BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1d8517067 P4D 1d8517067 PUD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 2930 Comm: syz-executor Not tainted 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09cf0 EFLAGS: 00010206
RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881e59bcec0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881c4abb1c0
RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffffbd38
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881c4abb1c0
FS:  0000555556e09500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001d5224000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 call_timer_fn+0x3c/0x380 kernel/time/timer.c:1448
 expire_timers kernel/time/timer.c:1493 [inline]
 __run_timers+0x81d/0xb60 kernel/time/timer.c:1817
 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1830
 __do_softirq+0x236/0x660 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x197/0x1c0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:539 [inline]
 smp_apic_timer_interrupt+0x11d/0x490 arch/x86/kernel/apic/apic.c:1161
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
 </IRQ>
RIP: 0010:__read_once_size include/linux/compiler.h:268 [inline]
RIP: 0010:__fcheck_files include/linux/fdtable.h:84 [inline]
RIP: 0010:__fget_light fs/file.c:813 [inline]
RIP: 0010:__fdget+0x90/0x200 fs/file.c:826
Code: 45 8b 3e bf 01 00 00 00 44 89 fe e8 5a e1 c4 ff 41 83 ff 01 0f 85 df 00 00 00 49 83 c6 20 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 <74> 08 4c 89 f7 e8 16 d8 f2 ff 4d 8b 36 4c 89 f0 48 c1 e8 03 42 0f
RSP: 0018:ffff8881c467fe50 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffff1103e59cf54 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffff8881e59bcec0 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff8881c467fe78 R08: dffffc0000000000 R09: ffffed103e59cf51
R10: ffffed103e59cf51 R11: 1ffff1103e59cf50 R12: dffffc0000000000
R13: 0000000000000029 R14: ffff8881f2ce7aa0 R15: 0000000000000001
 fdget include/linux/file.h:62 [inline]
 sockfd_lookup_light net/socket.c:482 [inline]
 __sys_getsockopt+0x2b/0x290 net/socket.c:2124
 __do_sys_getsockopt net/socket.c:2153 [inline]
 __se_sys_getsockopt net/socket.c:2150 [inline]
 __x64_sys_getsockopt+0xbf/0xd0 net/socket.c:2150
 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f43e63126aa
Code: ff c3 66 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb b8 0f 1f 44 00 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7
RSP: 002b:00007ffd384fcca8 EFLAGS: 00000212 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007ffd384fcd30 RCX: 00007f43e63126aa
RDX: 0000000000000041 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007ffd384fcccc R09: 0079746972756365
R10: 00007ffd384fcd30 R11: 0000000000000212 R12: 00007f43e6501a00
R13: 00007ffd384fcccc R14: 0000000000000000 R15: 00007f43e6502e40
Modules linked in:
CR2: 0000000000000000
---[ end trace 1a40871d670f6bb2 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09cf0 EFLAGS: 00010206
RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881e59bcec0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881c4abb1c0
RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffffbd38
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881c4abb1c0
FS:  0000555556e09500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001d5224000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
   0:	45 8b 3e             	mov    (%r14),%r15d
   3:	bf 01 00 00 00       	mov    $0x1,%edi
   8:	44 89 fe             	mov    %r15d,%esi
   b:	e8 5a e1 c4 ff       	call   0xffc4e16a
  10:	41 83 ff 01          	cmp    $0x1,%r15d
  14:	0f 85 df 00 00 00    	jne    0xf9
  1a:	49 83 c6 20          	add    $0x20,%r14
  1e:	4c 89 f0             	mov    %r14,%rax
  21:	48 c1 e8 03          	shr    $0x3,%rax
  25:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
* 2a:	74 08                	je     0x34 <-- trapping instruction
  2c:	4c 89 f7             	mov    %r14,%rdi
  2f:	e8 16 d8 f2 ff       	call   0xfff2d84a
  34:	4d 8b 36             	mov    (%r14),%r14
  37:	4c 89 f0             	mov    %r14,%rax
  3a:	48 c1 e8 03          	shr    $0x3,%rax
  3e:	42                   	rex.X
  3f:	0f                   	.byte 0xf