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WARNING: net/ipv4/route.c:1275 at ip_rt_bug+0x2d/0x140, CPU#0: syz.0.617/7390
Modules linked in:
CPU: 0 UID: 0 PID: 7390 Comm: syz.0.617 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:ip_rt_bug+0x2d/0x140
Code: fa 55 41 57 41 56 41 55 41 54 53 48 89 d3 e8 da f9 b8 f7 66 90 e8 d3 f9 b8 f7 31 ff 48 89 de ba 02 00 00 00 e8 14 15 6a ff 90 <0f> 0b 90 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d e9 7f c2 a6 01 cc 49
RSP: 0018:ffffc900036f71e0 EFLAGS: 00010282
RAX: f3c81eea0f17b900 RBX: ffff888110ec2300 RCX: 0000000000000401
RDX: 0000000000000002 RSI: ffffffff8df015e1 RDI: ffffffff8c27d700
RBP: ffffc900036f74e0 R08: ffffffff901205b7 R09: 1ffffffff20240b6
R10: dffffc0000000000 R11: fffffbfff20240b7 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff888110ec2300 R15: dffffc0000000000
FS:  00007fabb8e9a6c0(0000) GS:ffff88818de4b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2900fc CR3: 0000000110ed8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 ip_push_pending_frames+0x8b/0x110
 __icmp_send+0x118d/0x1590
 ip_options_compile+0x80/0xb0
 ip_rcv_finish_core+0xaa2/0x1c00
 ip_rcv_finish+0x14c/0x2a0
 NF_HOOK+0x336/0x3c0
 netif_receive_skb+0x45b/0xc50
 tun_rx_batched+0x1de/0x790
 tun_get_user+0x2a78/0x3dd0
 tun_chr_write_iter+0x113/0x200
 vfs_write+0x61d/0xb90
 ksys_write+0x150/0x270
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fabb7f5d60e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007fabb8e99fb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fabb8e9a6c0 RCX: 00007fabb7f5d60e
RDX: 0000000000000046 RSI: 0000200000000400 RDI: 00000000000000c8
RBP: 00007fabb8032d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fabb8216038 R14: 00007fabb8215fa0 R15: 00007fff905ab848
 </TASK>
