syzbot

loop0: detected capacity change from 0 to 2048
------------[ cut here ]------------
WARNING: CPU: 0 PID: 3541 at fs/nilfs2/dat.c:158 nilfs_dat_prepare_end+0x248/0x2a0
Modules linked in:
CPU: 0 PID: 3541 Comm: syz-executor271 Not tainted 6.1.69-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:nilfs_dat_prepare_end+0x248/0x2a0 fs/nilfs2/dat.c:158
Code: c5 3d fe 89 eb 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 67 c5 3d fe e8 e2 c4 b3 fd e9 5a ff ff ff e8 58 c5 3d fe <0f> 0b bb fe ff ff ff eb d2 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c
RSP: 0018:ffffc9000394f738 EFLAGS: 00010293
RAX: ffffffff834cc8b8 RBX: 00000000fffffffe RCX: ffff88801f4b9dc0
RDX: 0000000000000000 RSI: 00000000fffffffe RDI: 00000000fffffffe
RBP: 1ffff1100f8ceb53 R08: ffffffff834cc831 R09: ffffffff834b0627
R10: 0000000000000002 R11: ffff88801f4b9dc0 R12: ffff88807c675a98
R13: ffff888073ba0158 R14: ffff88807c675ab0 R15: dffffc0000000000
FS:  0000555557266380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1815d9eae0 CR3: 000000001ebd6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 nilfs_bmap_prepare_end_ptr fs/nilfs2/bmap.h:211 [inline]
 nilfs_btree_prepare_delete fs/nilfs2/btree.c:1451 [inline]
 nilfs_btree_delete+0x4be/0x11b0 fs/nilfs2/btree.c:1599
 nilfs_bmap_do_delete fs/nilfs2/bmap.c:184 [inline]
 nilfs_bmap_do_truncate fs/nilfs2/bmap.c:272 [inline]
 nilfs_bmap_truncate+0x2fc/0x560 fs/nilfs2/bmap.c:305
 nilfs_truncate_bmap+0x203/0x3c0 fs/nilfs2/inode.c:846
 nilfs_truncate+0x28b/0x500 fs/nilfs2/inode.c:876
 nilfs_setattr+0x216/0x2c0 fs/nilfs2/inode.c:990
 notify_change+0xce3/0xfc0 fs/attr.c:499
 do_truncate+0x21c/0x300 fs/open.c:65
 do_sys_ftruncate+0x2e2/0x380 fs/open.c:193
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fc675fd65f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcadc1e5e8 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007ffcadc1e7b8 RCX: 00007fc675fd65f9
RDX: 00007fc6760119b3 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fc67604a610 R08: 0000000000000000 R09: 00007ffcadc1e7b8
R10: 0000000000000a62 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffcadc1e7a8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>