TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
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: 17715 Comm: syz-executor.1 Not tainted 4.14.262-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888098a061c0 task.stack: ffff8880557d8000
RIP: 0010:scatterwalk_start include/crypto/scatterwalk.h:86 [inline]
RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:111 [inline]
RIP: 0010:scatterwalk_copychunks+0x4a3/0x680 crypto/scatterwalk.c:55
RSP: 0018:ffff8880557df520 EFLAGS: 00010202
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
RAX: dffffc0000000000 RBX: 0000000000000022 RCX: ffffc90007bec000
RDX: 0000000000000002 RSI: ffffffff8316e3c4 RDI: ffff8880ab037118
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed10122a0004
R10: ffff888091500021 R11: 0000000000000010 R12: 0000000000000022
R13: ffff8880557df5d8 R14: 0000000000000005 R15: ffff8880ab037124
FS:  00007fe720c06700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe720c05ff8 CR3: 00000000aaf58000 CR4: 00000000003426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 scatterwalk_map_and_copy crypto/scatterwalk.c:72 [inline]
 scatterwalk_map_and_copy+0x100/0x1a0 crypto/scatterwalk.c:60
 gcmaes_encrypt.constprop.0+0x6cd/0xc00 arch/x86/crypto/aesni-intel_glue.c:802
Code: fc ff df 80 3c 02 00 0f 85 d9 01 00 00 48 8d 45 10 49 89 6d 00 48 89 c2 48 89 44 24 18 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 81 01 00 00 48 b8 00 00 00 
RIP: scatterwalk_start include/crypto/scatterwalk.h:86 [inline] RSP: ffff8880557df520
RIP: scatterwalk_pagedone include/crypto/scatterwalk.h:111 [inline] RSP: ffff8880557df520
RIP: scatterwalk_copychunks+0x4a3/0x680 crypto/scatterwalk.c:55 RSP: ffff8880557df520
---[ end trace 581c4e53f8aea646 ]---
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	df 80 3c 02 00 0f    	filds  0xf00023c(%rax)
   6:	85 d9                	test   %ebx,%ecx
   8:	01 00                	add    %eax,(%rax)
   a:	00 48 8d             	add    %cl,-0x73(%rax)
   d:	45 10 49 89          	adc    %r9b,-0x77(%r9)
  11:	6d                   	insl   (%dx),%es:(%rdi)
  12:	00 48 89             	add    %cl,-0x77(%rax)
  15:	c2 48 89             	retq   $0x8948
  18:	44 24 18             	rex.R and $0x18,%al
  1b:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  22:	fc ff df
  25:	48 c1 ea 03          	shr    $0x3,%rdx
* 29:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2d:	84 c0                	test   %al,%al
  2f:	74 08                	je     0x39
  31:	3c 03                	cmp    $0x3,%al
  33:	0f 8e 81 01 00 00    	jle    0x1ba
  39:	48                   	rex.W
  3a:	b8                   	.byte 0xb8
  3b:	00 00                	add    %al,(%rax)