TCP: request_sock_TCP: Possible SYN flooding on port 20018. Sending cookies. Check SNMP counters. ====================================================== WARNING: possible circular locking dependency detected 4.15.0+ #221 Not tainted ------------------------------------------------------ syz-executor3/5836 is trying to acquire lock: (sk_lock-AF_INET){+.+.}, at: [<0000000068b304ec>] lock_sock include/net/sock.h:1463 [inline] (sk_lock-AF_INET){+.+.}, at: [<0000000068b304ec>] do_ip_setsockopt.isra.12+0x1d9/0x3210 net/ipv4/ip_sockglue.c:646 but task is already holding lock: (rtnl_mutex){+.+.}, at: [<000000009ad793f9>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (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:518 cleanup_entry+0x218/0x350 net/ipv4/netfilter/ip_tables.c:654 __do_replace+0x79d/0xa50 net/ipv4/netfilter/ip_tables.c:1089 do_replace net/ipv4/netfilter/ip_tables.c:1145 [inline] do_ipt_set_ctl+0x40f/0x5f0 net/ipv4/netfilter/ip_tables.c:1675 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ip_setsockopt+0x97/0xa0 net/ipv4/ip_sockglue.c:1259 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2975 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 entry_SYSCALL_64_fastpath+0x29/0xa0 -> #1 (&xt[i].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 xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1041 xt_request_find_table_lock+0x28/0xc0 net/netfilter/x_tables.c:1088 get_info+0x154/0x690 net/ipv6/netfilter/ip6_tables.c:989 do_ipt_get_ctl+0x159/0xac0 net/ipv4/netfilter/ip_tables.c:1699 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] nf_getsockopt+0x6a/0xc0 net/netfilter/nf_sockopt.c:122 ip_getsockopt+0x15c/0x220 net/ipv4/ip_sockglue.c:1571 tcp_getsockopt+0x82/0xd0 net/ipv4/tcp.c:3359 sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2934 SYSC_getsockopt net/socket.c:1880 [inline] SyS_getsockopt+0x178/0x340 net/socket.c:1862 entry_SYSCALL_64_fastpath+0x29/0xa0 -> #0 (sk_lock-AF_INET){+.+.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 lock_sock_nested+0xc2/0x110 net/core/sock.c:2777 lock_sock include/net/sock.h:1463 [inline] do_ip_setsockopt.isra.12+0x1d9/0x3210 net/ipv4/ip_sockglue.c:646 ip_setsockopt+0x3a/0xa0 net/ipv4/ip_sockglue.c:1252 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2975 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: sk_lock-AF_INET --> &xt[i].mutex --> rtnl_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(rtnl_mutex); lock(&xt[i].mutex); lock(rtnl_mutex); lock(sk_lock-AF_INET); *** DEADLOCK *** 1 lock held by syz-executor3/5836: #0: (rtnl_mutex){+.+.}, at: [<000000009ad793f9>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 stack backtrace: CPU: 0 PID: 5836 Comm: syz-executor3 Not tainted 4.15.0+ #221 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.38+0x2cd/0x2dc kernel/locking/lockdep.c:1223 check_prev_add kernel/locking/lockdep.c:1863 [inline] check_prevs_add kernel/locking/lockdep.c:1976 [inline] validate_chain kernel/locking/lockdep.c:2417 [inline] __lock_acquire+0x30a8/0x3e00 kernel/locking/lockdep.c:3431 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 lock_sock_nested+0xc2/0x110 net/core/sock.c:2777 lock_sock include/net/sock.h:1463 [inline] do_ip_setsockopt.isra.12+0x1d9/0x3210 net/ipv4/ip_sockglue.c:646 ip_setsockopt+0x3a/0xa0 net/ipv4/ip_sockglue.c:1252 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2975 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:00007fd64d8d4c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299 RDX: 0000000000000027 RSI: 0000000000000000 RDI: 0000000000000013 RBP: 00000000000005d5 R08: 000000000000000c R09: 0000000000000000 R10: 0000000020de2ff4 R11: 0000000000000212 R12: 00000000006f7c98 R13: 00000000ffffffff R14: 00007fd64d8d56d4 R15: 0000000000000000 netlink: 'syz-executor0': attribute