diff --git a/base/channels.jl b/base/channels.jl
index 0cf3b8d799926..232e73db987f1 100644
--- a/base/channels.jl
+++ b/base/channels.jl
@@ -183,7 +183,8 @@ Close a channel. An exception (optionally given by `excp`), is thrown by:
 * [`put!`](@ref) on a closed channel.
 * [`take!`](@ref) and [`fetch`](@ref) on an empty, closed channel.
 """
-function close(c::Channel, excp::Exception=closed_exception())
+close(c::Channel) = close(c, closed_exception()) # nospecialize on default arg seems to confuse makedocs
+function close(c::Channel, @nospecialize(excp::Exception))
     lock(c)
     try
         c.excp = excp
diff --git a/test/channels.jl b/test/channels.jl
index 1a989747c3863..9f5f21e835db2 100644
--- a/test/channels.jl
+++ b/test/channels.jl
@@ -619,3 +619,20 @@ end
         @test n_avail(c) == 0
     end
 end
+
+# Issue #49507: stackoverflow in type inference caused by close(::Channel, ::Exception)
+@testset "close(::Channel, ::StackOverflowError)" begin
+    ch = let result = Channel()
+        foo() = try
+            foo()
+        catch e;
+            close(result, e)
+        end
+
+        foo()  # This shouldn't fail with an internal stackoverflow error in inference.
+
+        result
+    end
+
+    @test (try take!(ch) catch e; e; end) isa StackOverflowError
+end