====================================================== WARNING: possible circular locking dependency detected 4.15.0+ #221 Not tainted ------------------------------------------------------ syz-executor3/5376 is trying to acquire lock: (sk_lock-AF_INET){+.+.}, at: [<00000000b748cce3>] lock_sock include/net/sock.h:1463 [inline] (sk_lock-AF_INET){+.+.}, at: [<00000000b748cce3>] do_ip_setsockopt.isra.12+0x1d9/0x3210 net/ipv4/ip_sockglue.c:646 but task is already holding lock: (rtnl_mutex){+.+.}, at: [<000000006f79c157>] 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 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 -> #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 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 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-executor3/5376: #0: (rtnl_mutex){+.+.}, at: [<000000006f79c157>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 stack backtrace: CPU: 0 PID: 5376 Comm: syz-executor3 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 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 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x453299 RSP: 002b:00007f353a38bc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299 RDX: 0000000000000030 RSI: 0000000000000000 RDI: 0000000000000013 RBP: 00000000000005c9 R08: 00000000000004d8 R09: 0000000000000000 R10: 0000000020fbfb28 R11: 0000000000000212 R12: 00000000006f7b78 R13: 00000000ffffffff R14: 00007f353a38c6d4 R15: 0000000000000000 netlink: 'syz-executor3': attribute type 3 has an invalid length. netlink: 'syz-executor3': attribute type 3 has an invalid length. netlink: 'syz-executor6': attribute type 1 has an invalid length. sctp: [Deprecated]: syz-executor5 (pid 5581) Use of int in max_burst socket option. Use struct sctp_assoc_value instead netlink: 'syz-executor6': attribute type 1 has an invalid length. sctp: [Deprecated]: syz-executor5 (pid 5607) Use of int in max_burst socket option. Use struct sctp_assoc_value instead TCP: request_sock_TCPv6: Possible SYN flooding on port 20006. Sending cookies. Check SNMP counters. netlink: 'syz-executor6': attribute type 3 has an invalid length. netlink: 'syz-executor6': attribute type 3 has an invalid length. sctp: [Deprecated]: syz-executor5 (pid 5875) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor5 (pid 5875) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor5 (pid 5885) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor5 (pid 5875) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead netlink: 28 bytes leftover after parsing attributes in process `syz-executor6'. SELinux: unrecognized netlink message: protocol=6 nlmsg_type=56449 sclass=netlink_xfrm_socket pig=5946 comm=syz-executor3 netlink: 28 bytes leftover after parsing attributes in process `syz-executor6'. SELinux: unrecognized netlink message: protocol=6 nlmsg_type=56449 sclass=netlink_xfrm_socket pig=5967 comm=syz-executor3 netlink: 128 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 128 bytes leftover after parsing attributes in process `syz-executor5'. sctp: [Deprecated]: syz-executor0 (pid 6105) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead xt_CT: You must specify a L4 protocol, and not use inversions on it. sctp: [Deprecated]: syz-executor0 (pid 6105) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead xt_CT: You must specify a L4 protocol, and not use inversions on it. netlink: 11 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor0'. 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 IPv4: Oversized IP packet from 127.0.0.1 xt_cgroup: both path and classid specified xt_cgroup: both path and classid specified netlink: 8 bytes leftover after parsing attributes in process `syz-executor3'. IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready RDS: rds_bind could not find a transport for 224.0.0.1, load rds_tcp or rds_rdma? syz5: Invalid MTU -2 requested, hw min 68 sctp: [Deprecated]: syz-executor2 (pid 7037) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor2 (pid 7048) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead netlink: 3 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor7'. kauditd_printk_skb: 21 callbacks suppressed audit: type=1400 audit(1517938138.433:43): avc: denied { setopt } for pid=7083 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(1517938138.440:44): avc: denied { read } for pid=7083 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 sctp: [Deprecated]: syz-executor6 (pid 7127) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor6 (pid 7127) Use of int in maxseg socket option. Use struct sctp_assoc_value instead audit: type=1400 audit(1517938138.610:45): avc: denied { read } for pid=7148 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 audit: type=1400 audit(1517938138.861:46): avc: denied { ioctl } for pid=7262 comm="syz-executor6" path="socket:[17428]" dev="sockfs" ino=17428 ioctlcmd=0x8947 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 