RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 00000000004512e9
RDX: 0000000020002000 RSI: 000000000000890b RDI: 0000000000000005
RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004b5e76
R13: 00007fb1403f2b48 R14: 00000000004b5e86 R15: 0000000000000000
BUG: unable to handle kernel NULL pointer dereference at 0000000000000040
IP: free_fib_info_rcu+0x31d/0x3e0 net/ipv4/fib_semantics.c:223
PGD 1c6eb7067 
P4D 1c6eb7067 
PUD 1c272f067 
PMD 0 

Oops: 0002 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 27572 Comm: syz-executor7 Not tainted 4.13.0-rc4+ #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d55fa6c0 task.stack: ffff8801d4898000
RIP: 0010:free_fib_info_rcu+0x31d/0x3e0 net/ipv4/fib_semantics.c:223
RSP: 0000:ffff8801db207a68 EFLAGS: 00010206
RAX: ffff8801d55fa6c0 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000100 RSI: ffff8801caa4edc0 RDI: ffff8801caa4ee08
RBP: ffff8801db207ac8 R08: 0000000000000000 R09: 0000000000000002
R10: ffff8801db2079a8 R11: ffffffff815c8be2 R12: ffff8801db207d48
R13: ffff8801caa4ee20 R14: dffffc0000000000 R15: ffff8801db207d88
FS:  0000000002921940(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000040 CR3: 00000001cce74000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __rcu_reclaim kernel/rcu/rcu.h:195 [inline]
 rcu_do_batch kernel/rcu/tree.c:2777 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:3031 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2998 [inline]
 rcu_process_callbacks+0xd3e/0x17b0 kernel/rcu/tree.c:3015
 __do_softirq+0x2f5/0xba3 kernel/softirq.c:284
 invoke_softirq kernel/softirq.c:364 [inline]
 irq_exit+0x1cc/0x200 kernel/softirq.c:405
 exiting_irq arch/x86/include/asm/apic.h:638 [inline]
 smp_apic_timer_interrupt+0x76/0xa0 arch/x86/kernel/apic/apic.c:1044
 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:702
RIP: 0033:0x405878
RSP: 002b:0000000000a6f8b0 EFLAGS: 00000216 ORIG_RAX: ffffffffffffff10
RAX: 00000000e7fe47a7 RBX: 0000000000718000 RCX: 0000000000000857
RDX: 000000000000816e RSI: 00000000000007a7 RDI: 00000000e7fe47a7
RBP: 00000000668a21bc R08: 00000000cec0885a R09: 0000000300053d5d
R10: 0000000000a6f980 R11: 0000000000000206 R12: 00007fb140b99218
R13: 000000000000025b R14: 00007fb140bf4000 R15: 00007fb140b74000
 </IRQ>
Code: 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 46 48 8b 45 a8 48 8b 58 f0 48 81 fb 80 d2 40 85 74 18 e8 b3 84 56 fd <f0> ff 4b 40 75 0d e8 a8 84 56 fd 48 89 df e8 90 a2 89 fd e8 9b 
RIP: free_fib_info_rcu+0x31d/0x3e0 net/ipv4/fib_semantics.c:223 RSP: ffff8801db207a68
CR2: 0000000000000040
---[ end trace 01dfd3160d01294a ]---