BUG: unable to handle kernel NULL pointer dereference at 00000000000000c8
kasan: CONFIG_KASAN_INLINE enabled
PGD 19677d067 
kasan: GPF could be caused by NULL-ptr deref or user memory access
P4D 19677d067 PUD 19677e067 PMD 0 
Oops: 0002 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 4540 Comm: syz-executor0 Not tainted 4.17.0-rc7+ #97
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:kasan_mem_to_shadow include/linux/kasan.h:28 [inline]
RIP: 0010:kasan_poison_shadow mm/kasan/kasan.c:61 [inline]
RIP: 0010:kasan_unpoison_shadow+0x5/0x50 mm/kasan/kasan.c:69
RSP: 0018:ffff8801960370f0 EFLAGS: 00010207
RAX: 00000000000000c8 RBX: ffff8801c31354e8 RCX: 00000000014000c0
RDX: 00000000000000c8 RSI: 000000004197ceb8 RDI: ffff8801c3135420
RBP: ffff880196037130 R08: ffff8801ae9c8bb8 R09: 0000000000000006
R10: ffff8801ae9c8380 R11: 0000000000000000 R12: ffff8801c3135420
R13: ffff8801cec89c80 R14: ffff8801c31354e7 R15: ffff8801c31354e7
FS:  0000000000000000(0000) GS:ffff8801daf00000(0063) knlGS:0000000009c43900
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000000000c8 CR3: 000000019677c000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
 slab_post_alloc_hook mm/slab.h:444 [inline]
 slab_alloc mm/slab.c:3392 [inline]
 kmem_cache_alloc+0x11b/0x760 mm/slab.c:3552
 dup_mmap kernel/fork.c:450 [inline]
 dup_mm kernel/fork.c:1234 [inline]
 copy_mm kernel/fork.c:1288 [inline]
 copy_process.part.38+0x2d10/0x6e70 kernel/fork.c:1794
 copy_process kernel/fork.c:1607 [inline]
 _do_fork+0x291/0x12a0 kernel/fork.c:2088
 __do_compat_sys_x86_clone arch/x86/ia32/sys_ia32.c:240 [inline]
 __se_compat_sys_x86_clone arch/x86/ia32/sys_ia32.c:236 [inline]
 __ia32_compat_sys_x86_clone+0xbc/0x140 arch/x86/ia32/sys_ia32.c:236
 do_syscall_32_irqs_on arch/x86/entry/common.c:323 [inline]
 do_fast_syscall_32+0x345/0xf9b arch/x86/entry/common.c:394
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7fe2cb9
RSP: 002b:000000000845ea80 EFLAGS: 00000246 ORIG_RAX: 0000000000000078
RAX: ffffffffffffffda RBX: 0000000001200011 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000009c43968
RBP: 000000000845ead8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Code: 78 ec 8d 01 88 ff ff c0 00 40 01 00 00 00 00 50 78 ec 8d 01 88 ff ff 68 78 ec 8d 01 88 ff ff 0b 00 00 00 00 00 00 00 53 a6 1b 37 <00> 00 00 00 f4 8d 9b 9b 00 00 00 00 b0 77 b0 ac 01 88 ff ff 47 
RIP: kasan_mem_to_shadow include/linux/kasan.h:28 [inline] RSP: ffff8801960370f0
RIP: kasan_poison_shadow mm/kasan/kasan.c:61 [inline] RSP: ffff8801960370f0
RIP: kasan_unpoison_shadow+0x5/0x50 mm/kasan/kasan.c:69 RSP: ffff8801960370f0
CR2: 00000000000000c8
general protection fault: 0000 [#2] SMP KASAN
---[ end trace 67c42095e6a5daef ]---
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in: