1. fix recursive lock when ebpf prog return SK_PASS.
2. add selftest to reproduce recursive lock.

Note that the test code can reproduce the 'dead-lock' and if just
the selftest merged without first patch, the test case will
definitely fail, because the issue of deadlock is inevitable.

---
v2->v4: fix line length reported by patchwork and remove unused code.
        (max_line_length is set to 80 in patchwork but default is 100 in kernel tree)
v1->v2: 1.inspired by martin.lau to add selftest to reproduce the issue.
        2. follow the community rules for patch.
        v1: https://lore.kernel.org/bpf/55fc6114-7e64-4b65-86d2-92cfd1e9e92f@linux.dev/T/#u
---

Jiayuan Chen (2):
  bpf: fix recursive lock when verdict program return SK_PASS
  selftests/bpf: Add some tests with sockmap SK_PASS

 net/core/skmsg.c                              |  4 +-
 .../selftests/bpf/prog_tests/sockmap_basic.c  | 54 +++++++++++++++++++
 2 files changed, 56 insertions(+), 2 deletions(-)

-- 
2.43.5

On 11/17/24 7:09 PM, Jiayuan Chen wrote:
> 1. fix recursive lock when ebpf prog return SK_PASS.
> 2. add selftest to reproduce recursive lock.
> 
> Note that the test code can reproduce the 'dead-lock' and if just
> the selftest merged without first patch, the test case will
> definitely fail, because the issue of deadlock is inevitable.

Acked-by: Martin KaFai Lau <martin.lau@kernel.org>

Jakub, please help to land it to the net tree. Thanks!