------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2809!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 6346 Comm: kworker/u8:18 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: writeback wb_workfn (flush-7:3)
RIP: 0010:ext4_do_writepages+0x2b4a/0x3c80 fs/ext4/inode.c:2809
Code: ad 10 ff ff ff 48 c1 ea 03 80 3c 02 00 0f 84 9f e9 ff ff 48 8b bd 28 ff ff ff e8 51 d1 a5 ff e9 8e e9 ff ff e8 07 ec 3c ff 90 <0f> 0b e8 ff eb 3c ff 90 0f 0b 90 e9 89 e6 ff ff e8 f1 eb 3c ff 90
RSP: 0018:ffffc9000ed2f230 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88806c1489f0 RCX: ffffffff8281cff0
RDX: ffff88802bc93d00 RSI: ffffffff8281ea09 RDI: 0000000000000007
RBP: ffffc9000ed2f400 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000001 R11: ffff88802bc94830 R12: ffffc9000ed2f440
R13: 0000000000000001 R14: ffff88806c148c38 R15: 0000000004208060
FS:  0000000000000000(0000) GS:ffff8881248f6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1214e7cd58 CR3: 000000002f876000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 ext4_writepages+0x37a/0x7d0 fs/ext4/inode.c:3026
 do_writepages+0x27a/0x600 mm/page-writeback.c:2598
 __writeback_single_inode+0x168/0x14a0 fs/fs-writeback.c:1737
 writeback_sb_inodes+0x72e/0x1ce0 fs/fs-writeback.c:2030
 wb_writeback+0x419/0xae0 fs/fs-writeback.c:2216
 wb_do_writeback fs/fs-writeback.c:2363 [inline]
 wb_workfn+0x14d/0xbb0 fs/fs-writeback.c:2403
 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
 process_scheduled_works kernel/workqueue.c:3340 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_do_writepages+0x2b4a/0x3c80 fs/ext4/inode.c:2809
Code: ad 10 ff ff ff 48 c1 ea 03 80 3c 02 00 0f 84 9f e9 ff ff 48 8b bd 28 ff ff ff e8 51 d1 a5 ff e9 8e e9 ff ff e8 07 ec 3c ff 90 <0f> 0b e8 ff eb 3c ff 90 0f 0b 90 e9 89 e6 ff ff e8 f1 eb 3c ff 90
RSP: 0018:ffffc9000ed2f230 EFLAGS: 00010293

RAX: 0000000000000000 RBX: ffff88806c1489f0 RCX: ffffffff8281cff0
RDX: ffff88802bc93d00 RSI: ffffffff8281ea09 RDI: 0000000000000007
RBP: ffffc9000ed2f400 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000001 R11: ffff88802bc94830 R12: ffffc9000ed2f440
R13: 0000000000000001 R14: ffff88806c148c38 R15: 0000000004208060
FS:  0000000000000000(0000) GS:ffff8881248f6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb225af1e9c CR3: 000000002853f000 CR4: 0000000000350ef0