# SPDX-FileCopyrightText: 2023 Richard Masters <grick23@gmail.com>
# SPDX-License-Identifier: MIT
diff -r -u musl-1.1.24.orig/src/malloc/malloc.c musl-1.1.24/src/malloc/malloc.c
--- src/malloc/malloc.c	2019-10-13 21:58:27.000000000 +0000
+++ src/malloc/malloc.c	2023-12-22 23:18:21.088570834 +0000
@@ -496,7 +496,9 @@
 		uintptr_t a = (uintptr_t)self + SIZE_ALIGN+PAGE_SIZE-1 & -PAGE_SIZE;
 		uintptr_t b = (uintptr_t)next - SIZE_ALIGN & -PAGE_SIZE;
 #if 1
+		int e = errno;
 		__madvise((void *)a, b-a, MADV_DONTNEED);
+		errno = e;
 #else
 		__mmap((void *)a, b-a, PROT_READ|PROT_WRITE,
 			MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED, -1, 0);