BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 75f54067 P4D 75f54067 PUD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3649 Comm: syz-executor.5 Not tainted 6.0.0-syzkaller-09423-g493ffd6605b2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0000:ffffc9000446f580 EFLAGS: 00010296
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88801ed58000
RDX: 0000000000000000 RSI: ffffea00020eec00 RDI: ffff888036cb90f8
RBP: ffffea00021ea3c0 R08: ffffffff81b5b45b R09: fffff9400041dd81
R10: fffff9400041dd81 R11: 1ffffd400041dd80 R12: ffffea00021ea3c0
R13: dffffc0000000000 R14: ffffea00020eec00 R15: ffffea00021ea3c8
FS:  0000555555f05400(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000002e6bd000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 get_next_nat_page+0x3a9/0x770 fs/f2fs/node.c:154
 __flush_nat_entry_set fs/f2fs/node.c:3005 [inline]
 f2fs_flush_nat_entries+0x9e3/0x1bf0 fs/f2fs/node.c:3109
 f2fs_write_checkpoint+0x14f1/0x1d70 fs/f2fs/checkpoint.c:1667
 f2fs_issue_checkpoint+0x309/0x4a0
 sync_filesystem+0x1bc/0x220 fs/sync.c:66
 generic_shutdown_super+0x6b/0x310 fs/super.c:473
 kill_block_super+0x79/0xd0 fs/super.c:1427
 kill_f2fs_super+0x2f9/0x3c0 fs/f2fs/super.c:4544
 deactivate_locked_super+0xa7/0xf0 fs/super.c:331
 cleanup_mnt+0x4ce/0x560 fs/namespace.c:1186
 task_work_run+0x146/0x1c0 kernel/task_work.c:177
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x124/0x150 kernel/entry/common.c:169
 exit_to_user_mode_prepare+0xb2/0x140 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:294
 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f4ea548ca17
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:00007fff645a7108 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f4ea548ca17
RDX: 00007fff645a71da RSI: 000000000000000a RDI: 00007fff645a71d0
RBP: 00007fff645a71d0 R08: 00000000ffffffff R09: 00007fff645a6fa0
R10: 0000555555f068b3 R11: 0000000000000246 R12: 00007f4ea54e55f6
R13: 00007fff645a8290 R14: 0000555555f06810 R15: 00007fff645a82d0
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0000:ffffc9000446f580 EFLAGS: 00010296
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88801ed58000
RDX: 0000000000000000 RSI: ffffea00020eec00 RDI: ffff888036cb90f8
RBP: ffffea00021ea3c0 R08: ffffffff81b5b45b R09: fffff9400041dd81
R10: fffff9400041dd81 R11: 1ffffd400041dd80 R12: ffffea00021ea3c0
R13: dffffc0000000000 R14: ffffea00020eec00 R15: ffffea00021ea3c8
FS:  0000555555f05400(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000002e6bd000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400