Wait for profile peek task to stop before exit

base/Base.jl

@@ -567,6 +567,7 @@ if is_primary_base_module
 # triggers printing the report and (optionally) saving a heap snapshot after a SIGINFO/SIGUSR1 profile request
 # Needs to be in Base because Profile is no longer loaded on boot
 const PROFILE_PRINT_COND = Ref{Base.AsyncCondition}()
+global profile_peek_task::Task
 function profile_printing_listener()
     profile = nothing
     try
@@ -607,7 +608,8 @@ function __init__()
         Base.uv_unref(cond.handle)
         PROFILE_PRINT_COND[] = cond
         ccall(:jl_set_peek_cond, Cvoid, (Ptr{Cvoid},), PROFILE_PRINT_COND[].handle)
-        errormonitor(Threads.@spawn(profile_printing_listener()))
+        global profile_peek_task = Threads.@spawn(profile_printing_listener())
+        errormonitor(profile_peek_task)
     end
     _require_world_age[] = get_world_counter()
     # Prevent spawned Julia process from getting stuck waiting on Tracy to connect.

base/initdefs.jl

@@ -25,9 +25,22 @@ Stop the program with an exit code. The default exit code is zero, indicating th
 program completed successfully. In an interactive session, `exit()` can be called with
 the keyboard shortcut `^D`.
 """
-exit(n) = ccall(:jl_exit, Cvoid, (Int32,), n)
+function exit(n)
+    if generating_output()
+        # wait for any known tasks that might be slow to stop and cause spurious warnings during
+        # precompilation
+        wait_for_known_tasks()
+    end
+    return ccall(:jl_exit, Cvoid, (Int32,), n)
+end
 exit() = exit(0)
 
+
+function wait_for_known_tasks()
+    isdefined(Base, profile_peek_task) && _wait(profile_peek_task)
+    return nothing
+end
+
 const roottask = current_task()
 
 is_interactive = false