BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 161306067 P4D 161306067 PUD 1612e5067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 1997 Comm: syz-executor.3 Not tainted 5.14.0-rc6-next-20210820-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc9001b967e20 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffffff8d282060 RCX: ffffc900104a6000
RDX: 1ffffffff1a50422 RSI: ffffffff87d5bbfd RDI: ffff88808b5ae4c0
RBP: ffff88808b5ae4c0 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff87d5bb78 R11: 0000000000000001 R12: 0000000000000001
R13: ffff88808b5aead8 R14: ffff88808b5ae318 R15: ffff88808b5ae540
FS:  00007eff3cb90700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000161303000 CR4: 00000000001506e0
Call Trace:
 unix_shutdown+0x292/0x5c0 net/unix/af_unix.c:2857
 __sys_shutdown_sock net/socket.c:2242 [inline]
 __sys_shutdown_sock net/socket.c:2236 [inline]
 __sys_shutdown+0xf1/0x1b0 net/socket.c:2254
 __do_sys_shutdown net/socket.c:2262 [inline]
 __se_sys_shutdown net/socket.c:2260 [inline]
 __x64_sys_shutdown+0x50/0x70 net/socket.c:2260
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007eff3cb90188 EFLAGS: 00000246 ORIG_RAX: 0000000000000030
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffe4ee86a4f R14: 00007eff3cb90300 R15: 0000000000022000
Modules linked in:
CR2: 0000000000000000
---[ end trace 22ad401faf8814d6 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc9001b967e20 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffffff8d282060 RCX: ffffc900104a6000
RDX: 1ffffffff1a50422 RSI: ffffffff87d5bbfd RDI: ffff88808b5ae4c0
RBP: ffff88808b5ae4c0 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff87d5bb78 R11: 0000000000000001 R12: 0000000000000001
R13: ffff88808b5aead8 R14: ffff88808b5ae318 R15: ffff88808b5ae540
FS:  00007eff3cb90700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000161303000 CR4: 00000000001506e0