Avoid Linux precompile hangs in live workload

Project.toml

@@ -10,6 +10,7 @@ Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
 EnumX = "4e289a0a-7415-4d19-859d-a7e5c4648b56"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 PrecompileTools = "aea7be01-6a6a-4083-8856-8a6e6704d82a"
+Preferences = "21216c6a-2e73-6563-6e65-726566657250"
 Reseau = "802f3686-a58f-41ce-bb0c-3c43c75bba36"
 SHA = "ea8e919c-243c-51af-8825-aaa63cd721ce"
 URIs = "5c2747f8-b7ea-4ff2-ba2e-563bfd36b1d4"
@@ -19,6 +20,7 @@ UUIDs = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
 CodecZlib = "0.7"
 EnumX = "1"
 PrecompileTools = "1.2.1"
+Preferences = "1"
 Reseau = "1.1.1"
 URIs = "1.6.1"
 julia = "1.10"

src/precompile.jl

@@ -1,4 +1,5 @@
 using PrecompileTools: @setup_workload, @compile_workload
+using Preferences: load_preference
 
 # Shared high-level workload used by package precompilation.
 
@@ -313,15 +314,15 @@ end
 function _run_precompile_workload!()::Nothing
     task = Threads.@spawn _run_precompile_workload_inner!()
     try
-        status = IOPoll.timedwait(() -> istaskdone(task), 20.0; pollint = 0.01)
+        status = Base.timedwait(() -> istaskdone(task), 20.0; pollint = 0.01)
         if status == :timed_out
             @try_ignore begin
                 IOPoll.shutdown!()
             end
             @try_ignore begin
                 Base.throwto(task, InterruptException())
             end
-            _ = IOPoll.timedwait(() -> istaskdone(task), 2.0; pollint = 0.01)
+            _ = Base.timedwait(() -> istaskdone(task), 2.0; pollint = 0.01)
             error("HTTP precompile workload timed out")
         end
         fetch(task)
@@ -335,6 +336,10 @@ end
 
 function _precompile_workload_enabled()::Bool
     Base.JLOptions().code_coverage == 0 || return false
+    # See JuliaWeb/HTTP.jl#1252: on Linux Julia 1.11+, the live precompile
+    # workload can hang in the Reseau/epoll path, so keep it opt-in there.
+    default_enabled = !(Sys.islinux() && VERSION >= v"1.11")
+    load_preference(@__MODULE__, "precompile_workload", default_enabled) || return false
     try
         return !isempty(HostResolvers.resolve_tcp_addrs("tcp", "localhost:0"))
     catch