BUG: kernel NULL pointer dereference, address: 0000000000000649
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 8000000062ef4067 P4D 8000000062ef4067 PUD 0 
Oops: Oops: 0002 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 14791 Comm: syz.2.2892 Not tainted 6.16.0-syzkaller-12063-g37816488247d #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:llc_ui_setsockopt+0x4e1/0x5f0 net/llc/af_llc.c:-1
Code: a2 f8 eb 4b e8 70 aa 3e 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 df 15 a2 f8 <4c> 89 33 eb 23 e8 45 aa 3e f8 4d 8d b7 0d 07 00 00 4c 89 f0 48 c1
RSP: 0018:ffffc90000a08b98 EFLAGS: 00010246
RAX: 00000000000000c9 RBX: 0000000000000649 RCX: ffff888078f85a00
RDX: 0000000000000100 RSI: ffffffff8be32660 RDI: ffff88802f778c10
RBP: ffffc90000a08c90 R08: ffffffff8fa34737 R09: 1ffffffff1f468e6
R10: dffffc0000000000 R11: ffffffff89810060 R12: 1ffff92000141178
R13: ffff88802f778c10 R14: 0000000000000001 R15: 0000000000000001
FS:  00007f5394ec26c0(0000) GS:ffff888125d21000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000649 CR3: 000000007deca000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 expire_timers kernel/time/timer.c:1798 [inline]
 __run_timers kernel/time/timer.c:2372 [inline]
 __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
 run_timer_base kernel/time/timer.c:2393 [inline]
 run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
 handle_softirqs+0x283/0x870 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_release+0x2b5/0x3e0 kernel/locking/lockdep.c:5893
Code: 51 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 56 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 7b 81 02 11 <48> 3b 44 24 28 0f 85 8b 00 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000f0178a8 EFLAGS: 00000206
RAX: 8447548b68787400 RBX: 0000000000000202 RCX: 8447548b68787400
RDX: 0000000000000001 RSI: ffffffff8dba3961 RDI: ffffffff8be32680
RBP: ffff888078f86518 R08: 0000000000000000 R09: ffffffff81b2d573
R10: 0000000000000000 R11: 00000000ffffffff R12: 0000000000000001
R13: 0000000000000001 R14: ffffffff8e139ee0 R15: ffff888078f85a00
 rcu_lock_release include/linux/rcupdate.h:341 [inline]
 rcu_read_unlock include/linux/rcupdate.h:871 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
 futex_ref_get kernel/futex/core.c:1691 [inline]
 futex_private_hash_get+0x23e/0x290 kernel/futex/core.c:147
 futex_hash+0x121/0x2d0 kernel/futex/core.c:312
 class_hb_constructor kernel/futex/futex.h:240 [inline]
 futex_wait_setup+0xc9/0x590 kernel/futex/waitwake.c:623
 __futex_wait+0x148/0x3e0 kernel/futex/waitwake.c:682
 futex_wait+0x104/0x360 kernel/futex/waitwake.c:715
 do_futex+0x333/0x420 kernel/futex/syscalls.c:102
 __do_sys_futex kernel/futex/syscalls.c:179 [inline]
 __se_sys_futex+0x36f/0x400 kernel/futex/syscalls.c:160
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5393f8ebe9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5394ec20e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f53941b5fa8 RCX: 00007f5393f8ebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f53941b5fa8
RBP: 00007f53941b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f53941b6038 R14: 00007ffe2e4ebcf0 R15: 00007ffe2e4ebdd8
 </TASK>
Modules linked in:
CR2: 0000000000000649
---[ end trace 0000000000000000 ]---
RIP: 0010:llc_ui_setsockopt+0x4e1/0x5f0 net/llc/af_llc.c:-1
Code: a2 f8 eb 4b e8 70 aa 3e 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 df 15 a2 f8 <4c> 89 33 eb 23 e8 45 aa 3e f8 4d 8d b7 0d 07 00 00 4c 89 f0 48 c1
RSP: 0018:ffffc90000a08b98 EFLAGS: 00010246
RAX: 00000000000000c9 RBX: 0000000000000649 RCX: ffff888078f85a00
RDX: 0000000000000100 RSI: ffffffff8be32660 RDI: ffff88802f778c10
RBP: ffffc90000a08c90 R08: ffffffff8fa34737 R09: 1ffffffff1f468e6
R10: dffffc0000000000 R11: ffffffff89810060 R12: 1ffff92000141178
R13: ffff88802f778c10 R14: 0000000000000001 R15: 0000000000000001
FS:  00007f5394ec26c0(0000) GS:ffff888125d21000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000649 CR3: 000000007deca000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	a2 f8 eb 4b e8 70 aa 	movabs %al,0xf83eaa70e84bebf8
   7:	3e f8
   9:	4c 6b f3 64          	imul   $0x64,%rbx,%r14
   d:	49 8d 9f a0 06 00 00 	lea    0x6a0(%r15),%rbx
  14:	48 89 d8             	mov    %rbx,%rax
  17:	48 c1 e8 03          	shr    $0x3,%rax
  1b:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
  20:	74 08                	je     0x2a
  22:	48 89 df             	mov    %rbx,%rdi
  25:	e8 df 15 a2 f8       	call   0xf8a21609
* 2a:	4c 89 33             	mov    %r14,(%rbx) <-- trapping instruction
  2d:	eb 23                	jmp    0x52
  2f:	e8 45 aa 3e f8       	call   0xf83eaa79
  34:	4d 8d b7 0d 07 00 00 	lea    0x70d(%r15),%r14
  3b:	4c 89 f0             	mov    %r14,%rax
  3e:	48                   	rex.W
  3f:	c1                   	.byte 0xc1