====================================================== WARNING: possible circular locking dependency detected 4.15.0+ #221 Not tainted ------------------------------------------------------ syz-executor7/7780 is trying to acquire lock: (&xt[i].mutex){+.+.}, at: [<0000000087db55af>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1041 but task is already holding lock: (sk_lock-AF_INET6){+.+.}, at: [<000000007307517b>] lock_sock include/net/sock.h:1463 [inline] (sk_lock-AF_INET6){+.+.}, at: [<000000007307517b>] ip_getsockopt+0x143/0x220 net/ipv4/ip_sockglue.c:1570 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: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 sctp_setsockopt+0x2b6/0x61d0 net/sctp/socket.c:4104 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 (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 -> #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_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_arpt_get_ctl+0x2a9/0xa00 net/ipv4/netfilter/arp_tables.c:1481 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 udp_getsockopt+0x45/0x80 net/ipv4/udp.c:2473 ipv6_getsockopt+0xf3/0x2e0 net/ipv6/ipv6_sockglue.c:1356 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 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-executor7/7780: #0: (sk_lock-AF_INET6){+.+.}, at: [<000000007307517b>] lock_sock include/net/sock.h:1463 [inline] #0: (sk_lock-AF_INET6){+.+.}, at: [<000000007307517b>] ip_getsockopt+0x143/0x220 net/ipv4/ip_sockglue.c:1570 stack backtrace: CPU: 1 PID: 7780 Comm: syz-executor7 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 __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_arpt_get_ctl+0x2a9/0xa00 net/ipv4/netfilter/arp_tables.c:1481 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 udp_getsockopt+0x45/0x80 net/ipv4/udp.c:2473 ipv6_getsockopt+0xf3/0x2e0 net/ipv6/ipv6_sockglue.c:1356 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 RIP: 0033:0x453299 RSP: 002b:00007f99eb666c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299 RDX: 0000000000000060 RSI: 0000000000000000 RDI: 0000000000000013 RBP: 00000000000005ca R08: 0000000020d23000 R09: 0000000000000000 R10: 00000000201e3000 R11: 0000000000000212 R12: 00000000006f7b90 R13: 00000000ffffffff R14: 00007f99eb6676d4 R15: 0000000000000000 audit: type=1400 audit(1517927393.005:26): avc: denied { read } for pid=8299 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_netfilter_socket permissive=1 audit: type=1400 audit(1517927393.006:27): avc: denied { net_bind_service } for pid=8303 comm="syz-executor3" 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 audit: type=1400 audit(1517927393.633:28): avc: denied { read } for pid=8590 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_generic_socket permissive=1 netlink: 16 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor7'. ieee80211 phy2: Selected rate control algorithm 'minstrel_ht' netlink: 4 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor6'. ieee80211 phy3: Selected rate control algorithm 'minstrel_ht' netlink: 16 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor7'. ieee80211 phy4: Selected rate control algorithm 'minstrel_ht' netlink: 16 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor6'. ieee80211 phy5: Selected rate control algorithm 'minstrel_ht' ieee80211 phy6: Selected rate control algorithm 'minstrel_ht' audit: type=1400 audit(1517927394.073:29): avc: denied { map } for pid=8727 comm="syz-executor2" path=2F616E6F6E5F6875676570616765202864656C6574656429 dev="hugetlbfs" ino=20504 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:hugetlbfs_t:s0 tclass=file permissive=1 ieee80211 phy7: Selected rate control algorithm 'minstrel_ht' ieee80211 phy8: Selected rate control algorithm 'minstrel_ht' ieee80211 phy9: Selected rate control algorithm 'minstrel_ht' syz-executor3 uses obsolete (PF_INET,SOCK_PACKET) netlink: 'syz-executor6': attribute type 21 has an invalid length. netlink: 'syz-executor6': attribute type 21 has an invalid length. A link change request failed with some changes committed already. Interface lo may have been left with an inconsistent configuration, please check. A link change request failed with some changes committed already. Interface lo may have been left with an inconsistent