BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 0 P4D 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 6377 Comm: kworker/u4:12 Not tainted 6.2.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Workqueue: writeback wb_workfn (flush-7:2)
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc9000581f498 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffffff8a884280 RCX: 0000000000000000
RDX: 1ffffffff1510850 RSI: ffffc9000581f908 RDI: ffffea000159fac0
RBP: ffff88803d16a388 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000581f908
R13: ffffea000159fac0 R14: ffffea000159fac0 R15: ffff88801e566000
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000000c48e000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __writepage+0x64/0x180 mm/page-writeback.c:2537
 write_cache_pages+0x785/0x19c0 mm/page-writeback.c:2472
 generic_writepages mm/page-writeback.c:2563 [inline]
 generic_writepages mm/page-writeback.c:2552 [inline]
 do_writepages+0x2b8/0x690 mm/page-writeback.c:2583
 __writeback_single_inode+0x159/0x1440 fs/fs-writeback.c:1598
 writeback_sb_inodes+0x54d/0xf90 fs/fs-writeback.c:1889
 __writeback_inodes_wb+0xc6/0x280 fs/fs-writeback.c:1960
 wb_writeback+0x8d6/0xd70 fs/fs-writeback.c:2065
 wb_check_start_all fs/fs-writeback.c:2187 [inline]
 wb_do_writeback fs/fs-writeback.c:2213 [inline]
 wb_workfn+0xb3e/0x12f0 fs/fs-writeback.c:2246
 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
 worker_thread+0x669/0x1090 kernel/workqueue.c:2436
 kthread+0x2e8/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc9000581f498 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffffff8a884280 RCX: 0000000000000000
RDX: 1ffffffff1510850 RSI: ffffc9000581f908 RDI: ffffea000159fac0
RBP: ffff88803d16a388 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000581f908
R13: ffffea000159fac0 R14: ffffea000159fac0 R15: ffff88801e566000
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000000c48e000 CR4: 0000000000350ef0