Benjamin Block 793c3b4000 net: ipv6: fib: don't sleep inside atomic lock ... The function fib6_commit_metrics() allocates a piece of memory in mode GFP_KERNEL while holding an atomic lock from higher up in the stack, in the function __ip6_ins_rt(). This produces the following BUG: > BUG: sleeping function called from invalid context at mm/slub.c:1250 > in_atomic(): 1, irqs_disabled(): 0, pid: 2909, name: dhcpcd > 2 locks held by dhcpcd/2909: > #0: (rtnl_mutex){+.+.+.}, at: [<ffffffff81978e67>] rtnl_lock+0x17/0x20 > #1: (&tb->tb6_lock){++--+.}, at: [<ffffffff81a6951a>] ip6_route_add+0x65a/0x800 > CPU: 1 PID: 2909 Comm: dhcpcd Not tainted 3.17.0-rc1 #1 > Hardware name: ASUS All Series/Q87T, BIOS 0216 10/16/2013 > 0000000000000008 ffff8800c8f13858 ffffffff81af135a 0000000000000000 > ffff880212202430 ffff8800c8f13878 ffffffff810f8d3a ffff880212202c98 > 0000000000000010 ffff8800c8f138c8 ffffffff8121ad0e 0000000000000001 > Call Trace: > [<ffffffff81af135a>] dump_stack+0x4e/0x68 > [<ffffffff810f8d3a>] __might_sleep+0x10a/0x120 > [<ffffffff8121ad0e>] kmem_cache_alloc_trace+0x4e/0x190 > [<ffffffff81a6bcd6>] ? fib6_commit_metrics+0x66/0x110 > [<ffffffff81a6bcd6>] fib6_commit_metrics+0x66/0x110 > [<ffffffff81a6cbf3>] fib6_add+0x883/0xa80 > [<ffffffff81a6951a>] ? ip6_route_add+0x65a/0x800 > [<ffffffff81a69535>] ip6_route_add+0x675/0x800 > [<ffffffff81a68f2a>] ? ip6_route_add+0x6a/0x800 > [<ffffffff81a6990c>] inet6_rtm_newroute+0x5c/0x80 > [<ffffffff8197cf01>] rtnetlink_rcv_msg+0x211/0x260 > [<ffffffff81978e67>] ? rtnl_lock+0x17/0x20 > [<ffffffff81119708>] ? lock_release_holdtime+0x28/0x180 > [<ffffffff81978e67>] ? rtnl_lock+0x17/0x20 > [<ffffffff8197ccf0>] ? __rtnl_unlock+0x20/0x20 > [<ffffffff819a989e>] netlink_rcv_skb+0x6e/0xd0 > [<ffffffff81978ee5>] rtnetlink_rcv+0x25/0x40 > [<ffffffff819a8e59>] netlink_unicast+0xd9/0x180 > [<ffffffff819a9600>] netlink_sendmsg+0x700/0x770 > [<ffffffff81103735>] ? local_clock+0x25/0x30 > [<ffffffff8194e83c>] sock_sendmsg+0x6c/0x90 > [<ffffffff811f98e3>] ? might_fault+0xa3/0xb0 > [<ffffffff8195ca6d>] ? verify_iovec+0x7d/0xf0 > [<ffffffff8194ec3e>] ___sys_sendmsg+0x37e/0x3b0 > [<ffffffff8111ef15>] ? trace_hardirqs_on_caller+0x185/0x220 > [<ffffffff81af979e>] ? mutex_unlock+0xe/0x10 > [<ffffffff819a55ec>] ? netlink_insert+0xbc/0xe0 > [<ffffffff819a65e5>] ? netlink_autobind.isra.30+0x125/0x150 > [<ffffffff819a6520>] ? netlink_autobind.isra.30+0x60/0x150 > [<ffffffff819a84f9>] ? netlink_bind+0x159/0x230 > [<ffffffff811f989a>] ? might_fault+0x5a/0xb0 > [<ffffffff8194f25e>] ? SYSC_bind+0x7e/0xd0 > [<ffffffff8194f8cd>] __sys_sendmsg+0x4d/0x80 > [<ffffffff8194f912>] SyS_sendmsg+0x12/0x20 > [<ffffffff81afc692>] system_call_fastpath+0x16/0x1b Fixing this by replacing the mode GFP_KERNEL with GFP_ATOMIC. Signed-off-by: Benjamin Block <bebl@mageta.org> Acked-by: David Rientjes <rientjes@google.com> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>		2014-08-22 10:54:49 -07:00
..
