ip6_tables: ip6tables: counters copy to user failed while replacing table ====================================================== WARNING: possible circular locking dependency detected 4.14.258-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor027/7985 is trying to acquire lock: (rtnl_mutex){+.+.}, at: [] unregister_netdevice_notifier+0x5e/0x2b0 net/core/dev.c:1630 net/core/dev.c:1630 but task is already holding lock: (&xt[i].mutex){+.+.}, at: [] xt_find_table_lock+0x38/0x3d0 net/netfilter/x_tables.c:1088 net/netfilter/x_tables.c:1088 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_common kernel/locking/mutex.c:756 [inline] kernel/locking/mutex.c:893 __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 kernel/locking/mutex.c:893 match_revfn+0x43/0x210 net/netfilter/x_tables.c:332 net/netfilter/x_tables.c:332 xt_find_revision+0x8d/0x1d0 net/netfilter/x_tables.c:380 net/netfilter/x_tables.c:380 nfnl_compat_get+0x1f7/0x870 net/netfilter/nft_compat.c:678 net/netfilter/nft_compat.c:678 nfnetlink_rcv_msg+0x9bb/0xc00 net/netfilter/nfnetlink.c:214 net/netfilter/nfnetlink.c:214 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2441 net/netlink/af_netlink.c:2441 nfnetlink_rcv+0x1ab/0x1da0 net/netfilter/nfnetlink.c:515 net/netfilter/nfnetlink.c:515 netlink_unicast_kernel net/netlink/af_netlink.c:1294 [inline] netlink_unicast_kernel net/netlink/af_netlink.c:1294 [inline] net/netlink/af_netlink.c:1320 netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1320 net/netlink/af_netlink.c:1320 netlink_sendmsg+0x638/0xb90 net/netlink/af_netlink.c:1886 net/netlink/af_netlink.c:1886 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg_nosec net/socket.c:646 [inline] net/socket.c:656 sock_sendmsg+0xb5/0x100 net/socket.c:656 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SYSC_sendmsg net/socket.c:2107 [inline] net/socket.c:2103 SyS_sendmsg+0x27/0x40 net/socket.c:2103 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #1 (&table[i].mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock_common kernel/locking/mutex.c:756 [inline] kernel/locking/mutex.c:893 __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 kernel/locking/mutex.c:893 nf_tables_netdev_event+0x10d/0x4d0 net/netfilter/nf_tables_netdev.c:122 net/netfilter/nf_tables_netdev.c:122 notifier_call_chain+0x108/0x1a0 kernel/notifier.c:93 kernel/notifier.c:93 call_netdevice_notifiers_info net/core/dev.c:1667 [inline] call_netdevice_notifiers net/core/dev.c:1683 [inline] call_netdevice_notifiers_info net/core/dev.c:1667 [inline] net/core/dev.c:7211 call_netdevice_notifiers net/core/dev.c:1683 [inline] net/core/dev.c:7211 rollback_registered_many+0x765/0xba0 net/core/dev.c:7211 net/core/dev.c:7211 rollback_registered+0xca/0x170 net/core/dev.c:7253 net/core/dev.c:7253 unregister_netdevice_queue+0x1b4/0x360 net/core/dev.c:8274 net/core/dev.c:8274 unregister_netdevice include/linux/netdevice.h:2443 [inline] unregister_netdevice include/linux/netdevice.h:2443 [inline] drivers/net/ppp/ppp_generic.c:408 ppp_release+0x177/0x1a0 drivers/net/ppp/ppp_generic.c:408 drivers/net/ppp/ppp_generic.c:408 __fput+0x25f/0x7a0 fs/file_table.c:210 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] exit_task_work include/linux/task_work.h:22 [inline] kernel/exit.c:868 do_exit+0xa44/0x2850 kernel/exit.c:868 kernel/exit.c:868 do_group_exit+0x100/0x2e0 kernel/exit.c:965 kernel/exit.c:965 SYSC_exit_group kernel/exit.c:976 [inline] SYSC_exit_group kernel/exit.c:976 [inline] kernel/exit.c:974 SyS_exit_group+0x19/0x20 kernel/exit.c:974 kernel/exit.c:974 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 (rtnl_mutex){+.+.