====================================================== WARNING: possible circular locking dependency detected 4.15.0-rc9+ #218 Not tainted ------------------------------------------------------ syz-executor1/5914 is trying to acquire lock: (&xt[i].mutex){+.+.}, at: [<00000000c86f7ab5>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1036 but task is already holding lock: (sk_lock-AF_INET6){+.+.}, at: [<00000000d62f351f>] lock_sock include/net/sock.h:1463 [inline] (sk_lock-AF_INET6){+.+.}, at: [<00000000d62f351f>] ipv6_getsockopt+0x1c5/0x2e0 net/ipv6/ipv6_sockglue.c:1377 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 tee_tg_destroy+0x61/0xc0 net/netfilter/xt_TEE.c:123 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 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 -> #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_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1036 get_entries net/ipv6/netfilter/ip6_tables.c:1050 [inline] do_ip6t_get_ctl+0x432/0xaf0 net/ipv6/netfilter/ip6_tables.c:1719 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] nf_getsockopt+0x6a/0xc0 net/netfilter/nf_sockopt.c:122 ipv6_getsockopt+0x1df/0x2e0 net/ipv6/ipv6_sockglue.c:1378 udpv6_getsockopt+0x45/0x80 net/ipv6/udp.c:1441 sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2937 SYSC_getsockopt net/socket.c:1880 [inline] SyS_getsockopt+0x178/0x340 net/socket.c:1862 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-executor1/5914: #0: (sk_lock-AF_INET6){+.+.}, at: [<00000000d62f351f>] lock_sock include/net/sock.h:1463 [inline] #0: (sk_lock-AF_INET6){+.+.}, at: [<00000000d62f351f>] ipv6_getsockopt+0x1c5/0x2e0 net/ipv6/ipv6_sockglue.c:1377 stack backtrace: CPU: 1 PID: 5914 Comm: syz-executor1 Not tainted 4.15.0-rc9+ #218 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_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1036 get_entries net/ipv6/netfilter/ip6_tables.c:1050 [inline] do_ip6t_get_ctl+0x432/0xaf0 net/ipv6/netfilter/ip6_tables.c:1719 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] nf_getsockopt+0x6a/0xc0 net/netfilter/nf_sockopt.c:122 ipv6_getsockopt+0x1df/0x2e0 net/ipv6/ipv6_sockglue.c:1378 udpv6_getsockopt+0x45/0x80 net/ipv6/udp.c:1441 sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2937 SYSC_getsockopt net/socket.c:1880 [inline] SyS_getsockopt+0x178/0x340 net/socket.c:1862 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x453299 RSP: 002b:00007fc9f6183c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299 RDX: 0000000000000041 RSI: 0000000000000029 RDI: 0000000000000014 RBP: 0000000000000389 R08: 0000000020c7a000 R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000212 R12: 00000000006f4578 R13: 00000000ffffffff R14: 00007fc9f61846d4 R15: 0000000000000000 A link change request failed with some changes committed already. Interface lo may have been left with an inconsistent configuration, please check. A link change request failed with some changes committed already. Interface lo may have been left with an inconsistent configuration, please check. TCP: request_sock_TCPv6: Possible SYN flooding on port 20022. Sending cookies. Check SNMP counters. netlink: 'syz-executor6': attribute type 1 has an invalid length. sctp: [Deprecated]: syz-executor7 (pid 6175) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor7 (pid 6175) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor7 (pid 6180) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor7 (pid 6180) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead syz-executor4 (6405) used greatest stack depth: 15456 bytes left xt_TCPMSS: Only works on TCP SYN packets IPv6: RTM_NEWROUTE with no NLM_F_CREATE or NLM_F_REPLACE IPv6: NLM_F_CREATE should be set when creating new route IPv6: RTM_NEWROUTE with no NLM_F_CREATE or NLM_F_REPLACE SELinux: unrecognized netlink message: protocol=4 nlmsg_type=2912 sclass=netlink_tcpdiag_socket pig=6495 comm=syz-executor4 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=2912 sclass=netlink_tcpdiag_socket pig=6507 comm=syz-executor4 netlink: 'syz-executor3': attribute type 11 has an invalid length. xt_hashlimit: