======================================================
WARNING: possible circular locking dependency detected
4.14.171-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.0/8934 is trying to acquire lock:
(&table[i].mutex){+.+.}, at: [<ffffffff853f6884>] nfnl_lock+0x24/0x30 net/netfilter/nfnetlink.c:61
but task is already holding lock:
(&xt[i].mutex){+.+.}, at: [<ffffffff854cf22c>] 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_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
-> #0 (&table[i].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
nfnl_lock+0x24/0x30 net/netfilter/nfnetlink.c:61
ip_set_nfnl_put+0x120/0x320 net/netfilter/ipset/ip_set_core.c:730
set_match_v1_destroy+0x7c/0xb0 net/netfilter/xt_set.c:158
cleanup_match+0xc2/0x140 net/ipv6/netfilter/ip6_tables.c:491
cleanup_entry+0xbf/0x230 net/ipv4/netfilter/ip_tables.c:658
__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:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&xt[i].mutex);
lock(&table[i].mutex);
lock(&xt[i].mutex);
lock(&table[i].mutex);
*** DEADLOCK ***
1 lock held by syz-executor.0/8934:
#0: (&xt[i].mutex){+.+.}, at: [<ffffffff854cf22c>] xt_find_table_lock+0x3c/0x3d0 net/netfilter/x_tables.c:1092
stack backtrace:
CPU: 0 PID: 8934 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
nfnl_lock+0x24/0x30 net/netfilter/nfnetlink.c:61
ip_set_nfnl_put+0x120/0x320 net/netfilter/ipset/ip_set_core.c:730
set_match_v1_destroy+0x7c/0xb0 net/netfilter/xt_set.c:158
cleanup_match+0xc2/0x140 net/ipv6/netfilter/ip6_tables.c:491
cleanup_entry+0xbf/0x230 net/ipv4/netfilter/ip_tables.c:658
__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
RIP: 0033:0x45c6c9
RSP: 002b:00007fe1c8e6bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fe1c8e6c6d4 RCX: 000000000045c6c9
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 000000000076bf20 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000020000200 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000a0a R14: 00000000004cc9f6 R15: 000000000076bf2c
ip_tables: iptables: counters copy to user failed while replacing table
ip_tables: iptables: counters copy to user failed while replacing table
ip_tables: iptables: counters copy to user failed while replacing table
ip_tables: iptables: counters copy to user failed while replacing table
ip_tables: iptables: counters copy to user failed while replacing table
ip_tables: iptables: counters copy to user failed while replacing table
ip_tables: iptables: counters copy to user failed while replacing table
ip_tables: iptables: counters copy to user failed while replacing table
ip_tables: iptables: counters copy to user failed while replacing table
net_ratelimit: 2 callbacks suppressed
ip_tables: iptables: counters copy to user failed while replacing table
ip_tables: iptables: counters copy to user failed while replacing table
ip_tables: iptables: counters copy to user failed while replacing table
ip_tables: iptables: counters copy to user failed while replacing table
ip_tables: iptables: counters copy to user failed while replacing table
ip_tables: iptables: counters copy to user failed while replacing table
ip_tables: iptables: counters copy to user failed while replacing table
ip_tables: iptables: counters copy to user failed while replacing table
ip_tables: iptables: counters copy to user failed while replacing table
ip_tables: iptables: counters copy to user failed while replacing table