EXT4-fs (loop4): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
EXT4-fs error (device loop4): ext4_mb_generate_buddy:1317: group 0, block bitmap and bg descriptor inconsistent: 25 vs 281 free clusters
------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2827!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 U[  246.344585][ T7703] CPU: 1 UID: 0 PID: 7703 Comm: syz.4.357 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:ext4_do_writepages+0x479e/0x47a0 fs/ext4/inode.c:2826
Code: c6 60 16 84 8b e8 92 e0 a6 fe 90 0f 0b e8 da 54 44 ff 4c 89 f7 48 c7 c6 40 1b 84 8b e8 7b e0 a6 fe 90 0f 0b e8 c3 54 44 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:ffffc900103b6f40 EFLAGS: 00010293
RAX: ffffffff8280e47d RBX: 0000004210000000 RCX: ffff88801e735d00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900103b7350 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100c5668ed R12: ffffc900103b75e0
R13: 1ffff92002076ebc R14: 0000004000000000 R15: 0000000000000001
FS:  00007f28106166c0(0000) GS:ffff888125d4c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000004a48 CR3: 0000000036d12000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3043
 do_writepages+0x338/0x560 mm/page-writeback.c:2571
 filemap_writeback mm/filemap.c:387 [inline]
 filemap_fdatawrite_range mm/filemap.c:412 [inline]
 file_write_and_wait_range+0x374/0x440 mm/filemap.c:786
 mmb_fsync_noflush+0x76/0x1d0 fs/buffer.c:652
 ext4_fsync_nojournal fs/ext4/fsync.c:92 [inline]
 ext4_sync_file+0x423/0xd10 fs/ext4/fsync.c:160
 generic_write_sync include/linux/fs.h:2666 [inline]
 ext4_buffered_write_iter+0x2ca/0x370 fs/ext4/file.c:322
 ext4_file_write_iter+0x94b/0x1c90 fs/ext4/file.c:-1
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x61e/0xbb0 fs/read_write.c:687
 ksys_pwrite64 fs/read_write.c:794 [inline]
 __do_sys_pwrite64 fs/read_write.c:802 [inline]
 __se_sys_pwrite64 fs/read_write.c:799 [inline]
 __x64_sys_pwrite64+0x199/0x230 fs/read_write.c:799
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f28123bde59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2810616028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f2812645fa0 RCX: 00007f28123bde59
RDX: 0000000000000001 RSI: 0000200000000140 RDI: 0000000000000006
RBP: 00007f2812453e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2812646038 R14: 00007f2812645fa0 R15: 00007ffde3f77418
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_do_writepages+0x479e/0x47a0 fs/ext4/inode.c:2826
Code: c6 60 16 84 8b e8 92 e0 a6 fe 90 0f 0b e8 da 54 44 ff 4c 89 f7 48 c7 c6 40 1b 84 8b e8 7b e0 a6 fe 90 0f 0b e8 c3 54 44 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:ffffc900103b6f40 EFLAGS: 00010293
RAX: ffffffff8280e47d RBX: 0000004210000000 RCX: ffff88801e735d00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900103b7350 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100c5668ed R12: ffffc900103b75e0
R13: 1ffff92002076ebc R14: 0000004000000000 R15: 0000000000000001
FS:  00007f28106166c0(0000) GS:ffff888125c4c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a18c68f950 CR3: 0000000036d12000 CR4: 00000000003526f0