netdev - Assertion faileda at samples/bpf/test

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Date:   Sun, 2 Oct 2016 14:55:42 +0800
From:   Louie Lu <louie.lu@...ebaytech.com>
To:     netdev@...r.kernel.org
Subject: Assertion faileda at samples/bpf/test_maps

Hi everyone,

I'm now playing net-next samples/bpf things, and I found that
test_maps will give an assertion

```
test_maps: /home/grd/linux/net-next/samples/bpf/test_maps.c:146:
test_percpu_hashmap_sanity: Assertion `bpf_lookup_elem(map_fd, &key,
value) == -1 && errno == ENOENT' failed.
[1]    20706 abort (core dumped)  ./test_maps
```

I've done the check at [[iovisor-dev] Assertion fails at
samples/bpf/test_maps](http://lists.iovisor.org/pipermail/iovisor-dev/2016-June/000281.html)
which tells me to set ulimit to unlimited or patching by setrlimit().

The problem is bpf_lookup_elem return -1, and errno return 0.

I'm using Intel(R) Core(TM) i7-2640M and net-next commit:
803783849fed11, 4.8.0-rc7-ARCH-02283-g8037838.

And, a strange this is when I done this at QEMU, test_maps perform
will and pass the test.

Is that my hardware problem or something else?

Thanks.

Louie Lu.