BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1e7a40067 P4D 1e7a40067 PUD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 814 Comm: syz.3.115 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:ffff8881f6e09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881e6fe3f00
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881eb9d31c0
RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffff97c0
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881eb9d31c0
FS:  00007f1de96056c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e1cbd000 CR4: 00000000003406b0
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:ffff8881e6a1f1d8 EFLAGS: 00000a06 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: 0000000000000a06 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000a06 RDI: ffffffff862911c0
RBP: ffff8881e6a1f1f0 R08: dffffc0000000000 R09: fffff94000e53009
R10: fffff94000e53009 R11: 1ffffd4000e53008 R12: ffffea0007298048
R13: dffffc0000000000 R14: ffffffff862911c0 R15: 0000000000000070
 spin_unlock_irqrestore include/linux/spinlock.h:393 [inline]
 release_pages+0xa37/0xaa0 mm/swap.c:839
 __pagevec_release+0xbb/0x140 mm/swap.c:862
 pagevec_release include/linux/pagevec.h:88 [inline]
 shmem_undo_range+0x7d8/0x1860 mm/shmem.c:875
 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
 dentry_unlink_inode+0x2ca/0x370 fs/dcache.c:378
 __dentry_kill+0x43e/0x640 fs/dcache.c:583
 dentry_kill+0xc0/0x2a0 fs/dcache.c:677
 dput+0x42/0x80 fs/dcache.c:864
 __fput+0x4ba/0x730 fs/file_table.c:294
 ____fput+0x15/0x20 fs/file_table.c:314
 task_work_run+0x146/0x170 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0xa43/0x2660 kernel/exit.c:861
 do_group_exit+0x13e/0x300 kernel/exit.c:984
 get_signal+0xdee/0x13d0 kernel/signal.c:2738
 do_signal+0xad/0xda0 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0xc4/0x1b0 arch/x86/entry/common.c:159
 prepare_exit_to_usermode+0x18e/0x1f0 arch/x86/entry/common.c:194
 ret_from_intr+0x1c/0x1c
RIP: 0033:0x7f1deaf9c971
Code: 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 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:00002000000004d0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f1deb1c3fa0 RCX: 00007f1deaf9c969
RDX: 0000200000000040 RSI: 00002000000004d0 RDI: 0000000080008000
RBP: 00007f1deb01eab1 R08: 0000200000000500 R09: 0000200000000500
R10: 0000200000000180 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1deb1c3fa0 R15: 00007fffca67d1c8
Modules linked in:
CR2: 0000000000000000
---[ end trace 739ace471a5f8c41 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881e6fe3f00
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881eb9d31c0
RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffff97c0
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881eb9d31c0
FS:  00007f1de96056c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e1cbd000 CR4: 00000000003406b0
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