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selftests/bpf: Verify no warning when close fexit link

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Add a test to verify that there's no WARNING when detaching fexit link by
following the repro steps of previous commit.

Without the fix, the WARNING could be triggered by this test.

Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Reviewed-by: Pu Lehui <pulehui@huawei.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/bpf/20260722151909.69142-3-leon.hwang@linux.dev
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
This commit is contained in:
Leon Hwang
2026-07-22 23:19:09 +08:00
committed by Kumar Kartikeya Dwivedi
parent 61aaa8782b
commit 09e074666b
1 changed files with 48 additions and 0 deletions
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48
tools/testing/selftests/bpf/prog_tests/tailcalls.c
View File

@@ -13,6 +13,8 @@
#include "tailcall_cgrp_storage.skel.h"
#include "tailcall_sleepable.skel.h"
#include "tailcall_callback.skel.h"
#include "tailcall_bpf2bpf2.skel.h"
#include "tailcall_bpf2bpf_fexit.skel.h"
/* test_tailcall_1 checks basic functionality by patching multiple locations
* in a single program for a single tail call slot with nop->jmp, jmp->nop
@@ -1907,6 +1909,50 @@ static void test_tailcall_callback(void)
RUN_TESTS(tailcall_callback);
}
static void test_tailcall_bpf2bpf_fexit_links(void)
{
struct tailcall_bpf2bpf_fexit *skel1 = NULL, *skel2 = NULL;
struct tailcall_bpf2bpf2 *skel_tc;
int err, prog_fd;
skel_tc = tailcall_bpf2bpf2__open_and_load();
if (!ASSERT_OK_PTR(skel_tc, "tailcall_bpf2bpf2__open_and_load"))
return;
skel1 = tailcall_bpf2bpf_fexit__open();
if (!ASSERT_OK_PTR(skel1, "tailcall_bpf2bpf_fexit__open"))
goto out;
prog_fd = bpf_program__fd(skel_tc->progs.classifier_0);
err = bpf_program__set_attach_target(skel1->progs.fexit, prog_fd, "subprog_tail");
if (!ASSERT_OK(err, "bpf_program__set_attach_target"))
goto out;
err = tailcall_bpf2bpf_fexit__load(skel1);
if (!ASSERT_OK(err, "tailcall_bpf2bpf_fexit__load"))
goto out;
skel1->links.fexit = bpf_program__attach_trace(skel1->progs.fexit);
if (!ASSERT_OK_PTR(skel1->links.fexit, "bpf_program__attach_trace"))
goto out;
skel2 = tailcall_bpf2bpf_fexit__open();
if (!ASSERT_OK_PTR(skel2, "tailcall_bpf2bpf_fexit__open"))
goto out;
err = bpf_program__set_attach_target(skel2->progs.fexit, prog_fd, "subprog_tail");
if (!ASSERT_OK(err, "bpf_program__set_attach_target"))
goto out;
err = tailcall_bpf2bpf_fexit__load(skel2);
ASSERT_OK(err, "tailcall_bpf2bpf_fexit__load");
out:
tailcall_bpf2bpf_fexit__destroy(skel1);
tailcall_bpf2bpf_fexit__destroy(skel2);
tailcall_bpf2bpf2__destroy(skel_tc);
}
void test_tailcalls(void)
{
if (test__start_subtest("tailcall_1"))
@@ -1974,4 +2020,6 @@ void test_tailcalls(void)
if (test__start_subtest("tailcall_cgrp_storage_no_storage_bridge"))
test_tailcall_cgrp_storage_no_storage_bridge();
test_tailcall_callback();
if (test__start_subtest("tailcall_bpf2bpf_fexit_links"))
test_tailcall_bpf2bpf_fexit_links();
}