BUG: sleeping function called from invalid context at arch/x86/mm/fault.c:1333 in_atomic(): 0, irqs_disabled(): 0, pid: 31262, name: syz-executor.5 3 locks held by syz-executor.5/31262: #0: 0000000078ff041e (&table[i].mutex){+.+.}, at: nfnl_lock net/netfilter/nfnetlink.c:62 [inline] #0: 0000000078ff041e (&table[i].mutex){+.+.}, at: nfnetlink_rcv_msg+0xa09/0xfcf net/netfilter/nfnetlink.c:223 #1: 00000000745ea991 (rcu_read_lock){....}, at: ctnetlink_create_conntrack+0x1bb/0x1300 net/netfilter/nf_conntrack_netlink.c:1926 #2: 000000000be511ae (&mm->mmap_sem){++++}, at: __do_page_fault+0x3c9/0xe90 arch/x86/mm/fault.c:1319 Preemption disabled at: [] rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1076 [inline] [] rcu_lockdep_current_cpu_online+0x37/0x1c0 kernel/rcu/tree.c:1068 CPU: 1 PID: 31262 Comm: syz-executor.5 Not tainted 4.19.96-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 ___might_sleep.cold+0x1bd/0x1f6 kernel/sched/core.c:6192 __might_sleep+0x95/0x190 kernel/sched/core.c:6145 __do_page_fault+0x3f4/0xe90 arch/x86/mm/fault.c:1333 do_page_fault+0x71/0x57d arch/x86/mm/fault.c:1465 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1204 RIP: 0010:0x40 Code: Bad RIP value. RSP: 0018:ffff888014bcf140 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000ae96000 RDX: 1ffff11042c0386f RSI: ffff888014bcf180 RDI: ffff888014bcf1d0 RBP: ffff888014bcf268 R08: ffff888029ad6180 R09: ffff888014bcf1d0 R10: ffffed1002979e3f R11: ffff888014bcf1ff R12: ffff8880a02cf040 R13: 0000000000000000 R14: 0000000000000001 R15: ffff88821601c340 BUG: unable to handle kernel NULL pointer dereference at 0000000000000040 PGD 49e06067 P4D 49e06067 PUD 1526d067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 31262 Comm: syz-executor.5 Tainted: G W 4.19.96-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:0x40 Code: Bad RIP value. RSP: 0018:ffff888014bcf140 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000ae96000 RDX: 1ffff11042c0386f RSI: ffff888014bcf180 RDI: ffff888014bcf1d0 RBP: ffff888014bcf268 R08: ffff888029ad6180 R09: ffff888014bcf1d0 R10: ffffed1002979e3f R11: ffff888014bcf1ff R12: ffff8880a02cf040 R13: 0000000000000000 R14: 0000000000000001 R15: ffff88821601c340 FS: 00007f00bf71b700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000016 CR3: 0000000049e07000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ctnetlink_parse_nat_setup+0xc5/0x660 net/netfilter/nf_conntrack_netlink.c:1518 ctnetlink_setup_nat net/netfilter/nf_conntrack_netlink.c:1588 [inline] ctnetlink_create_conntrack+0x4ea/0x1300 net/netfilter/nf_conntrack_netlink.c:1981 ctnetlink_new_conntrack+0x527/0xe50 net/netfilter/nf_conntrack_netlink.c:2111 nfnetlink_rcv_msg+0xd0d/0xfcf net/netfilter/nfnetlink.c:228 netlink_rcv_skb+0x17d/0x460 net/netlink/af_netlink.c:2454 nfnetlink_rcv+0x1c0/0x460 net/netfilter/nfnetlink.c:560 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x53a/0x730 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:632 ___sys_sendmsg+0x803/0x920 net/socket.c:2115 __sys_sendmsg+0x105/0x1d0 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2160 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45aff9 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f00bf71ac78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f00bf71b6d4 RCX: 000000000045aff9 RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000008bd R14: 00000000004c9d78 R15: 000000000075bf2c Modules linked in: CR2: 0000000000000040 netlink: 'syz-executor.0': attribute type 5 has an invalid length. ---[ end trace 338fca68783d4be2 ]--- RIP: 0010:0x40 Code: Bad RIP value. RSP: 0018:ffff888014bcf140 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000ae96000 RDX: 1ffff11042c0386f RSI: ffff888014bcf180 RDI: ffff888014bcf1d0 RBP: ffff888014bcf268 R08: ffff888029ad6180 R09: ffff888014bcf1d0 R10: ffffed1002979e3f R11: ffff888014bcf1ff R12: ffff8880a02cf040 R13: 0000000000000000 R14: 0000000000000001 R15: ffff88821601c340 FS: 00007f00bf71b700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2c823000 CR3: 0000000049e07000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400