[libvirt] virNetSocketNewListenTCP tries just one address

[Olaf Hering]

To rescue this bug from the noise in a subthread:

If a hostname resolves to more than one address and the host currently
configured itself for just IPv4, doing a bind() to some IPv6 address
will fail. As a result an error is returned instead of continuing with
the next item in 'runp'.

> Mär 20 09:35:52 macintyre-old libvirtd[4527]: 2018-03-20 08:35:52.521+0000: 4531: error : virNetSocketNewListenTCP:389 : Unable to bind to port: Cannot assign requested address

After further debugging:

27672 16:04:46.774906 socket(PF_INET6, SOCK_STREAM, IPPROTO_TCP) = 35
27672 16:04:46.775041 setsockopt(35, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
27672 16:04:46.775172 setsockopt(35, SOL_IPV6, IPV6_V6ONLY, [1], 4) = 0
27672 16:04:46.775302 bind(35, {sa_family=AF_INET6, sin6_port=htons(49152), inet_pton(AF_INET6, "2620:113:80c0:8000:10:161:8:197", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = -1 EADDRNOTAVAIL (Cannot assign requested address)
27672 16:04:46.775455 gettid()          = 27672
27672 16:04:46.775590 write(4, "2018-03-20 15:04:46.775+0000: 27672: error : virNetSocketNewListenTCP:389 : Unable to bind to port: Cannot assign requested address\n", 132) = 132
27672 16:04:46.775742 gettid()          = 27672
27672 16:04:46.775875 write(4, "2018-03-20 15:04:46.775+0000: 27672: info : virObjectUnref:350 : OBJECT_UNREF: obj=0x7fa4bc003530\n", 98) = 98
27672 16:04:46.776026 gettid()          = 27672

So for some reason libvirtd tries to bind to ipv6 even if the host does
not have that ipv6 address at this point, only the link-local address.
Not sure if there is a way to detect that within libvirt. Perhaps it
should just move on with the runp list and try the next one?
 
Olaf
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 195 bytes
Desc: not available
URL: <http://listman.redhat.com/archives/libvir-list/attachments/20180327/a92d172c/attachment-0001.sig>