BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
PGD 19e7f3067 P4D 19e7f3067 PUD 19e7f4067 PMD 0 
Oops: 0010 [#1] SMP KASAN
CPU: 1 PID: 1535 Comm: kswapd0 Not tainted 4.18.0-rc4-next-20180713+ #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:          (null)
Code: Bad RIP value.
RSP: 0018:ffff8801d3e3f310 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff81a1ba2d
RDX: 1ffff10036ceea7e RSI: ffff8801d3e3f590 RDI: ffff8801b67753f0
RBP: ffff8801d3e3f500 R08: ffff8801d3e46180 R09: ffffed003ae38520
R10: ffffed003ae38520 R11: ffff8801d71c2907 R12: ffff8801d3e3f590
R13: ffff8801b67753f0 R14: ffff8801b6775418 R15: 0000000000000080
FS:  0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000019e7f2000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 shrink_slab_memcg mm/vmscan.c:598 [inline]
 shrink_slab+0x861/0xa60 mm/vmscan.c:671
 shrink_node+0x429/0x16a0 mm/vmscan.c:2735
 kswapd_shrink_node mm/vmscan.c:3457 [inline]
 balance_pgdat+0x7ca/0x1010 mm/vmscan.c:3567
 kswapd+0x82e/0x12f0 mm/vmscan.c:3789
 kthread+0x345/0x410 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: 0000000000000000
---[ end trace e7f569336fe24f82 ]---
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
PGD 1d664e067 
RIP: 0010:          (null)
P4D 1d664e067 
Code: 
PUD 1a0410067 
Bad RIP value.
PMD 0 
RSP: 0018:ffff8801d3e3f310 EFLAGS: 00010246
Oops: 0010 [#2] SMP KASAN
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff81a1ba2d
CPU: 0 PID: 546 Comm: syz-executor6 Tainted: G      D           4.18.0-rc4-next-20180713+ #7
RDX: 1ffff10036ceea7e RSI: ffff8801d3e3f590 RDI: ffff8801b67753f0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RBP: ffff8801d3e3f500 R08: ffff8801d3e46180 R09: ffffed003ae38520
RIP: 0010:          (null)
R10: ffffed003ae38520 R11: ffff8801d71c2907 R12: ffff8801d3e3f590
Code: 
R13: ffff8801b67753f0 R14: ffff8801b6775418 R15: 0000000000000080
Bad RIP value.
FS:  0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
RSP: 0018:ffff88018f6860b0 EFLAGS: 00010246
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff81a1ba2d
CR2: ffffffffffffffd6 CR3: 000000019e7f2000 CR4: 00000000001406e0
RDX: 1ffff10036ceea7e RSI: ffff88018f686330 RDI: ffff8801b67753f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
RBP: ffff88018f6862a0 R08: ffff8801928c8740 R09: ffffed003ae38520
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
R10: ffffed003ae38520 R11: ffff8801d71c2907 R12: ffff88018f686330