linux-kernel - [PATCH 4.14 121/496] selftests/bpf/test_maps: exit child process without error in ENOMEM case

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Date:   Mon, 28 May 2018 11:58:26 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Philip Li <philip.li@...el.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Li Zhijian <zhijianx.li@...el.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 121/496] selftests/bpf/test_maps: exit child process without error in ENOMEM case

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Li Zhijian <zhijianx.li@...el.com>

[ Upstream commit 80475c48c6a8a65171e035e0915dc7996b5a0a65 ]

test_maps contains a series of stress tests, and previously it will break the
rest tests when it failed to alloc memory.
-----------------------
Failed to create hashmap key=8 value=262144 'Cannot allocate memory'
Failed to create hashmap key=16 value=262144 'Cannot allocate memory'
Failed to create hashmap key=8 value=262144 'Cannot allocate memory'
Failed to create hashmap key=8 value=262144 'Cannot allocate memory'
test_maps: test_maps.c:955: run_parallel: Assertion `status == 0' failed.
Aborted
not ok 1..3 selftests:  test_maps [FAIL]
-----------------------
after this patch, the rest tests will be continue when it occurs an ENOMEM failure

CC: Alexei Starovoitov <alexei.starovoitov@...il.com>
CC: Philip Li <philip.li@...el.com>
Suggested-by: Daniel Borkmann <daniel@...earbox.net>
Signed-off-by: Li Zhijian <zhijianx.li@...el.com>
Signed-off-by: Daniel Borkmann <daniel@...earbox.net>

Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 tools/testing/selftests/bpf/test_maps.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/tools/testing/selftests/bpf/test_maps.c
+++ b/tools/testing/selftests/bpf/test_maps.c
@@ -126,6 +126,8 @@ static void test_hashmap_sizes(int task,
 			fd = bpf_create_map(BPF_MAP_TYPE_HASH, i, j,
 					    2, map_flags);
 			if (fd < 0) {
+				if (errno == ENOMEM)
+					return;
 				printf("Failed to create hashmap key=%d value=%d '%s'\n",
 				       i, j, strerror(errno));
 				exit(1);