------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2813!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 622 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: writeback wb_workfn (flush-7:8)
RIP: 0010:ext4_do_writepages+0x46d6/0x46e0 fs/ext4/inode.c:2812
Code: c6 80 0b e4 8b e8 da 91 a1 fe 90 0f 0b e8 f2 25 3f ff 4c 89 f7 48 c7 c6 60 10 e4 8b e8 c3 91 a1 fe 90 0f 0b e8 db 25 3f ff 90 <0f> 0b 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90002f96d00 EFLAGS: 00010293
RAX: ffffffff82868915 RBX: 0000004210000000 RCX: ffff88802586db80
RDX: 0000000000000000 RSI: 0000004000000000 RDI: 0000000000000000
RBP: ffffc90002f97110 R08: ffff888054b609ef R09: 1ffff1100a96c13d
R10: dffffc0000000000 R11: ffffed100a96c13e R12: dffffc0000000000
R13: 0000000000000001 R14: 0000004000000000 R15: 1ffff1100aa45cc7
FS:  0000000000000000(0000) GS:ffff888125557000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000024a030 CR3: 0000000083cc7000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3029
 do_writepages+0x32e/0x550 mm/page-writeback.c:2554
 __writeback_single_inode+0x133/0x11a0 fs/fs-writeback.c:1762
 writeback_sb_inodes+0x992/0x1a20 fs/fs-writeback.c:2054
 wb_writeback+0x456/0xb70 fs/fs-writeback.c:2239
 wb_do_writeback fs/fs-writeback.c:2386 [inline]
 wb_workfn+0x414/0xf50 fs/fs-writeback.c:2426
 process_one_work kernel/workqueue.c:3276 [inline]
 process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_do_writepages+0x46d6/0x46e0 fs/ext4/inode.c:2812
Code: c6 80 0b e4 8b e8 da 91 a1 fe 90 0f 0b e8 f2 25 3f ff 4c 89 f7 48 c7 c6 60 10 e4 8b e8 c3 91 a1 fe 90 0f 0b e8 db 25 3f ff 90 <0f> 0b 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90002f96d00 EFLAGS: 00010293
RAX: ffffffff82868915 RBX: 0000004210000000 RCX: ffff88802586db80
RDX: 0000000000000000 RSI: 0000004000000000 RDI: 0000000000000000
RBP: ffffc90002f97110 R08: ffff888054b609ef R09: 1ffff1100a96c13d
R10: dffffc0000000000 R11: ffffed100a96c13e R12: dffffc0000000000
R13: 0000000000000001 R14: 0000004000000000 R15: 1ffff1100aa45cc7
FS:  0000000000000000(0000) GS:ffff888125557000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f44f47d8000 CR3: 000000005919e000 CR4: 0000000000350ef0