To provoke this bug, remember that you MUST call:
make headers_install
In the kernels root directory, else you will be compiling samples/bpf/
against the older headers previously installed.
The error looks like:
$ sudo ./sockex1
bpf_load_program() err=22
fd 0 is not pointing to valid bpf_map
sockex1: [...]/samples/bpf/sockex1_user.c:26: main: Assertion
`setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, prog_fd, sizeof(prog_fd[0])) == 0'
failed.
Aborted
I've found that the bug were introduced in
commit: fb30d4b71214 ("bpf: Add tests for map-in-map")
--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
LinkedIn: http://www.linkedin.com/in/brouer
