From 6308ebd6ec8ec943c72603c7fb82bba4c116e07f Mon Sep 17 00:00:00 2001
From: Jeff Bezanson <jeff.bezanson@gmail.com>
Date: Fri, 12 Apr 2019 10:59:03 -0400
Subject: [PATCH] fix potential stack overflow in Profile.jl (#31693)

---
 stdlib/Profile/src/Profile.jl | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/stdlib/Profile/src/Profile.jl b/stdlib/Profile/src/Profile.jl
index 8ae9542c2c2f4..b775bc88d1bb0 100644
--- a/stdlib/Profile/src/Profile.jl
+++ b/stdlib/Profile/src/Profile.jl
@@ -547,9 +547,13 @@ function tree!(root::StackFrameTree{T}, all::Vector{UInt64}, lidict::Union{LineI
         end
     end
     function cleanup!(node::StackFrameTree)
-        empty!(node.builder_key)
-        empty!(node.builder_value)
-        foreach(cleanup!, values(node.down))
+        stack = StackFrameTree[node]
+        while !isempty(stack)
+            node = pop!(stack)
+            empty!(node.builder_key)
+            empty!(node.builder_value)
+            append!(stack, values(node.down))
+        end
         nothing
     end
     cleanup!(root)