BUG: sleeping function called from invalid context at arch/x86/mm/fault.c:1385
in_atomic(): 0, irqs_disabled(): 0, pid: 4160, name: syz-executor.0
3 locks held by syz-executor.0/4160:
 #0:  (&table[i].mutex){+.+.}, at: [<ffffffff851f48ea>] nfnl_lock net/netfilter/nfnetlink.c:61 [inline]
 #0:  (&table[i].mutex){+.+.}, at: [<ffffffff851f48ea>] nfnetlink_rcv_msg+0x78a/0xc00 net/netfilter/nfnetlink.c:209
 #1:  (rcu_read_lock){....}, at: [<ffffffff85248ee6>] ctnetlink_create_conntrack+0x166/0x1040 net/netfilter/nf_conntrack_netlink.c:1785
 #2:  (&mm->mmap_sem){++++}, at: [<ffffffff8128b84d>] __do_page_fault+0x2cd/0xb40 arch/x86/mm/fault.c:1371
Preemption disabled at:
[<ffffffff814baa10>] rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1185 [inline]
[<ffffffff814baa10>] rcu_lockdep_current_cpu_online+0x30/0x140 kernel/rcu/tree.c:1177
CPU: 1 PID: 4160 Comm: syz-executor.0 Not tainted 4.14.176-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+0x13e/0x194 lib/dump_stack.c:58
 ___might_sleep.cold+0x1bd/0x1f9 kernel/sched/core.c:6041
 __do_page_fault+0x2f0/0xb40 arch/x86/mm/fault.c:1385
 page_fault+0x25/0x50 arch/x86/entry/entry_64.S:1122
RIP: 0010:          (null)
RSP: 0018:ffff88804c61f268 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88804c61f2f0 RCX: ffffc90005b72000
RDX: 1ffffffff112602d RSI: ffff88804c61f2a0 RDI: ffff88804c61f2f0
RBP: ffff8880a12c0dc0 R08: ffffffff873c64a0 R09: ffff88804c61f2f0
R10: ffffed10098c3e63 R11: ffff88804c61f31f R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff88930130 R15: ffff88804c61f2a0
BUG: unable to handle kernel NULL pointer dereference at           (null)
IP:           (null)
PGD 8c8fc067 P4D 8c8fc067 PUD a016a067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 4160 Comm: syz-executor.0 Tainted: G        W       4.14.176-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880489522c0 task.stack: ffff88804c618000
RIP: 0010:          (null)
RSP: 0018:ffff88804c61f268 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88804c61f2f0 RCX: ffffc90005b72000
RDX: 1ffffffff112602d RSI: ffff88804c61f2a0 RDI: ffff88804c61f2f0
RBP: ffff8880a12c0dc0 R08: ffffffff873c64a0 R09: ffff88804c61f2f0
R10: ffffed10098c3e63 R11: ffff88804c61f31f R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff88930130 R15: ffff88804c61f2a0
FS:  00007f03cb9d1700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc74643648 CR3: 00000000a53e4000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 nfnetlink_parse_nat net/netfilter/nf_nat_core.c:747 [inline]
 nfnetlink_parse_nat_setup+0x1e0/0x370 net/netfilter/nf_nat_core.c:784
 ctnetlink_parse_nat_setup+0x70/0x490 net/netfilter/nf_conntrack_netlink.c:1421
 ctnetlink_setup_nat net/netfilter/nf_conntrack_netlink.c:1496 [inline]
 ctnetlink_create_conntrack+0x477/0x1040 net/netfilter/nf_conntrack_netlink.c:1840
 ctnetlink_new_conntrack+0x460/0xc30 net/netfilter/nf_conntrack_netlink.c:1964
 nfnetlink_rcv_msg+0xa08/0xc00 net/netfilter/nfnetlink.c:214
 netlink_rcv_skb+0x127/0x370 net/netlink/af_netlink.c:2433
 nfnetlink_rcv+0x1ab/0x1650 net/netfilter/nfnetlink.c:515
 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline]
 netlink_unicast+0x437/0x620 net/netlink/af_netlink.c:1313
 netlink_sendmsg+0x733/0xbe0 net/netlink/af_netlink.c:1878
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xc5/0x100 net/socket.c:656
 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c829
RSP: 002b:00007f03cb9d0c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004fe240 RCX: 000000000045c829
RDX: 0000000000000000 RSI: 0000000020000580 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000095e R14: 00000000004cc116 R15: 00007f03cb9d16d4
Code:  Bad RIP value.
RIP:           (null) RSP: ffff88804c61f268
CR2: 0000000000000000
---[ end trace 4a81eb200be7d4db ]---