BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 7f634067 P4D 7f634067 PUD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 3621 Comm: syz-executor.4 Tainted: G S                5.17.0-rc3-syzkaller-00020-g555f3d7be91a #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:ffffc9000288f780 EFLAGS: 00010246
RAX: 1ffffffff1500bbb RBX: ffffffff8a805dd8 RCX: ffff888023720000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea0001a3f080
RBP: dffffc0000000000 R08: ffffffff81b2f5e6 R09: fffff94000347e11
R10: fffff94000347e11 R11: 0000000000000000 R12: ffff888048101950
R13: 0000000000000000 R14: 1ffffd4000347e11 R15: ffffea0001a3f080
FS:  0000555556234400(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000004bb38000 CR4: 00000000003506e0
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:2482
 do_checkpoint fs/f2fs/checkpoint.c:1518 [inline]
 f2fs_write_checkpoint+0x3228/0x5fa0 fs/f2fs/checkpoint.c:1674
 f2fs_issue_checkpoint+0x361/0x4e0
 sync_filesystem+0x1bc/0x220 fs/sync.c:66
 generic_shutdown_super+0x6b/0x300 fs/super.c:445
 kill_block_super+0x79/0xd0 fs/super.c:1394
 kill_f2fs_super+0x2f9/0x3c0 fs/f2fs/super.c:4523
 deactivate_locked_super+0xa7/0xf0 fs/super.c:332
 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:188 [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: 0033:0x7f78b36414c7
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:00007fff1cfd4498 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f78b36414c7
RDX: 00007fff1cfd456c RSI: 000000000000000a RDI: 00007fff1cfd4560
RBP: 00007fff1cfd4560 R08: 00000000ffffffff R09: 00007fff1cfd4330
R10: 00005555562358b3 R11: 0000000000000246 R12: 00007f78b36991ea
R13: 00007fff1cfd5620 R14: 0000555556235810 R15: 00007fff1cfd5660
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc9000288f780 EFLAGS: 00010246
RAX: 1ffffffff1500bbb RBX: ffffffff8a805dd8 RCX: ffff888023720000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea0001a3f080
RBP: dffffc0000000000 R08: ffffffff81b2f5e6 R09: fffff94000347e11
R10: fffff94000347e11 R11: 0000000000000000 R12: ffff888048101950
R13: 0000000000000000 R14: 1ffffd4000347e11 R15: ffffea0001a3f080
FS:  0000555556234400(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000004bb38000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400