------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2816!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 7977 Comm: kworker/u8:15 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: writeback wb_workfn (flush-7:3)
RIP: 0010:ext4_do_writepages+0x476b/0x4770 fs/ext4/inode.c:2815
Code: c6 a0 73 85 8b e8 75 49 a1 fe 90 0f 0b e8 6d 36 40 ff 4c 89 f7 48 c7 c6 80 78 85 8b e8 5e 49 a1 fe 90 0f 0b e8 56 36 40 ff 90 <0f> 0b 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f
RSP: 0000:ffffc90006436ce0 EFLAGS: 00010293
RAX: ffffffff82867e5a RBX: 0000004210000000 RCX: ffff8880375c9f40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900064370f0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100c479cbc R12: ffff8880235ec318
R13: dffffc0000000000 R14: 0000004000000000 R15: ffff8880623ce838
FS:  0000000000000000(0000) GS:ffff888125cc7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4a0c28eba0 CR3: 000000002b656000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3032
 do_writepages+0x338/0x560 mm/page-writeback.c:2560
 __writeback_single_inode+0x136/0x1230 fs/fs-writeback.c:1788
 writeback_sb_inodes+0x9db/0x1ab0 fs/fs-writeback.c:2099
 wb_writeback+0x41c/0xad0 fs/fs-writeback.c:2284
 wb_do_writeback fs/fs-writeback.c:2452 [inline]
 wb_workfn+0x437/0x10f0 fs/fs-writeback.c:2497
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/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+0x476b/0x4770 fs/ext4/inode.c:2815
Code: c6 a0 73 85 8b e8 75 49 a1 fe 90 0f 0b e8 6d 36 40 ff 4c 89 f7 48 c7 c6 80 78 85 8b e8 5e 49 a1 fe 90 0f 0b e8 56 36 40 ff 90 <0f> 0b 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f
RSP: 0000:ffffc90006436ce0 EFLAGS: 00010293
RAX: ffffffff82867e5a RBX: 0000004210000000 RCX: ffff8880375c9f40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900064370f0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100c479cbc R12: ffff8880235ec318
R13: dffffc0000000000 R14: 0000004000000000 R15: ffff8880623ce838
FS:  0000000000000000(0000) GS:ffff888125cc7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f840f793368 CR3: 000000003b2ac000 CR4: 00000000003526f0