Re: [PATCH 01/53] selftests/mm: hugetlb-read-hwpoison: add SIGBUS handler

Sarthak Sharma
2026-04-17T12:47:37Z

On 4/6/26 7:46 PM, Mike Rapoport wrote:
> From: "Mike Rapoport (Microsoft)" <rppt@kernel.org>
>
> Access of poisoned memory causes SIGBUS, which terminates the
> hugetlb-read-hwpoison test prematurely.
>
> Add a dummy SIGBUS handler to allow the test to continue regardless of
> SIGBUS.
>
> Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
> ---

I have tested this patch and it behaves as intended.

Before applying the patch, the HWPOISON test terminated with a Bus error
when accessing poisoned memory. After applying the patch, the test
catches SIGBUS, reports it and continues execution without terminating
prematurely.

Tested-by: Sarthak Sharma <sarthak.sharma@arm.com>

> tools/testing/selftests/mm/hugetlb-read-hwpoison.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/tools/testing/selftests/mm/hugetlb-read-hwpoison.c b/tools/testing/selftests/mm/hugetlb-read-hwpoison.c
> index 46230462ad48..6bbf15f78061 100644
> --- a/tools/testing/selftests/mm/hugetlb-read-hwpoison.c
> +++ b/tools/testing/selftests/mm/hugetlb-read-hwpoison.c
> @@ -10,6 +10,7 @@
> #include <sys/statfs.h>
> #include <errno.h>
> #include <stdbool.h>
> +#include <signal.h>
>
> #include "kselftest.h"
>
> @@ -261,6 +262,11 @@ static int create_hugetlbfs_file(struct statfs *file_stat)
> return -1;
> }
>
> +static void sigbus_handler(int sig)
> +{
> + printf(PREFIX "received SIGBUS\n");
> +}
> +
> int main(void)
> {
> int fd;
> @@ -273,6 +279,7 @@ int main(void)
> };
> size_t i;
>
> + signal(SIGBUS, sigbus_handler);
> for (i = 0; i < ARRAY_SIZE(wr_chunk_sizes); ++i) {
> printf("Write/read chunk size=0x%lx\n",
> wr_chunk_sizes[i]);