BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1ec743067 P4D 1ec743067 PUD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 339 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: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881f30d8000
RDX: 0000000080000101 RSI: 0000000000000000 RDI: ffff8881c9a7b1c0
RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffff9c08
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881c9a7b1c0
FS:  0000555569e04500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001d7ab2000 CR4: 00000000003406a0
DR0: 0000200000000300 DR1: 0000000000000000 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x51/0x80 kernel/locking/spinlock.c:191
Code: 89 fe 48 c7 c7 b0 2d cb 85 e8 ab 7f 62 fd 4c 89 f7 48 83 3d 40 34 a0 01 00 74 34 e8 0d 38 1d fd 66 90 48 89 5d e8 ff 75 e8 9d <bf> 01 00 00 00 e8 e5 7a 16 fd 65 8b 05 fa 93 d7 7b 85 c0 74 09 48
RSP: 0018:ffff8881d7b2f840 EFLAGS: 00000a02 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: 0000000000000a02 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000a02 RDI: ffff8881cb2196b8
RBP: ffff8881d7b2f858 R08: dffffc0000000000 R09: ffffed103b9758a0
R10: ffffed103b9758a0 R11: 1ffff1103b97589f R12: 0000000000000a02
R13: ffffea000716f2c8 R14: ffff8881cb2196b0 R15: ffff8881cb2196b8
 spin_unlock_irqrestore include/linux/spinlock.h:393 [inline]
 delete_from_page_cache+0xc9/0x100 mm/filemap.c:274
 truncate_inode_page+0x5d/0x70 mm/truncate.c:225
 shmem_undo_range+0x6ad/0x1860 mm/shmem.c:869
 shmem_truncate_range mm/shmem.c:997 [inline]
 shmem_evict_inode+0x204/0x9a0 mm/shmem.c:1097
 evict+0x465/0x880 fs/inode.c:610
 iput_final fs/inode.c:1652 [inline]
 iput+0x67d/0x810 fs/inode.c:1678
 do_unlinkat+0x33f/0x670 fs/namei.c:4218
 __do_sys_unlink fs/namei.c:4259 [inline]
 __se_sys_unlink fs/namei.c:4257 [inline]
 __x64_sys_unlink+0x49/0x50 fs/namei.c:4257
 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f446f53af17
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 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:00007ffc36d5b728 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f446f53af17
RDX: 00007ffc36d5b750 RSI: 00007ffc36d5b7e0 RDI: 00007ffc36d5b7e0
RBP: 00007ffc36d5b7e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffc36d5c870
R13: 00007f446f5bd89d R14: 000000000000aeac R15: 00007ffc36d5c8b0
Modules linked in:
CR2: 0000000000000000
---[ end trace cd31108a245259f4 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881f30d8000
RDX: 0000000080000101 RSI: 0000000000000000 RDI: ffff8881c9a7b1c0
RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffff9c08
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881c9a7b1c0
FS:  0000555569e04500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001d7ab2000 CR4: 00000000003406a0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
   0:	89 fe                	mov    %edi,%esi
   2:	48 c7 c7 b0 2d cb 85 	mov    $0xffffffff85cb2db0,%rdi
   9:	e8 ab 7f 62 fd       	call   0xfd627fb9
   e:	4c 89 f7             	mov    %r14,%rdi
  11:	48 83 3d 40 34 a0 01 	cmpq   $0x0,0x1a03440(%rip)        # 0x1a03459
  18:	00
  19:	74 34                	je     0x4f
  1b:	e8 0d 38 1d fd       	call   0xfd1d382d
  20:	66 90                	xchg   %ax,%ax
  22:	48 89 5d e8          	mov    %rbx,-0x18(%rbp)
  26:	ff 75 e8             	push   -0x18(%rbp)
  29:	9d                   	popf
* 2a:	bf 01 00 00 00       	mov    $0x1,%edi <-- trapping instruction
  2f:	e8 e5 7a 16 fd       	call   0xfd167b19
  34:	65 8b 05 fa 93 d7 7b 	mov    %gs:0x7bd793fa(%rip),%eax        # 0x7bd79435
  3b:	85 c0                	test   %eax,%eax
  3d:	74 09                	je     0x48
  3f:	48                   	rex.W