netdev - bpf: samples/bpf/sockex2: Assertion `setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, prog_fd, sizeof(prog

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Date:   Mon, 23 Apr 2018 10:56:24 +0800
From:   "Wang Sheng-Hui" <shhuiw@...mail.com>
To:     "ast" <ast@...nel.org>,
        "daniel" <daniel@...earbox.net>,
        "netdev" <netdev@...r.kernel.org>
Subject: bpf: samples/bpf/sockex2:  Assertion `setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, prog_fd, sizeof(prog_fd[0])) == 0' failed.

Sorry to trouble you!

I run samples/bpf/sockex2 failed with 
"Assertion `setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, prog_fd, sizeof(prog_fd[0])) == 0' failed."

Then I run " strace ./sockex2" and got:
...
bind(3, {sa_family=AF_PACKET, sll_protocol=htons(ETH_P_ALL), sll_ifindex=if_nametoindex("lo"), sll_hatype=ARPHRD_NETROM, sll_pkttype=PACKET_HOST, sll_halen=0}, 20) = 0
setsockopt(3, SOL_SOCKET, SO_ATTACH_BPF, [0], 4) = -1 EINVAL (Invalid argument)
write(2, "sockex2: /root/linux/samples/bpf"..., 156sockex2: /root/linux/samples/bpf/sockex2_user.c:35: main: Assertion `setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, prog_fd, sizeof(prog_fd[0])) == 0' failed.
) = 156
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb8ec4bf000
rt_sigprocmask(SIG_UNBLOCK, [ABRT], NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1], [], 8) = 0
getpid()                                = 3513
gettid()                                = 3513
tgkill(3513, 3513, SIGABRT)             = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
--- SIGABRT {si_signo=SIGABRT, si_code=SI_TKILL, si_pid=3513, si_uid=0} ---
+++ killed by SIGABRT +++
Aborted


I tried to find out the root cause but failed:
sockex2 is similar with sockex1, except it run with large bpf code and hash map.
Both can pass the program load phase and open raw socket, so I think there is nothing
wrong with memcharge and other checks.
While sockex1 can work, sockext2 failed with BPF attach to socket.
I read though the sock attach code path and didn't find any specific check to report failures. 

Can someone help to fix the failure, please?

Thanks,
shenghui