linux/net/ipv6/netfilter
Florian Westphal d93c6258ee netfilter: conntrack: resched in nf_ct_iterate_cleanup
Ulrich reports soft lockup with following (shortened) callchain:

NMI watchdog: BUG: soft lockup - CPU#1 stuck for 22s!
__netif_receive_skb_core+0x6e4/0x774
process_backlog+0x94/0x160
net_rx_action+0x88/0x178
call_do_softirq+0x24/0x3c
do_softirq+0x54/0x6c
__local_bh_enable_ip+0x7c/0xbc
nf_ct_iterate_cleanup+0x11c/0x22c [nf_conntrack]
masq_inet_event+0x20/0x30 [nf_nat_masquerade_ipv6]
atomic_notifier_call_chain+0x1c/0x2c
ipv6_del_addr+0x1bc/0x220 [ipv6]

Problem is that nf_ct_iterate_cleanup can run for a very long time
since it can be interrupted by softirq processing.
Moreover, atomic_notifier_call_chain runs with rcu readlock held.

So lets call cond_resched() in nf_ct_iterate_cleanup and defer
the call to a work queue for the atomic_notifier_call_chain case.

We also need another cond_resched in get_next_corpse, since we
have to deal with iter() always returning false, in that case
get_next_corpse will walk entire conntrack table.

Reported-by: Ulrich Weber <uw@ocedo.com>
Tested-by: Ulrich Weber <uw@ocedo.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2016-02-01 00:15:26 +01:00
..
Kconfig netfilter: nf_dup: add missing dependencies with NF_CONNTRACK 2015-12-10 18:17:06 +01:00
Makefile netfilter: nf_tables: add nft_dup expression 2015-08-07 11:49:49 +02:00
ip6_tables.c netfilter: ip6_tables: improve if statements 2015-10-14 12:29:51 +02:00
ip6t_MASQUERADE.c netfilter: nf_nat: generalize IPv6 masquerading support for nf_tables 2014-09-09 16:31:29 +02:00
ip6t_NPT.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-04-07 18:37:01 -04:00
ip6t_REJECT.c netfilter: x_tables: Use par->net instead of computing from the passed net devices 2015-09-18 21:58:25 +02:00
ip6t_SYNPROXY.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2015-10-17 14:28:03 +02:00
ip6t_ah.c netfilter: ip6_tables: add flags parameter to ipv6_find_hdr() 2012-05-09 12:53:47 +02:00
ip6t_eui64.c netfilter: xtables: change hotdrop pointer to direct modification 2010-05-11 18:35:27 +02:00
ip6t_frag.c netfilter: ip6_tables: add flags parameter to ipv6_find_hdr() 2012-05-09 12:53:47 +02:00
ip6t_hbh.c netfilter: ip6_tables: add flags parameter to ipv6_find_hdr() 2012-05-09 12:53:47 +02:00
ip6t_ipv6header.c netfilter: remove unnecessary break after return 2014-07-15 16:27:00 -07:00
ip6t_mh.c netfilter: xtables: change hotdrop pointer to direct modification 2010-05-11 18:35:27 +02:00
ip6t_rpfilter.c netfilter: x_tables: Use par->net instead of computing from the passed net devices 2015-09-18 21:58:25 +02:00
ip6t_rt.c netfilter: ip6_tables: add flags parameter to ipv6_find_hdr() 2012-05-09 12:53:47 +02:00
ip6table_filter.c netfilter: Pass priv instead of nf_hook_ops to netfilter hooks 2015-09-18 22:00:16 +02:00
ip6table_mangle.c ipv6: Pass struct net into ip6_route_me_harder 2015-09-29 20:21:32 +02:00
ip6table_nat.c netfilter: remove hook owner refcounting 2015-10-16 18:21:39 +02:00
ip6table_raw.c netfilter: Pass priv instead of nf_hook_ops to netfilter hooks 2015-09-18 22:00:16 +02:00
ip6table_security.c netfilter: Pass priv instead of nf_hook_ops to netfilter hooks 2015-09-18 22:00:16 +02:00
nf_conntrack_l3proto_ipv6.c netfilter: remove hook owner refcounting 2015-10-16 18:21:39 +02:00
nf_conntrack_proto_icmpv6.c netfilter: ipv6: whitespace around operators 2015-10-13 14:12:38 +02:00
nf_conntrack_reasm.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2015-12-14 20:31:16 +01:00
nf_defrag_ipv6_hooks.c netfilter: ipv6: avoid nf_iterate recursion 2015-11-23 17:54:45 +01:00
nf_dup_ipv6.c ipv4, ipv6: Pass net into ip_local_out and ip6_local_out 2015-10-08 04:27:02 -07:00
nf_log_ipv6.c netfilter: Use LOGLEVEL_<FOO> defines 2015-03-25 12:09:39 +01:00
nf_nat_l3proto_ipv6.c net: Eliminate NETIF_F_GEN_CSUM and NETIF_F_V[46]_CSUM 2015-12-15 16:50:20 -05:00
nf_nat_masquerade_ipv6.c netfilter: conntrack: resched in nf_ct_iterate_cleanup 2016-02-01 00:15:26 +01:00
nf_nat_proto_icmpv6.c net: Change pseudohdr argument of inet_proto_csum_replace* to be a bool 2015-08-17 21:33:06 -07:00
nf_reject_ipv6.c netfilter: remove duplicate include 2015-11-23 17:54:43 +01:00
nf_tables_ipv6.c netfilter: nf_tables: release objects on netns destruction 2015-12-28 18:34:35 +01:00
nft_chain_nat_ipv6.c netfilter: Pass priv instead of nf_hook_ops to netfilter hooks 2015-09-18 22:00:16 +02:00
nft_chain_route_ipv6.c netfilter: ipv6: code indentation 2015-10-13 14:12:38 +02:00
nft_dup_ipv6.c netfilter: Pass net to nf_dup_ipv4 and nf_dup_ipv6 2015-09-18 21:59:11 +02:00
nft_masq_ipv6.c netfilter: nf_tables: get rid of NFT_REG_VERDICT usage 2015-04-13 17:17:07 +02:00
nft_redir_ipv6.c netfilter: nf_tables: kill nft_pktinfo.ops 2015-09-18 21:58:01 +02:00
nft_reject_ipv6.c netfilter: nf_tables: Use pkt->net instead of computing net from the passed net_devices 2015-09-18 21:58:49 +02:00