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selftests/bpf: Remove flaky test_btf_id test 

With previous patch, one of subtests in test_btf_id becomes
flaky and may fail. The following is a failing example:

  Error: #26 btf
  Error: #26/174 btf/BTF ID
    Error: #26/174 btf/BTF ID
    btf_raw_create:PASS:check 0 nsec
    btf_raw_create:PASS:check 0 nsec
    test_btf_id:PASS:check 0 nsec
    ...
    test_btf_id:PASS:check 0 nsec
    test_btf_id:FAIL:check BTF lingersdo_test_get_info:FAIL:check failed: -1

The test tries to prove a btf_id not available after the map is closed.
But btf_id is freed only after workqueue and a rcu grace period, compared
to previous case just after a rcu grade period.
Depending on system workload, workqueue could take quite some time
to execute function bpf_map_free_deferred() which may cause the test failure.
Instead of adding arbitrary delays, let us remove the logic to
check btf_id availability after map is closed.

Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20231214203820.1469402-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yonghong Song 2023-12-14 12:38:20 -08:00 committed by Alexei Starovoitov
parent 59e5791f59
commit 56925f389e
1 changed files with 0 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
tools/testing/selftests/bpf/prog_tests/btf.c
View File

@ -4630,11 +4630,6 @@ static int test_btf_id(unsigned int test_num)
/* The map holds the last ref to BTF and its btf_id */
close(map_fd);
map_fd = -1;
btf_fd[0] = bpf_btf_get_fd_by_id(map_info.btf_id);
if (CHECK(btf_fd[0] >= 0, "BTF lingers")) {
err = -1;
goto done;
}
fprintf(stderr, "OK");