audit: type=1804 audit(1642040195.797:851): pid=6709 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir009829693/syzkaller.Rqrn1x/246/bus" dev="sda1" ino=15249 res=1
x_tables: ip6_tables: TCPMSS target: only valid for protocol 6
x_tables: ip6_tables: TCPMSS target: only valid for protocol 6
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
CPU: 0 PID: 18211 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:get_counters+0x2b5/0x630 net/ipv6/netfilter/ip6_tables.c:779
Code: 31 ff 41 89 ec 41 83 e4 01 44 89 e6 e8 f4 a6 49 fa 45 84 e4 0f 85 fc 01 00 00 e8 b6 a5 49 fa 48 8d 7b 08 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 6f 02 00 00 48 8b 43 08 48 89 44 24 18 48 89
RSP: 0018:ffff888048a1fb30 EFLAGS: 00010202
RAX: 00edf11017400001 RBX: 076f8880ba000000 RCX: ffffffff8718dfac
RDX: 0000000000000000 RSI: ffffffff8718dfba RDI: 076f8880ba000008
RBP: 000000000008a8e8 R08: ffffffff8cd4eca0 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880ba02a380 R14: ffff88800010f347 R15: dffffc0000000000
FS:  000055555747d400(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7bb9c201b8 CR3: 000000002fdf0000 CR4: 00000000003426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_ip6t_get_ctl+0x510/0x910 net/ipv6/netfilter/ip6_tables.c:824
 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline]
 nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:122
 ipv6_getsockopt+0x1b6/0x260 net/ipv6/ipv6_sockglue.c:1388
 tcp_getsockopt+0x86/0xd0 net/ipv4/tcp.c:3629
 __sys_getsockopt+0x135/0x210 net/socket.c:2050
 __do_sys_getsockopt net/socket.c:2061 [inline]
 __se_sys_getsockopt net/socket.c:2058 [inline]
 __x64_sys_getsockopt+0xba/0x150 net/socket.c:2058
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f7bb9b414da
Code: 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcc3e06a58 EFLAGS: 00000212 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 0000000000000029 RCX: 00007f7bb9b414da
RDX: 0000000000000041 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 00007ffcc3e06a80 R08: 00007ffcc3e06a7c R09: fefefefeff646b66
R10: 00007ffcc3e06ae0 R11: 0000000000000212 R12: 00007ffcc3e06ae0
R13: 0000000000000003 R14: 00007ffcc3e06a7c R15: 00007f7bb9c228e0
Modules linked in:
---[ end trace 7f3d510dc548a4f2 ]---
RIP: 0010:get_counters+0x2b5/0x630 net/ipv6/netfilter/ip6_tables.c:779
Code: 31 ff 41 89 ec 41 83 e4 01 44 89 e6 e8 f4 a6 49 fa 45 84 e4 0f 85 fc 01 00 00 e8 b6 a5 49 fa 48 8d 7b 08 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 6f 02 00 00 48 8b 43 08 48 89 44 24 18 48 89
RSP: 0018:ffff888048a1fb30 EFLAGS: 00010202
RAX: 00edf11017400001 RBX: 076f8880ba000000 RCX: ffffffff8718dfac
RDX: 0000000000000000 RSI: ffffffff8718dfba RDI: 076f8880ba000008
RBP: 000000000008a8e8 R08: ffffffff8cd4eca0 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880ba02a380 R14: ffff88800010f347 R15: dffffc0000000000
FS:  000055555747d400(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7bb9c201b8 CR3: 000000002fdf0000 CR4: 00000000003426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	31 ff                	xor    %edi,%edi
   2:	41 89 ec             	mov    %ebp,%r12d
   5:	41 83 e4 01          	and    $0x1,%r12d
   9:	44 89 e6             	mov    %r12d,%esi
   c:	e8 f4 a6 49 fa       	callq  0xfa49a705
  11:	45 84 e4             	test   %r12b,%r12b
  14:	0f 85 fc 01 00 00    	jne    0x216
  1a:	e8 b6 a5 49 fa       	callq  0xfa49a5d5
  1f:	48 8d 7b 08          	lea    0x8(%rbx),%rdi
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	0f 85 6f 02 00 00    	jne    0x2a4
  35:	48 8b 43 08          	mov    0x8(%rbx),%rax
  39:	48 89 44 24 18       	mov    %rax,0x18(%rsp)
  3e:	48                   	rex.W
  3f:	89                   	.byte 0x89