ipt_CLUSTERIP: ipt_CLUSTERIP is deprecated and it will removed soon, use xt_cluster instead ====================================================== WARNING: possible circular locking dependency detected 4.15.0-rc9+ #284 Not tainted ------------------------------------------------------ syzkaller624657/3690 is trying to acquire lock: (rtnl_mutex){+.+.}, at: [<00000000f8787f89>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72 but task is already holding lock: (&xt[i].mutex){+.+.}, at: [<000000007da872a6>] xt_find_table_lock+0x40/0x3d0 net/netfilter/x_tables.c:1036 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_revision+0xc9/0x2b0 net/netfilter/x_tables.c:367 do_ip6t_get_ctl+0x8e2/0xaf0 net/ipv6/netfilter/ip6_tables.c:1744 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:1378 tcp_getsockopt+0x82/0xd0 net/ipv4/tcp.c:3329 sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2927 SYSC_getsockopt net/socket.c:1862 [inline] SyS_getsockopt+0x178/0x340 net/socket.c:1844 entry_SYSCALL_64_fastpath+0x29/0xa0 -> #1 (sk_lock-AF_INET6){+.+.}: lock_sock_nested+0xc2/0x110 net/core/sock.c:2770 lock_sock include/net/sock.h:1461 [inline] do_ipv6_setsockopt.isra.8+0x3c5/0x39d0 net/ipv6/ipv6_sockglue.c:167 ipv6_setsockopt+0xd7/0x150 net/ipv6/ipv6_sockglue.c:922 sctp_setsockopt+0x2a0/0x5de0 net/sctp/socket.c:4074 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968 SYSC_setsockopt net/socket.c:1831 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1810 entry_SYSCALL_64_fastpath+0x29/0xa0 -> #0 (rtnl_mutex){+.+.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3915 __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:72 unregister_netdevice_notifier+0x91/0x4e0 net/core/dev.c:1656 clusterip_config_entry_put net/ipv4/netfilter/ipt_CLUSTERIP.c:114 [inline] clusterip_tg_destroy+0x389/0x6e0 net/ipv4/netfilter/ipt_CLUSTERIP.c:508 cleanup_entry+0x218/0x350 net/ipv4/netfilter/ip_tables.c:659 __do_replace+0x7d7/0xa90 net/ipv4/netfilter/ip_tables.c:1096 do_replace net/ipv4/netfilter/ip_tables.c:1152 [inline] do_ipt_set_ctl+0x40f/0x5f0 net/ipv4/netfilter/ip_tables.c:1682 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ip_setsockopt+0xa1/0xb0 net/ipv4/ip_sockglue.c:1256 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2875 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968 SYSC_setsockopt net/socket.c:1831 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1810 entry_SYSCALL_64_fastpath+0x29/0xa0 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 *** 2 locks held by syzkaller624657/3690: #0: (sk_lock-AF_INET){+.+.}, at: [<00000000562c484a>] lock_sock include/net/sock.h:1461 [inline] #0: (sk_lock-AF_INET){+.+.}, at: [<00000000562c484a>] ip_setsockopt+0x8c/0xb0 net/ipv4/ip_sockglue.c:1255 #1: (&xt[i].mutex){+.+.}, at: [<000000007da872a6>] xt_find_table_lock+0x40/0x3d0 net/netfilter/x_tables.c:1036 stack backtrace: CPU: 0 PID: 3690 Comm: syzkaller624657 Not tainted 4.15.0-rc9+ #284 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.37+0x2cd/0x2dc kernel/locking/lockdep.c:1219 check_prev_add kernel/locking/lockdep.c:1859 [inline] check_prevs_add kernel/locking/lockdep.c:1972 [inline] validate_chain kernel/locking/lockdep.c:2413 [inline] __lock_acquire+0x30a8/0x3e00 kernel/locking/lockdep.c:3427 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3915 __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:72 unregister_netdevice_notifier+0x91/0x4e0 net/core/dev.c:1656 clusterip_config_entry_put net/ipv4/netfilter/ipt_CLUSTERIP.c:114 [inline] clusterip_tg_destroy+0x389/0x6e0 net/ipv4/netfilter/ipt_CLUSTERIP.c:508 cleanup_entry+0x218/0x350 net/ipv4/netfilter/ip_tables.c:659 __do_replace+0x7d7/0xa90 net/ipv4/netfilter/ip_tables.c:1096 do_replace net/ipv4/netfilter/ip_tables.c:1152 [inline] do_ipt_set_ctl+0x40f/0x5f0 net/ipv4/netfilter/ip_tables.c:1682 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ip_setsockopt+0xa1/0xb0 net/ipv4/ip_sockglue.c:1256 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2875 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968 SYSC_setsockopt net/socket.c:1831 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1810 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x448e9a RSP: 002b:00007ffd38e18718 EFLAGS: 00000206 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00000000006d2100 RCX: 0000000000448e9a RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00000000006d2100 R08: 00000000000002d8 R09: 0000000002486880 R10: 00000000006d2528 R11: 0000000000000206 R12: 0000000000000004 R13: 00000000006d50a8 R14: 00000000006d5050 R15: 00000000004a826c