selftests/bpf: Fix htab_update/reenter_update selftest failure #10303
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Since commit 31158ad ("rqspinlock: Add deadlock detection and recovery") the updated path on re-entrancy now reports deadlock via -EDEADLK instead of the previous -EBUSY. Also, the way reentrancy was exercised (via fentry/lookup_elem_raw) has been fragile because lookup_elem_raw may be inlined (find_kernel_btf_id() will return -ESRCH). To fix this fentry is attached to bpf_obj_free_fields() instead of lookup_elem_raw() and: - The htab map is made to use a BTF-described struct val with a struct bpf_timer so that check_and_free_fields() reliably calls bpf_obj_free_fields() on element replacement. - The selftest is updated to do two updates to the same key (insert + replace) in prog_test. - The selftest is updated to align with expected errno with the kernel’s current behavior. Signed-off-by: Saket Kumar Bhaskar <[email protected]> Tested-by: Venkat Rao Bagalkote <[email protected]>
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Pull request for series with
subject: selftests/bpf: Fix htab_update/reenter_update selftest failure
version: 3
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1024103