Dan Streetman edaafa805e net: tcp: close sock if net namespace is exiting ... [ Upstream commit 4ee806d51176ba7b8ff1efd81f271d7252e03a1d ] When a tcp socket is closed, if it detects that its net namespace is exiting, close immediately and do not wait for FIN sequence. For normal sockets, a reference is taken to their net namespace, so it will never exit while the socket is open. However, kernel sockets do not take a reference to their net namespace, so it may begin exiting while the kernel socket is still open. In this case if the kernel socket is a tcp socket, it will stay open trying to complete its close sequence. The sock's dst(s) hold a reference to their interface, which are all transferred to the namespace's loopback interface when the real interfaces are taken down. When the namespace tries to take down its loopback interface, it hangs waiting for all references to the loopback interface to release, which results in messages like: unregister_netdevice: waiting for lo to become free. Usage count = 1 These messages continue until the socket finally times out and closes. Since the net namespace cleanup holds the net_mutex while calling its registered pernet callbacks, any new net namespace initialization is blocked until the current net namespace finishes exiting. After this change, the tcp socket notices the exiting net namespace, and closes immediately, releasing its dst(s) and their reference to the loopback interface, which lets the net namespace continue exiting. Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1711407 Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=97811 Signed-off-by: Dan Streetman <ddstreet@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-01-31 12:06:14 +01:00
..
9p	9p: switch p9_client_read() to passing struct iov_iter *	2015-04-11 22:28:27 -04:00
bluetooth	Bluetooth: L2CAP: Fix returning correct LE CoC response codes	2015-11-05 04:04:00 +01:00
caif	caif: fix a signedness bug in cfpkt_iterate()	2015-02-20 17:35:14 -05:00
irda	irda: Convert function pointer arrays and uses to const	2014-12-10 15:33:16 -05:00
iucv	s390/iucv: do not use arrays as argument	2015-09-21 16:03:04 -07:00
netfilter	netfilter: nf_tables: add clone interface to expression operations	2015-11-10 23:47:32 +01:00
netns	Revert "ipv4/icmp: redirect messages can use the ingress daddr as source"	2015-10-14 06:01:07 -07:00
nfc	NFC: nci: non-static functions can not be inline	2015-10-28 06:44:45 +01:00
phonet
sctp	sctp: potential read out of bounds in sctp_ulpevent_type_enabled()	2017-10-21 17:09:01 +02:00
tc_act	act_connmark: Remember the struct net instead of guessing it.	2015-09-18 21:59:31 +02:00
6lowpan.h	6lowpan: remove lowpan_is_addr_broadcast	2015-10-21 00:49:25 +02:00
act_api.h	net_sched: make tcf_hash_destroy() static	2015-08-26 11:01:44 -07:00
addrconf.h	ipv6: reorder ip6_route_dev_notifier after ipv6_dev_notf	2017-05-14 13:32:58 +02:00
af_ieee802154.h	ieee802154: af_ieee802154: fix typo in comment.	2015-09-17 13:20:05 +02:00
