======================================================
WARNING: possible circular locking dependency detected
4.15.0+ #297 Not tainted
------------------------------------------------------
syz-executor2/23284 is trying to acquire lock:
 (rtnl_mutex){+.+.}, at: [<0000000070f3adde>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74

but task is already holding lock:
 (&xt[i].mutex){+.+.}, at: [<00000000b311d784>] 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-executor2/23284:
 #0:  (&xt[i].mutex){+.+.}, at: [<00000000b311d784>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1041

stack backtrace:
CPU: 1 PID: 23284 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: 0033:0x453299
RSP: 002b:00007f23d390ec58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000014
RBP: 00000000000004d4 R08: 00000000000002e0 R09: 0000000000000000
R10: 0000000020777825 R11: 0000000000000212 R12: 00000000006f6480
R13: 00000000ffffffff R14: 00007f23d390f6d4 R15: 0000000000000000
netlink: 'syz-executor5': attribute type 1 has an invalid length.
netlink: 'syz-executor5': attribute type 1 has an invalid length.
binder: BINDER_SET_CONTEXT_MGR already set
binder: 23457:23475 ioctl 40046207 0 returned -16
binder_alloc: 23457: binder_alloc_buf, no vma
binder: 23457:23476 transaction failed 29189/-3, size 0-0 line 2957
kauditd_printk_skb: 671 callbacks suppressed
audit: type=1400 audit(1517835245.064:1758): avc:  denied  { call } for  pid=23457 comm="syz-executor4" 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
audit: type=1400 audit(1517835245.114:1759): avc:  denied  { net_admin } for  pid=6954 comm="syz-executor1" capability=12  scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
audit: type=1400 audit(1517835245.120:1760): avc:  denied  { net_admin } for  pid=6954 comm="syz-executor1" capability=12  scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
audit: type=1400 audit(1517835245.167:1761): avc:  denied  { net_admin } for  pid=4219 comm="syz-executor2" capability=12  scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
binder: send failed reply for transaction 127 to 23457:23461
audit: type=1400 audit(1517835245.198:1762): avc:  denied  { net_admin } for  pid=4221 comm="syz-executor5" capability=12  scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
audit: type=1400 audit(1517835245.204:1763): avc:  denied  { net_admin } for  pid=4221 comm="syz-executor5" capability=12  scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
binder: undelivered TRANSACTION_ERROR: 29189
audit: type=1400 audit(1517835245.263:1764): avc:  denied  { net_admin } for  pid=4222 comm="syz-executor4" capability=12  scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
binder: BINDER_SET_CONTEXT_MGR already set
binder: 23490:23504 ioctl 40046207 0 returned -16
audit: type=1400 audit(1517835245.298:1765): avc:  denied  { net_raw } for  pid=23489 comm="syz-executor5" capability=13  scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
audit: type=1400 audit(1517835245.308:1766): avc:  denied  { set_context_mgr } for  pid=23490 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
audit: type=1400 audit(1517835245.310:1767): avc:  denied  { map } for  pid=23500 comm="modprobe" path="/bin/kmod" dev="sda1" ino=1440 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
binder: 23619:23623 BC_CLEAR_DEATH_NOTIFICATION death notification not active
binder: 23619:23635 ERROR: BC_REGISTER_LOOPER called without request
binder: 23635 RLIMIT_NICE not set
binder: 23619:23623 BC_CLEAR_DEATH_NOTIFICATION invalid ref 0
SELinux: unrecognized netlink message: protocol=9 nlmsg_type=20 sclass=netlink_audit_socket pig=23652 comm=syz-executor2
SELinux: unrecognized netlink message: protocol=9 nlmsg_type=20 sclass=netlink_audit_socket pig=23652 comm=syz-executor2
binder_alloc: binder_alloc_mmap_handler: 23671 20521000-20523000 already mapped failed -16
binder_alloc: binder_alloc_mmap_handler: 23671 20000000-20002000 already mapped failed -16
binder: BINDER_SET_CONTEXT_MGR already set
binder: 23671:23674 ioctl 40046207 0 returned -16
rfkill: input handler disabled
rfkill: input handler enabled
rfkill: input handler disabled
rfkill: input handler enabled
QAT: Invalid ioctl
QAT: Invalid ioctl
*** Guest State ***
CR0: actual=0x0000000000000030, shadow=0x0000000060000010, gh_mask=fffffffffffffff7
CR4: actual=0x0000000000002050, shadow=0x0000000000000000, gh_mask=ffffffffffffe871
CR3 = 0x00000000fffbc000
RSP = 0x0000000000000000  RIP = 0x0000000000000000
RFLAGS=0x00220202         DR7 = 0x0000000000000400
Sysenter RSP=0000000000000000 CS:RIP=0000:0000000000000000
CS:   sel=0xf000, attr=0x0009b, limit=0x0000ffff, base=0x00000000ffff0000
DS:   sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000
SS:   sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000
ES:   sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000
FS:   sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000
