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From ecb72e6699f4f8525115e0b42f81121a1cf8eefa Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
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Date: Tue, 15 Sep 2020 14:59:58 +0200
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Subject: [PATCH 2/2] mpl: do not require non-loopback networking
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getaddrinfo(3) says:
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If hints.ai_flags includes the AI_ADDRCONFIG flag, then IPv4
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addresses are returned in the list pointed to by res only if the
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local system has at least one IPv4 address configured, and IPv6
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addresses are returned only if the local system has at least one
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IPv6 address configured. The loopback address is not considered for
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this case as valid as a configured address.
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This means that MPL_get_sockaddr() will fail to resolve the local host
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(either as "localhost" or by the actual hostname) on a system that has
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no non-loopback networking. This break exection of mpirun e.g. in a
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container for tests and such.
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From https://bugzilla.redhat.com/show_bug.cgi?id=1839007:
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<mock-chroot> sh-5.0# hostname
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68da8e7c62a2404bb4bf75c9ce643e06
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<mock-chroot> sh-5.0# module load mpi/mpich-x86_64
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<mock-chroot> sh-5.0# mpirun ./a.out
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Fatal error in PMPI_Init: Other MPI error, error stack:
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MPIR_Init_thread(586)..............:
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MPID_Init(224).....................: channel initialization failed
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MPIDI_CH3_Init(105)................:
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MPID_nem_init(324).................:
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MPID_nem_tcp_init(175).............:
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MPID_nem_tcp_get_business_card(404):
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MPID_nem_tcp_init(375).............: gethostbyname failed, 68da8e7c62a2404bb4bf75c9ce643e06 (errno 0)
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<mock-chroot> sh-5.0# ip a
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1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
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link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
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inet 127.0.0.1/8 scope host lo
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valid_lft forever preferred_lft forever
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inet6 ::1/128 scope host
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valid_lft forever preferred_lft forever
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---
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src/mpl/src/sock/mpl_sockaddr.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/mpl/src/sock/mpl_sockaddr.c b/src/mpl/src/sock/mpl_sockaddr.c
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index 9334cc4fb2..c0e991c68d 100644
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--- a/src/mpl/src/sock/mpl_sockaddr.c
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+++ b/src/mpl/src/sock/mpl_sockaddr.c
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@@ -98,7 +98,7 @@ int MPL_get_sockaddr(const char *s_hostname, MPL_sockaddr_t * p_addr)
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ai_hint.ai_family = af_type;
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ai_hint.ai_socktype = SOCK_STREAM;
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ai_hint.ai_protocol = IPPROTO_TCP;
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- ai_hint.ai_flags = AI_ADDRCONFIG | AI_V4MAPPED;
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+ ai_hint.ai_flags = AI_V4MAPPED;
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ret = getaddrinfo(s_hostname, NULL, &ai_hint, &ai_list);
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if (ret) {
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return ret;
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