BUG: sleeping function called from invalid context at arch/x86/mm/fault.c:1385
in_atomic(): 0, irqs_disabled(): 0, pid: 21513, name: syz-executor.2
3 locks held by syz-executor.2/21513:
 #0:  (&table[i].mutex){+.+.}, at: [<ffffffff85333ac6>] nfnl_lock net/netfilter/nfnetlink.c:61 [inline]
 #0:  (&table[i].mutex){+.+.}, at: [<ffffffff85333ac6>] nfnetlink_rcv_msg+0x726/0xc00 net/netfilter/nfnetlink.c:209
 #1:  (rcu_read_lock){....}, at: [<ffffffff85383156>] ctnetlink_create_conntrack+0x166/0x1050 net/netfilter/nf_conntrack_netlink.c:1785
 #2:  (&mm->mmap_sem){++++}, at: [<ffffffff8128ee7a>] __do_page_fault+0x2fa/0xb50 arch/x86/mm/fault.c:1371
Preemption disabled at:
[<          (null)>]           (null)
CPU: 1 PID: 21513 Comm: syz-executor.2 Not tainted 4.14.191-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+0x1b2/0x283 lib/dump_stack.c:58
 ___might_sleep.cold+0x235/0x250 kernel/sched/core.c:6042
 __do_page_fault+0x31d/0xb50 arch/x86/mm/fault.c:1385
 page_fault+0x25/0x50 arch/x86/entry/entry_64.S:1123
RIP: 0010:          (null)
RSP: 0018:ffff888033c67228 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff888033c672f0 RCX: ffffc900060f5000
RDX: 1ffffffff0e7a6f7 RSI: ffff888033c672a0 RDI: ffff888033c672f0
RBP: ffff888052afc900 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: ffffffff873d3780 R15: ffff888033c672a0
BUG: unable to handle kernel NULL pointer dereference at           (null)
IP:           (null)
PGD 5e663067 P4D 5e663067 PUD 5e662067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 21513 Comm: syz-executor.2 Tainted: G        W       4.14.191-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888053fde080 task.stack: ffff888033c60000
RIP: 0010:          (null)
RSP: 0018:ffff888033c67228 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff888033c672f0 RCX: ffffc900060f5000
RDX: 1ffffffff0e7a6f7 RSI: ffff888033c672a0 RDI: ffff888033c672f0
RBP: ffff888052afc900 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: ffffffff873d3780 R15: ffff888033c672a0
FS:  00007fe21d92f700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31c21000 CR3: 000000003cad4000 CR4: 00000000001406e0
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+0x1f3/0x560 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:1491 [inline]
 ctnetlink_create_conntrack+0x43b/0x1050 net/netfilter/nf_conntrack_netlink.c:1840
 ctnetlink_new_conntrack+0x457/0xbf0 net/netfilter/nf_conntrack_netlink.c:1964
 nfnetlink_rcv_msg+0x9bb/0xc00 net/netfilter/nfnetlink.c:214
 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2433
 nfnetlink_rcv+0x1ab/0x1da0 net/netfilter/nfnetlink.c:515
 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline]
 netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1313
 netlink_sendmsg+0x62e/0xb80 net/netlink/af_netlink.c:1878
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 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+0x46/0xbb
RIP: 0033:0x45cc79
RSP: 002b:00007fe21d92ec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000028540 RCX: 000000000045cc79
RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000003
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffd59e98ecf R14: 00007fe21d92f9c0 R15: 000000000078bf0c
Code:  Bad RIP value.
RIP:           (null) RSP: ffff888033c67228
CR2: 0000000000000000
---[ end trace 8257f1438b0b3aa6 ]---