Re: [PATCH bpf v2 1/2] selftests/bpf: add a test for subprogram extables

On 6/7/23 2:04 PM, Krister Johansen wrote:

In certain situations a program with subprograms may have a NULL extable entry. This should not happen, and when it does, it turns a single trap into multiple. Add a test case for further debugging and to prevent regressions. N.b: without any other patches this can panic or oops a kernel.

Also, it would be great if you can show the kernel oops stack trace.

Signed-off-by: Krister Johansen kjlx@templeofstupid.com

.../bpf/prog_tests/subprogs_extable.c | 35 +++++++++ .../bpf/progs/test_subprogs_extable.c | 71 +++++++++++++++++++ 2 files changed, 106 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/subprogs_extable.c create mode 100644 tools/testing/selftests/bpf/progs/test_subprogs_extable.c

[...]