netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'. BUG: sleeping function called from invalid context at arch/x86/mm/fault.c:1355 in_atomic(): 0, irqs_disabled(): 0, pid: 11751, name: syz-executor.5 3 locks held by syz-executor.5/11751: #0: 00000000453d00a6 (&table[i].mutex){+.+.}, at: nfnl_lock net/netfilter/nfnetlink.c:62 [inline] #0: 00000000453d00a6 (&table[i].mutex){+.+.}, at: nfnetlink_rcv_msg+0xa13/0xf50 net/netfilter/nfnetlink.c:223 #1: 000000009414569b (rcu_read_lock){....}, at: ctnetlink_create_conntrack+0x199/0x12b0 net/netfilter/nf_conntrack_netlink.c:1929 #2: 00000000e7e725e5 (&mm->mmap_sem){++++}, at: __do_page_fault+0x3e2/0xde0 arch/x86/mm/fault.c:1341 Preemption disabled at: [] wake_up_klogd+0x14/0xc0 kernel/printk/printk.c:2916 CPU: 0 PID: 11751 Comm: syz-executor.5 Not tainted 4.19.125-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+0x1fc/0x2fe lib/dump_stack.c:118 ___might_sleep.cold+0x230/0x24b kernel/sched/core.c:6192 __do_page_fault+0x40d/0xde0 arch/x86/mm/fault.c:1355 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1205 RIP: 0010: (null) Code: Bad RIP value. RSP: 0018:ffff888091f271d0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc900104f9000 RDX: 1ffffffff101f1d3 RSI: ffff888091f27210 RDI: ffff888091f27260 RBP: ffff888091d4c200 R08: ffff888094128280 R09: ffffed1015cc5081 R10: ffffed1015cc5080 R11: ffff8880ae628407 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff880f8e60 R15: ffff888091f27210 audit: type=1800 audit(1591071192.754:90): pid=11753 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="syz-executor.4" name="dlm-monitor" dev="sda1" ino=15950 res=0 BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 PGD 9e978067 P4D 9e978067 PUD 8e6ac067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 11751 Comm: syz-executor.5 Tainted: G W 4.19.125-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010: (null) Code: Bad RIP value. RSP: 0018:ffff888091f271d0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc900104f9000 RDX: 1ffffffff101f1d3 RSI: ffff888091f27210 RDI: ffff888091f27260 RBP: ffff888091d4c200 R08: ffff888094128280 R09: ffffed1015cc5081 R10: ffffed1015cc5080 R11: ffff8880ae628407 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff880f8e60 R15: ffff888091f27210 FS: 00007f9fa6bef700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000000a877d000 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:847 [inline] nfnetlink_parse_nat_setup+0x235/0x420 net/netfilter/nf_nat_core.c:884 ctnetlink_parse_nat_setup+0xb6/0x640 net/netfilter/nf_conntrack_netlink.c:1521 ctnetlink_setup_nat net/netfilter/nf_conntrack_netlink.c:1596 [inline] ctnetlink_create_conntrack+0x501/0x12b0 net/netfilter/nf_conntrack_netlink.c:1984 ctnetlink_new_conntrack+0x4f5/0xdd1 net/netfilter/nf_conntrack_netlink.c:2114 nfnetlink_rcv_msg+0xc6b/0xf50 net/netfilter/nfnetlink.c:228 netlink_rcv_skb+0x160/0x410 net/netlink/af_netlink.c:2455 nfnetlink_rcv+0x1b2/0x420 net/netfilter/nfnetlink.c:560 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x4d7/0x6a0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x6e3/0xcc0 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 ___sys_sendmsg+0x803/0x920 net/socket.c:2115 __sys_sendmsg+0xec/0x1b0 net/socket.c:2153 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca69 Code: 0d b7 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f9fa6beec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004fe780 RCX: 000000000045ca69 RDX: 0000000000000000 RSI: 0000000020000640 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000964 R14: 00000000004cc3cb R15: 00007f9fa6bef6d4 Modules linked in: CR2: 0000000000000000 ---[ end trace cc5c69552cad7b4e ]--- RIP: 0010: (null) Code: Bad RIP value. RSP: 0018:ffff888091f271d0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc900104f9000 RDX: 1ffffffff101f1d3 RSI: ffff888091f27210 RDI: ffff888091f27260 RBP: ffff888091d4c200 R08: ffff888094128280 R09: ffffed1015cc5081 R10: ffffed1015cc5080 R11: ffff8880ae628407 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff880f8e60 R15: ffff888091f27210 FS: 00007f9fa6bef700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000b90004 CR3: 00000000a877d000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600