BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1cc127067 P4D 1cc127067 PUD 1e9f63067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 1271 Comm: syz-executor.4 Not tainted 5.4.274-syzkaller-00002-g6f97bd951d82 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010202
RAX: ffffffff8154d7aa RBX: 0000000000000101 RCX: ffff8881dd6faf40
RDX: 0000000080000101 RSI: 0000000000000000 RDI: ffff8881e564b1c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154d3ee R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffff9e60
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e564b1c0
FS:  00007fe68e4276c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001dfd13000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 call_timer_fn+0x36/0x390 kernel/time/timer.c:1448
 expire_timers kernel/time/timer.c:1493 [inline]
 __run_timers+0x879/0xbe0 kernel/time/timer.c:1817
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830
 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x195/0x1c0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:538 [inline]
 smp_apic_timer_interrupt+0x11a/0x460 arch/x86/kernel/apic/apic.c:1149
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
 </IRQ>
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x45/0x60 kernel/locking/spinlock.c:199
Code: 08 00 74 0c 48 c7 c7 90 3b eb 85 e8 75 12 43 fd 48 83 3d cd 2c 9a 01 00 74 29 48 89 df e8 e3 e7 fa fc 66 90 fb bf 01 00 00 00 <e8> 66 d4 f3 fc 65 8b 05 ab 7e b1 7b 85 c0 74 02 5b c3 e8 34 45 af
RSP: 0018:ffff8881e2447c20 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: ffff8881eeb92300 RCX: dffffc0000000000
RDX: ffffc9000387c000 RSI: 000000000003ffff RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff813e99c9 R09: ffffed103c488fc4
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881dd6fb6b0
R13: dffffc0000000000 R14: 0000000000000021 R15: 000000001c000004
 spin_unlock_irq include/linux/spinlock.h:388 [inline]
 get_signal+0x137e/0x1440 kernel/signal.c:2738
 do_signal+0xb0/0x11f0 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0xc0/0x1a0 arch/x86/entry/common.c:159
 prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7fe68f0acf27
Code: 14 25 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89
RSP: 002b:00007fe68e427178 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007fe68f1e3f88 RCX: 00007fe68f0acf29
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fe68f1e3f88
RBP: 00007fe68f1e3f80 R08: 00007fe68e4276c0 R09: 00007fe68e4276c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe68f1e3f8c
R13: 000000000000000b R14: 00007fffa379fc70 R15: 00007fffa379fd58
Modules linked in:
CR2: 0000000000000000
---[ end trace c68387bf0364af0c ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010202
RAX: ffffffff8154d7aa RBX: 0000000000000101 RCX: ffff8881dd6faf40
RDX: 0000000080000101 RSI: 0000000000000000 RDI: ffff8881e564b1c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154d3ee R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffff9e60
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e564b1c0
FS:  00007fe68e4276c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001dfd13000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	08 00                	or     %al,(%rax)
   2:	74 0c                	je     0x10
   4:	48 c7 c7 90 3b eb 85 	mov    $0xffffffff85eb3b90,%rdi
   b:	e8 75 12 43 fd       	call   0xfd431285
  10:	48 83 3d cd 2c 9a 01 	cmpq   $0x0,0x19a2ccd(%rip)        # 0x19a2ce5
  17:	00
  18:	74 29                	je     0x43
  1a:	48 89 df             	mov    %rbx,%rdi
  1d:	e8 e3 e7 fa fc       	call   0xfcfae805
  22:	66 90                	xchg   %ax,%ax
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 66 d4 f3 fc       	call   0xfcf3d495 <-- trapping instruction
  2f:	65 8b 05 ab 7e b1 7b 	mov    %gs:0x7bb17eab(%rip),%eax        # 0x7bb17ee1
  36:	85 c0                	test   %eax,%eax
  38:	74 02                	je     0x3c
  3a:	5b                   	pop    %rbx
  3b:	c3                   	ret
  3c:	e8                   	.byte 0xe8
  3d:	34 45                	xor    $0x45,%al
  3f:	af                   	scas   %es:(%rdi),%eax