------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2809!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 1182 Comm: kworker/u8:9 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: writeback wb_workfn (flush-7:6)
RIP: 0010:ext4_do_writepages+0x45f0/0x4600 fs/ext4/inode.c:2808
Code: c6 80 04 1e 8b e8 b0 a0 be fe 90 0f 0b e8 a8 53 55 ff 4c 89 f7 48 c7 c6 60 08 1e 8b e8 99 a0 be fe 90 0f 0b e8 91 53 55 ff 90 <0f> 0b 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90
RSP: 0000:ffffc90004ac6cc0 EFLAGS: 00010293
RAX: ffffffff82690c0f RBX: 0000004210000000 RCX: ffff8880269b8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90004ac70f0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1007b16be3 R12: 0000000000000001
R13: ffffc90004ac7140 R14: 0000004000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881269bf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1632f9f5c9 CR3: 000000004c58a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ext4_writepages+0x205/0x350 fs/ext4/inode.c:3025
 do_writepages+0x32b/0x550 mm/page-writeback.c:2634
 __writeback_single_inode+0x145/0x1000 fs/fs-writeback.c:1680
 writeback_sb_inodes+0x6b7/0xf60 fs/fs-writeback.c:1976
 wb_writeback+0x43b/0xaf0 fs/fs-writeback.c:2156
 wb_do_writeback fs/fs-writeback.c:2303 [inline]
 wb_workfn+0x40e/0xf00 fs/fs-writeback.c:2343
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
 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+0x45f0/0x4600 fs/ext4/inode.c:2808
Code: c6 80 04 1e 8b e8 b0 a0 be fe 90 0f 0b e8 a8 53 55 ff 4c 89 f7 48 c7 c6 60 08 1e 8b e8 99 a0 be fe 90 0f 0b e8 91 53 55 ff 90 <0f> 0b 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90
RSP: 0000:ffffc90004ac6cc0 EFLAGS: 00010293
RAX: ffffffff82690c0f RBX: 0000004210000000 RCX: ffff8880269b8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90004ac70f0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1007b16be3 R12: 0000000000000001
R13: ffffc90004ac7140 R14: 0000004000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881269bf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1632f9f5c9 CR3: 000000000d7a6000 CR4: 00000000003526f0