BUG: kernel NULL pointer dereference, address: 0000000000000649
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 80000000272ac067 P4D 80000000272ac067 PUD 0 
Oops: Oops: 0002 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 31000 Comm: syz.1.10960 Not tainted 6.16.0-syzkaller-06620-gae633388cae3-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:llc_ui_setsockopt+0x4e1/0x5f0
Code: aa f8 eb 4b e8 30 7b 47 f8 4c 6b f3 64 49 8d 9f a0 06 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 ef 9e aa f8 <4c> 89 33 eb 23 e8 05 7b 47 f8 4d 8d b7 0d 07 00 00 4c 89 f0 48 c1
RSP: 0018:ffffc900001e0b98 EFLAGS: 00010246
RAX: 00000000000000c9 RBX: 0000000000000649 RCX: ffff888039fd1cc0
RDX: 0000000000000100 RSI: ffffffff8be309e0 RDI: ffff888121046c10
RBP: ffffc900001e0c90 R08: ffffffff8fa07bf7 R09: 1ffffffff1f40f7e
R10: dffffc0000000000 R11: ffffffff897834a0 R12: 1ffff9200003c178
R13: ffff888121046c10 R14: 0000000000000001 R15: 0000000000000001
FS:  00007f7ef21316c0(0000) GS:ffff8881a3c80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000649 CR3: 000000010fbf6000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:unmap_page_range+0x408/0x41c0
Code: 00 48 8b bc 24 d8 00 00 00 49 89 fe 49 c1 ee 03 4d 89 e5 43 80 3c 26 00 74 0d e8 53 c5 19 00 48 8b bc 24 d8 00 00 00 48 8b 1f <e9> 14 3b 00 00 e8 4e a2 b6 ff 31 ff 48 89 de e8 24 a7 b6 ff 48 85
RSP: 0018:ffffc9000642f3a0 EFLAGS: 00000246
RAX: ffffffff82090e1b RBX: 800000004568e067 RCX: ffff888039fd1cc0
RDX: 0000000000000000 RSI: 00007f7ef11fffff RDI: ffff88803c42c7f0
RBP: ffffc9000642f650 R08: ffffc9000642f730 R09: 0000000000000002
R10: 0000000000000406 R11: 0000000000000000 R12: dffffc0000000000
R13: dffffc0000000000 R14: 1ffff110078858fe R15: 00007f7ef11ff000
 unmap_vmas+0x399/0x580
 exit_mmap+0x248/0xb50
 __mmput+0x118/0x420
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x22e0
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7ef138ebe9
Code: Unable to access opcode bytes at 0x7f7ef138ebbf.
RSP: 002b:00007f7ef21310e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f7ef15b5fa8 RCX: 00007f7ef138ebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f7ef15b5fa8
RBP: 00007f7ef15b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7ef15b6038 R14: 00007ffe5653edf0 R15: 00007ffe5653eed8
 </TASK>
Modules linked in:
CR2: 0000000000000649
---[ end trace 0000000000000000 ]---
RIP: 0010:llc_ui_setsockopt+0x4e1/0x5f0
Code: aa f8 eb 4b e8 30 7b 47 f8 4c 6b f3 64 49 8d 9f a0 06 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 ef 9e aa f8 <4c> 89 33 eb 23 e8 05 7b 47 f8 4d 8d b7 0d 07 00 00 4c 89 f0 48 c1
RSP: 0018:ffffc900001e0b98 EFLAGS: 00010246
RAX: 00000000000000c9 RBX: 0000000000000649 RCX: ffff888039fd1cc0
RDX: 0000000000000100 RSI: ffffffff8be309e0 RDI: ffff888121046c10
RBP: ffffc900001e0c90 R08: ffffffff8fa07bf7 R09: 1ffffffff1f40f7e
R10: dffffc0000000000 R11: ffffffff897834a0 R12: 1ffff9200003c178
R13: ffff888121046c10 R14: 0000000000000001 R15: 0000000000000001
FS:  00007f7ef21316c0(0000) GS:ffff8881a3c80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000649 CR3: 000000010fbf6000 CR4: 00000000000006f0
