BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
PGD 1ac032067 P4D 1ac032067 PUD 194ef4067 PMD 0 
Oops: 0010 [#1] SMP KASAN
CPU: 1 PID: 3553 Comm: syz-executor4 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: 0000:ffff88019e57f300 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff81a1ba2d
RDX: 1ffff1003986865e RSI: ffff88019e57f580 RDI: ffff8801cc3432f0
RBP: ffff88019e57f4f0 R08: ffff8801960f2240 R09: ffffed003983b588
R10: ffffed003983b588 R11: ffff8801cc1dac47 R12: ffff88019e57f580
R13: ffff8801cc3432f0 R14: ffff8801cc343318 R15: 0000000000000080
FS:  000000000180c940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000018e46a000 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
 shrink_zones mm/vmscan.c:2964 [inline]
 do_try_to_free_pages+0x3e7/0x1290 mm/vmscan.c:3026
 try_to_free_mem_cgroup_pages+0x49d/0xc90 mm/vmscan.c:3324
 reclaim_high.constprop.73+0x137/0x1e0 mm/memcontrol.c:2060
 mem_cgroup_handle_over_high+0x8d/0x130 mm/memcontrol.c:2085
 tracehook_notify_resume include/linux/tracehook.h:195 [inline]
 exit_to_usermode_loop+0x287/0x380 arch/x86/entry/common.c:166
 prepare_exit_to_usermode+0x342/0x3b0 arch/x86/entry/common.c:197
 retint_user+0x8/0x18
RIP: 0033:0x40d7ef
Code: 0f 84 c8 02 00 00 48 83 bd 78 ff ff ff 00 0f 84 f9 04 00 00 48 8b 95 68 ff ff ff 44 89 95 38 ff ff ff 4c 8d ac 10 00 f7 ff ff <49> 89 85 90 06 00 00 49 8d 85 10 03 00 00 49 89 95 98 06 00 00 41 
RSP: 002b:00007ffdc6734bf0 EFLAGS: 00010206
RAX: 00007fcf145ec000 RBX: 0000000000020000 RCX: 0000000000455b0a
RDX: 0000000000021000 RSI: 0000000000021000 RDI: 0000000000000000
RBP: 00007ffdc6734cd0 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdc6734ce0
R13: 00007fcf1460c700 R14: 000000000072bf6c R15: 0000000000000001
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: 0000000000000000
---[ end trace 46656a68bd9e6ae5 ]---
RIP: 0010:          (null)
Code: Bad RIP value.
RSP: 0000:ffff88019e57f300 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff81a1ba2d
RDX: 1ffff1003986865e RSI: ffff88019e57f580 RDI: ffff8801cc3432f0
RBP: ffff88019e57f4f0 R08: ffff8801960f2240 R09: ffffed003983b588
R10: ffffed003983b588 R11: ffff8801cc1dac47 R12: ffff88019e57f580
R13: ffff8801cc3432f0 R14: ffff8801cc343318 R15: 0000000000000080
FS:  000000000180c940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000018e46a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400