diff mbox series

[bpf-next,v6,2/2] selftests/bpf: Remove flaky test_btf_id test

Message ID 20231214203820.1469402-1-yonghong.song@linux.dev (mailing list archive)
State Accepted
Commit 56925f389e152dcb8d093435d43b78a310539c23
Delegated to: BPF
Headers show
Series [bpf-next,v6,1/2] bpf: Fix a race condition between btf_put() and map_free() | expand

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netdev/series_format success Single patches do not need cover letters
netdev/tree_selection success Clearly marked for bpf-next
netdev/ynl success SINGLE THREAD; Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 8 this patch: 8
netdev/cc_maintainers warning 11 maintainers not CCed: kpsingh@kernel.org sdf@google.com martin.lau@linux.dev mykolal@fb.com song@kernel.org haoluo@google.com iii@linux.ibm.com jolsa@kernel.org linux-kselftest@vger.kernel.org shuah@kernel.org john.fastabend@gmail.com
netdev/build_clang success Errors and warnings before: 8 this patch: 8
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netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
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netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Yonghong Song Dec. 14, 2023, 8:38 p.m. UTC 
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>
---
 tools/testing/selftests/bpf/prog_tests/btf.c | 5 -----
 1 file changed, 5 deletions(-)
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/prog_tests/btf.c b/tools/testing/selftests/bpf/prog_tests/btf.c
index 8fb4a04fbbc0..816145bcb647 100644
--- a/tools/testing/selftests/bpf/prog_tests/btf.c
+++ b/tools/testing/selftests/bpf/prog_tests/btf.c
@@ -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");