====================================================== WARNING: possible circular locking dependency detected 4.16.0-rc1+ #315 Not tainted ------------------------------------------------------ syz-executor4/5638 is trying to acquire lock: (sk_lock-AF_INET6){+.+.}, at: [<00000000143ea25e>] lock_sock include/net/sock.h:1463 [inline] (sk_lock-AF_INET6){+.+.}, at: [<00000000143ea25e>] do_ipv6_setsockopt.isra.8+0x3c5/0x39d0 net/ipv6/ipv6_sockglue.c:167 but task is already holding lock: (rtnl_mutex){+.+.}, at: [<00000000e20c215a>] 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 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+0x97/0xa0 net/ipv4/ip_sockglue.c:1259 raw_setsockopt+0xb7/0xd0 net/ipv4/raw.c:870 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 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #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:1046 xt_request_find_table_lock+0x28/0xc0 net/netfilter/x_tables.c:1093 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 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #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 udpv6_setsockopt+0x45/0x80 net/ipv6/udp.c:1422 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 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 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-executor4/5638: #0: (rtnl_mutex){+.+.}, at: [<00000000e20c215a>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 stack backtrace: CPU: 1 PID: 5638 Comm: syz-executor4 Not tainted 4.16.0-rc1+ #315 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 udpv6_setsockopt+0x45/0x80 net/ipv6/udp.c:1422 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 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453a59 RSP: 002b:00007f4c520b0c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f4c520b16d4 RCX: 0000000000453a59 RDX: 000000000000002a RSI: 0000000000000029 RDI: 0000000000000013 RBP: 000000000071bea0 R08: 0000000000000088 R09: 0000000000000000 R10: 00000000209e7f78 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004fb R14: 00000000006f7828 R15: 0000000000000000 audit: type=1400 audit(1518833735.018:30): avc: denied { create } for pid=5697 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_generic_socket permissive=1 audit: type=1400 audit(1518833735.025:31): avc: denied { write } for pid=5701 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 capability: warning: `syz-executor4' uses deprecated v2 capabilities in a way that may be insecure netlink: 'syz-executor5': attribute type 1 has an invalid length. netlink: 'syz-executor5': attribute type 1 has an invalid length. audit: type=1400 audit(1518833735.297:32): avc: denied { setgid } for pid=5763 comm="syz-executor3" capability=6 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 ipt_CLUSTERIP: no config found for 127.0.0.1, need 'new' ipt_CLUSTERIP: no config found for 127.0.0.1, need 'new' xt_connbytes: Forcing CT accounting to be enabled capability: warning: `syz-executor6' uses 32-bit capabilities (legacy support in use) ipt_CLUSTERIP: Please specify destination IP ipt_CLUSTERIP: Please specify destination IP QAT: Invalid ioctl device eql entered promiscuous mode QAT: Invalid ioctl mmap: syz-executor6 (6075) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt. TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. openvswitch: netlink: Message has 8 unknown bytes. binder: 6174:6177 BC_FREE_BUFFER u0000000000000000 no match binder: 6174:6177 ERROR: BC_REGISTER_LOOPER called without request binder: 6174:6177 ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER binder: 6174:6203 BC_FREE_BUFFER u0000000000000000 no match binder: 6174:6203 ERROR: BC_REGISTER_LOOPER called without request binder: 6174:6203 ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER device eql entered promiscuous mode binder: 6276:6280 not enough space to store 0 fds in buffer irq bypass consumer (token 00000000ca176164) registration fails: -16 binder: 6276:6280 transaction failed 29201/-22, size 72-16 line 3099 binder_alloc: binder_alloc_mmap_handler: 6276 20000000-20002000 already mapped failed -16 binder: BINDER_SET_CONTEXT_MGR already set binder_alloc: 6276: binder_alloc_buf, no vma binder: 6276:6298 transaction failed 29189/-3, size 72-16 line 2957 binder: 6276:6280 ioctl 40046207 0 returned -16 binder: undelivered TRANSACTION_ERROR: 29189 binder: undelivered TRANSACTION_ERROR: 29201 TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. kauditd_printk_skb: 3 callbacks suppressed audit: type=1400 audit(1518833738.187:36): avc: denied { name_bind } for pid=6388 comm="syz-executor4" src=20016 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:port_t:s0 tclass=dccp_socket permissive=1 audit: type=1400 audit(1518833738.188:37): avc: denied { node_bind } for pid=6388 comm="syz-executor4" saddr=::1 src=20016 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:node_t:s0 tclass=dccp_socket permissive=1 audit: type=1400 audit(1518833738.243:38): avc: denied { name_connect } for pid=6388 