netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'. ====================================================== WARNING: possible circular locking dependency detected 4.15.0+ #221 Not tainted ------------------------------------------------------ syz-executor3/5627 is trying to acquire lock: (sk_lock-AF_INET6){+.+.}, at: [<000000005bcb19be>] lock_sock include/net/sock.h:1463 [inline] (sk_lock-AF_INET6){+.+.}, at: [<000000005bcb19be>] do_ipv6_setsockopt.isra.8+0x3c5/0x39d0 net/ipv6/ipv6_sockglue.c:167 but task is already holding lock: (rtnl_mutex){+.+.}, at: [<000000001f0e7db0>] 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_ip6t_get_ctl+0x159/0xaf0 net/ipv6/netfilter/ip6_tables.c:1710 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 -> #0 (sk_lock-AF_INET6){+.+.}: 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_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 other info that might help us debug this: Chain exists of: sk_lock-AF_INET6 --> &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_INET6); *** DEADLOCK *** 1 lock held by syz-executor3/5627: #0: (rtnl_mutex){+.+.}, at: [<000000001f0e7db0>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 stack backtrace: CPU: 0 PID: 5627 Comm: syz-executor3 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_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 RIP: 0033:0x453299 RSP: 002b:00007f426abc9c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299 RDX: 0000000000000001 RSI: 0000000000000029 RDI: 0000000000000013 RBP: 00000000000005cd R08: 0000000000000004 R09: 0000000000000000 R10: 000000002095affc R11: 0000000000000212 R12: 00000000006f7bd8 R13: 00000000ffffffff R14: 00007f426abca6d4 R15: 0000000000000000 device syz1 entered promiscuous mode syz-executor1 uses obsolete (PF_INET,SOCK_PACKET) device syz1 left promiscuous mode netlink: 'syz-executor5': attribute type 18 has an invalid length. syz-executor3 (5736) used greatest stack depth: 16688 bytes left SELinux: unrecognized netlink message: protocol=4 nlmsg_type=39455 sclass=netlink_tcpdiag_socket pig=5870 comm=syz-executor0 can: request_module (can-proto-6) failed. SELinux: unrecognized netlink message: protocol=4 nlmsg_type=39455 sclass=netlink_tcpdiag_socket pig=5891 comm=syz-executor0 can: request_module (can-proto-6) failed. ipt_rpfilter: unknown options encountered ip_tables: iptables: counters copy to user failed while replacing table ipt_rpfilter: unknown options encountered netlink: 11 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor4'. sctp: [Deprecated]: syz-executor1 (pid 6117) Use of int in max_burst socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor1 (pid 6117) Use of int in max_burst socket option. Use struct sctp_assoc_value instead SELinux: unrecognized netlink message: protocol=4 nlmsg_type=25 sclass=netlink_tcpdiag_socket pig=6136 comm=syz-executor5 syz-executor4 (6285) used greatest stack depth: 16576 bytes left ip6t_REJECT: TCP_RESET illegal for non-tcp openvswitch: netlink: Flow get message rejected, Key attribute missing. ip6t_REJECT: TCP_RESET illegal for non-tcp openvswitch: netlink: Flow get message rejected, Key attribute missing. device syz7 entered promiscuous mode netlink: 'syz-executor1': attribute type 17 has an invalid length. netlink: 'syz-executor1': attribute type 17 has an invalid length. TCP: request_sock_TCP: Possible SYN flooding on port 20026. Sending cookies. Check SNMP counters. netlink: 20 bytes leftover after parsing attributes in process `syz-executor4'. tc_dump_action: action bad kind netlink: 20 bytes leftover after parsing attributes in process `syz-executor4'. tc_dump_action: action bad kind netlink: 'syz-executor1': attribute type 21 has an invalid length. SELinux: unrecognized netlink message: protocol=9 nlmsg_type=16 sclass=netlink_audit_socket pig=6711 comm=syz-executor6 ipt_CLUSTERIP: bad local_nodes[1] 0 ipt_CLUSTERIP: bad local_nodes[1] 0 kauditd_printk_skb: 10 callbacks suppressed audit: type=1400 audit(1517820356.308:32): avc: denied { ioctl } for pid=6805 comm="syz-executor0" path="socket:[16320]" dev="sockfs" ino=16320 ioctlcmd=0x890c 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 audit: type=1400 audit(1517820356.354:33): avc: denied { net_bind_service } for pid=6826 comm="syz-executor3" capability=10 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 audit: type=1400 audit(1517820356.388:34): avc: denied { map } for pid=6841 comm="syz-executor6" path="pipe:[16332]" dev="pipefs" ino=16332 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=fifo_file permissive=1 sock: sock_set_timeout: `syz-executor0' (pid 6861) tries to set negative timeout sock: sock_set_timeout: `syz-executor0' (pid 6869) tries to set negative timeout netlink: 'syz-executor5': attribute type 3 has an invalid length. audit: type=1400 audit(1517820356.712:35): avc: denied { accept } for pid=6944 