af_rxrpc.h
af_unix.h	af_unix: split 'u->readlock' into two: 'iolock' and 'bindlock'	2016-09-30 10:18:36 +02:00
af_vsock.h	VSOCK: define VSOCK_SS_LISTEN once only	2015-11-01 12:14:47 -05:00
ah.h	ipsec: Remove obsolete MAX_AH_AUTH_LEN	2014-09-18 10:54:36 +02:00
arp.h	ipv4: Make neigh lookup keys for loopback/point-to-point devices be INADDR_ANY	2018-01-31 12:06:14 +01:00
atmclip.h
ax25.h	ax25: Stop using sock->sk_protinfo.	2015-06-28 16:55:44 -07:00
ax88796.h
bond_3ad.h	bonding: simplify / unify event handling code for 3ad mode.	2015-11-02 22:52:24 -05:00
bond_alb.h	net: Move bonding headers under include/net	2014-11-10 13:27:49 -05:00
bond_options.h	bonding: convert num_grat_arp to the new bonding option API	2015-07-27 01:05:24 -07:00
bonding.h	bonding: fix bond_get_stats()	2016-04-20 15:42:04 +09:00
busy_poll.h
cfg80211-wext.h
cfg80211.h	cfg80211/mac80211: fix BSS leaks when abandoning assoc attempts	2017-01-09 08:07:42 +01:00
cfg802154.h	nl802154: add support for security layer	2015-09-30 13:16:44 +02:00
checksum.h	net: Add inet_proto_csum_replace_by_diff utility function	2015-08-17 21:33:06 -07:00
cipso_ipv4.h	netlabel: out of bound access in cipso_v4_validate()	2017-02-18 16:39:26 +01:00
cls_cgroup.h	cls_cgroup: factor out classid retrieval	2015-07-20 12:41:30 -07:00
codel.h	net_sched: update hierarchical backlog too	2016-05-18 17:06:39 -07:00
compat.h	net: switch importing msghdr from userland to {compat_,}import_iovec()	2015-04-09 00:02:26 -04:00
datalink.h
dcbevent.h
dcbnl.h	net/dcb: Add IEEE QCN attribute	2015-03-06 21:50:02 -05:00
dn.h
dn_dev.h
dn_fib.h
dn_neigh.h	netfilter: Pass net into okfn	2015-09-17 17:18:37 -07:00
dn_nsp.h
dn_route.h
dsa.h	net: dsa: use switchdev obj for VLAN add/del ops	2015-11-01 15:56:11 -05:00
dsfield.h
dst.h	ipv4: add reference counting to metrics	2017-06-07 12:05:59 +02:00
dst_metadata.h	gro: Make GRO aware of lightweight tunnels.	2016-03-03 15:07:04 -08:00
dst_ops.h	ipv4, ipv6: Pass net into __ip_local_out and __ip6_local_out	2015-10-08 04:27:02 -07:00
esp.h
ethoc.h	net/ethoc: support big-endian register layout	2015-09-23 15:33:15 -07:00
fib_rules.h	net: ipv6: use common fib_default_rule_pref	2015-09-09 14:19:50 -07:00
firewire.h
flow.h	net: Rename FLOWI_FLAG_VRFSRC to FLOWI_FLAG_L3MDEV_SRC	2015-10-07 04:27:42 -07:00
flow_dissector.h	flow_dissector: Don't use bit fields.	2015-09-01 16:46:08 -07:00
flowcache.h
fou.h	ip_tunnel: Ops registration for secondary encap (fou, gue)	2014-11-12 15:01:35 -05:00
garp.h
gen_stats.h	net: sched: enable per cpu qstats	2014-09-30 01:02:26 -04:00
genetlink.h	netlink: add a start callback for starting a netlink dump	2017-12-05 11:22:49 +01:00
geneve.h	geneve: Consolidate Geneve functionality in single module.	2015-08-27 15:42:48 -07:00
gre.h	gre: Remove support for sharing GRE protocol hook.	2015-08-10 14:03:54 -07:00
gro_cells.h	gro_cells: remove spinlock protecting receive queues	2015-08-31 15:17:17 -07:00
gue.h	gue: Protocol constants for remote checksum offload	2014-11-05 16:30:03 -05:00
