netlink: 3 bytes leftover after parsing attributes in process `syz-executor6'. syz-executor3 (4956) used greatest stack depth: 14880 bytes left ====================================================== WARNING: possible circular locking dependency detected 4.15.0-rc9+ #214 Not tainted ------------------------------------------------------ syz-executor3/4978 is trying to acquire lock: (&xt[i].mutex){+.+.}, at: [<000000004085e876>] xt_find_target+0x44/0x1e0 net/netfilter/x_tables.c:229 but task is already holding lock: (sk_lock-AF_INET6){+.+.}, at: [<000000001cb82f76>] lock_sock include/net/sock.h:1463 [inline] (sk_lock-AF_INET6){+.+.}, at: [<000000001cb82f76>] ipv6_setsockopt+0xff/0x150 net/ipv6/ipv6_sockglue.c:927 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sk_lock-AF_INET6){+.+.}: lock_sock_nested+0xc2/0x110 net/core/sock.c:2780 lock_sock include/net/sock.h:1463 [inline] do_ipv6_setsockopt.isra.8+0x3c5/0x39d0 net/ipv6/ipv6_sockglue.c:167 ipv6_setsockopt+0xd7/0x150 net/ipv6/ipv6_sockglue.c:922 udpv6_setsockopt+0x45/0x80 net/ipv6/udp.c:1422 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 entry_SYSCALL_64_fastpath+0x29/0xa0 -> #1 (rtnl_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 unregister_netdevice_notifier+0x91/0x4e0 net/core/dev.c:1673 clusterip_config_entry_put net/ipv4/netfilter/ipt_CLUSTERIP.c:114 [inline] clusterip_tg_destroy+0x389/0x6e0 net/ipv4/netfilter/ipt_CLUSTERIP.c:508 cleanup_entry+0x218/0x350 net/ipv4/netfilter/ip_tables.c:659 __do_replace+0x79d/0xa50 net/ipv4/netfilter/ip_tables.c:1094 do_replace net/ipv4/netfilter/ip_tables.c:1150 [inline] do_ipt_set_ctl+0x40f/0x5f0 net/ipv4/netfilter/ip_tables.c:1680 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ip_setsockopt+0xa1/0xb0 net/ipv4/ip_sockglue.c:1260 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2896 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 entry_SYSCALL_64_fastpath+0x29/0xa0 -> #0 (&xt[i].mutex){+.+.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3914 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 xt_find_target+0x44/0x1e0 net/netfilter/x_tables.c:229 xt_request_find_target+0x2c/0xb0 net/netfilter/x_tables.c:255 find_check_entry.isra.7+0x669/0xcf0 net/ipv6/netfilter/ip6_tables.c:572 translate_table+0xf52/0x1690 net/ipv6/netfilter/ip6_tables.c:749 do_replace net/ipv6/netfilter/ip6_tables.c:1165 [inline] do_ip6t_set_ctl+0x370/0x5f0 net/ipv6/netfilter/ip6_tables.c:1691 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0x115/0x150 net/ipv6/ipv6_sockglue.c:928 sctp_setsockopt+0x2b6/0x61d0 net/sctp/socket.c:4141 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 entry_SYSCALL_64_fastpath+0x29/0xa0 other info that might help us debug this: Chain exists of: &xt[i].mutex --> rtnl_mutex --> sk_lock-AF_INET6 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sk_lock-AF_INET6); lock(rtnl_mutex); lock(sk_lock-AF_INET6); lock(&xt[i].mutex); *** DEADLOCK *** 1 lock held by syz-executor3/4978: #0: (sk_lock-AF_INET6){+.+.}, at: [<000000001cb82f76>] lock_sock include/net/sock.h:1463 [inline] #0: (sk_lock-AF_INET6){+.+.}, at: [<000000001cb82f76>] ipv6_setsockopt+0xff/0x150 net/ipv6/ipv6_sockglue.c:927 stack backtrace: CPU: 1 PID: 4978 Comm: syz-executor3 Not tainted 4.15.0-rc9+ #214 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 print_circular_bug.isra.37+0x2cd/0x2dc kernel/locking/lockdep.c:1218 check_prev_add kernel/locking/lockdep.c:1858 [inline] check_prevs_add kernel/locking/lockdep.c:1971 [inline] validate_chain kernel/locking/lockdep.c:2412 [inline] __lock_acquire+0x30a8/0x3e00 kernel/locking/lockdep.c:3426 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3914 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 xt_find_target+0x44/0x1e0 net/netfilter/x_tables.c:229 xt_request_find_target+0x2c/0xb0 net/netfilter/x_tables.c:255 find_check_entry.isra.7+0x669/0xcf0 net/ipv6/netfilter/ip6_tables.c:572 translate_table+0xf52/0x1690 net/ipv6/netfilter/ip6_tables.c:749 do_replace net/ipv6/netfilter/ip6_tables.c:1165 [inline] do_ip6t_set_ctl+0x370/0x5f0 net/ipv6/netfilter/ip6_tables.c:1691 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0x115/0x150 net/ipv6/ipv6_sockglue.c:928 sctp_setsockopt+0x2b6/0x61d0 net/sctp/socket.c:4141 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x453299 RSP: 002b:00007f685a1bbc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000046 RCX: 