BUG: sleeping function called from invalid context at net/core/sock.c:2772 in_atomic(): 1, irqs_disabled(): 0, pid: 5224, name: kworker/u4:4 5 locks held by kworker/u4:4/5224: #0: ((wq_completion)"%s""netns"){+.+.}, at: [<00000000b3b47465>] process_one_work+0xaaf/0x1af0 kernel/workqueue.c:2084 #1: (net_cleanup_work){+.+.}, at: [<00000000fd028f71>] process_one_work+0xb01/0x1af0 kernel/workqueue.c:2088 #2: (net_sem){++++}, at: [<000000002db72d50>] cleanup_net+0x23f/0xd20 net/core/net_namespace.c:494 #3: (net_mutex){+.+.}, at: [<000000006337b1df>] cleanup_net+0xa7d/0xd20 net/core/net_namespace.c:496 #4: (&(&srv->idr_lock)->rlock){+...}, at: [<000000004e5b6017>] spin_lock_bh include/linux/spinlock.h:315 [inline] #4: (&(&srv->idr_lock)->rlock){+...}, at: [<000000004e5b6017>] tipc_topsrv_stop+0x231/0x610 net/tipc/topsrv.c:685 CPU: 0 PID: 5224 Comm: kworker/u4:4 Not tainted 4.16.0-rc1+ #232 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net 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:6128 __might_sleep+0x95/0x190 kernel/sched/core.c:6081 lock_sock_nested+0x37/0x110 net/core/sock.c:2772 lock_sock include/net/sock.h:1463 [inline] tipc_release+0x103/0xff0 net/tipc/socket.c:572 sock_release+0x8d/0x1e0 net/socket.c:594 tipc_topsrv_stop+0x3c0/0x610 net/tipc/topsrv.c:696 tipc_exit_net+0x15/0x40 net/tipc/core.c:96 ops_exit_list.isra.6+0xae/0x150 net/core/net_namespace.c:148 cleanup_net+0x6ba/0xd20 net/core/net_namespace.c:529 process_one_work+0xbbf/0x1af0 kernel/workqueue.c:2113 worker_thread+0x223/0x1990 kernel/workqueue.c:2247 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:429 xt_connbytes: Forcing CT accounting to be enabled netlink: 'syz-executor6': attribute type 1 has an invalid length. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=23536 sclass=netlink_route_socket pig=5791 comm=syz-executor1 netlink: 'syz-executor6': attribute type 1 has an invalid length. can: request_module (can-proto-4) failed. can: request_module (can-proto-4) failed. netlink: 'syz-executor3': attribute type 1 has an invalid length. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=43 sclass=netlink_route_socket pig=6076 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=43 sclass=netlink_route_socket pig=6100 comm=syz-executor5 TCP: request_sock_TCP: Possible SYN flooding on port 20014. Sending cookies. Check SNMP counters. netlink: 'syz-executor5': attribute type 21 has an invalid length. ====================================================== WARNING: possible circular locking dependency detected 4.16.0-rc1+ #232 Tainted: G W ------------------------------------------------------ syz-executor3/6373 is trying to acquire lock: (rtnl_mutex){+.+.}, at: [<00000000e64efa21>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 but task is already holding lock: (&xt[i].mutex){+.+.}, at: [<000000004889f7dd>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1046 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&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:2938 SYSC_getsockopt net/socket.c:1881 [inline] SyS_getsockopt+0x178/0x340 net/socket.c:1863 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x26/0x9b -> #1 (sk_lock-AF_INET6){+.+.}: lock_sock_nested+0xc2/0x110 net/core/sock.c:2781 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 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2979 SYSC_setsockopt net/socket.c:1850 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1829 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x26/0x9b -> #0 (rtnl_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 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:1261 udp_setsockopt+0x45/0x80 net/ipv4/udp.c:2401 ipv6_setsockopt+0xa0/0x130 net/ipv6/ipv6_sockglue.c:917 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2979 SYSC_setsockopt net/socket.c:1850 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1829 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x26/0x9b other info that might help us debug this: Chain exists of: rtnl_mutex --> sk_lock-AF_INET6 --> &xt[i].mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&xt[i].mutex); lock(sk_lock-AF_INET6); lock(&xt[i].mutex); lock(rtnl_mutex); *** DEADLOCK *** 1 lock held by syz-executor3/6373: #0: (&xt[i].mutex){+.+.}, at: [<000000004889f7dd>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1046 stack backtrace: CPU: 0 PID: 6373 Comm: syz-executor3 Tainted: G W 4.16.0-rc1+ #232 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 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:1261 udp_setsockopt+0x45/0x80 net/ipv4/udp.c:2401 ipv6_setsockopt+0xa0/0x130 net/ipv6/ipv6_sockglue.c:917 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2979 SYSC_setsockopt net/socket.c:1850 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1829 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x26/0x9b RIP: 0033:0x453da9 RSP: 002b:00007f41083cfc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f41083d06d4 RCX: 0000000000453da9 RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000016 RBP: 000000000072bea0 R08: 0000000000000338 R09: 0000000000000000 R10: 0000000020008000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004d6 R14: 00000000006f74b0 R15: 0000000000000000 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=42 sclass=netlink_tcpdiag_socket pig=6403 comm=syz-executor6 BUG: sleeping function called from invalid context at net/core/sock.c:2772 in_atomic(): 1, irqs_disabled(): 0, pid: 5224, name: kworker/u4:4 INFO: lockdep is turned off. CPU: 0 PID: 5224 Comm: kworker/u4:4 Tainted: G W 4.16.0-rc1+ #232 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net 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:6128 __might_sleep+0x95/0x190 kernel/sched/core.c:6081 lock_sock_nested+0x37/0x110 net/core/sock.c:2772 