====================================================== WARNING: possible circular locking dependency detected 4.15.0+ #221 Not tainted ------------------------------------------------------ syz-executor0/5868 is trying to acquire lock: (sk_lock-AF_INET){+.+.}, at: [<000000007bde33c4>] lock_sock include/net/sock.h:1463 [inline] (sk_lock-AF_INET){+.+.}, at: [<000000007bde33c4>] do_ip_setsockopt.isra.12+0x1d9/0x3210 net/ipv4/ip_sockglue.c:646 but task is already holding lock: (rtnl_mutex){+.+.}, at: [<00000000a61afea7>] 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 udp_setsockopt+0x45/0x80 net/ipv4/udp.c:2401 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-executor0/5868: #0: (rtnl_mutex){+.+.}, at: [<00000000a61afea7>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 stack backtrace: CPU: 1 PID: 5868 Comm: syz-executor0 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 udp_setsockopt+0x45/0x80 net/ipv4/udp.c:2401 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:00007fa704ed0c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299 RDX: 0000000000000027 RSI: 0000000000000000 RDI: 0000000000000013 RBP: 00000000000005d6 R08: 000000000000000c R09: 0000000000000000 R10: 000000002001b000 R11: 0000000000000212 R12: 00000000006f7cb0 R13: 00000000ffffffff R14: 00007fa704ed16d4 R15: 0000000000000000 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=260 sclass=netlink_route_socket pig=5881 comm=syz-executor2 netlink: 'syz-executor6': attribute type 3 has an invalid length. device syz4 entered promiscuous mode SELinux: unrecognized netlink message: protocol=0 nlmsg_type=260 sclass=netlink_route_socket pig=5920 comm=syz-executor2 netlink: 'syz-executor6': attribute type 3 has an invalid length. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=260 sclass=netlink_route_socket pig=5938 comm=syz-executor2 netlink: 'syz-executor6': attribute type 3 has an invalid length. netlink: 'syz-executor6': attribute type 3 has an invalid length. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=260 sclass=netlink_route_socket pig=5973 comm=syz-executor2 netlink: 'syz-executor2': attribute type 16 has an invalid length. xt_ipcomp: unknown flags FE xt_ipcomp: unknown flags FE netlink: 4096 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 4096 bytes leftover after parsing attributes in process `syz-executor3'. xt_ipcomp: unknown flags FE netlink: 4096 bytes leftover after parsing attributes in process `syz-executor3'. xt_ipcomp: unknown flags FE netlink: 4096 bytes leftover after parsing attributes in process `syz-executor3'. xt_ipcomp: unknown flags FE netlink: 4096 bytes leftover after parsing attributes in process `syz-executor3'. validate_nla: 4 callbacks suppressed netlink: 'syz-executor0': attribute type 15 has an invalid length. netlink: 'syz-executor0': attribute type 15 has an invalid length. netlink: 188 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 188 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 188 bytes leftover after parsing attributes in process `syz-executor5'. IPv4: Oversized IP packet from 127.0.0.1 netlink: 188 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 188 bytes leftover after parsing attributes in process `syz-executor5'. Protocol error: SET target dimension is over the limit! Protocol error: SET target dimension is over the limit! netlink: 'syz-executor0': attribute type 1 has an invalid length. netlink: 'syz-executor0': attribute type 1 has an invalid length. RDS: rds_bind could not find a transport for 255.255.255.255, load rds_tcp or rds_rdma? RDS: rds_bind could not find a transport for 255.255.255.255, load rds_tcp or rds_rdma? device lo entered promiscuous mode IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready device lo entered promiscuous mode IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready sctp: [Deprecated]: syz-executor0 (pid 8246) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor0 (pid 8253) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor0 (pid 8269) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor6 (pid 8293) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor2 (pid 8291) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor0 (pid 8294) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor0 (pid 8333) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor2 (pid 8335) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor6 (pid 8336) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor2 (pid 8359) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead kauditd_printk_skb: 7 callbacks suppressed audit: type=1400 audit(1517925457.493:29): avc: denied { setopt } for pid=8543 comm="syz-executor7" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:unlabeled_t:s0 tclass=socket permissive=1 syz-executor1 uses obsolete (PF_INET,SOCK_PACKET) device syz1 entered promiscuous mode device syz1 left promiscuous mode device syz1 entered promiscuous mode TCP: request_sock_TCPv6: Possible SYN flooding on port 20014. Sending cookies. Check SNMP counters. TCP: request_sock_TCPv6: Possible SYN flooding on port 20006. Sending cookies. Check SNMP counters. TCP: request_sock_TCPv6: Possible SYN flooding on port 20014. Sending cookies. Check SNMP counters. TCP: request_sock_TCPv6: Possible SYN flooding on port 20014. Sending cookies. Check SNMP counters. TCP: request_sock_TCPv6: Possible SYN flooding on port 20006. Sending cookies. Check SNMP counters. TCP: request_sock_TCPv6: Possible SYN flooding on port 20018. Sending cookies. Check SNMP counters. TCP: request_sock_TCPv6: Possible SYN flooding on port 20018. Sending cookies. Check SNMP counters. TCP: request_sock_TCPv6: Possible SYN flooding on port 20006. Sending cookies. Check SNMP counters. TCP: request_sock_TCPv6: Possible SYN flooding on port 20014. Sending cookies. Check SNMP counters. dccp_close: ABORT with 1 bytes unread TCP: request_sock_TCPv6: Possible SYN flooding on port 20018. Sending cookies. Check SNMP counters. dccp_close: ABORT with 1 bytes unread dccp_close: ABORT with 1 bytes unread dccp_close: ABORT with 1 bytes unread dccp_close: ABORT with 1 bytes unread dccp_close: ABORT with 1 bytes unread dccp_close: ABORT with 1 bytes unread dccp_close: ABORT with 1 bytes unread dccp_close: ABORT with 1 bytes unread dccp_close: ABORT with 1 bytes unread dccp_close: ABORT with 1 bytes unread dccp_close: ABORT with 1 bytes unread dccp_close: ABORT with 1 bytes unread ip6t_REJECT: TCP_RESET illegal for non-tcp ip6t_REJECT: TCP_RESET illegal for non-tcp ip6t_REJECT: TCP_RESET illegal for non-tcp ip6t_REJECT: TCP_RESET illegal for non-tcp ip6t_REJECT: TCP_RESET illegal for non-tcp