It affects ubuntu-14.04, libnl version 3.2.21 (http://packages.ubuntu.com/trusty/libnl-3-200) The first libnl upstream release which includes these patches is 3.2.25.
The problem happens when the libnl choose a port id already used by another application. The libnl fails instead of trying another port id. Please find enclosed a script to reproduce the problem: $ ./example.sh gcc -o example -I/usr/include/libnl3 example.c -lnl-3 -lnl-genl-3 set manually the local port to 12145 (pid: 12144) local port has been set by the libnl to 12145 (pid: 12145) genl_connect(): Object exists (local port: 12145, pid: 12145) The first instance of example sets manually the port id to pid+1. The second instance of example let the libnl calculate automatically the port id. It chooses by default the pid, which is already used. To summarize, if an application on the system chooses manually a port id (because it does not use the libnl or because it sets it manually), it may conflict with applications that use libnl and prevent them to work properly. ** Attachment added: "example.tar" https://bugs.launchpad.net/ubuntu/+source/libnl3/+bug/1511735/+attachment/4532569/+files/example.tar ** Changed in: libnl3 (Ubuntu) Status: Incomplete => New -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to libnl3 in Ubuntu. https://bugs.launchpad.net/bugs/1511735 Title: libnl: fail to bind() netlink sockets Status in libnl3 package in Ubuntu: New Bug description: The following upstream patches are needed in order to avoid failures when binding a netlink socket: 1f734a8f892a lib/socket: randomize the generated local port http://git.infradead.org/users/tgr/libnl.git/commitdiff/1f734a8f892a 4dd5fdd0af2c lib/socket: retry generate local port in nl_connect on ADDRINUSE http://git.infradead.org/users/tgr/libnl.git/commitdiff/4dd5fdd0af2c 027157898708 lib/socket: don't fail if no more local ports can be assigned in nl_socket_alloc http://git.infradead.org/users/tgr/libnl.git/commitdiff/027157898708 0fd510b3673f lib/socket: use proper typed constant UINT32_MAX for uint32_t typed port http://git.infradead.org/users/tgr/libnl.git/commitdiff/0fd510b3673f Without these patches, an application which opens and closes regularly netlink sockets can easily fails to bind them. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libnl3/+bug/1511735/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