0000000000453299 RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000013 RBP: 00000000207a1000 R08: 0000000000000428 R09: 0000000000000000 R10: 0000000020011000 R11: 0000000000000212 R12: 00000000006f8178 R13: 00000000ffffffff R14: 00007f685a1bc6d4 R15: 0000000000000000 TCP: request_sock_TCP: Possible SYN flooding on port 20029. Sending cookies. Check SNMP counters. netlink: 16 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 'syz-executor7': attribute type 9 has an invalid length. netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'. xt_cluster: you have exceeded the maximum number of cluster nodes (64 > 32) netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'. xt_cluster: you have exceeded the maximum number of cluster nodes (64 > 32) netlink: 'syz-executor7': attribute type 9 has an invalid length. mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium netlink: 'syz-executor5': attribute type 21 has an invalid length. netlink: 'syz-executor1': attribute type 1 has an invalid length. audit: type=1400 audit(1517215707.389:18): avc: denied { ioctl } for pid=4897 comm="syz-executor6" path="socket:[13046]" dev="sockfs" ino=13046 ioctlcmd=0x8918 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1 netlink: 16 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 'syz-executor1': attribute type 1 has an invalid length. audit: type=1400 audit(1517215707.683:19): avc: denied { create } for pid=5020 comm="syz-executor3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(1517215707.690:20): avc: denied { getopt } for pid=5020 comm="syz-executor3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(1517215707.691:21): avc: denied { write } for pid=5020 comm="syz-executor3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 netlink: 4 bytes leftover after parsing attributes in process `syz-executor3'. sctp: [Deprecated]: syz-executor7 (pid 5594) Use of int in maxseg socket option. Use struct sctp_assoc_value instead netlink: 'syz-executor2': attribute type 6 has an invalid length. netlink: 'syz-executor2': attribute type 6 has an invalid length. l2tp_core: tunl 59: sockfd_lookup(fd=0) returned -88 netlink: 8 bytes leftover after parsing attributes in process `syz-executor7'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=60525 sclass=netlink_route_socket pig=5728 comm=syz-executor2 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium ip6gretap0: FDB only supports static addresses SELinux: unrecognized netlink message: protocol=0 nlmsg_type=60525 sclass=netlink_route_socket pig=5737 comm=syz-executor2 ip6gretap0: FDB only supports static addresses Protocol error: SET target dimension is over the limit! Protocol error: SET target dimension is over the limit! x_tables: ip_tables: osf match: only valid for protocol 6 x_tables: ip_tables: osf match: only valid for protocol 6 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=8927 sclass=netlink_xfrm_socket pig=5827 comm=syz-executor4 xt_CT: netfilter: NOTRACK target is deprecated, use CT instead or upgrade iptables SELinux: unrecognized netlink message: protocol=6 nlmsg_type=8927 sclass=netlink_xfrm_socket pig=5827 comm=syz-executor4 xt_CT: No such timeout policy "syz1" xt_CT: No such timeout policy "syz1" mip6: mip6_destopt_init_state: spi is not 0: 3708026880 mip6: mip6_destopt_init_state: spi is not 0: 3708026880 ip6t_REJECT: TCP_RESET illegal for non-tcp ip6t_REJECT: TCP_RESET illegal for non-tcp netlink: 'syz-executor5': attribute type 21 has an invalid length. TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. syz-executor2 (6131) used greatest stack depth: 14688 bytes left TCP: request_sock_TCPv6: Possible SYN flooding on port 20010. Sending cookies. Check SNMP counters. device syz2 entered promiscuous mode device syz2 left promiscuous mode device syz3 entered promiscuous mode IPv4: Oversized IP packet from 127.0.0.1 IPv4: Oversized IP packet from 127.0.0.1 kauditd_printk_skb: 14 callbacks suppressed audit: type=1400 audit(1517215712.297:36): avc: denied { read } for pid=6746 comm="syz-executor1" path="socket:[16042]" dev="sockfs" ino=16042 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 netlink: 'syz-executor1': attribute type 17 has an invalid length. netlink: 'syz-executor6': attribute type 16 has an invalid length. dccp_xmit_packet: Payload too large (65423) for featneg. dccp_close: ABORT with 65423 bytes unread audit: