EXT4-fs (loop6): Total free blocks count 0
EXT4-fs (loop6): Free/Dirty block details
EXT4-fs (loop6): free_blocks=2415919104
EXT4-fs (loop6): dirty_blocks=32
EXT4-fs (loop6): Block reservation details
EXT4-fs (loop6): i_reserved_data_blocks=1
------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2803!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: writeback wb_workfn (flush-7:6)
RIP: 0010:ext4_do_writepages+0x46d9/0x46e0 fs/ext4/inode.c:2802
Code: c6 60 6f 63 8b e8 87 d3 ab fe 90 0f 0b e8 5f 91 48 ff 4c 89 f7 48 c7 c6 40 74 63 8b e8 70 d3 ab fe 90 0f 0b e8 48 91 48 ff 90 <0f> 0b 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000116d00 EFLAGS: 00010293
RAX: ffffffff827beef8 RBX: 0000004210000000 RCX: ffff88801c6b8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000117110 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100821047f R12: dffffc0000000000
R13: 0000000000000001 R14: 0000004000000000 R15: 1ffff1100816b0f3
FS:  0000000000000000(0000) GS:ffff888126338000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbff4ab6000 CR3: 0000000035632000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3019
 do_writepages+0x32e/0x550 mm/page-writeback.c:2554
 __writeback_single_inode+0x133/0x11a0 fs/fs-writeback.c:1750
 writeback_sb_inodes+0x995/0x19d0 fs/fs-writeback.c:2042
 wb_writeback+0x456/0xb70 fs/fs-writeback.c:2227
 wb_do_writeback fs/fs-writeback.c:2374 [inline]
 wb_workfn+0x41a/0xf60 fs/fs-writeback.c:2414
 process_one_work kernel/workqueue.c:3276 [inline]
 process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 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+0x46d9/0x46e0 fs/ext4/inode.c:2802
Code: c6 60 6f 63 8b e8 87 d3 ab fe 90 0f 0b e8 5f 91 48 ff 4c 89 f7 48 c7 c6 40 74 63 8b e8 70 d3 ab fe 90 0f 0b e8 48 91 48 ff 90 <0f> 0b 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000116d00 EFLAGS: 00010293
RAX: ffffffff827beef8 RBX: 0000004210000000 RCX: ffff88801c6b8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000117110 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100821047f R12: dffffc0000000000
R13: 0000000000000001 R14: 0000004000000000 R15: 1ffff1100816b0f3
FS:  0000000000000000(0000) GS:ffff888126338000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbff4ab6000 CR3: 0000000035632000 CR4: 00000000003526f0