comm="syz-executor4" dest=20016 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 device bridge0 entered promiscuous mode device bridge0 left promiscuous mode tc_dump_action: action bad kind device bridge0 entered promiscuous mode device bridge0 left promiscuous mode binder: 6613:6621 BC_INCREFS_DONE node 7 has no pending increfs request binder: BINDER_SET_CONTEXT_MGR already set binder: 6613:6621 ioctl 40046207 0 returned -16 QAT: Invalid ioctl QAT: Invalid ioctl audit: type=1400 audit(1518833739.190:39): avc: denied { getopt } for pid=6705 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_generic_socket permissive=1 sctp: [Deprecated]: syz-executor7 (pid 6754) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead audit: type=1400 audit(1518833739.391:40): avc: denied { map_read map_write } for pid=6760 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=bpf permissive=1 rfkill: input handler disabled arp_tables: arp_tables: error: 'îÏ ¡˜™«arY,Gµí>+×t€ó_Ãm ' arp_tables: arp_tables: error: 'îÏ ¡˜™«arY,Gµí>+×t€ó_Ãm ' rfkill: input handler enabled kvm: vcpu 0: requested 68374 ns lapic timer period limited to 500000 ns SELinux: unrecognized netlink message: protocol=6 nlmsg_type=52895 sclass=netlink_xfrm_socket pig=6908 comm=syz-executor3 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=52895 sclass=netlink_xfrm_socket pig=6918 comm=syz-executor3 audit: type=1400 audit(1518833739.966:41): avc: denied { net_bind_service } for pid=1233 comm="kworker/u5:0" capability=10 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=cap_userns permissive=1 xt_CT: netfilter: NOTRACK target is deprecated, use CT instead or upgrade iptables device eql entered promiscuous mode audit: type=1400 audit(1518833740.622:42): avc: denied { create } for pid=7113 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_connector_socket permissive=1 audit: type=1400 audit(1518833740.627:43): avc: denied { getattr } for pid=7116 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=netlink_generic_socket permissive=1 audit: type=1400 audit(1518833740.655:44): avc: denied { write } for pid=7113 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_connector_socket permissive=1 Protocol error: SET target dimension is over the limit! Protocol error: SET target dimension is over the limit! audit: type=1400 audit(1518833741.332:45): avc: denied { bind } for pid=7310 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 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium netlink: 28 bytes leftover after parsing attributes in process `syz-executor0'. QAT: Invalid ioctl netlink: 28 bytes leftover after parsing attributes in process `syz-executor0'. QAT: failed to copy from user cfg_data. QAT: failed to copy from user cfg_data. BUG: sleeping function called from invalid context at mm/slab.h:420 in_atomic(): 1, irqs_disabled(): 0, pid: 7718, name: syz-executor6 INFO: lockdep is turned off. CPU: 1 PID: 7718 Comm: syz-executor6 Not tainted 4.16.0-rc1+ #315 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 ___might_sleep+0x2b2/0x470 kernel/sched/core.c:6133 device eql entered promiscuous mode __might_sleep+0x95/0x190 kernel/sched/core.c:6086 slab_pre_alloc_hook mm/slab.h:420 [inline] slab_alloc mm/slab.c:3365 [inline] kmem_cache_alloc_trace+0x299/0x740 mm/slab.c:3605 kmalloc include/linux/slab.h:512 [inline] kzalloc include/linux/slab.h:701 [inline] rds_loop_conn_alloc+0xc8/0x380 net/rds/loop.c:126 __rds_conn_create+0x112f/0x1b50 net/rds/connection.c:227 rds_conn_create_outgoing+0x3f/0x50 net/rds/connection.c:309 rds_sendmsg+0xda3/0x2390 net/rds/send.c:1126 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg+0xca/0x110 net/socket.c:640 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2046 __sys_sendmsg+0xe5/0x210 net/socket.c:2080 SYSC_sendmsg net/socket.c:2091 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2087 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453a59 RSP: 002b:00007f09bcb9dc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f09bcb9e6d4 RCX: 0000000000453a59 RDX: 0000000000000000 RSI: 000000002000dfc8 RDI: 0000000000000013 RBP: 000000000071bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004b5 R14: 00000000006f7198 R15: 0000000000000000 rdma_op 000000008258c968 conn xmit_rdma (null) openvswitch: netlink: Message has 8 unknown bytes. openvswitch: netlink: Message has 8 unknown bytes. binder: 7775:7777 BC_FREE_BUFFER u0000000000000000 no match binder: 7775:7777 ERROR: BC_REGISTER_LOOPER called without request binder: 7775:7777 ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER binder: 7775:7788 BC_FREE_BUFFER u0000000000000000 no match binder: 7775:7788 ERROR: BC_REGISTER_LOOPER called without request binder: 7775:7788 ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER xt_connbytes: Forcing CT accounting to be enabled kauditd_printk_skb: 5 callbacks suppressed audit: type=1400 audit(1518833743.658:51): avc: denied { setfcap } for pid=7938 comm="syz-executor0" capability=31 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