======================================================
WARNING: possible circular locking dependency detected
4.14.171-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.3/7396 is trying to acquire lock:
 (rtnl_mutex){+.+.}, at: [<ffffffff85214c07>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72

but task is already holding lock:
 (&xt[i].mutex){+.+.}, at: [<ffffffff854c922c>] xt_find_table_lock+0x3c/0x3d0 net/netfilter/x_tables.c:1092

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&xt[i].mutex){+.+.}:
       lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
       __mutex_lock_common kernel/locking/mutex.c:756 [inline]
       __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
       mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
       xt_find_revision+0x82/0x200 net/netfilter/x_tables.c:373
       nfnl_compat_get+0x229/0x950 net/netfilter/nft_compat.c:678
       nfnetlink_rcv_msg+0xa08/0xc00 net/netfilter/nfnetlink.c:214
       netlink_rcv_skb+0x14f/0x3c0 net/netlink/af_netlink.c:2432
       nfnetlink_rcv+0x1ab/0x1650 net/netfilter/nfnetlink.c:515
       netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline]
       netlink_unicast+0x44d/0x650 net/netlink/af_netlink.c:1312
       netlink_sendmsg+0x7c4/0xc60 net/netlink/af_netlink.c:1877
       sock_sendmsg_nosec net/socket.c:646 [inline]
       sock_sendmsg+0xce/0x110 net/socket.c:656
       ___sys_sendmsg+0x70a/0x840 net/socket.c:2062
       __sys_sendmsg+0xb9/0x140 net/socket.c:2096
       SYSC_sendmsg net/socket.c:2107 [inline]
       SyS_sendmsg+0x2d/0x50 net/socket.c:2103
       do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x42/0xb7

-> #1 (&table[i].mutex){+.+.}:
       lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
       __mutex_lock_common kernel/locking/mutex.c:756 [inline]
       __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
       mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
       nfnl_lock+0x24/0x30 net/netfilter/nfnetlink.c:61
       nf_tables_netdev_event+0x13f/0x580 net/netfilter/nf_tables_netdev.c:122
       notifier_call_chain+0x111/0x1b0 kernel/notifier.c:93
       __raw_notifier_call_chain kernel/notifier.c:394 [inline]
       raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:401
       call_netdevice_notifiers_info+0x56/0x70 net/core/dev.c:1671
       call_netdevice_notifiers net/core/dev.c:1687 [inline]
       rollback_registered_many+0x70d/0xb60 net/core/dev.c:7205
       rollback_registered+0xdd/0x180 net/core/dev.c:7247
       unregister_netdevice_queue net/core/dev.c:8259 [inline]
       unregister_netdevice_queue+0x1ae/0x230 net/core/dev.c:8252
       unregister_netdevice include/linux/netdevice.h:2442 [inline]
       unregister_netdev+0x1d/0x30 net/core/dev.c:8300
       slip_close+0x162/0x1c0 drivers/net/slip/slip.c:909
       tty_ldisc_close.isra.0+0x99/0xd0 drivers/tty/tty_ldisc.c:505
       tty_ldisc_kill+0x4b/0xc0 drivers/tty/tty_ldisc.c:651
       tty_ldisc_release+0xb6/0x230 drivers/tty/tty_ldisc.c:818
       tty_release_struct+0x1b/0x50 drivers/tty/tty_io.c:1603
       tty_release+0xaa3/0xd60 drivers/tty/tty_io.c:1776
       __fput+0x275/0x7a0 fs/file_table.c:210
       ____fput+0x16/0x20 fs/file_table.c:244
       task_work_run+0x114/0x190 kernel/task_work.c:113
       tracehook_notify_resume include/linux/tracehook.h:191 [inline]
       exit_to_usermode_loop+0x1da/0x220 arch/x86/entry/common.c:164
       prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
       syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
       do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
       entry_SYSCALL_64_after_hwframe+0x42/0xb7

-> #0 (rtnl_mutex){+.+.}:
       check_prev_add kernel/locking/lockdep.c:1901 [inline]
       check_prevs_add kernel/locking/lockdep.c:2018 [inline]
       validate_chain kernel/locking/lockdep.c:2460 [inline]
       __lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487
       lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
       __mutex_lock_common kernel/locking/mutex.c:756 [inline]
       __mutex_lock+0xe8/0x1470 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+0x5f/0x2c0 net/core/dev.c:1634
       tee_tg_destroy+0x61/0xc0 net/netfilter/xt_TEE.c:123
       cleanup_entry+0x17d/0x230 net/ipv4/netfilter/ip_tables.c:666
       __do_replace+0x3c5/0x5b0 net/ipv4/netfilter/ip_tables.c:1086
       do_replace net/ipv4/netfilter/ip_tables.c:1142 [inline]
       do_ipt_set_ctl+0x296/0x3ee net/ipv4/netfilter/ip_tables.c:1674
       nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
       nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115
       ip_setsockopt net/ipv4/ip_sockglue.c:1255 [inline]
       ip_setsockopt+0x9b/0xb0 net/ipv4/ip_sockglue.c:1240
       tcp_setsockopt net/ipv4/tcp.c:2826 [inline]
       tcp_setsockopt+0x84/0xd0 net/ipv4/tcp.c:2820
       sock_common_setsockopt+0x94/0xd0 net/core/sock.c:2968
       SYSC_setsockopt net/socket.c:1865 [inline]
       SyS_setsockopt+0x13c/0x210 net/socket.c:1844
       do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x42/0xb7