type 3 has an invalid length. netlink: 'syz-executor7': attribute type 4 has an invalid length. netlink: 'syz-executor7': attribute type 4 has an invalid length. netlink: 'syz-executor0': attribute type 3 has an invalid length. netlink: 'syz-executor4': attribute type 3 has an invalid length. sctp: [Deprecated]: syz-executor7 (pid 6274) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor7 (pid 6285) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead dccp_invalid_packet: P.Data Offset(0) too small netlink: 16 bytes leftover after parsing attributes in process `syz-executor6'. RDS: rds_bind could not find a transport for 255.255.255.255, load rds_tcp or rds_rdma? dccp_invalid_packet: P.Data Offset(0) too small sctp: [Deprecated]: syz-executor4 (pid 6328) Use of int in maxseg socket option. Use struct sctp_assoc_value instead netlink: 16 bytes leftover after parsing attributes in process `syz-executor6'. RDS: rds_bind could not find a transport for 255.255.255.255, load rds_tcp or rds_rdma? sctp: [Deprecated]: syz-executor4 (pid 6328) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor3 (pid 6431) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor3 (pid 6439) Use of int in maxseg socket option. Use struct sctp_assoc_value instead kauditd_printk_skb: 26 callbacks suppressed audit: type=1400 audit(1517897232.238:48): avc: denied { getopt } for pid=6470 comm="syz-executor1" 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 xt_recent: Unsupported user space flags (00000071) xt_recent: Unsupported user space flags (00000071) netlink: 'syz-executor6': attribute type 2 has an invalid length. SNAT: multiple ranges no longer supported SNAT: multiple ranges no longer supported audit: type=1400 audit(1517897232.825:49): avc: denied { getattr } for pid=6739 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 insert transport fail, errno -17 sctp: [Deprecated]: syz-executor0 (pid 6806) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead device lo entered promiscuous mode audit: type=1400 audit(1517897233.287:50): avc: denied { map } for pid=6924 comm="syz-executor0" path="socket:[16764]" dev="sockfs" ino=16764 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=socket permissive=1 device bridge0 entered promiscuous mode device bridge0 left promiscuous mode device syz4 entered promiscuous mode Cannot find add_set index 0 as target device syz4 left promiscuous mode device syz4 entered promiscuous mode ip_tunnel: non-ECT from 0.0.0.0 with TOS=0x3 IPv6: NLM_F_CREATE should be specified when creating new route Cannot find add_set index 0 as target ip_tunnel: non-ECT from 0.0.0.0 with TOS=0x3 netlink: 'syz-executor2': attribute type 1 has an invalid length. netlink: 'syz-executor2': attribute type 1 has an invalid length. netlink: 3 bytes leftover after parsing attributes in process `syz-executor7'. audit: type=1400 audit(1517897234.208:51): avc: denied { getopt } for pid=7248 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: 3 bytes leftover after parsing attributes in process `syz-executor7'. TCP: request_sock_TCP: Possible SYN flooding on port 20001. Sending cookies. Check SNMP counters. audit: type=1400 audit(1517897234.689:52): avc: denied { create } for pid=7461 comm="syz-executor4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_rdma_socket permissive=1 Cannot find add_set index 0 as target Cannot find add_set index 0 as target netlink: 'syz-executor4': attribute type 4 has an invalid length. syz4: Invalid MTU 18 requested, hw min 68 netlink: 'syz-executor4': attribute type 4 has an invalid length. syz4: Invalid MTU 18 requested, hw min 68 syz-executor1 (7649) used greatest stack depth: 12720 bytes left audit: type=1400 audit(1517897235.183:53): avc: denied { map } for pid=7659 