====================================================== WARNING: possible circular locking dependency detected 4.15.0+ #221 Not tainted ------------------------------------------------------ syz-executor0/4217 is trying to acquire lock: (rtnl_mutex){+.+.}, at: [<00000000ac220e5b>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 but task is already holding lock: (&xt[i].mutex){+.+.}, at: [<000000008835a5fc>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1041 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&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_revision+0xc9/0x2b0 net/netfilter/x_tables.c:372 do_ip6t_get_ctl+0x963/0xaf0 net/ipv6/netfilter/ip6_tables.c:1737 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:1371 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 -> #1 (sk_lock-AF_INET6){+.+.}: lock_sock_nested+0xc2/0x110 net/core/sock.c:2777 lock_sock include/net/sock.h:1463 [inline] do_ipv6_setsockopt.isra.8+0x3c5/0x39d0 net/ipv6/ipv6_sockglue.c:167 ipv6_setsockopt+0xd7/0x130 net/ipv6/ipv6_sockglue.c:922 rawv6_setsockopt+0x4a/0xf0 net/ipv6/raw.c:1060 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 -> #0 (rtnl_mutex){+.+.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 __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 other info that might help us debug this: Chain exists of: rtnl_mutex --> sk_lock-AF_INET6 --> &xt[i].mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&xt[i].mutex); lock(sk_lock-AF_INET6); lock(&xt[i].mutex); lock(rtnl_mutex); *** DEADLOCK *** 1 lock held by syz-executor0/4217: #0: (&xt[i].mutex){+.+.}, at: [<000000008835a5fc>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1041 stack backtrace: CPU: 1 PID: 4217 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 __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 RIP: 0033:0x455d8a RSP: 002b:0000000000a2f598 EFLAGS: 00000206 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00000000006f8a40 RCX: 0000000000455d8a RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000013 RBP: 00000000006f8a40 R08: 00000000000002d8 R09: 0000000000000001 R10: 00000000006f8e68 R11: 0000000000000206 R12: 0000000000000013 R13: 00000000006fb9e8 R14: 00000000000140a1 R15: 0000000000000001 can: request_module (can-proto-3) failed. can: request_module (can-proto-3) failed. SNAT: multiple ranges no longer supported SNAT: multiple ranges no longer supported Cannot find add_set index 0 as target Cannot find add_set index 0 as target dst_release: dst:0000000071c4d692 refcnt:-1 ipt_CLUSTERIP: unknown mode 3 ipt_CLUSTERIP: unknown mode 3 netlink: 'syz-executor6': attribute type 21 has an invalid length. netlink: 'syz-executor3': attribute type 1 has an invalid length. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=29876 sclass=netlink_route_socket pig=11259 comm=syz-executor6 sctp: [Deprecated]: syz-executor2 (pid 11304) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor2 (pid 11322) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor7 (pid 11422) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor7 (pid 11448) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=11461 comm=syz-executor5 netlink: 'syz-executor4': attribute type 21 has an invalid length. netlink: 'syz-executor1': attribute type 21 has an invalid length. netlink: 'syz-executor4': attribute type 21 has an invalid length. netlink: 'syz-executor1': attribute type 21 has an invalid length. netlink: 16 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor0'. dccp_invalid_packet: invalid packet type dccp_invalid_packet: invalid packet type 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 netlink: 'syz-executor7': attribute type 10 has an invalid length. ipt_CLUSTERIP: ipt_CLUSTERIP is deprecated and it will removed soon, use xt_cluster instead A link change request failed with some changes committed already. Interface syz5 may have been left with an inconsistent configuration, please check. A link change request failed with some changes committed already. Interface syz5 may have been left with an inconsistent configuration, please check. audit: type=1400 audit(1517788587.860:52): avc: denied { write } for pid=11902 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_crypto_socket permissive=1 netlink: 4 bytes leftover after parsing attributes in process `syz-executor7'. TCP: request_sock_TCPv6: Possible SYN flooding on port 20018. Sending cookies. Check SNMP counters. netlink: 4 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 'syz-executor7': attribute type 1 has an invalid length. dccp_invalid_packet: pskb_may_pull failed dccp_invalid_packet: pskb_may_pull failed device syz3 entered promiscuous mode IPVS: set_ctl: invalid protocol: 13703 39.52.93.236:60696 Ɓtpm`x/.HݼބDBC+ IPVS: set_ctl: invalid protocol: 13703 39.52.93.236:60696 Ɓtpm`x/.HݼބDBC+ audit: type=1400 audit(1517788588.822:53): avc: denied { connect } for pid=12239 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_crypto_socket permissive=1 Cannot find add_set index 2048 as target Cannot find add_set index 2048 as target netlink: 8 bytes leftover after parsing attributes in process `syz-executor1'. openvswitch: netlink: Message has 8 unknown bytes. openvswitch: netlink: Message has 8 unknown bytes. device syz7 entered promiscuous mode validate_nla: 1 callbacks suppressed netlink: 'syz-executor7': attribute type 21 has an invalid length. netlink: 'syz-executor7': attribute type 21 has an invalid length. Cannot find add_set index 0 as target Cannot find add_set index 0 as target netlink: 'syz-executor5': attribute type 4 has an invalid length. netlink: 'syz-executor5': attribute type 4 has an invalid length. l2tp_core: tunl 4: fd 19 wrong protocol, got 1, expected 17 sock: sock_set_timeout: `syz-executor2' (pid 12821) tries to set negative timeout l2tp_core: tunl 4: fd 19 wrong protocol, got 1, expected 17 netlink: 'syz-executor5': attribute type 29 has an invalid length. netlink: 'syz-executor5': attribute type 29 has an invalid length. netlink: 'syz-executor5': attribute type 29 has an invalid length. netlink: 416 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 416 bytes leftover after parsing attributes in process `syz-executor6'. audit: type=1400 audit(1517788590.818:54): avc: denied { net_broadcast } for pid=13010 comm="syz-executor7" 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 device bridge0 entered promiscuous mode device bridge0 left promiscuous mode ip_tables: iptables: counters copy to user failed while replacing table ip_tables: iptables: counters copy to user failed while replacing table netlink: 'syz-executor3': attribute type 21 has an invalid length. netlink: 11 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 'syz-executor3': attribute type 21 has an invalid length. sctp: [Deprecated]: syz-executor4 (pid 13242) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor4 (pid 13275) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead openvswitch: netlink: Flow key attr not present in new flow. openvswitch: netlink: Flow key attr not present in new flow. sit: non-ECT from 0.0.0.0 with TOS=0x7 audit: type=1400 audit(1517788593.008:55): avc: denied { relabelto } for pid=13832 comm="syz-executor3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:auditctl_exec_t:s0 tclass=packet permissive=1 xt_TPROXY: Can be used only in combination with either -p tcp or -p udp xt_TPROXY: Can be used only in combination with either -p tcp or -p udp TCP: request_sock_TCPv6: Possible SYN flooding on port 20026. Sending cookies. Check SNMP counters. audit: type=1400 audit(1517788593.548:56): avc: denied { setopt } for pid=14020 comm="syz-executor1" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:unlabeled_t:s0 tclass=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-executor1': attribute type 3 has an invalid length. xt_CONNSECMARK: target only valid in the 'mangle' or 'security' tables, not 'filter'. xt_CONNSECMARK: target only valid in the 'mangle' or 'security' tables, not 'filter'. xt_HMARK: hash modulus can't be zero net_ratelimit: 7 callbacks suppressed dccp_close: ABORT with 254 bytes unread