====================================================== WARNING: possible circular locking dependency detected 4.14.171-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/18572 is trying to acquire lock: (rtnl_mutex){+.+.}, at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72 but task is already holding lock: (&xt[i].mutex){+.+.}, at: [] 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: -> #1 (&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_target+0x3e/0x1e0 net/netfilter/x_tables.c:232 xt_request_find_target net/netfilter/x_tables.c:261 [inline] xt_request_find_target+0x74/0xe0 net/netfilter/x_tables.c:254 ipt_init_target+0xce/0x290 net/sched/act_ipt.c:45 __tcf_ipt_init+0x48c/0xb50 net/sched/act_ipt.c:168 tcf_xt_init+0x4e/0x60 net/sched/act_ipt.c:210 tcf_action_init_1+0x53c/0xaa0 net/sched/act_api.c:682 tcf_action_init+0x2ab/0x480 net/sched/act_api.c:751 tcf_action_add net/sched/act_api.c:1079 [inline] tc_ctl_action+0x30a/0x548 net/sched/act_api.c:1131 rtnetlink_rcv_msg+0x3da/0xb70 net/core/rtnetlink.c:4315 netlink_rcv_skb+0x14f/0x3c0 net/netlink/af_netlink.c:2432 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4327 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 kernel_sendmsg+0x44/0x50 net/socket.c:664 sock_no_sendpage+0x107/0x130 net/core/sock.c:2569 kernel_sendpage+0x92/0xf0 net/socket.c:3407 sock_sendpage+0x8b/0xc0 net/socket.c:871 pipe_to_sendpage+0x242/0x340 fs/splice.c:451 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x348/0x780 fs/splice.c:626 splice_from_pipe+0xf0/0x150 fs/splice.c:661 generic_splice_sendpage+0x3c/0x50 fs/splice.c:832 do_splice_from fs/splice.c:851 [inline] do_splice fs/splice.c:1147 [inline] SYSC_splice fs/splice.c:1402 [inline] SyS_splice+0xd92/0x1430 fs/splice.c:1382 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 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 udp_setsockopt+0x4e/0x90 net/ipv4/udp.c:2451 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: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&xt[i].mutex); lock(rtnl_mutex); lock(&xt[i].mutex); lock(rtnl_mutex); *** DEADLOCK *** 1 lock held by syz-executor.0/18572: #0: (&xt[i].mutex){+.+.}, at: [] xt_find_table_lock+0x3c/0x3d0 net/netfilter/x_tables.c:1092 stack backtrace: CPU: 0 PID: 18572 Comm: syz-executor.0 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 udp_setsockopt+0x4e/0x90 net/ipv4/udp.c:2451 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 RIP: 0033:0x45c6c9 RSP: 002b:00007fc8feb97c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fc8feb986d4 RCX: 000000000045c6c9 RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 000000000076bf20 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000020000b80 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000a0b R14: 00000000004cca10 R15: 000000000076bf2c ip_tables: iptables: counters copy to user failed while replacing table input: syz0 as /devices/virtual/input/input25 input: syz0 as /devices/virtual/input/input26 input: syz0 as /devices/virtual/input/input27 input: syz0 as /devices/virtual/input/input28 uinput: write device info first input: syz0 as /devices/virtual/input/input30 input: syz0 as /devices/virtual/input/input31 device lo entered promiscuous mode device lo left promiscuous mode device dummy0 entered promiscuous mode device dummy0 left promiscuous mode kauditd_printk_skb: 61 callbacks suppressed audit: type=1400 audit(1581947525.473:2057): avc: denied { map } for pid=18689 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=0 audit: type=1400 audit(1581947525.573:2058): avc: denied { map } for pid=18693 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=0 loop0: p1 p2 p3 p4 loop0: partition table partially beyond EOD, truncated loop0: p1 start 10 is beyond EOD, truncated audit: type=1400 audit(1581947525.613:2059): avc: denied { map } for pid=18694 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=0 audit: type=1400 audit(1581947525.693:2060): avc: denied { map } for pid=18697 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=0 loop0: p2 size 1073741824 extends beyond EOD, truncated loop0: p3 start 225 is beyond EOD, truncated loop0: p4 size 3657465856 extends beyond EOD, truncated audit: type=1400 audit(1581947525.833:2061): avc: denied { map } for pid=18699 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=0 loop0: p1 p2 p3 p4 loop0: partition table partially beyond EOD, truncated audit: type=1400 audit(1581947525.943:2062): avc: denied { map } for pid=18700 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=0 loop0: p1 start 10 is beyond EOD, truncated loop0: p2 size 1073741824 extends beyond EOD, truncated loop0: p3 start 225 is beyond EOD, truncated loop0: p4 size 3657465856 extends beyond EOD, truncated audit: type=1400 audit(1581947525.953:2063): avc: denied { map } for pid=18702 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=0 audit: type=1400 audit(1581947526.103:2064): avc: denied { map } for pid=18710 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=0 audit: type=1400 audit(1581947526.253:2065): avc: denied { map } for pid=18714 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=0 loop0: p1 p2 p3 p4 loop0: partition table partially beyond EOD, truncated loop0: p1 start 10 is beyond EOD, truncated x_tables: ip6_tables: REJECT target: used from hooks POSTROUTING, but only usable from INPUT/FORWARD/OUTPUT loop0: p2 size 1073741824 extends beyond EOD, truncated audit: type=1400 audit(1581947526.263:2066): avc: denied { map } for pid=18717 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=0 loop0: p3 start 225 is beyond EOD, truncated x_tables: ip6_tables: REJECT target: used from hooks POSTROUTING, but only usable from INPUT/FORWARD/OUTPUT loop0: p4 size 3657465856 extends beyond EOD, truncated loop0: p1 p2 p3 p4 loop0: partition table partially beyond EOD, truncated loop0: p1 start 10 is beyond EOD, truncated loop0: p2 size 1073741824 extends beyond EOD, truncated loop0: p3 start 225 is beyond EOD, truncated loop0: p4 size 3657465856 extends beyond EOD, truncated loop0: p1 p2 p3 p4 loop0: partition table partially beyond EOD, truncated loop0: p1 start 10 is beyond EOD, truncated loop0: p2 size 1073741824 extends beyond EOD, truncated loop0: p3 start 225 is beyond EOD, truncated loop0: p4 size 3657465856 extends beyond EOD, truncated ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table kauditd_printk_skb: 77 callbacks suppressed audit: type=1400 audit(1581947530.503:2144): avc: denied { map } for pid=18973 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=0 audit: type=1400 audit(1581947530.503:2145): avc: denied { map } for pid=18974 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=0 audit: type=1400 audit(1581947530.903:2146): avc: denied { map } for pid=18988 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=0 audit: type=1400 audit(1581947530.923:2147): avc: denied { map } for pid=18989 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=0 audit: type=1400 audit(1581947530.923:2148): avc: denied { map } for pid=18994 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=0 audit: type=1400 audit(1581947530.943:2149): avc: denied { create } for pid=18990 comm="syz-executor.4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=0 audit: type=1400 audit(1581947531.103:2150): avc: denied { map } for pid=19009 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=0 audit: type=1400 audit(1581947531.113:2151): avc: denied { map } for pid=19011 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=0 audit: type=1400 audit(1581947531.143:2152): avc: denied { map } for pid=19012 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=0 audit: type=1400 audit(1581947531.223:2153): avc: denied { map } for pid=19017 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=0