}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock_common kernel/locking/mutex.c:756 [inline] kernel/locking/mutex.c:893 __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 kernel/locking/mutex.c:893 unregister_netdevice_notifier+0x5e/0x2b0 net/core/dev.c:1630 net/core/dev.c:1630 tee_tg_destroy+0x5c/0xb0 net/netfilter/xt_TEE.c:123 net/netfilter/xt_TEE.c:123 cleanup_entry+0x232/0x310 net/ipv6/netfilter/ip6_tables.c:685 net/ipv6/netfilter/ip6_tables.c:685 __do_replace+0x38d/0x580 net/ipv6/netfilter/ip6_tables.c:1106 net/ipv6/netfilter/ip6_tables.c:1106 do_replace net/ipv6/netfilter/ip6_tables.c:1162 [inline] do_replace net/ipv6/netfilter/ip6_tables.c:1162 [inline] net/ipv6/netfilter/ip6_tables.c:1688 do_ip6t_set_ctl+0x256/0x3b0 net/ipv6/netfilter/ip6_tables.c:1688 net/ipv6/netfilter/ip6_tables.c:1688 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] net/netfilter/nf_sockopt.c:115 nf_setsockopt+0x5f/0xb0 net/netfilter/nf_sockopt.c:115 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0xc0/0x120 net/ipv6/ipv6_sockglue.c:937 net/ipv6/ipv6_sockglue.c:937 tcp_setsockopt+0x7b/0xc0 net/ipv4/tcp.c:2828 net/ipv4/tcp.c:2828 SYSC_setsockopt net/socket.c:1865 [inline] SYSC_setsockopt net/socket.c:1865 [inline] net/socket.c:1844 SyS_setsockopt+0x110/0x1e0 net/socket.c:1844 net/socket.c:1844 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb other info that might help us debug this: Chain exists of: rtnl_mutex --> &table[i].mutex --> &xt[i].mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&xt[i].mutex); lock(&table[i].mutex); lock(&xt[i].mutex); lock(rtnl_mutex); *** DEADLOCK *** 1 lock held by syz-executor027/7985: #0: (&xt[i].mutex){+.+.}, at: [] xt_find_table_lock+0x38/0x3d0 net/netfilter/x_tables.c:1088 net/netfilter/x_tables.c:1088 stack backtrace: CPU: 0 PID: 7985 Comm: syz-executor027 Not tainted 4.14.258-syzkaller #0 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 lib/dump_stack.c:17 [inline] lib/dump_stack.c:58 dump_stack+0x1b2/0x281 lib/dump_stack.c:58 lib/dump_stack.c:58 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258 kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1905 [inline] check_prevs_add kernel/locking/lockdep.c:2022 [inline] validate_chain kernel/locking/lockdep.c:2464 [inline] check_prev_add kernel/locking/lockdep.c:1905 [inline] kernel/locking/lockdep.c:3491 check_prevs_add kernel/locking/lockdep.c:2022 [inline] kernel/locking/lockdep.c:3491 validate_chain kernel/locking/lockdep.c:2464 [inline] kernel/locking/lockdep.c:3491 __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491 kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock_common kernel/locking/mutex.c:756 [inline] kernel/locking/mutex.c:893 __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 kernel/locking/mutex.c:893 unregister_netdevice_notifier+0x5e/0x2b0 net/core/dev.c:1630 net/core/dev.c:1630 tee_tg_destroy+0x5c/0xb0 net/netfilter/xt_TEE.c:123 net/netfilter/xt_TEE.c:123 cleanup_entry+0x232/0x310 net/ipv6/netfilter/ip6_tables.c:685 net/ipv6/netfilter/ip6_tables.c:685 __do_replace+0x38d/0x580 net/ipv6/netfilter/ip6_tables.c:1106 net/ipv6/netfilter/ip6_tables.c:1106 do_replace net/ipv6/netfilter/ip6_tables.c:1162 [inline] do_replace net/ipv6/netfilter/ip6_tables.c:1162 [inline] net/ipv6/netfilter/ip6_tables.c:1688 do_ip6t_set_ctl+0x256/0x3b0 net/ipv6/netfilter/ip6_tables.c:1688 net/ipv6/netfilter/ip6_tables.c:1688 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] net/netfilter/nf_sockopt.c:115 nf_setsockopt+0x5f/0xb0 net/netfilter/nf_sockopt.c:115 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0xc0/0x120 net/ipv6/ipv6_sockglue.c:937 net/ipv6/ipv6_sockglue.c:937 tcp_setsockopt+0x7b/0xc0 net/ipv4/tcp.c:2828 net/ipv4/tcp.c:2828 SYSC_setsockopt net/socket.c:1865 [inline] SYSC_setsockopt net/socket.c:1865 [inline] net/socket.c:1844 SyS_setsockopt+0x110/0x1e0 net/socket.c:1844 net/socket.c:1844 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f15c3e42599 RSP: 002b:00007ffec6dc5c08 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000003065736f72 RCX: 00007f15c3e42599 RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000460 R09: 00007ffec6dc5da8 R10: 0000000020000a80 R11: 0000000000000246 R12: 00007ffec6dc5c1c R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table net_ratelimit: 70 callbacks suppressed ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table net_ratelimit: 86 callbacks suppressed ip6_tables: ip6tables: counters copy to user failed while replacing table