRegistry.toml`
    Updating registry at `C:\Users\CarmanBr\.julia\registries\JuliaHubRegistry.toml`
   Resolving package versions...
    Updating `C:\Users\CarmanBr\OneDrive - Illinois Tool Works, Inc\Work\IST\Project\2023\JuliaHub\ReviseBug\Project.toml`
  [024d2098] + ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8`
    Updating `C:\Users\CarmanBr\OneDrive - Illinois Tool Works, Inc\Work\IST\Project\2023\JuliaHub\ReviseBug\Manifest.toml`
  [024d2098] + ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8`
ReviseTest.test() = 1
   Resolving package versions...
    Updating `C:\Users\CarmanBr\OneDrive - Illinois Tool Works, Inc\Work\IST\Project\2023\JuliaHub\ReviseBug\Project.toml`
  [024d2098] ~ ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8` ⇒ v0.2.0 `https://github.com/maleadt/ReviseTest.jl#6396547`
    Updating `C:\Users\CarmanBr\OneDrive - Illinois Tool Works, Inc\Work\IST\Project\2023\JuliaHub\ReviseBug\Manifest.toml`
  [024d2098] ~ ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8` ⇒ v0.2.0 `https://github.com/maleadt/ReviseTest.jl#6396547`
ReviseTest.test() = 1

[maleadt]

Could you also try the following:

using Pkg, FileWatching

Pkg.activate(; temp=true)

Pkg.add(url="https://github.com/maleadt/ReviseTest.jl", rev="cf766c822806398f4ac8e89fb7b588d551e70d1f")

manifest = joinpath(dirname(Base.active_project()), "Manifest.toml")

t1 = @async watch_file(manifest)
t2 = @async poll_file(manifest)

Pkg.add(url="https://github.com/maleadt/ReviseTest.jl", rev="6396547c3871f07830744267391cfba5146eba12")

fetch(t1)
fetch(t2)   # this one takes a while

Example output:

julia> using Pkg, FileWatching

julia> Pkg.activate(; temp=true)
  Activating new project at `C:\Users\Tim\AppData\Local\Temp\jl_QANtOG`

julia> Pkg.add(url="https://github.com/maleadt/ReviseTest.jl", rev="cf766c822806398f4ac8e89fb7b588d551e70d1f")
   Resolving package versions...
    Updating `C:\Users\Tim\AppData\Local\Temp\jl_QANtOG\Project.toml`
  [024d2098] + ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8`
    Updating `C:\Users\Tim\AppData\Local\Temp\jl_QANtOG\Manifest.toml`
  [024d2098] + ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8`

julia> manifest = joinpath(dirname(Base.active_project()), "Manifest.toml")
"C:\\Users\\Tim\\AppData\\Local\\Temp\\jl_QANtOG\\Manifest.toml"

julia> t1 = @async watch_file(manifest)
julia> t2 = @async poll_file(manifest)

julia> Pkg.add(url="https://github.com/maleadt/ReviseTest.jl", rev="6396547c3871f07830744267391cfba5146eba12")
   Resolving package versions...
    Updating `C:\Users\Tim\AppData\Local\Temp\jl_QANtOG\Project.toml`
  [024d2098] ~ ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8` ⇒ v0.2.0 `https://github.com/maleadt/ReviseTest.jl#6396547`
    Updating `C:\Users\Tim\AppData\Local\Temp\jl_QANtOG\Manifest.toml`
  [024d2098] ~ ReviseTest v0.1.0 `https://github.com/maleadt/ReviseTest.jl#cf766c8` ⇒ v0.2.0 `https://github.com/maleadt/ReviseTest.jl#6396547`

julia> fetch(t1)
FileWatching.FileEvent(false, true, false)

julia> fetch(t2)   # this one takes a while
(StatStruct("" size: 436 bytes device: 840917940 inode: 74480 mode: 0o100666 (-rw-rw-rw-) nlink: 1 uid: 0 gid: 0 rdev: 0 blksz: 4096 blocks: 8 mtime:  (5 seconds ago) ctime:  (5 seconds ago)), StatStruct("" size: 436 bytes device: 840917940 inode: 74480 mode: 0o100666 (-rw-rw-rw-) nlink: 1 uid: 0 gid: 0 rdev: 0 blksz: 4096 blocks: 8 mtime:  (5 seconds ago) ctime:  (5 seconds ago)))

i.e. both watch_file and poll_file detected the change (the latter took 5 seconds, but that's expected with polling).
If fetch(t1) hangs, i.e. if file watching doesn't work, try interrupting it and still doing the fetch(t2). If that one does return after a while, that means polling still works, and JULIA_REVISE_POLL should too.