BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 78f50067 P4D 78f50067 PUD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3638 Comm: syz-executor.5 Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc900028af780 EFLAGS: 00010246
RAX: 1ffffffff14ff773 RBX: ffffffff8a7fbb98 RCX: ffff88801b081d00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea0001b90740
RBP: dffffc0000000000 R08: ffffffff81b1cf96 R09: fffff940003720e9
R10: fffff940003720e9 R11: 0000000000000000 R12: ffff88802d744110
R13: 0000000000000000 R14: 1ffffd40003720e9 R15: ffffea0001b90740
FS:  0000555556a39400(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000007e9cb000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 folio_mark_dirty+0x136/0x270 mm/page-writeback.c:2643
 f2fs_update_meta_page+0x4a/0x1a0 fs/f2fs/segment.c:2485
 do_checkpoint fs/f2fs/checkpoint.c:1513 [inline]
 f2fs_write_checkpoint+0x31c9/0x5fc0 fs/f2fs/checkpoint.c:1674
 f2fs_issue_checkpoint+0x361/0x4e0
 sync_filesystem+0x19c/0x1f0 fs/sync.c:63
 generic_shutdown_super+0x6b/0x300 fs/super.c:448
 kill_block_super+0x79/0xd0 fs/super.c:1397
 kill_f2fs_super+0x2f9/0x3c0 fs/f2fs/super.c:4478
 deactivate_locked_super+0xa7/0xf0 fs/super.c:335
 cleanup_mnt+0x462/0x510 fs/namespace.c:1143
 task_work_run+0x146/0x1c0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x209/0x220 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300
 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fad43532327
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc00b80ea8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fad43532327
RDX: 00007ffc00b80f7b RSI: 000000000000000a RDI: 00007ffc00b80f70
RBP: 00007ffc00b80f70 R08: 00000000ffffffff R09: 00007ffc00b80d40
R10: 0000555556a3a8b3 R11: 0000000000000246 R12: 00007fad4358a1ea
R13: 00007ffc00b82030 R14: 0000555556a3a810 R15: 00007ffc00b82070
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 19ae47f9f44115f5 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc900028af780 EFLAGS: 00010246
RAX: 1ffffffff14ff773 RBX: ffffffff8a7fbb98 RCX: ffff88801b081d00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea0001b90740
RBP: dffffc0000000000 R08: ffffffff81b1cf96 R09: fffff940003720e9
R10: fffff940003720e9 R11: 0000000000000000 R12: ffff88802d744110
R13: 0000000000000000 R14: 1ffffd40003720e9 R15: ffffea0001b90740
FS:  0000555556a39400(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000007e9cb000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400