kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 6252 Comm: syz-executor.4 Not tainted 4.14.275-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880a15c22c0 task.stack: ffff88809a250000
RIP: 0010:dev_put include/linux/netdevice.h:3381 [inline]
RIP: 0010:llc_ui_autobind.isra.0+0x26b/0x390 net/llc/af_llc.c:320
RSP: 0018:ffff88809a257a78 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8880a9898dc0 RCX: ffffc9000761b000
RDX: 00000000000000a8 RSI: ffffffff85d0c563 RDI: 0000000000000540
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffea
R13: ffff88809a257d18 R14: ffff88807a301040 R15: ffff88807a301060
FS:  00007fc3eaad1700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f62f8692028 CR3: 00000000944c1000 CR4: 00000000003426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 llc_ui_sendmsg+0x638/0xec0 net/llc/af_llc.c:952
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7fc3ec15c0e9
RSP: 002b:00007fc3eaad1168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fc3ec26ef60 RCX: 00007fc3ec15c0e9
RDX: 0000000004008090 RSI: 0000000020000540 RDI: 0000000000000004
RBP: 00007fc3ec1b608d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffe116d79f R14: 00007fc3eaad1300 R15: 0000000000022000
Code: 55 ff ff 48 0f ba 73 60 08 45 31 e4 31 ed e8 dd 7c 84 fb 48 8d bd 40 05 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 f2 00 00 00 48 8b 85 40 05 00 00 65 ff 08 44 
RIP: dev_put include/linux/netdevice.h:3381 [inline] RSP: ffff88809a257a78
RIP: llc_ui_autobind.isra.0+0x26b/0x390 net/llc/af_llc.c:320 RSP: ffff88809a257a78
---[ end trace d6dbaa8c76e94a3a ]---
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	ff 48 0f             	decl   0xf(%rax)
   3:	ba 73 60 08 45       	mov    $0x45086073,%edx
   8:	31 e4                	xor    %esp,%esp
   a:	31 ed                	xor    %ebp,%ebp
   c:	e8 dd 7c 84 fb       	callq  0xfb847cee
  11:	48 8d bd 40 05 00 00 	lea    0x540(%rbp),%rdi
  18:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1f:	fc ff df
  22:	48 89 fa             	mov    %rdi,%rdx
  25:	48 c1 ea 03          	shr    $0x3,%rdx
* 29:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2d:	0f 85 f2 00 00 00    	jne    0x125
  33:	48 8b 85 40 05 00 00 	mov    0x540(%rbp),%rax
  3a:	65 ff 08             	decl   %gs:(%rax)
  3d:	44                   	rex.R