overflow, rate too high: 0 netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 'syz-executor3': attribute type 11 has an invalid length. xt_hashlimit: overflow, rate too high: 0 netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. kauditd_printk_skb: 22 callbacks suppressed audit: type=1400 audit(1517430977.470:44): avc: denied { map } for pid=6724 comm="syz-executor3" path="socket:[16823]" dev="sockfs" ino=16823 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=tcp_socket permissive=1 netlink: 'syz-executor0': attribute type 33 has an invalid length. A link change request failed with some changes committed already. Interface syz0 may have been left with an inconsistent configuration, please check. sctp: [Deprecated]: syz-executor7 (pid 6811) Use of int in maxseg socket option. Use struct sctp_assoc_value instead netlink: 'syz-executor0': attribute type 33 has an invalid length. A link change request failed with some changes committed already. Interface syz0 may have been left with an inconsistent configuration, please check. sctp: [Deprecated]: syz-executor7 (pid 6829) Use of int in maxseg socket option. Use struct sctp_assoc_value instead netlink: 16 bytes leftover after parsing attributes in process `syz-executor4'. syz-executor2 (6919) used greatest stack depth: 13360 bytes left TCP: request_sock_TCP: Possible SYN flooding on port 20009. Sending cookies. Check SNMP counters. Cannot find del_set index 0 as target Cannot find del_set index 0 as target dccp_invalid_packet: P.Data Offset(172) too large dccp_invalid_packet: P.Data Offset(172) too large syz-executor0 uses obsolete (PF_INET,SOCK_PACKET) netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'. mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium dccp_xmit_packet: Payload too large (65423) for featneg. dccp_xmit_packet: Payload too large (65423) for featneg. netlink: 'syz-executor6': attribute type 4 has an invalid length. netlink: 8 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 'syz-executor6': attribute type 4 has an invalid length. netlink: 'syz-executor6': attribute type 1 has an invalid length. netlink: 'syz-executor6': attribute type 1 has an invalid length. netlink: 'syz-executor6': attribute type 1 has an invalid length. netlink: 'syz-executor6': attribute type 1 has an invalid length. dccp_close: ABORT with 4294967275 bytes unread audit: type=1400 audit(1517430979.072:45): avc: denied { create } for pid=7301 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_connector_socket permissive=1 audit: type=1400 audit(1517430979.098:46): avc: denied { write } for pid=7301 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_connector_socket permissive=1 audit: type=1400 audit(1517430979.099:47): avc: denied { accept } for pid=7301 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_connector_socket permissive=1 audit: type=1400 audit(1517430979.100:48): avc: denied { ioctl } for pid=7301 comm="syz-executor4" path="socket:[17263]" dev="sockfs" ino=17263 ioctlcmd=0x8933 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_connector_socket permissive=1 openvswitch: netlink: Flow set message rejected, Key attribute missing. openvswitch: netlink: Flow set message rejected, Key attribute missing. RDS: rds_bind could not find a transport for 224.0.0.2, load rds_tcp or rds_rdma? RDS: rds_bind could not find a transport for 224.0.0.2, load rds_tcp or rds_rdma? TCP: request_sock_TCPv6: Possible SYN flooding on port 20006. Sending cookies. Check SNMP counters. ipt_CLUSTERIP: Please specify destination IP ipt_CLUSTERIP: Please specify destination IP xt_TCPMSS: Only works on TCP SYN packets audit: type=1400 audit(1517430979.748:49): avc: denied { map } for pid=7566 comm="syz-executor4" path=2F616E6F6E5F6875676570616765202864656C6574656429 dev="hugetlbfs" ino=18495 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:hugetlbfs_t:s0 tclass=file permissive=1 openvswitch: netlink: ufid size 20 bytes exceeds the range (1, 16) openvswitch: netlink: Flow get message rejected, Key attribute missing. openvswitch: netlink: ufid size 20 bytes exceeds the range (1, 16) netlink: 