diff --git a/Misc/NEWS.d/next/Build/2026-06-26-16-30-00.gh-issue-152240.loongarch.rst b/Misc/NEWS.d/next/Build/2026-06-26-16-30-00.gh-issue-152240.loongarch.rst
new file mode 100644
index 000000000000000..cf2a150b95b8ac1
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2026-06-26-16-30-00.gh-issue-152240.loongarch.rst
@@ -0,0 +1,3 @@
+Fix C stack unwinding tests on Linux LoongArch builds. The manual frame
+pointer unwinder now recognizes the LoongArch frame layout, and clang builds
+now request runtime unwind tables.
diff --git a/Modules/_testinternalcapi.c b/Modules/_testinternalcapi.c
index d0d1f1f1bc8e53e..8de5ee502cfb4cf 100644
--- a/Modules/_testinternalcapi.c
+++ b/Modules/_testinternalcapi.c
@@ -98,6 +98,12 @@ static const uintptr_t min_frame_pointer_addr = 0x1000;
 // https://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html#STACK
 #  define FRAME_POINTER_NEXT_OFFSET 0
 #  define FRAME_POINTER_RETURN_OFFSET 2
+#elif defined(__loongarch__)
+// On LoongArch, the frame pointer is the caller's stack pointer.
+// The saved frame pointer is stored at fp[-2], and the return
+// address is stored at fp[-1].
+#  define FRAME_POINTER_NEXT_OFFSET -2
+#  define FRAME_POINTER_RETURN_OFFSET -1
 #else
 #  define FRAME_POINTER_NEXT_OFFSET 0
 #  define FRAME_POINTER_RETURN_OFFSET 1
diff --git a/configure b/configure
index a978b613514f124..8416de3f1a1437a 100755
--- a/configure
+++ b/configure
@@ -10581,6 +10581,62 @@ printf "%s\n" "#define _Py_WITH_FRAME_POINTERS 1" >>confdefs.h
 
     CFLAGS_NODIST="$CFLAGS_NODIST -std=c11"
 
+    if test "$MACHDEP" = linux && test "$ac_cv_cc_name" = clang
+then :
+
+      case $host_cpu in #(
+  loongarch*) :
+
+                        { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether C compiler accepts -funwind-tables" >&5
+printf %s "checking whether C compiler accepts -funwind-tables... " >&6; }
+if test ${ax_cv_check_cflags__Werror__funwind_tables+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e)
+  ax_check_save_flags=$CFLAGS
+  CFLAGS="$CFLAGS -Werror -funwind-tables"
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main (void)
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+  ax_cv_check_cflags__Werror__funwind_tables=yes
+else case e in #(
+  e) ax_cv_check_cflags__Werror__funwind_tables=no ;;
+esac
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+  CFLAGS=$ax_check_save_flags ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags__Werror__funwind_tables" >&5
+printf "%s\n" "$ax_cv_check_cflags__Werror__funwind_tables" >&6; }
+if test "x$ax_cv_check_cflags__Werror__funwind_tables" = xyes
+then :
+
+          CFLAGS_NODIST="$CFLAGS_NODIST -funwind-tables"
+
+else case e in #(
+  e) : ;;
+esac
+fi
+
+       ;; #(
+  *) :
+     ;;
+esac
+
+fi
+
 
 
   { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if we can add -Wextra" >&5
diff --git a/configure.ac b/configure.ac
index a2729c22386a951..5731e03f74d47a8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2631,6 +2631,16 @@ AS_VAR_IF([ac_cv_gcc_compat], [yes], [
 
     CFLAGS_NODIST="$CFLAGS_NODIST -std=c11"
 
+    AS_IF([test "$MACHDEP" = linux && test "$ac_cv_cc_name" = clang], [
+      AS_CASE([$host_cpu], [loongarch*], [
+        dnl clang/LoongArch emits only .debug_frame by default, which is not
+        dnl available to runtime unwinders such as backtrace().
+        AX_CHECK_COMPILE_FLAG([-funwind-tables], [
+          CFLAGS_NODIST="$CFLAGS_NODIST -funwind-tables"
+        ], [], [-Werror])
+      ])
+    ])
+
     PY_CHECK_CC_WARNING([enable], [extra], [if we can add -Wextra])
     AS_VAR_IF([ac_cv_enable_extra_warning], [yes],
               [CFLAGS_NODIST="$CFLAGS_NODIST -Wextra"])