======================================================
WARNING: possible circular locking dependency detected
4.15.0+ #297 Not tainted
------------------------------------------------------
syz-executor2/4224 is trying to acquire lock:
 (rtnl_mutex){+.+.}, at: [<00000000dd9c2bd7>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74

but task is already holding lock:
 (&xt[i].mutex){+.+.}, at: [<0000000032f85208>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1041

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_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1041
       xt_request_find_table_lock+0x28/0xc0 net/netfilter/x_tables.c:1088
       get_info+0x154/0x690 net/ipv6/netfilter/ip6_tables.c:989
       do_ipt_get_ctl+0x159/0xac0 net/ipv4/netfilter/ip_tables.c:1699
       nf_sockopt net/netfilter/nf_sockopt.c:104 [inline]
       nf_getsockopt+0x6a/0xc0 net/netfilter/nf_sockopt.c:122
       ip_getsockopt+0x15c/0x220 net/ipv4/ip_sockglue.c:1571
       tcp_getsockopt+0x82/0xd0 net/ipv4/tcp.c:3359
       sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2934
       SYSC_getsockopt net/socket.c:1880 [inline]
       SyS_getsockopt+0x178/0x340 net/socket.c:1862
       do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287
       entry_SYSCALL_64_after_hwframe+0x26/0x9b

-> #1 (sk_lock-AF_INET){+.+.}:
       lock_sock_nested+0xc2/0x110 net/core/sock.c:2777
       lock_sock include/net/sock.h:1463 [inline]
       do_ip_setsockopt.isra.12+0x1d9/0x3210 net/ipv4/ip_sockglue.c:646
       ip_setsockopt+0x3a/0xa0 net/ipv4/ip_sockglue.c:1252
       tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905
       sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2975
       SYSC_setsockopt net/socket.c:1849 [inline]
       SyS_setsockopt+0x189/0x360 net/socket.c:1828
       do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287
       entry_SYSCALL_64_after_hwframe+0x26/0x9b

-> #0 (rtnl_mutex){+.+.}:
       lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920
       __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
       unregister_netdevice_notifier+0x91/0x4e0 net/core/dev.c:1673
       tee_tg_destroy+0x61/0xc0 net/netfilter/xt_TEE.c:123
       cleanup_entry+0x218/0x350 net/ipv4/netfilter/ip_tables.c:654
       __do_replace+0x79d/0xa50 net/ipv4/netfilter/ip_tables.c:1089
       do_replace net/ipv4/netfilter/ip_tables.c:1145 [inline]
       do_ipt_set_ctl+0x40f/0x5f0 net/ipv4/netfilter/ip_tables.c:1675
       nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
       nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115
       ip_setsockopt+0x97/0xa0 net/ipv4/ip_sockglue.c:1259
       tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905
       sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2975
       SYSC_setsockopt net/socket.c:1849 [inline]
       SyS_setsockopt+0x189/0x360 net/socket.c:1828
       do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287
       entry_SYSCALL_64_after_hwframe+0x26/0x9b

other info that might help us debug this:

Chain exists of:
  rtnl_mutex --> sk_lock-AF_INET --> &xt[i].mutex

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&xt[i].mutex);
                               lock(sk_lock-AF_INET);
                               lock(&xt[i].mutex);
  lock(rtnl_mutex);

 *** DEADLOCK ***

1 lock held by syz-executor2/4224:
 #0:  (&xt[i].mutex){+.+.}, at: [<0000000032f85208>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1041