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_generic_socket permissive=1 netlink: 'syz-executor5': attribute type 3 has an invalid length. sctp: [Deprecated]: syz-executor1 (pid 6994) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor1 (pid 6994) Use of int in maxseg socket option. Use struct sctp_assoc_value instead TCP: request_sock_TCPv6: Possible SYN flooding on port 20014. Sending cookies. Check SNMP counters. syz0: Invalid MTU 5 requested, hw min 68 syz0: Invalid MTU 5 requested, hw min 68 device lo entered promiscuous mode audit: type=1400 audit(1517820357.121:36): avc: denied { accept } for pid=7107 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 netlink: 1 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 'syz-executor0': attribute type 16 has an invalid length. netlink: 'syz-executor0': attribute type 16 has an invalid length. netlink: 'syz-executor6': attribute type 7 has an invalid length. netlink: 'syz-executor6': attribute type 7 has an invalid length. device syz0 entered promiscuous mode device syz0 left promiscuous mode device syz0 entered promiscuous mode device syz0 left promiscuous mode TCP: request_sock_TCP: Possible SYN flooding on port 20009. Sending cookies. Check SNMP counters. netlink: 4096 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 4096 bytes leftover after parsing attributes in process `syz-executor5'. sctp: [Deprecated]: syz-executor1 (pid 7421) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor1 (pid 7429) Use of int in maxseg socket option. Use struct sctp_assoc_value instead netlink: 12 bytes leftover after parsing attributes in process `syz-executor6'. ieee80211 phy2: Selected rate control algorithm 'minstrel_ht' netlink: 12 bytes leftover after parsing attributes in process `syz-executor6'. ieee80211 phy3: Selected rate control algorithm 'minstrel_ht' sctp: [Deprecated]: syz-executor2 (pid 7492) Use of int in max_burst socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor2 (pid 7518) Use of int in max_burst socket option. Use struct sctp_assoc_value instead audit: type=1400 audit(1517820358.488:37): avc: denied { getattr } for pid=7622 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_crypto_socket permissive=1 netlink: 76 bytes leftover after parsing attributes in process `syz-executor3'. ipt_CLUSTERIP: Please specify destination IP ipt_CLUSTERIP: Please specify destination IP audit: type=1400 audit(1517820359.733:38): avc: denied { setopt } for pid=8188 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_crypto_socket permissive=1 dccp_close: ABORT with 44 bytes unread l2tp_core: tunl 59: sockfd_lookup(fd=0) returned -88 l2tp_core: tunl 59: sockfd_lookup(fd=0) returned -88 audit: type=1400 audit(1517820359.890:39): avc: denied { getopt } for pid=8242 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 validate_nla: 2 callbacks suppressed netlink: 'syz-executor5': attribute type 21 has an invalid length. audit: type=1400 audit(1517820360.497:40): avc: denied { read } for pid=8457 comm="syz-executor0" 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 sctp: [Deprecated]: syz-executor4 (pid 8474) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor4 (pid 8474) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead 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 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=45546 sclass=netlink_route_socket pig=8580 comm=syz-executor3 audit: type=1400 audit(1517820360.825:41): avc: denied { create } for pid=8571 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_scsitransport_socket permissive=1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=45546 sclass=netlink_route_socket pig=8598 comm=syz-executor3 kauditd_printk_skb: 2 callbacks suppressed audit: type=1400 audit(1517820361.475:44): avc: denied { read } for pid=8825 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_generic_socket permissive=1 Cannot find add_set index 0 as target Cannot find add_set index 0 as target netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'. audit: type=1400 audit(1517820361.759:45): avc: denied { setopt } for pid=8922 comm="syz-executor0" 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: 3 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'. audit: type=1400 audit(1517820361.863:46): avc: denied { write } for pid=8945 comm="syz-executor0" 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(1517820361.887:47): avc: denied { read } for pid=8945 comm="syz-executor0" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:unlabeled_t:s0 tclass=socket permissive=1 syz-executor3 (9080) used greatest stack depth: 15360 bytes left netlink: 'syz-executor6': attribute type 1 has an invalid length. netlink: 'syz-executor6': attribute type 1 has an invalid length. dccp_xmit_packet: Payload too large (65423) for featneg. dccp_xmit_packet: Payload too large (65423) for featneg. dccp_close: ABORT with 65423 bytes unread