netfilter	inet: frags: use kmem_cache for inet_frag_queue	2014-08-02 15:31:31 -07:00
Kconfig	…
Makefile	…
addrconf.c	ipv6: fail early when creating netdev named all or default	2014-07-29 11:43:50 -07:00
addrconf_core.c	…
addrlabel.c	list: fix order of arguments for hlist_add_after(_rcu)	2014-08-06 18:01:24 -07:00
af_inet6.c	ipv6: Implement automatic flow label generation on transmit	2014-07-07 21:14:21 -07:00
ah6.c	…
anycast.c	…
datagram.c	net: Save TX flow hash in sock and set in skbuf on xmit	2014-07-07 21:14:21 -07:00
esp6.c	…
exthdrs.c	…
exthdrs_core.c	…
exthdrs_offload.c	…
fib6_rules.c	…
icmp.c	net: fix the counter ICMP_MIB_INERRORS/ICMP6_MIB_INERRORS	2014-07-31 22:04:18 -07:00
inet6_connection_sock.c	…
inet6_hashtables.c	…
ip6_checksum.c	…
ip6_fib.c	net: ipv6: fib: don't sleep inside atomic lock	2014-08-22 10:54:49 -07:00
ip6_flowlabel.c	…
ip6_gre.c	net: set name_assign_type in alloc_netdev()	2014-07-15 16:12:48 -07:00
ip6_icmp.c	…
ip6_input.c	…
ip6_offload.c	…
ip6_offload.h	…
ip6_output.c	net-timestamp: add key to disambiguate concurrent datagrams	2014-08-05 16:35:54 -07:00
ip6_tunnel.c	net: set name_assign_type in alloc_netdev()	2014-07-15 16:12:48 -07:00
ip6_vti.c	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next	2014-07-30 20:05:54 -07:00
ip6mr.c	net: set name_assign_type in alloc_netdev()	2014-07-15 16:12:48 -07:00
ipcomp6.c	…
ipv6_sockglue.c	ipv6: remove unnecessary break after return	2014-07-15 16:27:01 -07:00
mcast.c	ipv6: Fix MLD Query message check	2014-06-27 00:21:50 -07:00
mip6.c	…
ndisc.c	neigh: remove exceptional & on function name	2014-07-24 23:23:31 -07:00
netfilter.c	…
output_core.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2014-06-11 16:02:55 -07:00
ping.c	…
proc.c	inet: frag: don't account number of fragment queues	2014-07-27 22:34:36 -07:00
protocol.c	…
raw.c	net: use inet6_iif instead of IP6CB()->iif	2014-07-31 22:37:06 -07:00
reassembly.c	inet: frags: use kmem_cache for inet_frag_queue	2014-08-02 15:31:31 -07:00
route.c	…
sit.c	sit: Fix ipip6_tunnel_lookup device matching criteria	2014-08-14 14:38:54 -07:00
syncookies.c	net: remove inet6_reqsk_alloc	2014-06-27 15:53:35 -07:00
sysctl_net_ipv6.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2014-08-05 18:46:26 -07:00
tcp_ipv6.c	tcp: fix tcp_release_cb() to dispatch via address family for mtu_reduced()	2014-08-14 14:38:54 -07:00
tcpv6_offload.c	net-gre-gro: Fix a bug that breaks the forwarding path	2014-07-16 14:45:26 -07:00
tunnel6.c	…
udp.c	net: use inet6_iif instead of IP6CB()->iif	2014-07-31 22:37:06 -07:00
udp_impl.h	…
udp_offload.c	…
udplite.c	…
xfrm6_input.c	…
xfrm6_mode_beet.c	…
xfrm6_mode_ro.c	…
xfrm6_mode_transport.c	…
xfrm6_mode_tunnel.c	…
xfrm6_output.c	…
xfrm6_policy.c	…
xfrm6_protocol.c	…
xfrm6_state.c	…
xfrm6_tunnel.c	…