icmp.h
ieee80211_radiotap.h
ieee802154_netdev.h	nl802154: add support for security layer	2015-09-30 13:16:44 +02:00
if_inet6.h	ipv6: do retries on stable privacy addresses	2015-03-23 22:12:09 -04:00
inet6_connection_sock.h	ipv6: remove obsolete inet6 functions	2015-10-03 04:32:42 -07:00
inet6_hashtables.h	ipv6: get rid of __inet6_hash()	2015-03-18 22:00:35 -04:00
inet_common.h	net: avoid NULL deref in inet_ctl_sock_destroy()	2015-11-02 22:46:09 -05:00
inet_connection_sock.h	tcp/dccp: fix another race at listener dismantle	2016-03-03 15:07:07 -08:00
inet_ecn.h	ipv6: update skb->csum when CE mark is propagated	2016-01-31 11:29:01 -08:00
inet_frag.h	Revert "net: fix percpu memory leaks"	2017-09-27 11:00:11 +02:00
inet_hashtables.h	tcp/dccp: fix hashdance race for passive sessions	2015-10-23 05:42:21 -07:00
inet_sock.h	tcp/dccp: fix other lockdep splats accessing ireq_opt	2017-11-18 11:11:07 +01:00
inet_timewait_sock.h	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2015-10-20 06:08:27 -07:00
inetpeer.h	inet: tcp: fix inetpeer_set_addr_v4()	2015-12-16 00:14:12 -05:00
ip.h	ipv4: igmp: guard against silly MTU values	2018-01-02 20:33:24 +01:00
ip6_checksum.h	net: add gro_compute_pseudo functions	2014-08-24 18:09:23 -07:00
ip6_fib.h	ipv6: fix sparse warning on rt6i_node	2017-09-27 11:00:10 +02:00
ip6_route.h	net: ipv6: Compare lwstate in detecting duplicate nexthops	2017-07-21 07:44:55 +02:00
ip6_tunnel.h	ip6_tunnel: Clear IP6CB in ip6tunnel_xmit()	2016-11-21 10:06:39 +01:00
ip_fib.h	ipv4: add reference counting to metrics	2017-06-07 12:05:59 +02:00
ip_tunnels.h	tunnels: Remove encapsulation offloads on decap.	2016-10-31 04:13:59 -06:00
ip_vs.h	ipvs: drop first packet to redirect conntrack	2016-05-11 11:21:09 +02:00
ipcomp.h
ipconfig.h
ipv6.h	ipv6: Fix getsockopt() for sockets with default IPV6_AUTOFLOWLABEL	2018-01-31 12:06:12 +01:00
ipx.h	switch ipxrtr_route_packet() from iovec to msghdr	2014-11-24 04:28:49 -05:00
iw_handler.h	wext: handle NULL extra data in iwe_stream_add_point better	2017-08-11 09:08:56 -07:00
l3mdev.h	net: Propagate lookup failure in l3mdev_get_saddr to caller	2016-01-04 22:58:30 -05:00
lapb.h
lib80211.h	lib80211: remove unused print_ssid()	2014-10-14 02:18:27 +02:00
llc.h
llc_c_ac.h
llc_c_ev.h
llc_c_st.h	llc: Make llc_conn_ev_qfyr_t function pointer arrays const	2014-12-10 15:21:24 -05:00
llc_conn.h	net: Pass kern from net_proto_family.create to sk_alloc	2015-05-11 10:50:17 -04:00
llc_if.h
llc_pdu.h
llc_s_ac.h
llc_s_ev.h
llc_s_st.h	llc: Make llc_sap_action_t function pointer arrays const	2014-12-10 15:21:24 -05:00
llc_sap.h
lwtunnel.h	dst: Pass net into dst->output	2015-10-08 04:27:03 -07:00
mac80211.h	mac80211: RX BA support for sta max_rx_aggregation_subframes	2017-05-20 14:27:03 +02:00
mac802154.h	6lowpan: cleanup lowpan_header_decompress	2015-10-21 00:49:24 +02:00
mip6.h
mld.h	ipv6: mld: answer mldv2 queries with mldv1 reports in mldv1 fallback	2014-09-22 16:23:15 -04:00
