BUG: unable to handle kernel NULL pointer dereference at           (null)
IP:           (null)
PGD 51de8067 P4D 51de8067 PUD 69412067 PMD 0 
Oops: 0010 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 3 PID: 27420 Comm: syz-executor1 Not tainted 4.13.0-next-20170915+ #5
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff8800508ce500 task.stack: ffff880050b70000
RIP: 0010:          (null)
RSP: 0000:ffff88006df07780 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 1ffff1000dbe0ef6 RCX: 0000000000000000
RDX: 0000000000000100 RSI: ffffffff85b38320 RDI: 0000000000000000
RBP: ffff88006df07958 R08: ffff88006df070f0 R09: ffff88006df070e8
R10: ffff88006df07060 R11: 1ffff1000a119f33 R12: ffff88006df07930
R13: ffff880050c4bc00 R14: 0000000000000100 R15: ffff88006df078d0
FS:  0000000001b92940(0000) GS:ffff88006df00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000509d1000 CR4: 00000000000026e0
DR0: 0000000020000000 DR1: 0000000020001000 DR2: 0000000020001000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 expire_timers kernel/time/timer.c:1320 [inline]
 __run_timers+0x7fd/0xb90 kernel/time/timer.c:1620
 run_timer_softirq+0x4c/0xb0 kernel/time/timer.c:1646
 __do_softirq+0x2bb/0xbd0 kernel/softirq.c:284
 invoke_softirq kernel/softirq.c:364 [inline]
 irq_exit+0x1d3/0x210 kernel/softirq.c:405
 exiting_irq arch/x86/include/asm/apic.h:638 [inline]
 smp_apic_timer_interrupt+0x177/0x710 arch/x86/kernel/apic/apic.c:1048
 apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:577
 </IRQ>
RIP: 0033:0x4062e3
RSP: 002b:0000000000a5f8d0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 000000002000a074
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000a5f970 R11: 0000000000000246 R12: fffffffffffffffe
R13: 0000000000000002 R14: 000000000000000a R15: 000000002000a074
Code:  Bad RIP value.
RIP:           (null) RSP: ffff88006df07780
CR2: 0000000000000000
---[ end trace c7e12decc2a68f00 ]---