EXT4-fs error (device loop0): ext4_read_block_bitmap_nowait:483: comm syz.0.168: Invalid block bitmap block 0 in block_group 0
EXT4-fs error (device loop0): ext4_read_block_bitmap_nowait:483: comm syz.0.168: Invalid block bitmap block 0 in block_group 0
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ext4: mb_load_buddy failed (-117)
WARNING: CPU: 0 PID: 9218 at fs/ext4/mballoc.c:4640 ext4_discard_allocated_blocks+0x591/0x710 fs/ext4/mballoc.c:4639
Modules linked in:
CPU: 0 UID: 0 PID: 9218 Comm: syz.0.168 Not tainted 6.15.0-rc3-syzkaller-g9d7a0577c9db #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:ext4_discard_allocated_blocks+0x591/0x710 fs/ext4/mballoc.c:4639
Code: 24 80 00 00 00 e8 9f 21 ff ff 4c 8d 3d 18 67 3b 10 e9 c9 fc ff ff e8 be 7a 3c ff 48 c7 c7 20 58 de 8b 44 89 fe e8 7f 1b fc fe <0f> 0b 4c 8d 3d f6 66 3b 10 e9 a7 fc ff ff e8 9c 7a 3c ff e9 d9 fe
RSP: 0018:ffffc9000c5e6c00 EFLAGS: 00010246
RAX: 92c043e8e9496100 RBX: 0000000000000001 RCX: ffff88802c0f8000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000c5e6d30 R08: ffffffff8181173e R09: 1ffff110170c47d2
R10: dffffc0000000000 R11: ffffed10170c47d3 R12: dffffc0000000000
R13: 1ffff920018bcd8c R14: ffff8880704f4288 R15: 00000000ffffff8b
FS:  00007fd6459696c0(0000) GS:ffff888125a1a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 000000001fb1e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_mb_new_blocks+0x14da/0x4dd0 fs/ext4/mballoc.c:6235
 ext4_ext_map_blocks+0x1c05/0x7d30 fs/ext4/extents.c:4379
 ext4_map_create_blocks fs/ext4/inode.c:520 [inline]
 ext4_map_blocks+0x917/0x1920 fs/ext4/inode.c:706
 _ext4_get_block+0x237/0x6b0 fs/ext4/inode.c:785
 ext4_get_block_unwritten+0x2b/0x100 fs/ext4/inode.c:818
 ext4_block_write_begin+0x4d4/0x1510 fs/ext4/inode.c:1067
 ext4_write_begin+0x782/0x1320 fs/ext4/ext4_jbd2.h:-1
 ext4_da_write_begin+0x4a4/0xb00 fs/ext4/inode.c:2932
 generic_perform_write+0x325/0xa00 mm/filemap.c:4103
 ext4_buffered_write_iter+0xc7/0x390 fs/ext4/file.c:299
 ext4_file_write_iter+0x97b/0x1da0 fs/ext4/file.c:-1
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x6f2/0xd10 fs/read_write.c:684
 ksys_write+0x199/0x2d0 fs/read_write.c:736
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x7e/0x150 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fd644b8e169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd645969038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd644db5fa0 RCX: 00007fd644b8e169
RDX: 000000000000a000 RSI: 0000200000000780 RDI: 0000000000000005
RBP: 00007fd644c10a68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd644db5fa0 R15: 00007ffc222c7da8
 </TASK>