comm="syz-executor5" path="pipe:[17912]" dev="pipefs" ino=17912 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=fifo_file permissive=1 netlink: 'syz-executor1': attribute type 33 has an invalid length. A link change request failed with some changes committed already. Interface syz1 may have been left with an inconsistent configuration, please check. audit: type=1400 audit(1517897235.512:54): avc: denied { net_broadcast } for pid=7782 comm="syz-executor6" capability=11 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 netlink: 'syz-executor6': attribute type 20 has an invalid length. netlink: 'syz-executor1': attribute type 33 has an invalid length. A link change request failed with some changes committed already. Interface syz1 may have been left with an inconsistent configuration, please check. netlink: 'syz-executor6': attribute type 20 has an invalid length. dccp_close: ABORT with 65423 bytes unread audit: type=1400 audit(1517897236.007:55): avc: denied { accept } for pid=7964 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_crypto_socket permissive=1 IPv6: RTM_NEWROUTE with no NLM_F_CREATE or NLM_F_REPLACE IPv6: NLM_F_CREATE should be set when creating new route IPv6: NLM_F_CREATE should be set when creating new route IPv6: NLM_F_CREATE should be set when creating new route IPv6: RTM_NEWROUTE with no NLM_F_CREATE or NLM_F_REPLACE netlink: 8 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor5'. bridge0: port 1(syz3) entered blocking state bridge0: port 1(syz3) entered disabled state device syz3 entered promiscuous mode bridge0: port 1(syz3) entered blocking state bridge0: port 1(syz3) entered forwarding state IPv6: ADDRCONF(NETDEV_CHANGE): bridge0: link becomes ready netlink: 'syz-executor4': attribute type 1 has an invalid length. netlink: 'syz-executor4': attribute type 1 has an invalid length. TCP: request_sock_TCP: Possible SYN flooding on port 20021. Sending cookies. Check SNMP counters. Cannot find set identified by id 0 to match audit: type=1400 audit(1517897237.562:56): avc: denied { getopt } for pid=8562 comm="syz-executor6" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:unlabeled_t:s0 tclass=socket permissive=1 device syz7 entered promiscuous mode device syz7 left promiscuous mode sit: non-ECT from 0.0.0.0 with TOS=0x7 sit: non-ECT from 0.0.0.0 with TOS=0x7 mip6: mip6_destopt_init_state: spi is not 0: 3875799040 ipt_CLUSTERIP: bad local_nodes[0] 0 rdma_op 00000000e339fe42 conn xmit_rdma (null) ipt_CLUSTERIP: bad local_nodes[0] 0 netlink: 27 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 27 bytes leftover after parsing attributes in process `syz-executor3'. validate_nla: 7 callbacks suppressed netlink: 'syz-executor3': attribute type 21 has an invalid length. audit: type=1400 audit(1517897239.134:57): avc: denied { map } for pid=9180 comm="syz-executor4" path="socket:[20645]" dev="sockfs" ino=20645 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=rawip_socket permissive=1 xt_CT: netfilter: NOTRACK target is deprecated, use CT instead or upgrade iptables audit: type=1400 audit(1517897239.379:58): avc: denied { map } for pid=9279 comm="syz-executor0" path="socket:[20147]" dev="sockfs" ino=20147 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=packet_socket permissive=1 xt_CT: You must specify a L4 protocol, and not use inversions on it. xt_CT: You must specify a L4 protocol, and not use inversions on it. ipt_CLUSTERIP: no config found for 172.20.0.170, need 'new' ipt_CLUSTERIP: no config found for 172.20.0.170, need 'new' audit: type=1400 audit(1517897239.637:59): avc: denied { read } for pid=9353 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_fib_lookup_socket permissive=1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=260 sclass=netlink_route_socket pig=9487 comm=syz-executor1