8 bytes leftover after parsing attributes in process `syz-executor3'. openvswitch: netlink: Flow get message rejected, Key attribute missing. xt_ipcomp: unknown flags FF xt_ipcomp: unknown flags FF audit: type=1400 audit(1517430980.325:50): avc: denied { setopt } for pid=7761 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_netfilter_socket permissive=1 netlink: 'syz-executor1': attribute type 21 has an invalid length. netlink: 'syz-executor1': attribute type 21 has an invalid length. audit: type=1400 audit(1517430981.009:51): avc: denied { relabelto } for pid=8054 comm="syz-executor2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:policy_src_t:s0 tclass=packet permissive=1 l2tp_core: tunl 59: sockfd_lookup(fd=0) returned -88 l2tp_core: tunl 59: sockfd_lookup(fd=0) returned -88 Cannot find add_set index 0 as target ipt_CLUSTERIP: Please specify destination IP can: request_module (can-proto-0) failed. xt_TPROXY: Can be used only in combination with either -p tcp or -p udp ipt_CLUSTERIP: Please specify destination IP xt_TPROXY: Can be used only in combination with either -p tcp or -p udp xt_socket: unknown flags 0xfe can: request_module (can-proto-0) failed. Cannot find add_set index 0 as target xt_socket: unknown flags 0xfe skbuff: bad partial csum: csum=65535/65535 len=14 device bridge0 entered promiscuous mode netlink: 4 bytes leftover after parsing attributes in process `syz-executor7'. device bridge0 left promiscuous mode audit: type=1400 audit(1517430981.642:52): avc: denied { create } for pid=8306 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_iscsi_socket permissive=1 netlink: 'syz-executor5': attribute type 2 has an invalid length. netlink: 'syz-executor5': attribute type 2 has an invalid length. SELinux: unrecognized netlink message: protocol=4 nlmsg_type=24 sclass=netlink_tcpdiag_socket pig=8453 comm=syz-executor0 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=24 sclass=netlink_tcpdiag_socket pig=8456 comm=syz-executor0 audit: type=1400 audit(1517430982.188:53): avc: denied { bind } for pid=8512 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 ipt_ECN: cannot use TCP operations on a non-tcp rule ipt_ECN: cannot use TCP operations on a non-tcp rule netlink: 'syz-executor6': attribute type 1 has an invalid length. netlink: 'syz-executor6': attribute type 1 has an invalid length. sctp: [Deprecated]: syz-executor2 (pid 8899) Use of int in maxseg socket option. Use struct sctp_assoc_value instead audit: type=1400 audit(1517430983.042:54): avc: denied { setopt } for pid=8885 comm="syz-executor5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:unlabeled_t:s0 tclass=socket permissive=1 sctp: [Deprecated]: syz-executor2 (pid 8910) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor4 (pid 8964) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor1 (pid 8973) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor1 (pid 8980) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead Cannot find del_set index 0 as target netlink: 5 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 5 bytes leftover after parsing attributes in process `syz-executor0'. sctp: [Deprecated]: syz-executor7 (pid 9112) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor7 (pid 9137) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead syz-executor7 (9102) used greatest stack depth: 11792 bytes left net_ratelimit: 5 callbacks suppressed dccp_close: ABORT with 2 bytes unread audit: type=1400 audit(1517430984.272:55): avc: denied { shutdown } for pid=9336 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_netfilter_socket permissive=1 device syz1 entered promiscuous mode device syz1 left promiscuous mode audit: type=1400 audit(1517430984.502:56): avc: denied { ioctl } for pid=9433 comm="syz-executor1" path="socket:[19999]" dev="sockfs" ino=19999 ioctlcmd=0x8943 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 xt_connbytes: Forcing CT accounting to be enabled validate_nla: 2 callbacks suppressed netlink: 'syz-executor1': attribute type 3 has an invalid length. netlink: 'syz-executor1': attribute type 3 has an invalid length.