tc_dump_action: action bad kind tc_dump_action: action bad kind ieee80211 phy2: Selected rate control algorithm 'minstrel_ht' device syz6 entered promiscuous mode ieee80211 phy3: Selected rate control algorithm 'minstrel_ht' device syz6 left promiscuous mode Cannot find add_set index 0 as target Cannot find add_set index 0 as target sctp: [Deprecated]: syz-executor3 (pid 7628) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor3 (pid 7642) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead SELinux: unrecognized netlink message: protocol=6 nlmsg_type=78 sclass=netlink_xfrm_socket pig=7675 comm=syz-executor1 nla_parse: 6 callbacks suppressed netlink: 2 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 'syz-executor4': attribute type 21 has an invalid length. netlink: 'syz-executor4': attribute type 5 has an invalid length. netlink: 'syz-executor4': attribute type 21 has an invalid length. netlink: 'syz-executor4': attribute type 5 has an invalid length. netlink: 2 bytes leftover after parsing attributes in process `syz-executor7'. audit: type=1400 audit(1517938140.915:47): avc: denied { map } for pid=8017 comm="syz-executor4" path="socket:[18841]" dev="sockfs" ino=18841 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=dccp_socket permissive=1 audit: type=1400 audit(1517938141.032:48): avc: denied { map } for pid=8060 comm="syz-executor1" path="socket:[18874]" dev="sockfs" ino=18874 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_socket: unknown flags 0xf8 xt_socket: unknown flags 0xf8 sctp: [Deprecated]: syz-executor7 (pid 8158) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor7 (pid 8158) Use of int in maxseg socket option. Use struct sctp_assoc_value instead FAULT_INJECTION: forcing a failure. name fail_page_alloc, interval 1, probability 0, space 0, times 1 CPU: 0 PID: 8208 Comm: syz-executor6 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 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x8c0/0xa40 lib/fault-inject.c:149 should_fail_alloc_page mm/page_alloc.c:2955 [inline] prepare_alloc_pages mm/page_alloc.c:4194 [inline] __alloc_pages_nodemask+0x338/0xd80 mm/page_alloc.c:4233 alloc_pages_current+0xb6/0x1e0 mm/mempolicy.c:2055 alloc_pages include/linux/gfp.h:492 [inline] skb_page_frag_refill+0x358/0x5f0 net/core/sock.c:2208 tun_build_skb.isra.50+0x2f0/0x1810 drivers/net/tun.c:1630 tun_get_user+0x17d0/0x3940 drivers/net/tun.c:1800 tun_chr_write_iter+0xb9/0x160 drivers/net/tun.c:1986 call_write_iter include/linux/fs.h:1781 [inline] do_iter_readv_writev+0x55c/0x830 fs/read_write.c:653 do_iter_write+0x154/0x540 fs/read_write.c:932 vfs_writev+0x18a/0x340 fs/read_write.c:977 do_writev+0xfc/0x2a0 fs/read_write.c:1012 SYSC_writev fs/read_write.c:1085 [inline] SyS_writev+0x27/0x30 fs/read_write.c:1082 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x453171 RSP: 002b:00007f37888d6b80 EFLAGS: 00000293 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007f37888d6aa0 RCX: 0000000000453171 RDX: 0000000000000001 RSI: 00007f37888d6bd0 RDI: 0000000000000012 RBP: 00007f37888d6a90 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000006e R11: 0000000000000293 R12: 00000000004b8096 R13: 00007f37888d6bc8 R14: 00000000004b8096 R15: 0000000000000000 netlink: 7 bytes leftover after parsing attributes in process `syz-executor7'. PF_BRIDGE: br_mdb_parse() with invalid ifindex netlink: 'syz-executor0': attribute type 4 has an invalid length. netlink: 7 bytes leftover after parsing attributes in process `syz-executor7'. PF_BRIDGE: br_mdb_parse() with invalid ifindex netlink: 'syz-executor1': attribute type 21 has an invalid length. netlink: 'syz-executor1': attribute type 4 has an invalid length. netlink: 'syz-executor0': attribute type 4 has an invalid length. netlink: 'syz-executor1': attribute type 21 has an invalid length. netlink: 'syz-executor1': attribute type 4 has an invalid length. ieee80211 phy4: Selected rate control algorithm 'minstrel_ht' ieee80211 phy5: Selected rate control algorithm 'minstrel_ht' IPVS: set_ctl: invalid protocol: 13703 39.52.93.236:60696 Ɓtpm`x/.HݼބDBC+ syz-executor7 (8515) used greatest stack depth: 15648 bytes left audit: type=1400 audit(1517938143.320:49): avc: denied { setopt } for pid=8859 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 netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'. FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 1 CPU: 0 PID: 8929 Comm: syz-executor5 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 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x8c0/0xa40 lib/fault-inject.c:149 should_failslab+0xec/0x120 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:422 [inline] slab_alloc mm/slab.c:3365 [inline] kmem_cache_alloc+0x47/0x760 mm/slab.c:3539 dst_alloc+0x11f/0x1a0 net/core/dst.c:104 rt_dst_alloc+0xe9/0x520 net/ipv4/route.c:1497 __mkroute_output net/ipv4/route.c:2239 [inline] ip_route_output_key_hash_rcu+0xa59/0x2f00 net/ipv4/route.c:2467