====================================================== WARNING: possible circular locking dependency detected audit: type=1400 audit(1517526242.690:20): avc: denied { create } for pid=5499 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 audit: type=1400 audit(1517526242.692:21): avc: denied { write } for pid=5499 comm="syz-executor1" path="socket:[14821]" dev="sockfs" ino=14821 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-executor1'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor1'. 4.15.0+ #220 Not tainted ------------------------------------------------------ syz-executor7/5503 is trying to acquire lock: (&xt[i].mutex){+.+.}, at: [<000000008b066002>] xt_find_target+0x44/0x1e0 net/netfilter/x_tables.c:229 but task is already holding lock: (sk_lock-AF_INET6){+.+.}, at: [<00000000ababf58d>] lock_sock include/net/sock.h:1461 [inline] (sk_lock-AF_INET6){+.+.}, at: [<00000000ababf58d>] 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:1461 [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:4104 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: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+0xa1/0xb0 net/ipv4/ip_sockglue.c:1260 sctp_setsockopt+0x2b6/0x61d0 net/sctp/socket.c:4104 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: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 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:567 translate_table+0xf52/0x1690 net/ipv6/netfilter/ip6_tables.c:744 do_replace net/ipv6/netfilter/ip6_tables.c:1160 [inline] do_ip6t_set_ctl+0x370/0x5f0 net/ipv6/netfilter/ip6_tables.c:1686 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 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 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-executor7/5503: #0: (sk_lock-AF_INET6){+.+.}, at: [<00000000ababf58d>] lock_sock include/net/sock.h:1461 [inline] #0: (sk_lock-AF_INET6){+.+.}, at: [<00000000ababf58d>] ipv6_setsockopt+0xff/0x150 net/ipv6/ipv6_sockglue.c:927 stack backtrace: CPU: 0 PID: 5503 Comm: syz-executor7 Not tainted 4.15.0+ #220 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 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:567 translate_table+0xf52/0x1690 net/ipv6/netfilter/ip6_tables.c:744 do_replace net/ipv6/netfilter/ip6_tables.c:1160 [inline] do_ip6t_set_ctl+0x370/0x5f0 net/ipv6/netfilter/ip6_tables.c:1686 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 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 RIP: 0033:0x453299 RSP: 002b:00007fe44134ec58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299 RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000013 RBP: 00000000000004e6 R08: 0000000000000469 R09: 0000000000000000 R10: 0000000020019c48 R11: 0000000000000212 R12: 00000000006f6630 R13: 00000000ffffffff R14: 00007fe44134f6d4 R15: 0000000000000000 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium ip_tunnel: non-ECT from 0.0.0.0 with TOS=0x1 audit: type=1400 audit(1517526243.566:22): avc: denied { map_read map_write } for pid=5544 comm="syz-executor7" 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 ip_tunnel: non-ECT from 0.0.0.0 with TOS=0x1 audit: type=1400 audit(1517526243.640:23): avc: denied { prog_run } for pid=5562 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=bpf permissive=1 syz-executor3 uses obsolete (PF_INET,SOCK_PACKET) TCP: request_sock_TCPv6: Possible SYN flooding on port 20026. Sending cookies. Check SNMP counters. audit: type=1400 audit(1517526243.770:24): avc: denied { bind } for pid=5614 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_hashlimit: Unknown mode mask 200, kernel too old? netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. xt_hashlimit: Unknown mode mask 200, kernel too old? audit: type=1400 audit(1517526243.803:25): avc: denied { setopt } for pid=5623 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 RDS: rds_bind could not find a transport for 172.20.0.170, load rds_tcp or rds_rdma? dccp_invalid_packet: P.Data Offset(0) too small audit: type=1400 audit(1517526244.326:26): avc: denied { accept } for pid=5805 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_netfilter_socket permissive=1 netlink: 'syz-executor2': attribute type 1 has an invalid length. RDS: rds_bind could not find a transport for 172.20.0.170, load rds_tcp or rds_rdma? netlink: 'syz-executor2': attribute type 1 has an invalid length. syz0: Invalid MTU 0 requested, hw min 68 syz0: Invalid MTU 0 requested, hw