stack backtrace:
CPU: 0 PID: 4224 Comm: syz-executor2 Not tainted 4.15.0+ #297
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.38+0x2cd/0x2dc kernel/locking/lockdep.c:1223
 check_prev_add kernel/locking/lockdep.c:1863 [inline]
 check_prevs_add kernel/locking/lockdep.c:1976 [inline]
 validate_chain kernel/locking/lockdep.c:2417 [inline]
 __lock_acquire+0x30a8/0x3e00 kernel/locking/lockdep.c:3431
 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920
 __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
 unregister_netdevice_notifier+0x91/0x4e0 net/core/dev.c:1673
 tee_tg_destroy+0x61/0xc0 net/netfilter/xt_TEE.c:123
 cleanup_entry+0x218/0x350 net/ipv4/netfilter/ip_tables.c:654
 __do_replace+0x79d/0xa50 net/ipv4/netfilter/ip_tables.c:1089
 do_replace net/ipv4/netfilter/ip_tables.c:1145 [inline]
 do_ipt_set_ctl+0x40f/0x5f0 net/ipv4/netfilter/ip_tables.c:1675
 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
 nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115
 ip_setsockopt+0x97/0xa0 net/ipv4/ip_sockglue.c:1259
 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905
 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2975
 SYSC_setsockopt net/socket.c:1849 [inline]
 SyS_setsockopt+0x189/0x360 net/socket.c:1828
 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x26/0x9b
RIP: 0033:0x455d8a
RSP: 002b:0000000000a2f598 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00000000006f8a40 RCX: 0000000000455d8a
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000013
RBP: 00000000006f8a40 R08: 00000000000002d8 R09: 0000000000000001
R10: 00000000006f8e68 R11: 0000000000000206 R12: 0000000000000013
R13: 00000000006fb9e8 R14: 00000000000172b7 R15: 0000000000000010
binder: 12910:12914 got transaction with fd, -1, but target does not allow fds
binder: 12910:12914 transaction failed 29201/-1, size 24-8 line 3062
binder: BINDER_SET_CONTEXT_MGR already set
binder: 12910:12935 ioctl 40046207 0 returned -16
binder_alloc: 12910: binder_alloc_buf, no vma
binder: 12910:12930 transaction failed 29189/-3, size 24-8 line 2957
binder: undelivered TRANSACTION_ERROR: 29189
binder: undelivered TRANSACTION_ERROR: 29201
sock: sock_set_timeout: `syz-executor5' (pid 12999) tries to set negative timeout
sock: sock_set_timeout: `syz-executor5' (pid 13008) tries to set negative timeout
sock: sock_set_timeout: `syz-executor1' (pid 13301) tries to set negative timeout
sock: sock_set_timeout: `syz-executor1' (pid 13301) tries to set negative timeout
netlink: 8 bytes leftover after parsing attributes in process `syz-executor6'.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor6'.
device eql entered promiscuous mode
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
QAT: Invalid ioctl
sock: process `syz-executor0' is using obsolete setsockopt SO_BSDCOMPAT
QAT: Invalid ioctl
xt_SECMARK: invalid security context 'system_u:objct_r:policy_src_t:s0'
xt_SECMARK: invalid security context 'system_u:objct_r:policy_src_t:s0'
binder: 13665 RLIMIT_NICE not set
binder: 13665 RLIMIT_NICE not set
binder: BINDER_SET_CONTEXT_MGR already set
binder: 13648:13678 ioctl 40046207 0 returned -16
binder: 13665 RLIMIT_NICE not set
binder: release 13648:13665 transaction 58 in, still active
binder: send failed reply for transaction 58 to 13648:13678
binder: undelivered TRANSACTION_COMPLETE
binder: undelivered TRANSACTION_ERROR: 29189
netlink: 'syz-executor1': attribute type 1 has an invalid length.
QAT: Invalid ioctl
kauditd_printk_skb: 53 callbacks suppressed
audit: type=1400 audit(1517833069.363:229): avc:  denied  { map } for  pid=13815 comm="syz-executor4" path="pipe:[32975]" dev="pipefs" ino=32975 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=fifo_file permissive=1
device eql entered promiscuous mode
QAT: Invalid ioctl
binder: 13860:13871 BC_ACQUIRE_DONE u0000000000000000 no match
binder: 13860:13871 BC_ACQUIRE_DONE u0000000000000000 no match
netlink: 3692 bytes leftover after parsing attributes in process `syz-executor0'.
netlink: 3692 bytes leftover after parsing attributes in process `syz-executor0'.
QAT: Invalid ioctl
QAT: Invalid ioctl
FAULT_FLAG_ALLOW_RETRY missing 30
CPU: 0 PID: 13989 Comm: syz-executor5 Not tainted 4.15.0+ #297