GS:   sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000
GDTR:                           limit=0x0000ffff, base=0x0000000000000000
LDTR: sel=0x0000, attr=0x00082, limit=0x0000ffff, base=0x0000000000000000
IDTR:                           limit=0x0000ffff, base=0x0000000000000000
TR:   sel=0x0000, attr=0x0008b, limit=0x0000ffff, base=0x0000000000000000
EFER =     0x0000000000000000  PAT = 0x0007040600070406
DebugCtl = 0x0000000000000000  DebugExceptions = 0x0000000000000000
Interruptibility = 00000000  ActivityState = 00000000
*** Host State ***
RIP = 0xffffffff811c99dc  RSP = 0xffff8801aa81f3b8
CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040
FSBase=00007f5b24f62700 GSBase=ffff8801db400000 TRBase=fffffe0000003000
GDTBase=fffffe0000001000 IDTBase=fffffe0000000000
CR0=0000000080050033 CR3=00000001b528b001 CR4=00000000001626f0
Sysenter RSP=fffffe0000002200 CS:RIP=0010:ffffffff85a019f0
EFER = 0x0000000000000d01  PAT = 0x0000000000000000
*** Control State ***
PinBased=0000003f CPUBased=b699edfa SecondaryExec=000000c2
EntryControls=0000d1ff ExitControls=0023efff
ExceptionBitmap=00060042 PFECmask=00000000 PFECmatch=00000000
VMEntry: intr_info=00000000 errcode=00000000 ilen=00000000
VMExit: intr_info=00000000 errcode=00000000 ilen=00000000
        reason=80000021 qualification=0000000000000000
IDTVectoring: info=00000000 errcode=00000000
TSC Offset = 0xffffffa83a577eeb
EPT pointer = 0x00000001cf90301e
binder_alloc: binder_alloc_mmap_handler: 23822 20000000-20002000 already mapped failed -16
binder: BINDER_SET_CONTEXT_MGR already set
binder: 23822:23826 ioctl 40046207 0 returned -16
binder_alloc: 23822: binder_alloc_buf, no vma
binder: 23822:23840 transaction failed 29189/-3, size 0-0 line 2957
binder_alloc: 23822: binder_alloc_buf, no vma
binder: 23822:23854 transaction failed 29189/-3, size 0-0 line 2957
binder: undelivered TRANSACTION_ERROR: 29189
binder: undelivered TRANSACTION_ERROR: 29189
binder: undelivered TRANSACTION_COMPLETE
binder: undelivered TRANSACTION_COMPLETE
binder: undelivered transaction 135, process died.
binder: undelivered transaction 134, process died.
ip6t_REJECT: ECHOREPLY is not supported.
ip6t_REJECT: ECHOREPLY is not supported.
binder: 23978:23987 got reply transaction with bad transaction stack, transaction 139 has target 23978:0
binder: 23978:23987 transaction failed 29201/-71, size 0-0 line 2772
binder: BINDER_SET_CONTEXT_MGR already set
binder: 23978:24010 ioctl 40046207 0 returned -16
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
binder_alloc: 23978: binder_alloc_buf, no vma
binder: 23978:24018 transaction failed 29189/-3, size 40-8 line 2957
binder: 23978:23987 got reply transaction with no transaction stack
binder: 23978:23987 transaction failed 29201/-71, size 0-0 line 2757
binder: undelivered TRANSACTION_ERROR: 29201
binder: undelivered TRANSACTION_ERROR: 29189
binder: release 23978:23987 transaction 139 out, still active
binder: unexpected work type, 4, not freed
binder: undelivered TRANSACTION_COMPLETE
binder: undelivered TRANSACTION_ERROR: 29201
binder: send failed reply for transaction 139, target dead
QAT: Invalid ioctl
QAT: Invalid ioctl
QAT: Invalid ioctl
QAT: Invalid ioctl
kauditd_printk_skb: 499 callbacks suppressed
audit: type=1400 audit(1517835250.080:2265): avc:  denied  { net_raw } for  pid=24198 comm="syz-executor0" capability=13  scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
audit: type=1400 audit(1517835250.123:2266): avc:  denied  { net_admin } for  pid=4210 comm="syz-executor3" capability=12  scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
audit: type=1400 audit(1517835250.131:2267): avc:  denied  { map } for  pid=24209 comm="modprobe" path="/bin/kmod" dev="sda1" ino=1440 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(1517835250.140:2268): avc:  denied  { ipc_owner } for  pid=24212 comm="syz-executor7" capability=15  scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
audit: type=1400 audit(1517835250.144:2269): avc:  denied  { net_admin } for  pid=4216 comm="syz-executor0" capability=12  scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
audit: type=1400 audit(1517835250.157:2270): avc:  denied  { net_admin } for  pid=4223 comm="syz-executor6" capability=12  scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
audit: type=1400 audit(1517835250.158:2271): avc:  denied  { net_admin } for  pid=4222 comm="syz-executor4" capability=12  scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
audit: type=1400 audit(1517835250.164:2272): avc:  denied  { map } for  pid=24219 comm="modprobe" path="/bin/kmod" dev="sda1" ino=1440 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(1517835250.171:2273): avc:  denied  { ipc_owner } for  pid=24212 comm="syz-executor7" capability=15  scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
audit: type=1400 audit(1517835250.208:2274): avc:  denied  { net_admin } for  pid=4219 comm="syz-executor2" capability=12  scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1