------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in net/llc/llc_conn.c:681:24
index -1 is out of range for type 'int [12][5]'
CPU: 1 UID: 0 PID: 5904 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 ubsan_epilogue+0xa/0x30 lib/ubsan.c:233
 __ubsan_handle_out_of_bounds+0xcc/0xf0 lib/ubsan.c:455
 llc_find_offset net/llc/llc_conn.c:681 [inline]
 llc_qualify_conn_ev net/llc/llc_conn.c:395 [inline]
 llc_conn_service net/llc/llc_conn.c:360 [inline]
 llc_conn_state_process+0x1392/0x1480 net/llc/llc_conn.c:66
 llc_conn_rcv net/llc/llc_conn.c:750 [inline]
 llc_conn_handler+0x599/0x1490 net/llc/llc_conn.c:817
 llc_rcv+0x55a/0xcb0 net/llc/llc_input.c:206
 __netif_receive_skb_list_ptype net/core/dev.c:6312 [inline]
 __netif_receive_skb_list_ptype net/core/dev.c:6296 [inline]
 __netif_receive_skb_list_core+0x6da/0x940 net/core/dev.c:6354
 __netif_receive_skb_list net/core/dev.c:6406 [inline]
 netif_receive_skb_list_internal+0x722/0xd40 net/core/dev.c:6497
 netif_receive_skb_list net/core/dev.c:6549 [inline]
 netif_receive_skb_list+0x72/0x500 net/core/dev.c:6539
 xdp_recv_frames net/bpf/test_run.c:268 [inline]
 xdp_test_run_batch.constprop.0+0x16bb/0x1ca0 net/bpf/test_run.c:349
 bpf_test_run_xdp_live+0x367/0x760 net/bpf/test_run.c:378
 bpf_prog_test_run_xdp+0xd86/0x1670 net/bpf/test_run.c:1463
 bpf_prog_test_run kernel/bpf/syscall.c:4804 [inline]
 __sys_bpf+0x2265/0x4a30 kernel/bpf/syscall.c:6385
 __do_sys_bpf kernel/bpf/syscall.c:6486 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6483 [inline]
 __x64_sys_bpf+0xce/0x140 kernel/bpf/syscall.c:6483
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f33ed39e159
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:00007f33ee22c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f33ed625fa0 RCX: 00007f33ed39e159
RDX: 0000000000000048 RSI: 0000200000000600 RDI: 000000000000000a
RBP: 00007f33ed43506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f33ed626038 R14: 00007f33ed625fa0 R15: 00007ffd762869a8
 </TASK>
---[ end trace ]---