====================================================== WARNING: possible circular locking dependency detected 4.15.0+ #221 Not tainted xt_TCPMSS: Only works on TCP SYN packets ------------------------------------------------------ syz-executor5/5807 is trying to acquire lock: (sk_lock-AF_INET){+.+.}, at: [<0000000046bbd7df>] lock_sock include/net/sock.h:1463 [inline] (sk_lock-AF_INET){+.+.}, at: [<0000000046bbd7df>] do_ip_setsockopt.isra.12+0x1d9/0x3210 net/ipv4/ip_sockglue.c:646 but task is already holding lock: (rtnl_mutex){+.+.}, at: [<00000000366b10e7>] 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 raw_setsockopt+0xb7/0xd0 net/ipv4/raw.c:870 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-executor5/5807: #0: (rtnl_mutex){+.+.}, at: [<00000000366b10e7>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 stack backtrace: CPU: 0 PID: 5807 Comm: syz-executor5 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 raw_setsockopt+0xb7/0xd0 net/ipv4/raw.c:870 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:00007f5666182c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000013 RBP: 00000000000005c9 R08: 0000000000000004 R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000212 R12: 00000000006f7b78 R13: 00000000ffffffff R14: 00007f56661836d4 R15: 0000000000000000 netlink: 'syz-executor2': attribute type 21 has an invalid length. netlink: 'syz-executor2': attribute type 21 has an invalid length. sctp: [Deprecated]: syz-executor7 (pid 5870) Use of int in max_burst socket option. Use struct sctp_assoc_value instead xt_recent: hitcount (2147483649) is larger than allowed maximum (255) sctp: [Deprecated]: syz-executor7 (pid 5870) Use of int in max_burst socket option. Use struct sctp_assoc_value instead xt_recent: hitcount (2147483649) is larger than allowed maximum (255) device ip6_vti0 entered promiscuous mode device ip6_vti0 left promiscuous mode l2tp_core: tunl 59: sockfd_lookup(fd=0) returned -88 l2tp_core: tunl 59: sockfd_lookup(fd=0) returned -88 can: request_module (can-proto-6) failed. can: request_module (can-proto-6) failed. dccp_invalid_packet: P.type (REQUEST) not Data || [Data]Ack, while P.X == 0 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready ipt_CLUSTERIP: Please specify destination IP raw_sendmsg: syz-executor4 forgot to set AF_INET. Fix it! ipt_CLUSTERIP: Please specify destination IP IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready ipt_CLUSTERIP: bad num_local_nodes 65534 ipt_CLUSTERIP: Please specify destination IP netlink: 'syz-executor1': attribute type 21 has an invalid length. netlink: 'syz-executor3': attribute type 3 has an invalid length. netlink: 200 bytes leftover after parsing attributes in process `syz-executor1'. ipt_CLUSTERIP: Please specify destination IP netlink: 'syz-executor3': attribute type 3 has an invalid length. netlink: 'syz-executor1': attribute type 21 has an invalid length. device syz7 entered promiscuous mode netlink: 200 bytes leftover after parsing attributes in process `syz-executor1'. device syz7 left promiscuous mode device syz7 entered promiscuous mode device syz7 left promiscuous mode netlink: 40 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 40 bytes leftover after parsing attributes in process `syz-executor3'. SELinux: unrecognized netlink message: protocol=6 nlmsg_type=47119 sclass=netlink_xfrm_socket pig=6548 comm=syz-executor4 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=47119 sclass=netlink_xfrm_socket pig=6536 comm=syz-executor4 l2tp_core: tunl 1: fd 19 wrong protocol, got 1, expected 17 l2tp_core: tunl 1: fd 22 wrong protocol, got 1, expected 17 IPv4: Oversized IP packet from 127.0.0.1 kauditd_printk_skb: 17 callbacks suppressed audit: type=1400 audit(1517788910.367:39): avc: denied { setopt } for pid=6674 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 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=46 sclass=netlink_tcpdiag_socket pig=6685 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=46 sclass=netlink_tcpdiag_socket pig=6685 comm=syz-executor5 audit: type=1400 audit(1517788910.523:40): avc: denied { ioctl } for pid=6735 comm="syz-executor1" path="socket:[15936]" dev="sockfs" ino=15936 ioctlcmd=0x8902 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 sctp: [Deprecated]: syz-executor4 (pid 6741) Use of int in maxseg socket option. Use struct sctp_assoc_value instead Protocol error: SET target dimension is over the limit! dccp_close: ABORT with 254 bytes unread ipt_REJECT: TCP_RESET invalid for non-tcp ipt_REJECT: TCP_RESET invalid for non-tcp sctp: [Deprecated]: syz-executor4 (pid 6741) Use of int in maxseg socket option. Use struct sctp_assoc_value instead Protocol error: SET target dimension is over the limit! ieee80211 phy2: Selected rate control algorithm 'minstrel_ht' xt_l2tp: missing protocol rule (udp|l2tpip) ieee80211 phy3: Selected rate control algorithm 'minstrel_ht' dccp_v6_rcv: dropped packet with invalid checksum netlink: 'syz-executor3': attribute type 21 has an invalid length. netlink: 'syz-executor3': attribute type 1 has an invalid length. dccp_v6_rcv: dropped packet with invalid checksum netlink: 'syz-executor3': attribute type 21 has an invalid length. netlink: 'syz-executor3': attribute type 1 has an invalid length.