Hello Kal,I've noticed that all created processes in your code snippet bound to the same queue without SHARED flag.
Is it supposed to work? Thanks. On 17.10.2019 11:53, Kal Cutter Conley wrote:
Hello, I have managed to extract a reproducer that crashes the kernel. We observe the crash with all drivers that support XDP zerocopy (i40e, ixgbe, mlx5_core). The program source is attached (C++). Compile with a newer clang++ or g++ using flag -std=c++17. It must also be linked with libbpf. Use libbpf v0.0.5 and make sure to revert 5771dacd3dc2fdd041c51242819a9f212e04af55. The crash is a kernel NULL pointer dereference in xsk_umem_consume_tx. Hopefully this is useful, Kal On Wed, Aug 7, 2019 at 10:48 PM Kal Cutter Conley <kal.conley@xxxxxxxxxxx> wrote:Hello, I am trying to get AF_XDP working with the i40e driver (Ethernet Controller X710 for 10GbE SFP+). After bind() with XDP_ZEROCOPY the kernel (machine) freezes hard. I have reproduced this on varying kernel versions between 5.1 and 5.3-rc3 with 5.3 kernels freezing also, but at a later stage. I tried replacing my XDP program with a trivial one that simply returns XDP_PASS but it didn't help. On the same system, the xdpsock sample does appear to work with the -z flag, however. Are there any current known issues that could be causing this? I will try to extract a minimal example that exercises the freeze. Thanks, Kal
-- Best regards, Ilya Golshtein
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