======================================================
WARNING: possible circular locking dependency detected
4.15.0-rc9+ #212 Not tainted
------------------------------------------------------
syzkaller436466/3676 is trying to acquire lock:
 (rtnl_mutex){+.+.}, at: [<00000000fbb31428>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74

but task is already holding lock:
 (sk_lock-AF_INET){+.+.}, at: [<00000000d6623799>] lock_sock include/net/sock.h:1463 [inline]
 (sk_lock-AF_INET){+.+.}, at: [<00000000d6623799>] ip_setsockopt+0x8c/0xb0 net/ipv4/ip_sockglue.c:1259

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (sk_lock-AF_INET){+.+.}:
       lock_sock_nested+0xc2/0x110 net/core/sock.c:2780
       lock_sock include/net/sock.h:1463 [inline]
       do_ip_setsockopt.isra.12+0x1d9/0x3210 net/ipv4/ip_sockglue.c:646
       ip_setsockopt+0x3a/0xb0 net/ipv4/ip_sockglue.c:1252
       tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2872
       sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978
       SYSC_setsockopt net/socket.c:1849 [inline]
       SyS_setsockopt+0x189/0x360 net/socket.c:1828
       entry_SYSCALL_64_fastpath+0x29/0xa0

-> #0 (rtnl_mutex){+.+.}:
       lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3914
       __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
       register_netdevice_notifier+0xad/0x860 net/core/dev.c:1607
       clusterip_config_init net/ipv4/netfilter/ipt_CLUSTERIP.c:261 [inline]
       clusterip_tg_check+0xeb9/0x1570 net/ipv4/netfilter/ipt_CLUSTERIP.c:478
       xt_check_target+0x22c/0x7d0 net/netfilter/x_tables.c:845
       check_target net/ipv4/netfilter/ip_tables.c:518 [inline]
       find_check_entry.isra.8+0x8c8/0xcb0 net/ipv4/netfilter/ip_tables.c:559
       translate_table+0xed1/0x1610 net/ipv4/netfilter/ip_tables.c:730
       do_replace net/ipv4/netfilter/ip_tables.c:1146 [inline]
       do_ipt_set_ctl+0x370/0x5f0 net/ipv4/netfilter/ip_tables.c:1680
       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:1260
       raw_setsockopt+0xb7/0xd0 net/ipv4/raw.c:870
       sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978
       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:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(sk_lock-AF_INET);
                               lock(rtnl_mutex);
                               lock(sk_lock-AF_INET);
  lock(rtnl_mutex);

 *** DEADLOCK ***

1 lock held by syzkaller436466/3676:
 #0:  (sk_lock-AF_INET){+.+.}, at: [<00000000d6623799>] lock_sock include/net/sock.h:1463 [inline]
 #0:  (sk_lock-AF_INET){+.+.}, at: [<00000000d6623799>] ip_setsockopt+0x8c/0xb0 net/ipv4/ip_sockglue.c:1259

stack backtrace:
CPU: 0 PID: 3676 Comm: syzkaller436466 Not tainted 4.15.0-rc9+ #212
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:1218
 check_prev_add kernel/locking/lockdep.c:1858 [inline]
 check_prevs_add kernel/locking/lockdep.c:1971 [inline]
 validate_chain kernel/locking/lockdep.c:2412 [inline]
 __lock_acquire+0x30a8/0x3e00 kernel/locking/lockdep.c:3426
 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3914
 __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
 register_netdevice_notifier+0xad/0x860 net/core/dev.c:1607
 clusterip_config_init net/ipv4/netfilter/ipt_CLUSTERIP.c:261 [inline]
 clusterip_tg_check+0xeb9/0x1570 net/ipv4/netfilter/ipt_CLUSTERIP.c:478
 xt_check_target+0x22c/0x7d0 net/netfilter/x_tables.c:845
 check_target net/ipv4/netfilter/ip_tables.c:518 [inline]
 find_check_entry.isra.8+0x8c8/0xcb0 net/ipv4/netfilter/ip_tables.c:559
 translate_table+0xed1/0x1610 net/ipv4/netfilter/ip_tables.c:730
 do_replace net/ipv4/netfilter/ip_tables.c:1146 [inline]
 do_ipt_set_ctl+0x370/0x5f0 net/ipv4/netfilter/ip_tables.c:1680
 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:1260
 raw_setsockopt+0xb7/0xd0 net/ipv4/raw.c:870
 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978
 SYSC_setsockopt net/socket.c:1849 [inline]
 SyS_setsockopt+0x189/0x360 net/socket.c:1828
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x445ce9
RSP: 002b:00007fff462044b8 EFLAGS: 00000203 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000445ce9
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007fff462045b8 R08: 0000000000000328 R09: 0000000020005000
R10: 0000000020397cd8 R11: 0000000000000203 R12: 00007fff462045b8
R13: 00000000004031b0 R14: 0000000000000000 R15: 0000000000000000
ipt_CLUSTERIP: ipt_CLUSTERIP is deprecated and it will removed