type=1400 audit(1517215712.619:37): avc: denied { accept } for pid=6874 comm="syz-executor0" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1 nla_parse: 3 callbacks suppressed netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'. audit: type=1400 audit(1517215712.838:38): avc: denied { setopt } for pid=6958 comm="syz-executor2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1 validate_nla: 1 callbacks suppressed netlink: 'syz-executor1': attribute type 3 has an invalid length. audit: type=1400 audit(1517215712.948:39): avc: denied { relabelto } for pid=7005 comm="syz-executor5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:policy_src_t:s0 tclass=packet permissive=1 TCP: request_sock_TCPv6: Possible SYN flooding on port 20026. Sending cookies. Check SNMP counters. netlink: 'syz-executor1': attribute type 3 has an invalid length. netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'. audit: type=1400 audit(1517215713.032:40): avc: denied { connect } for pid=7027 comm="syz-executor6" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1 netlink: 11 bytes leftover after parsing attributes in process `syz-executor3'. l2tp_core: tunl 1: fd 19 wrong protocol, got 1, expected 17 l2tp_core: tunl 1: fd 20 wrong protocol, got 1, expected 17 netlink: 11 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor2'. can: request_module (can-proto-0) failed. can: request_module (can-proto-0) failed. syz-executor6 (7573) used greatest stack depth: 13616 bytes left sctp: [Deprecated]: syz-executor3 (pid 7616) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor3 (pid 7616) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor3 (pid 7616) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor0 (pid 7636) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor0 (pid 7636) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead netlink: 'syz-executor5': attribute type 6 has an invalid length. netlink: 'syz-executor5': attribute type 6 has an invalid length. audit: type=1400 audit(1517215715.067:41): avc: denied { listen } for pid=7813 comm="syz-executor7" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1 audit: type=1400 audit(1517215715.097:42): avc: denied { read } for pid=7813 comm="syz-executor7" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1 netlink: 'syz-executor2': attribute type 29 has an invalid length. netlink: 5 bytes leftover after parsing attributes in process `syz-executor2'. audit: type=1400 audit(1517215715.396:43): avc: denied { create } for pid=7918 comm="syz-executor6" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_iscsi_socket permissive=1 netlink: 'syz-executor7': attribute type 1 has an invalid length. netlink: 'syz-executor2': attribute type 29 has an invalid length. netlink: 5 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 'syz-executor7': attribute type 1 has an invalid length. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=20515 sclass=netlink_route_socket pig=8014 comm=syz-executor0 RDS: rds_bind could not find a transport for 224.0.0.1, load rds_tcp or rds_rdma? RDS: rds_bind could not find a transport for 224.0.0.1, load rds_tcp or rds_rdma? audit: type=1400 audit(1517215716.021:44): avc: denied { ioctl } for pid=8128 comm="syz-executor7" path="socket:[17355]" dev="sockfs" ino=17355 ioctlcmd=0x8918 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_crypto_socket permissive=1 netlink: 8 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor4'. mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium audit: type=1400 audit(1517215716.483:45): avc: denied { bind } for pid=8307 comm="syz-executor2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1 netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'. sock: sock_set_timeout: `syz-executor3' (pid 8414) tries to set negative timeout sock: sock_set_timeout: `syz-executor3' (pid 8414) tries to set negative timeout netlink: 'syz-executor6': attribute type 21 has an invalid length. netlink: 'syz-executor6': attribute type 21 has an invalid length. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=11 sclass=netlink_route_socket pig=8614 comm=syz-executor0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=11 sclass=netlink_route_socket pig=8623 comm=syz-executor0 device lo entered promiscuous mode TCP: request_sock_TCPv6: Possible SYN flooding on port 20026. Sending cookies. Check SNMP counters.