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Subject[PATCH 4.9 75/83] lib/ubsan.c: dont mark __ubsan_handle_builtin_unreachable as noreturn
4.9-stable review patch.  If anyone has any objections, please let me know.


From: Arnd Bergmann <>

commit 1c23b4108d716cc848b38532063a8aca4f86add8 upstream.

gcc-8 complains about the prototype for this function:

lib/ubsan.c:432:1: error: ignoring attribute 'noreturn' in declaration of a built-in function '__ubsan_handle_builtin_unreachable' because it conflicts with attribute 'const' [-Werror=attributes]

This is actually a GCC's bug. In GCC internals
__ubsan_handle_builtin_unreachable() declared with both 'noreturn' and
'const' attributes instead of only 'noreturn':

Workaround this by removing the noreturn attribute.

[aryabinin: add information about GCC bug in changelog]
Signed-off-by: Arnd Bergmann <>
Signed-off-by: Andrey Ryabinin <>
Acked-by: Olof Johansson <>
Cc: <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
Signed-off-by: Greg Kroah-Hartman <>

lib/ubsan.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

--- a/lib/ubsan.c
+++ b/lib/ubsan.c
@@ -451,8 +451,7 @@ void __ubsan_handle_shift_out_of_bounds(

-void __noreturn
-__ubsan_handle_builtin_unreachable(struct unreachable_data *data)
+void __ubsan_handle_builtin_unreachable(struct unreachable_data *data)
unsigned long flags;

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