====================================================== WARNING: possible circular locking dependency detected 4.15.0-rc9+ #213 Not tainted ------------------------------------------------------ syz-executor2/5329 is trying to acquire lock: (&xt[i].mutex){+.+.}, at: [<00000000fe107ac6>] xt_find_revision+0xc9/0x2b0 net/netfilter/x_tables.c:367 but task is already holding lock: (sk_lock-AF_INET6){+.+.}, at: [<00000000dbb8a414>] lock_sock include/net/sock.h:1463 [inline] (sk_lock-AF_INET6){+.+.}, at: [<00000000dbb8a414>] 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 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 -> #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:2872 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_revision+0xc9/0x2b0 net/netfilter/x_tables.c:367 do_ip6t_get_ctl+0x963/0xaf0 net/ipv6/netfilter/ip6_tables.c:1742 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 tcp_getsockopt+0x82/0xd0 net/ipv4/tcp.c:3326 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-executor2/5329: #0: (sk_lock-AF_INET6){+.+.}, at: [<00000000dbb8a414>] lock_sock include/net/sock.h:1463 [inline] #0: (sk_lock-AF_INET6){+.+.}, at: [<00000000dbb8a414>] ipv6_getsockopt+0x1c5/0x2e0 net/ipv6/ipv6_sockglue.c:1377 stack backtrace: CPU: 0 PID: 5329 Comm: syz-executor2 Not tainted 4.15.0-rc9+ #213 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_revision+0xc9/0x2b0 net/netfilter/x_tables.c:367 do_ip6t_get_ctl+0x963/0xaf0 net/ipv6/netfilter/ip6_tables.c:1742 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 tcp_getsockopt+0x82/0xd0 net/ipv4/tcp.c:3326 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:00007f96e9c0fc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299 RDX: 0000000000000045 RSI: 0000000000000029 RDI: 0000000000000014 RBP: 00000000000003d6 R08: 00000000200df000 R09: 0000000000000000 R10: 00000000200df000 R11: 0000000000000212 R12: 00000000006f4cb0 R13: 00000000ffffffff R14: 00007f96e9c106d4 R15: 0000000000000000 Cannot find add_set index 0 as target TCP: request_sock_TCPv6: Possible SYN flooding on port 20030. Sending cookies. Check SNMP counters. netlink: 'syz-executor7': attribute type 16 has an invalid length. netlink: 'syz-executor7': attribute type 16 has an invalid length. netlink: 'syz-executor1': attribute type 21 has an invalid length. netlink: 'syz-executor1': attribute type 21 has an invalid length. RDS: rds_bind could not find a transport for 172.20.0.20, load rds_tcp or rds_rdma? RDS: rds_bind could not find a transport for 172.20.0.20, load rds_tcp or rds_rdma? Cannot find add_set index 0 as target netlink: 1 bytes leftover after parsing attributes in process `syz-executor6'. raw_sendmsg: syz-executor3 forgot to set AF_INET. Fix it! netlink: 1 bytes leftover after parsing attributes in process `syz-executor6'. kauditd_printk_skb: 9 callbacks suppressed audit: type=1400 audit(1517183496.141:31): avc: denied { name_connect } for pid=5721 comm="syz-executor4" dest=20019 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:port_t:s0 tclass=dccp_socket permissive=1 dccp_close: ABORT with 253 bytes unread sit: non-ECT from 0.0.0.0 with TOS=0x2 sit: non-ECT from 0.0.0.0 with TOS=0x2 audit: type=1400 audit(1517183496.466:32): avc: denied { map } for pid=5831 comm="syz-executor5" path="socket:[15498]" dev="sockfs" ino=15498 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_xfrm_socket permissive=1 TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. audit: type=1400 audit(1517183496.574:33): avc: denied { map } for pid=5860 comm="syz-executor0" path="socket:[15524]" dev="sockfs" ino=15524 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 audit: type=1400 audit(1517183496.728:34): avc: denied { read } for pid=5915 comm="syz-executor4" path="socket:[14651]" dev="sockfs" ino=14651 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-executor4': attribute type 1 has an invalid length. netlink: 'syz-executor4': attribute type 1 has an invalid length. audit: type=1400 audit(1517183496.932:35): avc: denied { setopt } for pid=6007 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_crypto_socket permissive=1 xt_hashlimit: overflow, try lower: 0/0 xt_hashlimit: overflow, try lower: 0/0 xt_connbytes: Forcing CT accounting to be enabled ipt_REJECT: TCP_RESET invalid for non-tcp ipt_REJECT: TCP_RESET invalid for non-tcp xt_CT: netfilter: NOTRACK target is deprecated, use CT instead or upgrade iptables audit: type=1400 audit(1517183497.307:36): avc: denied { accept } for pid=6130 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_netfilter_socket permissive=1 xt_nfacct: accounting object with name `syz1' does not exists netlink: 2 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 2 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 'syz-executor2': attribute type 21 has an invalid length. netlink: 'syz-executor2': attribute type 21 has an invalid length. Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable netlink: 17 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 5 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 5 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 17 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor1'. audit: type=1400 audit(1517183498.440:37): avc: denied { setopt } for pid=6534 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 syz-executor0 (6517) used greatest stack depth: 15648 bytes left netlink: 16 bytes leftover after parsing attributes in process `syz-executor1'. audit: type=1400 audit(1517183498.812:38): avc: denied { getattr } for pid=6663 comm="syz-executor5" 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 syz6 entered promiscuous mode netlink: 'syz-executor7': attribute type 21 has an invalid length. netlink: 'syz-executor7': attribute type 21 has an invalid length. netlink: 'syz-executor3': attribute type 21 has an invalid length. netlink: 'syz-executor3': attribute type 21 has an invalid length. sctp: [Deprecated]: syz-executor1 (pid 6876) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor1 (pid 6856) Use of int in maxseg socket option. Use struct sctp_assoc_value instead audit: type=1400 audit(1517183499.519:39): avc: denied { getopt } for pid=6917 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_generic_socket permissive=1 openvswitch: netlink: Message has 4 unknown bytes. TCP: request_sock_TCPv6: Possible SYN flooding on port 20026. Sending cookies. Check SNMP counters. netlink: 'syz-executor4': attribute type 1 has an invalid length. netlink: 'syz-executor4': attribute type 1 has an invalid length. audit: type=1400 audit(1517183499.825:40): avc: denied { ioctl } for pid=7025 comm="syz-executor0" path="socket:[17470]" dev="sockfs" ino=17470 ioctlcmd=0x89a0 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-executor5 (pid 7104) Use of int in maxseg socket option. Use struct sctp_assoc_value instead dccp_xmit_packet: Payload too large (65423) for featneg. dccp_xmit_packet: Payload too large (65423) for featneg. sctp: [Deprecated]: syz-executor5 (pid 7112) Use of int in maxseg socket option. Use struct sctp_assoc_value instead ipt_ECN: cannot use TCP operations on a non-tcp rule ipt_ECN: cannot use TCP operations on a non-tcp rule xt_SECMARK: invalid mode: 0 xt_SECMARK: invalid mode: 0 Cannot find add_set index 0 as target Cannot find add_set index 0 as target xt_cgroup: invalid path, errno=-2 xt_CT: No such helper "pptp" xt_CT: No such helper "pptp" sctp: [Deprecated]: syz-executor5 (pid 7548) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead Unknown options in mask 4 sctp: [Deprecated]: syz-executor5 (pid 7560) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead Unknown options in mask 4 kauditd_printk_skb: 1 callbacks suppressed audit: type=1400 audit(1517183501.455:42): avc: denied { write } for pid=7656 comm="syz-executor4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:unlabeled_t:s0 tclass=socket permissive=1 audit: type=1400 audit(1517183501.485:43): avc: denied { ioctl } for pid=7656 comm="syz-executor4" path="socket:[17029]" dev="sockfs" ino=17029 ioctlcmd=0x5411 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=sock_file permissive=1 device syz7 entered promiscuous mode dccp_close: ABORT with 254 bytes unread syz-executor2 (7755) used greatest stack depth: 14976 bytes left nla_parse: 4 callbacks suppressed netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'. ipt_REJECT: TCP_RESET invalid for non-tcp netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'. xt_policy: too many policy elements xt_policy: too many policy elements ipt_REJECT: TCP_RESET invalid for non-tcp openvswitch: netlink: Message has 4 unknown bytes. openvswitch: netlink: Message has 4 unknown bytes. Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable device syz4 entered promiscuous mode device syz4 left promiscuous mode validate_nla: 5 callbacks suppressed netlink: 'syz-executor4': attribute type 1 has an invalid length. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=1 sclass=netlink_route_socket pig=8278 comm=syz-executor0 netlink: 'syz-executor4': attribute type 1 has an invalid length. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=1 sclass=netlink_route_socket pig=8289 comm=syz-executor0 audit: type=1400 audit(1517183503.231:44): avc: denied { read } for pid=8310 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 DRBG: could not allocate CTR cipher TFM handle: ctr(aes) dccp_xmit_packet: Payload too large (65423) for featneg. dccp_xmit_packet: Payload too large (65423) for featneg. audit: type=1400 audit(1517183504.126:45): avc: denied { getattr } for pid=8599 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