------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2826!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 4355 Comm: kworker/u8:26 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: writeback wb_workfn (flush-7:8)
RIP: 0010:ext4_do_writepages+0x4662/0x4670 fs/ext4/inode.c:2825
Code: c6 20 ac 63 8b e8 0e e5 aa fe 90 0f 0b e8 76 a1 47 ff 4c 89 f7 48 c7 c6 00 b1 63 8b e8 f7 e4 aa fe 90 0f 0b e8 5f a1 47 ff 90 <0f> 0b 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9001086ed00 EFLAGS: 00010293
RAX: ffffffff827ccfe1 RBX: 0000004210000000 RCX: ffff888035d58000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9001086f110 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100c772d55 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000004000000000 R15: 1ffff11007a638f3
FS:  0000000000000000(0000) GS:ffff888126279000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f88e984674d CR3: 0000000034c34000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3042
 do_writepages+0x32e/0x550 mm/page-writeback.c:2571
 __writeback_single_inode+0x133/0x10e0 fs/fs-writeback.c:1764
 writeback_sb_inodes+0x97f/0x1980 fs/fs-writeback.c:2056
 wb_writeback+0x445/0xb00 fs/fs-writeback.c:2241
 wb_do_writeback fs/fs-writeback.c:2388 [inline]
 wb_workfn+0x3fd/0xf20 fs/fs-writeback.c:2428
 process_one_work kernel/workqueue.c:3302 [inline]
 process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3385
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3466
 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+0x4662/0x4670 fs/ext4/inode.c:2825
Code: c6 20 ac 63 8b e8 0e e5 aa fe 90 0f 0b e8 76 a1 47 ff 4c 89 f7 48 c7 c6 00 b1 63 8b e8 f7 e4 aa fe 90 0f 0b e8 5f a1 47 ff 90 <0f> 0b 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9001086ed00 EFLAGS: 00010293
RAX: ffffffff827ccfe1 RBX: 0000004210000000 RCX: ffff888035d58000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9001086f110 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100c772d55 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000004000000000 R15: 1ffff11007a638f3
FS:  0000000000000000(0000) GS:ffff888126279000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f88e984674d CR3: 0000000034c34000 CR4: 00000000003526f0