BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 7542b067 P4D 7542b067 PUD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3543 Comm: syz-executor.1 Not tainted 5.15.110-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc90002def858 EFLAGS: 00010286
RAX: 1ffffffff152d78b RBX: ffffea0002768b80 RCX: ffffffff8a96bc58
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea0002768b80
RBP: ffffc90002defb50 R08: ffffffff81aa61c9 R09: fffff940004ed171
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc90002defae0
R13: ffffea0000ad6d00 R14: ffff88806be8e000 R15: ffffea0000ad6d00
FS:  0000555556992400(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000032308000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 get_next_nat_page fs/f2fs/node.c:158 [inline]
 __flush_nat_entry_set fs/f2fs/node.c:3009 [inline]
 f2fs_flush_nat_entries+0xd91/0x24e0 fs/f2fs/node.c:3113
 f2fs_write_checkpoint+0x119d/0x1b50 fs/f2fs/checkpoint.c:1680
 kill_f2fs_super+0x235/0x3c0 fs/f2fs/super.c:4504
 deactivate_locked_super+0xa0/0x110 fs/super.c:335
 cleanup_mnt+0x44e/0x500 fs/namespace.c:1143
 task_work_run+0x129/0x1a0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:175
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301
 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f258fe875d7
Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff65f64b28 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f258fe875d7
RDX: 00007fff65f64bfa RSI: 000000000000000a RDI: 00007fff65f64bf0
RBP: 00007fff65f64bf0 R08: 00000000ffffffff R09: 00007fff65f649c0
R10: 0000555556993873 R11: 0000000000000246 R12: 00007f258fee0cdc
R13: 00007fff65f65cb0 R14: 0000555556993810 R15: 00007fff65f65cf0
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace fb492c097f10b008 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc90002def858 EFLAGS: 00010286
RAX: 1ffffffff152d78b RBX: ffffea0002768b80 RCX: ffffffff8a96bc58
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea0002768b80
RBP: ffffc90002defb50 R08: ffffffff81aa61c9 R09: fffff940004ed171
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc90002defae0
R13: ffffea0000ad6d00 R14: ffff88806be8e000 R15: ffffea0000ad6d00
FS:  0000555556992400(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000032308000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400