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
 handle_userfault+0xbd9/0x2500 fs/userfaultfd.c:430
 do_anonymous_page mm/memory.c:3153 [inline]
 handle_pte_fault mm/memory.c:3967 [inline]
 __handle_mm_fault+0x32a3/0x3ce0 mm/memory.c:4093
 handle_mm_fault+0x38f/0x930 mm/memory.c:4130
 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1426
 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1501
 page_fault+0x2c/0x60 arch/x86/entry/entry_64.S:1148
RIP: 0010:fault_in_pages_readable arch/x86/include/asm/smap.h:58 [inline]
RIP: 0010:iov_iter_fault_in_readable+0x1aa/0x420 lib/iov_iter.c:421
RSP: 0018:ffff8801b023f7e0 EFLAGS: 00010246
RAX: 0000000000010000 RBX: 0000000020011fd2 RCX: ffffffff825be591
RDX: 00000000000000c6 RSI: ffffc90003a4d000 RDI: ffff8801b023fbe0
RBP: ffff8801b023f8c0 R08: 1ffff100376664fa R09: 1ffff10036047ef1
R10: ffff8801b023f710 R11: ffffffff8814c0c8 R12: 1ffff10036047eff
R13: ffff8801b023f898 R14: 0000000000000000 R15: ffff8801b023fbd8
 generic_perform_write+0x200/0x600 mm/filemap.c:3128
 __generic_file_write_iter+0x366/0x5b0 mm/filemap.c:3263
 generic_file_write_iter+0x399/0x790 mm/filemap.c:3291
 call_write_iter include/linux/fs.h:1781 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x684/0x970 fs/read_write.c:482
 vfs_write+0x189/0x510 fs/read_write.c:544
 SYSC_write fs/read_write.c:589 [inline]
 SyS_write+0xef/0x220 fs/read_write.c:581
 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x26/0x9b
RIP: 0033:0x453299
RSP: 002b:00007f2548acbc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299
RDX: 000000000000001c RSI: 0000000020011fd2 RDI: 0000000000000014
RBP: 000000000000065e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f8970
R13: 00000000ffffffff R14: 00007f2548acc6d4 R15: 0000000000000000
netlink: 'syz-executor2': attribute type 21 has an invalid length.
audit: type=1400 audit(1517833071.923:230): avc:  denied  { bind } for  pid=14099 comm="syz-executor3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_crypto_socket permissive=1
audit: type=1400 audit(1517833071.949:231): avc:  denied  { write } for  pid=14099 comm="syz-executor3" path="socket:[32525]" dev="sockfs" ino=32525 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_crypto_socket permissive=1
netlink: 'syz-executor2': attribute type 21 has an invalid length.
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
QAT: Invalid ioctl
QAT: Invalid ioctl
QAT: Invalid ioctl
QAT: Invalid ioctl
audit: type=1400 audit(1517833072.587:232): avc:  denied  { transfer } for  pid=14307 comm="syz-executor1" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=binder permissive=1
binder: send failed reply for transaction 60 to 14307:14310
binder_alloc: 14307: binder_alloc_buf, no vma
binder: 14307:14310 transaction failed 29189/-3, size 40-8 line 2957
binder: 14307:14336 BC_INCREFS_DONE u0000000000000000 node 63 cookie mismatch 0000000000000001 != 0000000000000000
binder: 14307:14310 ioctl c0306201 20008000 returned -14
netlink: 5 bytes leftover after parsing attributes in process `syz-executor6'.
binder: undelivered TRANSACTION_COMPLETE
binder: undelivered TRANSACTION_ERROR: 29189
netlink: 5 bytes leftover after parsing attributes in process `syz-executor6'.
QAT: Invalid ioctl
can: request_module (can-proto-5) failed.
QAT: Invalid ioctl
can: request_module (can-proto-5) failed.
audit: type=1400 audit(1517833073.035:233): avc:  denied  { map } for  pid=14416 comm="syz-executor6" path="/root/syz-executor6" dev="sda1" ino=16480 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
audit: type=1400 audit(1517833073.065:234): avc:  denied  { map } for  pid=14416 comm="syz-executor6" path="/sys/kernel/debug/kcov" dev="debugfs" ino=9083 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:debugfs_t:s0 tclass=file permissive=1
device syz0 entered promiscuous mode
IPVS: ftp: loaded support on port[0] = 21
audit: type=1400 audit(1517833073.366:235): avc:  denied  { map } for  pid=14447 comm="sh" path="/bin/dash" dev="sda1" ino=1473 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
QAT: Invalid ioctl
devpts: called with bogus options
QAT: Invalid ioctl
devpts: called with bogus options