From 78cb3d5901c5928d2729cebada8d12daa8963d51 Mon Sep 17 00:00:00 2001
From: Valentin Churavy <v.churavy@gmail.com>
Date: Sun, 8 Feb 2026 19:50:11 +0100
Subject: [PATCH] Preserve argtup

---
 src/batch.jl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/batch.jl b/src/batch.jl
index 4215fef..f0cbe96 100644
--- a/src/batch.jl
+++ b/src/batch.jl
@@ -261,7 +261,8 @@ end
     free_threads!(torelease_tuple)
     $ret_quote
   end
-  gcpr = Expr(:gc_preserve, block, :cfunc)
+  # argtup can be a mutable memory allocation and `batch_closure` will not gurantuee preservation
+  gcpr = Expr(:gc_preserve, block, :cfunc, :argtup)
   argt = Expr(:tuple)
   for k ∈ 1:K
     add_var!(q, argt, gcpr, args[k], :args, :gcp, k)