xt_hashlimit: overflow, try lower: 0/0 ====================================================== WARNING: possible circular locking dependency detected 4.15.0+ #221 Not tainted ------------------------------------------------------ syz-executor0/5918 is trying to acquire lock: (sk_lock-AF_INET){+.+.} xt_hashlimit: overflow, try lower: 0/0 , at: [<00000000d2875dd0>] lock_sock include/net/sock.h:1463 [inline] , at: [<00000000d2875dd0>] do_ip_setsockopt.isra.12+0x1d9/0x3210 net/ipv4/ip_sockglue.c:646 but task is already holding lock: (rtnl_mutex){+.+.}, at: [<000000007a502b3f>] 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 netlink: 'syz-executor4': attribute type 3 has an invalid length. 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 netlink: 'syz-executor4': attribute type 3 has an invalid length. -> #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_ipt_get_ctl+0x159/0xac0 net/ipv4/netfilter/ip_tables.c:1699 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] nf_getsockopt+0x6a/0xc0 net/netfilter/nf_sockopt.c:122 ip_getsockopt+0x15c/0x220 net/ipv4/ip_sockglue.c:1571 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_INET){+.+.}: 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_ip_setsockopt.isra.12+0x1d9/0x3210 net/ipv4/ip_sockglue.c:646 ip_setsockopt+0x3a/0xa0 net/ipv4/ip_sockglue.c:1252 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: sk_lock-AF_INET --> &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_INET); *** DEADLOCK *** 1 lock held by syz-executor0/5918: #0: (rtnl_mutex){+.+.}, at: [<000000007a502b3f>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 stack backtrace: CPU: 1 PID: 5918 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 lock_sock_nested+0xc2/0x110 net/core/sock.c:2777 lock_sock include/net/sock.h:1463 [inline] do_ip_setsockopt.isra.12+0x1d9/0x3210 net/ipv4/ip_sockglue.c:646 ip_setsockopt+0x3a/0xa0 net/ipv4/ip_sockglue.c:1252 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: 0033:0x453299 RSP: 002b:00007f4f5d2fac58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299 RDX: 8000000000000027 RSI: 0000000000000000 RDI: 0000000000000013 RBP: 000000000000000b R08: 000000000000000c R09: 0000000000000000 R10: 0000000020672000 R11: 0000000000000212 R12: 00000000006ef1a8 R13: 00000000ffffffff R14: 00007f4f5d2fb6d4 R15: 0000000000000000 device lo entered promiscuous mode netlink: 'syz-executor0': attribute type 21 has an invalid length. netlink: 'syz-executor0': attribute type 21 has an invalid length. netlink: 'syz-executor2': attribute type 21 has an invalid length. netlink: 4 bytes leftover after parsing attributes in process `syz-executor2'. xt_socket: unknown flags 0xec SELinux: unrecognized netlink message: protocol=4 nlmsg_type=24 sclass=netlink_tcpdiag_socket pig=6417 comm=syz-executor1 xt_socket: unknown flags 0xec netlink: 'syz-executor7': attribute type 3 has an invalid length. netlink: 'syz-executor7': attribute type 3 has an invalid length. netlink: 17 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 'syz-executor1': attribute type 11 has an invalid length. Cannot find add_set index 0 as target xt_CT: You must specify a L4 protocol, and not use inversions on it. Cannot find add_set index 0 as target xt_CT: You must specify a L4 protocol, and not use inversions on it. openvswitch: netlink: Flow set message rejected, Key attribute missing. openvswitch: netlink: Flow set message rejected, Key attribute missing. kauditd_printk_skb: 25 callbacks suppressed audit: type=1400 audit(1517905471.077:47): avc: denied { ioctl } for pid=6926 comm="syz-executor6" path="socket:[16593]" dev="sockfs" ino=16593 ioctlcmd=0x8941 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 xt_policy: neither incoming nor outgoing policy selected xt_policy: neither incoming nor outgoing policy selected xt_l2tp: missing protocol rule (udp|l2tpip) xt_l2tp: missing protocol rule (udp|l2tpip) audit: type=1400 audit(1517905471.796:48): avc: denied { map } for pid=7229 comm="syz-executor4" path="socket:[16813]" dev="sockfs" ino=16813 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=packet_socket permissive=1 IPv4: Oversized IP packet from 127.0.0.1 audit: type=1400 audit(1517905475.428:49): avc: denied { net_broadcast } for pid=7320 comm="syz-executor3" 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 audit: type=1400 audit(1517905475.635:50): avc: denied { create } for pid=7401 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_fib_lookup_socket permissive=1 netlink: 4084 bytes leftover after parsing attributes in process `syz-executor0'. openvswitch: netlink: Message has 8 unknown bytes. netlink: 4084 bytes leftover after parsing attributes in process `syz-executor0'. openvswitch: netlink: Message has 8 unknown bytes. syz-executor7 (7656) used greatest stack depth: 13760 bytes left validate_nla: 3 callbacks suppressed netlink: 'syz-executor1': attribute type 16 has an invalid length. netlink: 27 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 'syz-executor1': attribute type 16 has an invalid length. netlink: 27 bytes leftover after parsing attributes in process `syz-executor7'. audit: type=1400 audit(1517905476.528:51): avc: denied { accept } for pid=7754 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_fib_lookup_socket permissive=1 Cannot find set identified by id 47258 to match audit: type=1400 audit(1517905476.529:52): avc: denied { write } for pid=7754 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_fib_lookup_socket permissive=1 TCP: request_sock_TCPv6: Possible SYN flooding on port 20026. Sending cookies. Check SNMP counters. 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 xt_HMARK: proto mask must be zero with L3 mode xt_HMARK: proto mask must be zero with L3 mode netlink: 'syz-executor7': attribute type 21 has an invalid length. netlink: 'syz-executor7': attribute type 1 has an invalid length. netlink: 'syz-executor7': attribute type 21 has an invalid length. netlink: 'syz-executor7': attribute type 1 has an invalid length. audit: type=1400 audit(1517905477.571:53): avc: denied { create } for pid=8131 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_connector_socket permissive=1 audit: type=1400 audit(1517905477.572:54): avc: denied { ioctl } for pid=8131 comm="syz-executor2" path="socket:[18516]" dev="sockfs" ino=18516 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_connector_socket permissive=1 audit: type=1400 audit(1517905477.596:55): avc: denied { write } for pid=8131 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_connector_socket permissive=1 audit: type=1400 audit(1517905477.842:56): avc: denied { getopt } for pid=8229 comm="syz-executor6" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:unlabeled_t:s0 tclass=socket permissive=1