====================================================== WARNING: possible circular locking dependency detected 4.15.0-rc9+ #215 Not tainted ------------------------------------------------------ syzkaller216849/4157 is trying to acquire lock: (rtnl_mutex){+.+.}, at: [<00000000118ff72b>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 but task is already holding lock: (sk_lock-AF_INET){+.+.}, at: [<0000000021019b22>] lock_sock include/net/sock.h:1463 [inline] (sk_lock-AF_INET){+.+.}, at: [<0000000021019b22>] 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_getsockopt+0x1b3/0x2170 net/ipv4/ip_sockglue.c:1335 ip_getsockopt+0x90/0x220 net/ipv4/ip_sockglue.c:1566 udp_getsockopt+0x45/0x80 net/ipv4/udp.c:2473 sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2937 SYSC_getsockopt net/socket.c:1880 [inline] SyS_getsockopt+0x178/0x340 net/socket.c:1862 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 syzkaller216849/4157: #0: (sk_lock-AF_INET){+.+.}, at: [<0000000021019b22>] lock_sock include/net/sock.h:1463 [inline] #0: (sk_lock-AF_INET){+.+.}, at: [<0000000021019b22>] ip_setsockopt+0x8c/0xb0 net/ipv4/ip_sockglue.c:1259 stack backtrace: CPU: 0 PID: 4157 Comm: syzkaller216849 Not tainted 4.15.0-rc9+ #215 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: 0033:0x445cf9 RSP: 002b:00007ffd8ad62a18 EFLAGS: 00000203 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00000000004a75b2 RCX: 0000000000445cf9 RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007ffd8ad62b18 R08: 00000000000002f8 R09: 00000000207a6f2e R10: 000000002000b000 R11: 0000000000000203 R12: 00007ffd8ad62b18 R13: 00000000004031c0 R14: 0000000000000000 R15: 0000000000000000 ipt_CLUSTERIP: ipt_CLUSTERIP is deprecated and it will removed soon