BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
PGD 1bb795067 P4D 1bb795067 PUD 1aeea8067 PMD 0 
Oops: 0010 [#1] SMP KASAN
CPU: 0 PID: 3822 Comm: syz-executor6 Not tainted 4.18.0-rc4-next-20180712+ #5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:          (null)
Code: Bad RIP value.
RSP: 0018:ffff8801c8dbf300 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff81a1b96d
RDX: 1ffff1003986a256 RSI: ffff8801c8dbf580 RDI: ffff8801cc3512b0
RBP: ffff8801c8dbf4f0 R08: ffff8801cfe3e0c0 R09: ffff8801c8dbef68
R10: ffffed003982a408 R11: ffff8801cc152047 R12: ffff8801c8dbf580
R13: ffff8801cc3512b0 R14: ffff8801cc3512d8 R15: 0000000000000080
FS:  00000000022f4940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001cacd4000 CR4: 00000000001406f0
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: 0033:0x40b3a0
Code: 89 f8 49 8b 34 c6 4a 8d 04 2e 48 3d ff ff ff 7e 0f 86 74 ff ff ff bf a7 b1 4b 00 31 c0 e8 38 5e ff ff 31 ff e8 61 5b ff ff 90 <89> 3c b5 20 00 72 00 eb b6 31 ed 0f 1f 44 00 00 80 3d 6e 4c 52 00 
RSP: 002b:00007fff32623dc0 EFLAGS: 00010246
RAX: 000000003b52bffa RBX: 000000008d4c8d55 RCX: 0000001b2fc20000
RDX: 0000000000000000 RSI: 0000000000001ffa RDI: ffffffff3b52bffa
RBP: 00000000000000a4 R08: 000000003b52bffa R09: 000000003b52bffe
R10: 00007fff32623e50 R11: 0000000000000246 R12: 000000000072bea0
R13: 0000000080000000 R14: 00007f3d6a30b008 R15: 000000000000240f
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: 0000000000000000
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
---[ end trace 116d1be46c4c57e7 ]---
PGD 1d90aa067 P4D 1d90aa067 PUD 1c8e7b067 PMD 0 
RIP: 0010:          (null)
Oops: 0010 [#2] SMP KASAN
CPU: 1 PID: 3826 Comm: syz-executor3 Tainted: G      D           4.18.0-rc4-next-20180712+ #5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Code: 
RIP: 0010:          (null)
Code: Bad RIP value.
Bad RIP value.
RSP: 0018:ffff88019af37278 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffc90008b02000
RDX: 1ffff1003986a256 RSI: ffff88019af374f8 RDI: ffff8801cc3512b0
RSP: 0018:ffff8801c8dbf300 EFLAGS: 00010246
RBP: ffff88019af37468 R08: ffff88019dfc0440 R09: ffffed0039835898
R10: ffffed0039835898 R11: ffff8801cc1ac4c7 R12: ffff88019af374f8
R13: ffff8801cc3512b0 R14: ffff8801cc3512d8 R15: 0000000000000080
FS:  00007f23921f5700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff81a1b96d
CR2: ffffffffffffffd6 CR3: 00000001c5688000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
RDX: 1ffff1003986a256 RSI: ffff8801c8dbf580 RDI: ffff8801cc3512b0
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
RBP: ffff8801c8dbf4f0 R08: ffff8801cfe3e0c0 R09: ffff8801c8dbef68
R10: ffffed003982a408 R11: ffff8801cc152047 R12: ffff8801c8dbf580
R13: ffff8801cc3512b0 R14: ffff8801cc3512d8 R15: 0000000000000080
FS:  00000000022f4940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
 shrink_slab_memcg mm/vmscan.c:598 [inline]
 shrink_slab+0x861/0xa60 mm/vmscan.c:671
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001cacd4000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 shrink_node+0x429/0x16a0 mm/vmscan.c:2735
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400