------------[ cut here ]------------
kernel BUG at net/ipv4/tcp_output.c:2817!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 2951 Comm: syz-fuzzer Not tainted 4.13.0-rc7+ #36
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d2cc8440 task.stack: ffff8801d2df0000
RIP: 0010:__tcp_retransmit_skb+0x1d18/0x1fa0 net/ipv4/tcp_output.c:2817
RSP: 0000:ffff8801db307408 EFLAGS: 00010206
RAX: ffff8801d2cc8440 RBX: 0000000000000001 RCX: 0000000086c1a76a
RDX: 0000000000000100 RSI: ffff8801c8822080 RDI: ffff8801c88220ac
RBP: ffff8801db3075c8 R08: ffff88021fff905c R09: ffff88021fff9048
R10: 0000000000000000 R11: ffff88021fff905d R12: ffff8801c8822106
R13: 0000000086c1aafa R14: ffff8801c8822080 R15: ffff8801c55b0000
FS:  00007f612d830700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001866cd8 CR3: 00000001d0743000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 tcp_retransmit_skb+0x2e/0x230 net/ipv4/tcp_output.c:2891
 tcp_retransmit_timer+0xcee/0x2a10 net/ipv4/tcp_timer.c:476
 tcp_write_timer_handler+0x335/0x810 net/ipv4/tcp_timer.c:561
 tcp_write_timer+0x146/0x160 net/ipv4/tcp_timer.c:579
 call_timer_fn+0x233/0x830 kernel/time/timer.c:1281
 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+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: 0033:0x40ef7f
RSP: 002b:000000c420292ad0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: 00000000007e47e0 RBX: aa64115000000000 RCX: 00000000007e9800
RDX: 00000000aa641150 RSI: 00000000aa641150 RDI: 0000000000000000
RBP: 000000c420292b58 R08: 0000000000a75ce0 R09: 0000000000a75c20
R10: 000000c42f8f42c0 R11: 000000c42f645128 R12: 000000c42f6450e0
R13: 0000000000000001 R14: 000000c42f645128 R15: 0000000000000002
 </IRQ>
Code: ff e8 6d f9 94 fd e9 4b fb ff ff 48 8b bd a0 fe ff ff e8 bc f9 94 fd e9 fc f8 ff ff e8 b2 f9 94 fd e9 53 f6 ff ff e8 18 08 61 fd <0f> 0b e8 a1 f9 94 fd e9 9e e5 ff ff 4c 89 e7 e8 34 f9 94 fd e9 
RIP: __tcp_retransmit_skb+0x1d18/0x1fa0 net/ipv4/tcp_output.c:2817 RSP: ffff8801db307408
---[ end trace 1514f61f2cac574c ]---