min 68 audit: type=1400 audit(1517526244.620:27): avc: denied { name_connect } for pid=5920 comm="syz-executor7" dest=20028 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:port_t:s0 tclass=dccp_socket permissive=1 tc_dump_action: action bad kind audit: type=1400 audit(1517526244.627:28): avc: denied { name_bind } for pid=5920 comm="syz-executor7" src=20028 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:port_t:s0 tclass=dccp_socket permissive=1 xt_l2tp: v2 doesn't support IP mode xt_l2tp: v2 tid > 0xffff: 4294967295 xt_l2tp: v2 tid > 0xffff: 4294967295 syz-executor6 (6205) used greatest stack depth: 15552 bytes left netlink: 'syz-executor3': attribute type 3 has an invalid length. netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. Protocol error: SET target dimension is over the limit! Protocol error: SET target dimension is over the limit! device lo entered promiscuous mode device lo left promiscuous mode TCP: request_sock_TCP: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. syz-executor0 (6490) used greatest stack depth: 13296 bytes left netlink: 'syz-executor7': attribute type 6 has an invalid length. netlink: 3 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor0'. device syz3 entered promiscuous mode device syz3 left promiscuous mode IPv4: Oversized IP packet from 127.0.0.1 xt_socket: unknown flags 0xec 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. validate_nla: 2 callbacks suppressed netlink: 'syz-executor4': attribute type 21 has an invalid length. netlink: 'syz-executor4': attribute type 21 has an invalid length. netlink: 4 bytes leftover after parsing attributes in process `syz-executor4'. SELinux: unrecognized netlink message: protocol=6 nlmsg_type=0 sclass=netlink_xfrm_socket pig=7014 comm=syz-executor4 kauditd_printk_skb: 8 callbacks suppressed audit: type=1400 audit(1517526250.012:37): avc: denied { write } for pid=7100 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 audit: type=1400 audit(1517526250.047:38): avc: denied { accept } for pid=7100 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 audit: type=1400 audit(1517526250.074:39): avc: denied { create } for pid=7110 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_fib_lookup_socket permissive=1 audit: type=1400 audit(1517526250.075:40): avc: denied { write } for pid=7110 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_fib_lookup_socket permissive=1 audit: type=1400 audit(1517526250.076:41): avc: denied { read } for pid=7110 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_fib_lookup_socket permissive=1 ieee80211 phy2: Selected rate control algorithm 'minstrel_ht' ieee80211 phy3: Selected rate control algorithm 'minstrel_ht' netlink: 'syz-executor7': attribute type 12 has an invalid length. ieee80211 phy4: Selected rate control algorithm 'minstrel_ht' netlink: 'syz-executor7': attribute type 12 has an invalid length. ieee80211 phy5: Selected rate control algorithm 'minstrel_ht' netlink: 4 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. audit: type=1400 audit(1517526250.721:42): avc: denied { ioctl } for pid=7368 comm="syz-executor3" path="socket:[17521]" dev="sockfs" ino=17521 ioctlcmd=0x8946 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(1517526250.881:43): avc: denied { connect } for pid=7417 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 audit: type=1400 audit(1517526251.064:44): avc: denied { setopt } for pid=7470 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(1517526251.069:45): avc: denied { bind } for pid=7470 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 dccp_close: ABORT with 4294967275 bytes unread netlink: 'syz-executor5': attribute type 1 has an invalid length. netlink: 'syz-executor5': attribute type 1 has an invalid length. audit: type=1400 audit(1517526251.440:46): avc: denied { setopt } for pid=7587 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-executor6': attribute type 3 has an invalid length. netlink: 'syz-executor6': attribute type 3 has an invalid length. dccp_close: ABORT with 260 bytes unread insert transport fail, errno -17 netlink: 4 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 'syz-executor6': attribute type 10 has an invalid length. netlink: 'syz-executor6': attribute type 10 has an invalid length. netlink: 4 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor4'. dccp_invalid_packet: pskb_may_pull failed dccp_invalid_packet: pskb_may_pull failed