------------[ cut here ]------------
skb_assert_len
WARNING: ./include/linux/skbuff.h:2753 at skb_assert_len include/linux/skbuff.h:2753 [inline], CPU#3: syz.0.2482/13345
WARNING: ./include/linux/skbuff.h:2753 at __dev_queue_xmit+0x21bc/0x4970 net/core/dev.c:4781, CPU#3: syz.0.2482/13345
Modules linked in:
CPU: 3 UID: 0 PID: 13345 Comm: syz.0.2482 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:skb_assert_len include/linux/skbuff.h:2753 [inline]
RIP: 0010:__dev_queue_xmit+0x21c3/0x4970 net/core/dev.c:4781
Code: 41 b8 01 00 00 00 31 d2 31 f6 48 89 df e8 95 7f f8 ff e9 b3 e0 ff ff e8 cb 55 7f f8 48 8d 3d 14 3a a6 07 48 c7 c6 e0 6f 16 8d <67> 48 0f b9 3a 44 0f b6 25 f1 1e 7f 07 31 ff 44 89 e6 e8 b6 4f 7f
RSP: 0000:ffffc900068c7820 EFLAGS: 00010287
RAX: 0000000000000199 RBX: ffff888025a9ab40 RCX: ffffc90007a32000
RDX: 0000000000080000 RSI: ffffffff8d166fe0 RDI: ffffffff9130a550
RBP: ffff888025a9ab50 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88806641d6c0
R13: 0000000000000000 R14: 0000000000000000 R15: ffff888025a9abf4
FS:  0000000000000000(0000) GS:ffff888096ef3000(0063) knlGS:00000000f547db40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f72aea06 CR3: 0000000064151000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 dev_queue_xmit include/linux/netdevice.h:3448 [inline]
 packet_xmit+0x243/0x310 net/packet/af_packet.c:276
 tpacket_snd net/packet/af_packet.c:2907 [inline]
 packet_sendmsg+0x28d6/0x4eb0 net/packet/af_packet.c:3134
 sock_sendmsg_nosec net/socket.c:775 [inline]
 __sock_sendmsg net/socket.c:790 [inline]
 __sys_sendto+0x48b/0x4e0 net/socket.c:2252
 __do_sys_sendto net/socket.c:2259 [inline]
 __se_sys_sendto net/socket.c:2255 [inline]
 __ia32_sys_sendto+0xdd/0x1b0 net/socket.c:2255
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xe7/0x970 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf708efec
Code: Unable to access opcode bytes at 0xf708efc2.
RSP: 002b:00000000f547d50c EFLAGS: 00000292 ORIG_RAX: 0000000000000171
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000004000010 RDI: 0000000080000000
RBP: 0000000000000014 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	41 b8 01 00 00 00    	mov    $0x1,%r8d
   6:	31 d2                	xor    %edx,%edx
   8:	31 f6                	xor    %esi,%esi
   a:	48 89 df             	mov    %rbx,%rdi
   d:	e8 95 7f f8 ff       	call   0xfff87fa7
  12:	e9 b3 e0 ff ff       	jmp    0xffffe0ca
  17:	e8 cb 55 7f f8       	call   0xf87f55e7
  1c:	48 8d 3d 14 3a a6 07 	lea    0x7a63a14(%rip),%rdi        # 0x7a63a37
  23:	48 c7 c6 e0 6f 16 8d 	mov    $0xffffffff8d166fe0,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	44 0f b6 25 f1 1e 7f 	movzbl 0x77f1ef1(%rip),%r12d        # 0x77f1f28
  36:	07
  37:	31 ff                	xor    %edi,%edi
  39:	44 89 e6             	mov    %r12d,%esi
  3c:	e8                   	.byte 0xe8
  3d:	b6 4f                	mov    $0x4f,%dh
  3f:	7f                   	.byte 0x7f