netlink: 72 bytes leftover after parsing attributes in process `syz.3.26305'.
------------[ cut here ]------------
1
WARNING: net/ipv4/route.c:1275 at ip_rt_bug+0x2b/0x150 net/ipv4/route.c:1275, CPU#3: syz.3.26305/28050
Modules linked in:
CPU: 3 UID: 0 PID: 28050 Comm: syz.3.26305 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:ip_rt_bug+0x2b/0x150 net/ipv4/route.c:1275
Code: 0f 1e fa 41 54 55 53 48 89 d3 48 83 ec 08 e8 0c 47 32 f8 66 90 e8 05 47 32 f8 ba 02 00 00 00 48 89 de 31 ff e8 26 d6 6e ff 90 <0f> 0b 90 48 83 c4 08 31 c0 5b 5d 41 5c c3 cc cc cc cc e8 de 46 32
RSP: 0000:ffffc9000fcb73a0 EFLAGS: 00010283
RAX: 0000000000000e85 RBX: ffff88802824aa00 RCX: ffffc90027ae9000
RDX: 0000000000080000 RSI: ffffffff8942dea4 RDI: ffffffff8bfa35a0
RBP: ffff88802824aa00 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc9000fcb7350 R11: 0000000000000000 R12: ffff8880534a25c0
R13: ffff888040b95280 R14: ffff888060fc1a30 R15: ffff88802824aa58
FS:  0000000000000000(0000) GS:ffff8880976e2000(0063) knlGS:00000000f54b6b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f744d02c CR3: 00000000726b7000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 dst_output include/net/dst.h:464 [inline]
 dst_output include/net/dst.h:462 [inline]
 ip_local_out net/ipv4/ip_output.c:131 [inline]
 ip_send_skb net/ipv4/ip_output.c:1508 [inline]
 ip_push_pending_frames+0x3eb/0x5c0 net/ipv4/ip_output.c:1528
 icmp_push_reply+0x30e/0x450 net/ipv4/icmp.c:395
 __icmp_send+0x1184/0x2c00 net/ipv4/icmp.c:972
 icmp_send include/net/icmp.h:43 [inline]
 ip_options_compile+0xb6/0x100 net/ipv4/ip_options.c:473
 ip_rcv_options net/ipv4/ip_input.c:290 [inline]
 ip_rcv_finish_core+0x6af/0x2220 net/ipv4/ip_input.c:391
 ip_rcv_finish net/ipv4/ip_input.c:451 [inline]
 NF_HOOK include/linux/netfilter.h:318 [inline]
 NF_HOOK include/linux/netfilter.h:312 [inline]
 ip_rcv+0x1c0/0x5d0 net/ipv4/ip_input.c:573
 __netif_receive_skb_one_core+0x197/0x1e0 net/core/dev.c:6152
 __netif_receive_skb+0x1f/0x120 net/core/dev.c:6265
 netif_receive_skb_internal net/core/dev.c:6351 [inline]
 netif_receive_skb+0x139/0x760 net/core/dev.c:6410
 tun_rx_batched.isra.0+0x3f6/0x750 drivers/net/tun.c:1509
 tun_get_user+0x1e2e/0x3e10 drivers/net/tun.c:1953
 tun_chr_write_iter+0xdc/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x6ac/0x1070 fs/read_write.c:686
 ksys_write+0x12a/0x250 fs/read_write.c:738
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 do_int80_emulation+0x101/0x470 arch/x86/entry/syscall_32.c:172
 asm_int80_emulation+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
RIP: 0023:0xf71f572b
Code: 57 56 53 8b 44 24 14 f6 00 08 75 23 8b 44 24 18 8b 5c 24 1c 8b 4c 24 20 8b 54 24 24 8b 74 24 28 8b 7c 24 2c 8b 6c 24 30 cd 80 <5b> 5e 5f 5d c3 5b 5e 5f 5d e9 f7 a1 ff ff 66 90 66 90 66 90 90 53
RSP: 002b:00000000f54b644c EFLAGS: 00000246 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 00000000000000c8 RCX: 0000000080000000
RDX: 000000000000003e RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	57                   	push   %rdi
   1:	56                   	push   %rsi
   2:	53                   	push   %rbx
   3:	8b 44 24 14          	mov    0x14(%rsp),%eax
   7:	f6 00 08             	testb  $0x8,(%rax)
   a:	75 23                	jne    0x2f
   c:	8b 44 24 18          	mov    0x18(%rsp),%eax
  10:	8b 5c 24 1c          	mov    0x1c(%rsp),%ebx
  14:	8b 4c 24 20          	mov    0x20(%rsp),%ecx
  18:	8b 54 24 24          	mov    0x24(%rsp),%edx
  1c:	8b 74 24 28          	mov    0x28(%rsp),%esi
  20:	8b 7c 24 2c          	mov    0x2c(%rsp),%edi
  24:	8b 6c 24 30          	mov    0x30(%rsp),%ebp
  28:	cd 80                	int    $0x80
* 2a:	5b                   	pop    %rbx <-- trapping instruction
  2b:	5e                   	pop    %rsi
  2c:	5f                   	pop    %rdi
  2d:	5d                   	pop    %rbp
  2e:	c3                   	ret
  2f:	5b                   	pop    %rbx
  30:	5e                   	pop    %rsi
  31:	5f                   	pop    %rdi
  32:	5d                   	pop    %rbp
  33:	e9 f7 a1 ff ff       	jmp    0xffffa22f
  38:	66 90                	xchg   %ax,%ax
  3a:	66 90                	xchg   %ax,%ax
  3c:	66 90                	xchg   %ax,%ax
  3e:	90                   	nop
  3f:	53                   	push   %rbx