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-executor.3/7396:
 #0:  (&xt[i].mutex){+.+.}, at: [<ffffffff854c922c>] xt_find_table_lock+0x3c/0x3d0 net/netfilter/x_tables.c:1092

stack backtrace:
CPU: 0 PID: 7396 Comm: syz-executor.3 Not tainted 4.14.171-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+0x142/0x197 lib/dump_stack.c:58
 print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1258
 check_prev_add kernel/locking/lockdep.c:1901 [inline]
 check_prevs_add kernel/locking/lockdep.c:2018 [inline]
 validate_chain kernel/locking/lockdep.c:2460 [inline]
 __lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487
 lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
 __mutex_lock_common kernel/locking/mutex.c:756 [inline]
 __mutex_lock+0xe8/0x1470 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+0x5f/0x2c0 net/core/dev.c:1634
 tee_tg_destroy+0x61/0xc0 net/netfilter/xt_TEE.c:123
 cleanup_entry+0x17d/0x230 net/ipv4/netfilter/ip_tables.c:666
 __do_replace+0x3c5/0x5b0 net/ipv4/netfilter/ip_tables.c:1086
 do_replace net/ipv4/netfilter/ip_tables.c:1142 [inline]
 do_ipt_set_ctl+0x296/0x3ee net/ipv4/netfilter/ip_tables.c:1674
 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
 nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115
 ip_setsockopt net/ipv4/ip_sockglue.c:1255 [inline]
 ip_setsockopt+0x9b/0xb0 net/ipv4/ip_sockglue.c:1240
 tcp_setsockopt net/ipv4/tcp.c:2826 [inline]
 tcp_setsockopt+0x84/0xd0 net/ipv4/tcp.c:2820
 sock_common_setsockopt+0x94/0xd0 net/core/sock.c:2968
 SYSC_setsockopt net/socket.c:1865 [inline]
 SyS_setsockopt+0x13c/0x210 net/socket.c:1844
REISERFS warning (device loop0): super-6506 reiserfs_getopt: bad value "no_unhashe†_relocation" for option "block-allocator"

 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45ef5a
RSP: 002b:00007ffd4d5da768 EFLAGS: 00000202 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007ffd4d5da790 RCX: 000000000045ef5a
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 000000000071fe80 R08: 00000000000002d8 R09: 0000000000004000
R10: 000000000071dd20 R11: 0000000000000202 R12: 0000000000000003
R13: 0000000000000000 R14: 0000000000000000 R15: 000000000071dcc0
audit: type=1804 audit(1582464949.816:121): pid=19891 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir535531041/syzkaller.Lp0P9C/565/file0" dev="sda1" ino=17325 res=1
audit: type=1800 audit(1582464949.856:122): pid=19891 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="sda1" ino=17325 res=0
libceph: connect [d::]:6789 error -101
libceph: mon0 [d::]:6789 connect error
audit: type=1800 audit(1582464950.306:123): pid=19891 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="sda1" ino=17325 res=0
XFS (loop3): unknown mount option [euid<00000000000000000000].
XFS (loop3): unknown mount option [euid<00000000000000000000].
libceph: connect [d::]:6789 error -101
libceph: mon0 [d::]:6789 connect error
libceph: connect [d::]:6789 error -101
libceph: mon0 [d::]:6789 connect error
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'.
libceph: connect [d::]:6789 error -101
libceph: mon0 [d::]:6789 connect error
libceph: connect [d::]:6789 error -101
libceph: mon0 [d::]:6789 connect error
libceph: connect [d::]:6789 error -101
libceph: mon0 [d::]:6789 connect error
ieee80211 phy3: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy3: hwaddr 02:00:00:00:03:00 registered
ieee80211 phy4: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy4: hwaddr 02:00:00:00:04:00 registered
ieee80211 phy5: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy5: hwaddr 02:00:00:00:05:00 registered
libceph: connect [d::]:6789 error -101
libceph: mon0 [d::]:6789 connect error
ieee80211 phy6: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy6: hwaddr 02:00:00:00:06:00 registered
ieee80211 phy7: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy7: hwaddr 02:00:00:00:07:00 registered
ieee80211 phy8: Selected rate control algorithm 'minstrel_ht'
libceph: connect [d::]:6789 error -101
libceph: mon0 [d::]:6789 connect error
ieee80211 phy8: hwaddr 02:00:00:00:08:00 registered
libceph: connect [d::]:6789 error -101
libceph: mon0 [d::]:6789 connect error
ieee80211 phy9: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy9: hwaddr 02:00:00:00:09:00 registered
libceph: connect [d::]:6789 error -101
libceph: mon0 [d::]:6789 connect error
libceph: connect [d::]:6789 error -101
libceph: mon0 [d::]:6789 connect error
ieee80211 phy10: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy10: hwaddr 02:00:00:00:0a:00 registered
ieee80211 phy11: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy11: hwaddr 02:00:00:00:0b:00 registered
ieee80211 phy12: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy12: hwaddr 02:00:00:00:0c:00 registered
ieee80211 phy13: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy13: hwaddr 02:00:00:00:0d:00 registered
ieee80211 phy14: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy14: hwaddr 02:00:00:00:0e:00 registered
ieee80211 phy15: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy15: hwaddr 02:00:00:00:0f:00 registered
libceph: connect [d::]:6789 error -101
libceph: mon0 [d::]:6789 connect error
ieee80211 phy16: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy16: hwaddr 02:00:00:00:10:00 registered
libceph: connect [d::]:6789 error -101
libceph: mon0 [d::]:6789 connect error
ieee80211 phy17: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy17: hwaddr 02:00:00:00:11:00 registered
libceph: connect [d::]:6789 error -101
libceph: mon0 [d::]:6789 connect error
ieee80211 phy18: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy18: hwaddr 02:00:00:00:12:00 registered