dccp_invalid_packet: P.Data Offset(0) too small
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 25904 Comm: syz-executor4 Not tainted 4.13.0+ #42
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d0dfc000 task.stack: ffff8801d3de0000
RIP: 0010:__list_add_valid+0x46/0xd0 lib/list_debug.c:26
RSP: 0018:ffff8801d3de73d0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff8801ca3d1168 RCX: ffffc9000395a000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801ca3d1170
RBP: ffff8801d3de73e8 R08: 0000000000000000 R09: 1ffff1003a7bcddc
R10: 00000000d20c7b3d R11: 000000005fdfade5 R12: ffff8801d4319280
R13: ffff8801d9ac4400 R14: ffff8801ca3d1168 R15: 0000000000000000
FS:  00007f86f4fe8700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020eb1000 CR3: 00000001d8fd6000 CR4: 00000000001406f0
Call Trace:
 __list_add include/linux/list.h:59 [inline]
 list_add_tail include/linux/list.h:92 [inline]
 sock_map_ctx_update_elem.isra.11+0x9e9/0x1a00 kernel/bpf/sockmap.c:768
 sock_map_update_elem+0x145/0x2d0 kernel/bpf/sockmap.c:843
 map_update_elem kernel/bpf/syscall.c:588 [inline]
 SYSC_bpf kernel/bpf/syscall.c:1469 [inline]
 SyS_bpf+0x20cb/0x4c50 kernel/bpf/syscall.c:1444
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x451e59
RSP: 002b:00007f86f4fe7c08 EFLAGS: 00000216 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000718160 RCX: 0000000000451e59
RDX: 0000000000000020 RSI: 00000000202cc000 RDI: 0000000000000002
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000216 R12: 0000000000000000
R13: 0000000000a6f7ef R14: 00007f86f4fe89c0 R15: 0000000000000004
Code: 48 89 fa 48 83 ec 08 48 c1 ea 03 80 3c 02 00 75 7c 48 8b 53 08 48 39 f2 75 37 48 89 f2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 75 6e 48 8b 16 48 39 da 75 29 49 39 f4 74 38 49 39 
RIP: __list_add_valid+0x46/0xd0 lib/list_debug.c:26 RSP: ffff8801d3de73d0
---[ end trace 7de2920aabedc82e ]---
Kernel panic - not syncing: Fatal exception in interrupt
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..