====================================================== WARNING: possible circular locking dependency detected 4.15.0-rc9+ #217 Not tainted ------------------------------------------------------ syz-executor4/5479 is trying to acquire lock: (&xt[i].mutex){+.+.}, at: [<00000000cfe40a1a>] xt_find_target+0x44/0x1e0 net/netfilter/x_tables.c:229 but task is already holding lock: (sk_lock-AF_INET6){+.+.}, at: [<00000000bb1a5470>] lock_sock include/net/sock.h:1463 [inline] (sk_lock-AF_INET6){+.+.}, at: [<00000000bb1a5470>] ipv6_setsockopt+0xff/0x150 net/ipv6/ipv6_sockglue.c:927 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 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905 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_target+0x44/0x1e0 net/netfilter/x_tables.c:229 xt_request_find_target+0x2c/0xb0 net/netfilter/x_tables.c:255 find_check_entry.isra.7+0x669/0xcf0 net/ipv6/netfilter/ip6_tables.c:572 translate_table+0xf52/0x1690 net/ipv6/netfilter/ip6_tables.c:749 do_replace net/ipv6/netfilter/ip6_tables.c:1165 [inline] do_ip6t_set_ctl+0x370/0x5f0 net/ipv6/netfilter/ip6_tables.c:1691 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0x115/0x150 net/ipv6/ipv6_sockglue.c:928 rawv6_setsockopt+0x4a/0xf0 net/ipv6/raw.c:1060 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 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-executor4/5479: #0: (sk_lock-AF_INET6){+.+.}, at: [<00000000bb1a5470>] lock_sock include/net/sock.h:1463 [inline] #0: (sk_lock-AF_INET6){+.+.}, at: [<00000000bb1a5470>] ipv6_setsockopt+0xff/0x150 net/ipv6/ipv6_sockglue.c:927 stack backtrace: CPU: 0 PID: 5479 Comm: syz-executor4 Not tainted 4.15.0-rc9+ #217 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_target+0x44/0x1e0 net/netfilter/x_tables.c:229 xt_request_find_target+0x2c/0xb0 net/netfilter/x_tables.c:255 find_check_entry.isra.7+0x669/0xcf0 net/ipv6/netfilter/ip6_tables.c:572 translate_table+0xf52/0x1690 net/ipv6/netfilter/ip6_tables.c:749 do_replace net/ipv6/netfilter/ip6_tables.c:1165 [inline] do_ip6t_set_ctl+0x370/0x5f0 net/ipv6/netfilter/ip6_tables.c:1691 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0x115/0x150 net/ipv6/ipv6_sockglue.c:928 rawv6_setsockopt+0x4a/0xf0 net/ipv6/raw.c:1060 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 RIP: 0033:0x453299 RSP: 002b:00007f888f91ac58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299 RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000013 RBP: 00000000000005c5 R08: 0000000000000400 R09: 0000000000000000 R10: 000000002000fc00 R11: 0000000000000212 R12: 00000000006f7b18 R13: 00000000ffffffff R14: 00007f888f91b6d4 R15: 0000000000000000 raw_sendmsg: syz-executor0 forgot to set AF_INET. Fix it! syz-executor7 uses obsolete (PF_INET,SOCK_PACKET) device lo entered promiscuous mode SELinux: unrecognized netlink message: protocol=4 nlmsg_type=771 sclass=netlink_tcpdiag_socket pig=5603 comm=syz-executor4 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=771 sclass=netlink_tcpdiag_socket pig=5611 comm=syz-executor4 netlink: 'syz-executor0': attribute type 18 has an invalid length. netlink: 'syz-executor0': attribute type 18 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'. device lo entered promiscuous mode SELinux: unrecognized netlink message: protocol=0 nlmsg_type=28474 sclass=netlink_route_socket pig=6010 comm=syz-executor3 audit: type=1400 audit(1517383058.813:24): avc: denied { map } for pid=5686 comm="syz-executor4" path="socket:[15196]" dev="sockfs" ino=15196 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_route_socket permissive=1 audit: type=1400 audit(1517383058.818:25): avc: denied { getattr } for pid=5690 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_generic_socket permissive=1 audit: type=1400 audit(1517383058.833:26): avc: denied { accept } for pid=5690 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_generic_socket permissive=1 audit: type=1400 audit(1517383058.834:27): avc: denied { create } for pid=5690 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 audit: type=1400 audit(1517383058.840:28): avc: denied { write } for pid=5690 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 audit: type=1400 audit(1517383059.062:29): avc: denied { map_create } for pid=5796 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=bpf permissive=1 netlink: 'syz-executor4': attribute type 18 has an invalid length. netlink: 'syz-executor4': attribute type 18 has an invalid length. 