lock_sock include/net/sock.h:1463 [inline] tipc_release+0x103/0xff0 net/tipc/socket.c:572 sock_release+0x8d/0x1e0 net/socket.c:594 tipc_topsrv_stop+0x3c0/0x610 net/tipc/topsrv.c:696 tipc_exit_net+0x15/0x40 net/tipc/core.c:96 ops_exit_list.isra.6+0xae/0x150 net/core/net_namespace.c:148 cleanup_net+0x6ba/0xd20 net/core/net_namespace.c:529 process_one_work+0xbbf/0x1af0 kernel/workqueue.c:2113 worker_thread+0x223/0x1990 kernel/workqueue.c:2247 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:429 kauditd_printk_skb: 24 callbacks suppressed audit: type=1400 audit(1519098734.868:46): avc: denied { accept } for pid=6464 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 xt_CT: netfilter: NOTRACK target is deprecated, use CT instead or upgrade iptables sock: process `syz-executor7' is using obsolete getsockopt SO_BSDCOMPAT netlink: 'syz-executor5': attribute type 1 has an invalid length. audit: type=1400 audit(1519098735.496:47): avc: denied { ioctl } for pid=6690 comm="syz-executor4" path="socket:[17889]" dev="sockfs" ino=17889 ioctlcmd=0x8935 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(1519098735.552:48): avc: denied { net_bind_service } for pid=6708 comm="syz-executor4" capability=10 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 netlink: 'syz-executor1': attribute type 29 has an invalid length. netlink: 8 bytes leftover after parsing attributes in process `syz-executor1'. audit: type=1400 audit(1519098735.930:49): avc: denied { relabelto } for pid=6880 comm="syz-executor1" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:sulogin_exec_t:s0 tclass=packet permissive=1 dccp_invalid_packet: P.Data Offset(0) too small audit: type=1400 audit(1519098735.937:50): avc: denied { relabelto } for pid=6880 comm="syz-executor1" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:inetd_exec_t:s0 tclass=packet permissive=1 netlink: 'syz-executor3': attribute type 1 has an invalid length. Bearer <> rejected, not supported in standalone mode Bearer <> rejected, not supported in standalone mode netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 'syz-executor4': attribute type 5 has an invalid length. netlink: 'syz-executor4': attribute type 5 has an invalid length. netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. sctp: [Deprecated]: syz-executor4 (pid 7236) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor4 (pid 7245) Use of int in maxseg socket option. Use struct sctp_assoc_value instead netlink: 8 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor6'. audit: type=1400 audit(1519098737.041:51): avc: denied { bind } for pid=7323 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(1519098737.167:52): avc: denied { read } for pid=7409 comm="syz-executor3" path="socket:[18810]" dev="sockfs" ino=18810 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: 3404 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 3404 bytes leftover after parsing attributes in process `syz-executor2'. BUG: sleeping function called from invalid context at mm/slab.h:420 in_atomic(): 1, irqs_disabled(): 0, pid: 7793, name: syz-executor2 INFO: lockdep is turned off. CPU: 0 PID: 7793 Comm: syz-executor2 Tainted: G W 4.16.0-rc1+ #232 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:6128 __might_sleep+0x95/0x190 kernel/sched/core.c:6081 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+0xe63/0x2550 net/rds/send.c:1153 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg+0xca/0x110 net/socket.c:639 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2047 __sys_sendmsg+0xe5/0x210 net/socket.c:2081 SYSC_sendmsg net/socket.c:2092 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2088 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x26/0x9b RIP: 0033:0x453da9 RSP: 002b:00007f0f8445dc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f0f8445e6d4 RCX: 0000000000453da9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004a6 R14: 00000000006f7030 R15: 0000000000000000 sock: sock_set_timeout: `syz-executor6' (pid 7845) tries to set negative timeout sock: sock_set_timeout: `syz-executor6' (pid 7845) tries to set negative timeout x_tables: ip_tables: ah match: only valid for protocol 51 netlink: 'syz-executor4': attribute type 21 has an invalid length. netlink: 'syz-executor4': attribute type 21 has an invalid length. x_tables: ip_tables: ah match: only valid for protocol 51 kernel msg: ebtables bug: please report to author: Total nentries is wrong kernel msg: ebtables bug: please report to author: Total nentries is wrong xt_CT: No such timeout policy "syz1" Cannot find set identified by id 6 to match xt_CT: No such timeout policy "syz1" Cannot find set identified by id 6 to match device syz3 entered promiscuous mode device syz3 left promiscuous mode SELinux: unrecognized netlink message: protocol=0 nlmsg_type=41344 sclass=netlink_route_socket pig=8361 comm=syz-executor7 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=41344 sclass=netlink_route_socket pig=8374 comm=syz-executor7 xt_CT: No such helper "pptp" xt_CT: No such helper "pptp" dst_release: dst:00000000820d997a refcnt:-1 x_tables: ip6_tables: SNAT target: used from hooks PREROUTING/OUTPUT/POSTROUTING, but only usable from INPUT/POSTROUTING x_tables: ip6_tables: SNAT target: used from hooks PREROUTING/OUTPUT/POSTROUTING, but only usable from INPUT/POSTROUTING sock: process `syz-executor3' is using obsolete setsockopt SO_BSDCOMPAT netlink: 'syz-executor6': attribute type 13 has an invalid length. netlink: 'syz-executor6': attribute type 13 has an invalid length. device bridge0 entered promiscuous mode device bridge0 left promiscuous mode sctp: [Deprecated]: syz-executor6 (pid 8640) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor6 (pid 8652) Use of int in maxseg socket option. Use struct sctp_assoc_value instead