mpls.h	openvswitch: Add basic MPLS support to kernel	2014-11-05 23:52:33 -08:00
mpls_iptunnel.h	mpls: multipath route support	2015-10-23 06:26:42 -07:00
mrp.h
ndisc.h	Revert "ipv6: ndisc: inherit metadata dst when creating ndisc requests"	2015-12-01 15:07:59 -05:00
neighbour.h	net: add explicit logging and stat for neighbour table overflow	2015-08-10 13:46:21 -07:00
net_namespace.h	net: tcp: close sock if net namespace is exiting	2018-01-31 12:06:14 +01:00
net_ratelimit.h
netevent.h
netlabel.h	netlabel: fix the netlbl_catmap_setlong() dummy function	2014-08-07 20:55:21 -04:00
netlink.h	netlink: add nla_get for le32 and le64	2015-09-30 13:16:44 +02:00
netprio_cgroup.h
netrom.h
nexthop.h
nl802154.h	nl802154: add support for security layer	2015-09-30 13:16:44 +02:00
p8022.h
ping.h	net: Remove iocb argument from sendmsg and recvmsg	2015-03-02 13:06:31 -05:00
pkt_cls.h	net: sched: remove tcf_proto from ematch calls	2014-10-06 18:02:32 -04:00
pkt_sched.h	net: sched: consolidate tc_classify{,_compat}	2015-08-27 14:18:48 -07:00
protocol.h	net: Eliminate no_check from protosw	2014-05-23 16:28:53 -04:00
psnap.h
raw.h
rawv6.h
red.h
regulatory.h	cfg80211: allow wiphy specific regdomain management	2014-12-17 11:49:55 +01:00
request_sock.h	tcp/dccp: fix race at listener dismantle phase	2015-10-16 00:52:19 -07:00
rose.h
route.h	net: Propagate lookup failure in l3mdev_get_saddr to caller	2016-01-04 22:58:30 -05:00
rtnetlink.h	netlink: Rightsize IFLA_AF_SPEC size calculation	2015-10-21 19:15:20 -07:00
sch_generic.h	net_sched: fix order of queue length updates in qdisc_replace()	2017-08-30 10:19:21 +02:00
scm.h	unix: correctly track in-flight fds in sending process user_struct	2016-03-03 15:07:05 -08:00
secure_seq.h	inetpeer: get rid of ip_id_count	2014-06-02 11:00:41 -07:00
slhc_vj.h
snmp.h	Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2014-10-15 07:48:18 +02:00
sock.h	net: avoid sk_forward_alloc overflows	2016-11-15 07:46:36 +01:00
Space.h
stp.h
switchdev.h	switchdev: pass pointer to fib_info instead of copy	2016-06-24 10:18:16 -07:00
tcp.h	tcp: fix tcp_mtu_probe() vs highest_sack	2017-11-18 11:11:05 +01:00
tcp_memcontrol.h
tcp_states.h	inet: add TCP_NEW_SYN_RECV state	2015-03-12 22:58:12 -04:00
timewait_sock.h	inet: remove BUG_ON() in twsk_destructor()	2015-07-09 15:12:20 -07:00
transp_v6.h
tso.h	net: tso: add support for IPv6	2015-10-26 22:24:22 -07:00
udp.h	net: Remove iocb argument from sendmsg and recvmsg	2015-03-02 13:06:31 -05:00
udp_tunnel.h	vxlan: do not receive IPv4 packets on IPv6 socket	2015-08-29 13:07:54 -07:00
udplite.h	net: switch memcpy_fromiovec()/memcpy_fromiovecend() users to copy_from_iter()	2015-02-04 01:34:15 -05:00
vsock_addr.h
vxlan.h	vxlan: fix incorrect RCO bit in VXLAN header	2015-12-05 18:15:29 -05:00
wext.h
wimax.h	net: treewide: Fix typo found in DocBook/networking.xml	2014-09-05 17:35:28 -07:00
x25.h
x25device.h
xfrm.h	xfrm: fix stack access out of bounds with CONFIG_XFRM_SUB_POLICY	2017-07-05 14:37:21 +02:00