------------[ cut here ]------------
skb_assert_len
WARNING: ./include/linux/skbuff.h:2753 at skb_assert_len include/linux/skbuff.h:2753 [inline], CPU#2: syz.8.1517/11091
WARNING: ./include/linux/skbuff.h:2753 at __dev_queue_xmit+0x21bc/0x4970 net/core/dev.c:4781, CPU#2: syz.8.1517/11091
Modules linked in:
CPU: 2 UID: 0 PID: 11091 Comm: syz.8.1517 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 8b 71 7d f8 48 8d 3d 54 69 a3 07 48 c7 c6 20 90 16 8d <67> 48 0f b9 3a 44 0f b6 25 e6 6e 7c 07 31 ff 44 89 e6 e8 76 6b 7d
RSP: 0018:ffffc90005a2f838 EFLAGS: 00010283
RAX: 0000000000000168 RBX: ffff888038c137c0 RCX: ffffc90036505000
RDX: 0000000000080000 RSI: ffffffff8d169020 RDI: ffffffff91305cb0
RBP: ffff888038c137d0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88802eb7c9c0
R13: 0000000000000000 R14: 0000000000000000 R15: ffff888038c13874
FS:  00007f55916436c0(0000) GS:ffff8880d5fec000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5591642ff8 CR3: 0000000056700000 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]
 __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2255
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f559079e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5591643028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f5590a25fa0 RCX: 00007f559079e0d9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f5590835024 R08: 0000200000000000 R09: 0000000000000014
R10: 0000000004000010 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5590a26038 R14: 00007f5590a25fa0 R15: 00007ffc52c31378
 </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 8b 71 7d f8       	call   0xf87d71a7
  1c:	48 8d 3d 54 69 a3 07 	lea    0x7a36954(%rip),%rdi        # 0x7a36977
  23:	48 c7 c6 20 90 16 8d 	mov    $0xffffffff8d169020,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	44 0f b6 25 e6 6e 7c 	movzbl 0x77c6ee6(%rip),%r12d        # 0x77c6f1d
  36:	07
  37:	31 ff                	xor    %edi,%edi
  39:	44 89 e6             	mov    %r12d,%esi
  3c:	e8                   	.byte 0xe8
  3d:	76 6b                	jbe    0xaa
  3f:	7d                   	.byte 0x7d