syzbot

loop0: detected capacity change from 0 to 64
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5148 at fs/buffer.c:1176 mark_buffer_dirty+0x2e5/0x520 fs/buffer.c:1176
Modules linked in:
CPU: 0 PID: 5148 Comm: syz-executor714 Not tainted 6.9.0-rc7-syzkaller-00012-gdccb07f2914c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:mark_buffer_dirty+0x2e5/0x520 fs/buffer.c:1176
Code: 89 df e8 9e 57 dd ff 48 8b 3b be 04 00 00 00 5b 41 5e 41 5f 5d e9 7b 0b fc ff e8 a6 fb 7b ff e9 73 ff ff ff e8 9c fb 7b ff 90 <0f> 0b 90 e9 61 fd ff ff e8 8e fb 7b ff 90 0f 0b 90 e9 88 fd ff ff
RSP: 0018:ffffc9000375f7e0 EFLAGS: 00010293
RAX: ffffffff821a0bf4 RBX: dffffc0000000001 RCX: ffff888018330000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff821a0951 R09: 1ffff1100fff8a3a
R10: dffffc0000000000 R11: ffffed100fff8a3b R12: ffff88807ffc4bc8
R13: ffff88807ffc51d0 R14: ffff88807ffc51d0 R15: ffff888076ef1200
FS:  00007f0a36b3b6c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020004000 CR3: 000000002b402000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bfs_move_block fs/bfs/file.c:44 [inline]
 bfs_move_blocks fs/bfs/file.c:57 [inline]
 bfs_get_block+0x8f8/0xb90 fs/bfs/file.c:126
 __block_write_begin_int+0x50c/0x1a70 fs/buffer.c:2105
 __block_write_begin fs/buffer.c:2154 [inline]
 block_write_begin+0x9b/0x1e0 fs/buffer.c:2213
 bfs_write_begin+0x35/0xd0 fs/bfs/file.c:179
 generic_perform_write+0x322/0x640 mm/filemap.c:3974
 generic_file_write_iter+0xaf/0x310 mm/filemap.c:4095
 call_write_iter include/linux/fs.h:2110 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa84/0xcb0 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0a36b84c19
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0a36b3b218 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f0a36c0c6c8 RCX: 00007f0a36b84c19
RDX: 000000000208e24b RSI: 0000000020000440 RDI: 0000000000000004
RBP: 00007f0a36c0c6c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0a36bd90c0
R13: 00007f0a36bd906b R14: 0030656c69662f2e R15: 0031656c69662f2e
 </TASK>