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) openvswitch: netlink: Flow get message rejected, Key attribute missing. IPv6: RTM_NEWROUTE with no NLM_F_CREATE or NLM_F_REPLACE IPv6: NLM_F_CREATE should be set when creating new route IPv6: NLM_F_CREATE should be set when creating new route IPv6: RTM_NEWROUTE with no NLM_F_CREATE or NLM_F_REPLACE netlink: 'syz-executor7': attribute type 1 has an invalid length. netlink: 'syz-executor7': attribute type 1 has an invalid length. IPv6: Can't replace route, no match found IPv6: Can't replace route, no match found netlink: 40 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 40 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 'syz-executor0': attribute type 1 has an invalid length. netlink: 'syz-executor0': attribute type 1 has an invalid length. netlink: 'syz-executor0': attribute type 28 has an invalid length. netlink: 'syz-executor0': attribute type 28 has an invalid length. netlink: 11 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 'syz-executor3': attribute type 3 has an invalid length. rdma_op 00000000d5ca0cd6 conn xmit_rdma (null) SELinux: unrecognized netlink message: protocol=0 nlmsg_type=56270 sclass=netlink_route_socket pig=7422 comm=syz-executor4 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=56270 sclass=netlink_route_socket pig=7446 comm=syz-executor4 kauditd_printk_skb: 14 callbacks suppressed audit: type=1400 audit(1517383063.829:44): avc: denied { ioctl } for pid=7449 comm="syz-executor5" path="socket:[17269]" dev="sockfs" ino=17269 ioctlcmd=0x642d 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_hashlimit: overflow, try lower: 18446744073709551488/1024 xt_hashlimit: overflow, try lower: 18446744073709551488/1024 sctp: [Deprecated]: syz-executor3 (pid 7514) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor3 (pid 7528) Use of int in maxseg socket option. Use struct sctp_assoc_value instead dccp_close: ABORT with 1 bytes unread Protocol error: SET target dimension is over the limit! audit: type=1400 audit(1517383064.373:45): avc: denied { read } for pid=7641 comm="syz-executor7" path="socket:[17845]" dev="sockfs" ino=17845 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 Protocol error: SET target dimension is over the limit! audit: type=1400 audit(1517383064.718:46): avc: denied { setopt } for pid=7742 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_crypto_socket permissive=1 netlink: 'syz-executor3': attribute type 13 has an invalid length. device syz1 entered promiscuous mode device syz1 left promiscuous mode device syz1 entered promiscuous mode netlink: 'syz-executor1': attribute type 21 has an invalid length. netlink: 'syz-executor1': attribute type 21 has an invalid length. audit: type=1400 audit(1517383065.187:47): avc: denied { ioctl } for pid=7939 comm="syz-executor6" path="socket:[18635]" dev="sockfs" ino=18635 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_crypto_socket permissive=1 audit: type=1400 audit(1517383065.355:48): avc: denied { map } for pid=7964 comm="syz-executor1" path=2F616E6F6E5F6875676570616765202864656C6574656429 dev="hugetlbfs" ino=18088 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:hugetlbfs_t:s0 tclass=file permissive=1 device syz5 entered promiscuous mode device syz5 left promiscuous mode device syz5 entered promiscuous mode device syz5 left promiscuous mode netlink: 'syz-executor5': attribute type 16 has an invalid length. netlink: 'syz-executor5': attribute type 29 has an invalid length. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=2831 sclass=netlink_route_socket pig=8138 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=2831 sclass=netlink_route_socket pig=8138 comm=syz-executor5 bpf: check failed: parse error bpf: check failed: parse error sctp: [Deprecated]: syz-executor1 (pid 8204) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead audit: type=1400 audit(1517383066.008:49): avc: denied { bind } for pid=8211 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 sctp: [Deprecated]: syz-executor1 (pid 8218) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead audit: type=1400 audit(1517383066.120:50): avc: denied { create } for pid=8223 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_fib_lookup_socket permissive=1 netlink: 'syz-executor0': attribute type 1 has an invalid length. netlink: 'syz-executor0': attribute type 1 has an invalid length. xt_CONNSECMARK: invalid mode: 0 xt_CONNSECMARK: invalid mode: 0 audit: type=1400 audit(1517383066.455:51): avc: denied { create } for pid=8320 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_scsitransport_socket permissive=1 Cannot find add_set index 0 as target Cannot find add_set index 0 as target 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=2054 sclass=netlink_route_socket pig=8486 comm=syz-executor0 dccp_invalid_packet: invalid packet type dccp_invalid_packet: invalid packet type SELinux: unrecognized netlink message: protocol=0 nlmsg_type=2054 sclass=netlink_route_socket pig=8486 comm=syz-executor0 KCM: Hard failure on kcm_write_msgs audit: type=1400 audit(1517383067.132:52): avc: denied { getattr } for pid=8564 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 netlink: 11 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor5'. xt_CONNSECMARK: target only valid in the 'mangle' or 'security' tables, not 'filuer'. xt_CONNSECMARK: target only valid in the 'mangle' or 'security' tables, not 'filuer'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor4'. Dead loop on virtual device ip6_vti0, fix it urgently! dccp_invalid_packet: pskb_may_pull failed dccp_invalid_packet: pskb_may_pull failed