configuration, please check. netlink: 'syz-executor6': attribute type 21 has an invalid length. netlink: 'syz-executor6': attribute type 21 has an invalid length. A link change request failed with some changes committed already. Interface lo may have been left with an inconsistent configuration, please check. netlink: 'syz-executor6': attribute type 21 has an invalid length. A link change request failed with some changes committed already. Interface lo may have been left with an inconsistent configuration, please check. audit: type=1400 audit(1517927395.653:30): avc: denied { map_read } for pid=9277 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=bpf permissive=1 A link change request failed with some changes committed already. Interface lo may have been left with an inconsistent configuration, please check. xt_cgroup: no path or classid specified xt_cgroup: no path or classid specified xt_cgroup: no path or classid specified xt_cgroup: no path or classid specified xt_cgroup: no path or classid specified sctp: [Deprecated]: syz-executor6 (pid 9629) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor6 (pid 9629) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor6 (pid 9684) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor6 (pid 9735) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor2 (pid 9749) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor5 (pid 9754) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor6 (pid 9804) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor2 (pid 9805) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor5 (pid 9819) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor5 (pid 9872) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead netlink: 'syz-executor5': attribute type 3 has an invalid length. netlink: 'syz-executor5': attribute type 3 has an invalid length. netlink: 'syz-executor5': attribute type 3 has an invalid length. netlink: 'syz-executor5': attribute type 3 has an invalid length. netlink: 'syz-executor5': attribute type 3 has an invalid length. netlink: 'syz-executor1': attribute type 21 has an invalid length. netlink: 'syz-executor1': attribute type 21 has an invalid length. netlink: 'syz-executor1': attribute type 21 has an invalid length. netlink: 'syz-executor1': attribute type 21 has an invalid length. Cannot find add_set index 0 as target Cannot find add_set index 0 as target xt_limit: Overflow, try lower: 4294967293/4294962286 Cannot find add_set index 0 as target xt_limit: Overflow, try lower: 4294967293/4294962286 Cannot find add_set index 0 as target xt_limit: Overflow, try lower: 4294967293/4294962286 Cannot find add_set index 0 as target xt_limit: Overflow, try lower: 4294967293/4294962286 xt_limit: Overflow, try lower: 4294967293/4294962286 audit: type=1400 audit(1517927399.120:31): avc: denied { write } for pid=10702 comm="syz-executor2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:unlabeled_t:s0 tclass=socket permissive=1 xt_recent: Unsupported user space flags (00000071) audit: type=1400 audit(1517927399.123:32): avc: denied { read } for pid=10702 comm="syz-executor2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:unlabeled_t:s0 tclass=socket permissive=1 xt_recent: Unsupported user space flags (00000071) xt_recent: Unsupported user space flags (00000071) xt_recent: Unsupported user space flags (00000071) xt_recent: Unsupported user space flags (00000071) audit: type=1400 audit(1517927399.448:33): avc: denied { bind } for pid=10801 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 validate_nla: 3 callbacks suppressed netlink: 'syz-executor3': attribute type 1 has an invalid length. netlink: 'syz-executor3': attribute type 1 has an invalid length. netlink: 'syz-executor1': attribute type 1 has an invalid length. xt_l2tp: missing protocol rule (udp|l2tpip) netlink: 'syz-executor3': attribute type 1 has an invalid length. netlink: 'syz-executor1': attribute type 1 has an invalid length. Cannot find add_set index 0 as target netlink: 'syz-executor1': attribute type 1 has an invalid length. xt_l2tp: missing protocol rule (udp|l2tpip) Cannot find add_set index 0 as target xt_l2tp: missing protocol rule (udp|l2tpip) xt_l2tp: missing protocol rule (udp|l2tpip) Cannot find add_set index 0 as target