------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2827!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 4179 Comm: kworker/u8:15 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: writeback wb_workfn (flush-7:3)
RIP: 0010:ext4_do_writepages+0x479e/0x47a0 fs/ext4/inode.c:2826
Code: c6 20 2a 84 8b e8 b2 ef a5 fe 90 0f 0b e8 da f8 43 ff 4c 89 f7 48 c7 c6 00 2f 84 8b e8 9b ef a5 fe 90 0f 0b e8 c3 f8 43 ff 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6
RSP: 0018:ffffc9000f94ed00 EFLAGS: 00010293
RAX: ffffffff8281cf6d RBX: 0000004210000000 RCX: ffff888034469f00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000f94f110 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1008ae55f7 R12: ffffc9000f94f4c0
R13: 1ffff92001f29e98 R14: 0000004000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888125c46000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9c04cdc000 CR3: 0000000034f18000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3043
 do_writepages+0x338/0x560 mm/page-writeback.c:2571
 __writeback_single_inode+0x12e/0xf90 fs/fs-writeback.c:1787
 writeback_sb_inodes+0x9db/0x1ab0 fs/fs-writeback.c:2079
 wb_writeback+0x41c/0xad0 fs/fs-writeback.c:2264
 wb_do_writeback fs/fs-writeback.c:2432 [inline]
 wb_workfn+0x437/0x10f0 fs/fs-writeback.c:2477
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 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+0x479e/0x47a0 fs/ext4/inode.c:2826
Code: c6 20 2a 84 8b e8 b2 ef a5 fe 90 0f 0b e8 da f8 43 ff 4c 89 f7 48 c7 c6 00 2f 84 8b e8 9b ef a5 fe 90 0f 0b e8 c3 f8 43 ff 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6
RSP: 0018:ffffc9000f94ed00 EFLAGS: 00010293
RAX: ffffffff8281cf6d RBX: 0000004210000000 RCX: ffff888034469f00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000f94f110 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1008ae55f7 R12: ffffc9000f94f4c0
R13: 1ffff92001f29e98 R14: 0000004000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888125c46000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9c04cd6000 CR3: 00000000371a4000 CR4: 00000000003526f0