====================================================== WARNING: possible circular locking dependency detected 4.15.0-rc9+ #218 Not tainted ------------------------------------------------------ syz-executor7/5677 is trying to acquire lock: (&xt[i].mutex){+.+.}, at: [<0000000064fdfffc>] xt_find_target+0x44/0x1e0 net/netfilter/x_tables.c:229 but task is already holding lock: (sk_lock-AF_INET6){+.+.}, at: [<00000000b5a7b34a>] lock_sock include/net/sock.h:1463 [inline] (sk_lock-AF_INET6){+.+.}, at: [<00000000b5a7b34a>] 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 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_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 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 other info that might help us debug this: netlink: 16 bytes leftover after parsing attributes in process `syz-executor0'. Chain exists of: &xt[i].mutex --> rtnl_mutex --> sk_lock-AF_INET6 Possible unsafe locking scenario: CPU0 CPU1 netlink: 16 bytes leftover after parsing attributes in process `syz-executor0'. ---- ---- lock(sk_lock-AF_INET6); lock(rtnl_mutex); lock(sk_lock-AF_INET6); lock(&xt[i].mutex); *** DEADLOCK *** 1 lock held by syz-executor7/5677: #0: (sk_lock-AF_INET6){+.+.}, at: [<00000000b5a7b34a>] lock_sock include/net/sock.h:1463 [inline] #0: (sk_lock-AF_INET6){+.+.}, at: [<00000000b5a7b34a>] ipv6_setsockopt+0xff/0x150 net/ipv6/ipv6_sockglue.c:927 stack backtrace: CPU: 0 PID: 5677 Comm: syz-executor7 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_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 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 RIP: 0033:0x453299 RSP: 002b:00007fbb72070c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299 RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000013 RBP: 00000000000005c5 R08: 00000000000003e0 R09: 0000000000000000 R10: 0000000020002000 R11: 0000000000000212 R12: 00000000006f7b18 R13: 00000000ffffffff R14: 00007fbb720716d4 R15: 0000000000000000 xt_CT: netfilter: NOTRACK target is deprecated, use CT instead or upgrade iptables sctp: [Deprecated]: syz-executor6 (pid 5757) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor6 (pid 5768) Use of int in maxseg socket option. Use struct sctp_assoc_value instead xt_DSCP: dscp fc out of range DRBG: could not allocate CTR cipher TFM handle: ctr(aes) syz-executor0 uses obsolete (PF_INET,SOCK_PACKET) IPv6: Can't replace route, no match found IPv6: Can't replace route, no match found netlink: 8 bytes leftover after parsing attributes in process `syz-executor1'. mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium raw_sendmsg: syz-executor3 forgot to set AF_INET. Fix it! Cannot find add_set index 40101 as target Cannot find add_set index 40101 as target sctp: [Deprecated]: syz-executor5 (pid 6436) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor5 (pid 6451) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sock: sock_set_timeout: `syz-executor7' (pid 6483) tries to set negative timeout netlink: 11 bytes leftover after parsing attributes in process `syz-executor7'. kauditd_printk_skb: 15 callbacks suppressed audit: type=1400 audit(1517417775.725:37): avc: denied { getopt } for pid=6527 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: 'syz-executor5': attribute type 1 has an invalid length. netlink: 11 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 'syz-executor5': attribute type 1 has an invalid length. 8021q: VLANs not supported on lo audit: type=1400 audit(1517417775.937:38): avc: denied { map } for pid=6613 comm="syz-executor5" path=2F616E6F6E5F6875676570616765202864656C6574656429 dev="hugetlbfs" ino=15991 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:hugetlbfs_t:s0 tclass=file permissive=1 netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'. audit: type=1400 audit(1517417775.982:39): avc: denied { getopt } for pid=6626 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 netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'. 8021q: VLANs not supported on lo netlink: 'syz-executor3': attribute type 20 has an invalid length. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 'syz-executor3': attribute type 20 has an invalid length. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. audit: type=1400 audit(1517417776.216:40): avc: denied { bind } for pid=6703 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 dccp_close: ABORT with 4294967275 bytes unread dccp_close: ABORT with 242 bytes unread netlink: 16 bytes leftover after parsing attributes in process `syz-executor3'. syz7: Invalid MTU 0 requested, hw min 68 IPv4: Oversized IP packet from 127.0.0.1 IPv4: Oversized IP packet from 127.0.0.1 IPv4: Oversized IP packet from 127.0.0.1 net_ratelimit: 2 callbacks suppressed 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. mip6: mip6_destopt_init_state: spi is not 0: 3909353472 mip6: mip6_destopt_init_state: spi is not 0: 3909353472 xt_AUDIT: Audit type out of range (valid range: 0..2) xt_CT: You must specify a L4 protocol, and not use inversions on it. xt_CT: You must specify a L4 protocol, and not use inversions on it. IPv4: Oversized IP packet from 127.0.0.1 IPv4: Oversized IP packet from 127.0.0.1 nla_parse: 1 callbacks suppressed netlink: 17 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 17 bytes leftover after parsing attributes in process `syz-executor3'. kernel msg: ebtables bug: please report to author: Wrong len argument x_tables: ip_tables: osf match: only valid for protocol 6 x_tables: ip_tables: osf match: only valid for protocol 6 audit: type=1400 audit(1517417780.002:41): avc: denied { write } for pid=8135 comm="syz-executor3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:unlabeled_t:s0 tclass=socket permissive=1 syz-executor4 (8153) used greatest stack depth: 12080 bytes left netlink: 'syz-executor4': attribute type 21 has an invalid length. device lo entered promiscuous mode netlink: 'syz-executor4': attribute type 21 has an invalid length. device lo left promiscuous mode device lo entered promiscuous mode device lo left promiscuous mode netlink: 4 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor0'. device lo entered promiscuous mode device lo left promiscuous mode dccp_close: ABORT with 254 bytes unread mip6: mip6_rthdr_init_state: state's mode is not 2: 0 mip6: mip6_rthdr_init_state: state's mode is not 2: 0 audit: type=1400 audit(1517417780.822:42): avc: denied { getopt } for pid=8436 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 audit: type=1400 audit(1517417780.823:43): avc: denied { read } for pid=8436 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 audit: type=1400 audit(1517417780.878:44): avc: denied { relabelto } for pid=8433 comm="syz-executor1" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:policy_src_t:s0 tclass=packet permissive=1 netlink: 11 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor0'. sctp: [Deprecated]: syz-executor6 (pid 8597) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead ip_tunnel: non-ECT from 0.0.0.0 with TOS=0x3 ip_tunnel: non-ECT from 0.0.0.0 with TOS=0x3 netlink: 3 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 'syz-executor2': attribute type 1 has an invalid length. audit: type=1400 audit(1517417781.673:45): avc: denied { write } for pid=8757 comm="syz-executor3" path="socket:[19338]" dev="sockfs" ino=19338 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-executor2': attribute type 1 has an invalid length. audit: type=1400 audit(1517417781.861:46): avc: denied { map } for pid=8838 comm="syz-executor0" path="socket:[19387]" dev="sockfs" ino=19387 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=rawip_socket permissive=1 xt_connbytes: Forcing CT accounting to be enabled xt_hashlimit: hashlimit invalid rate xt_hashlimit: hashlimit invalid rate device syz5 entered promiscuous mode device syz5 left promiscuous mode device syz5 entered promiscuous mode TCP: request_sock_TCPv6: Possible SYN flooding on port 20026. Sending cookies. Check SNMP counters.