------------[ cut here ]------------
truncate spotted in mem i_size < btree i_size: 1 < 65536
WARNING: CPU: 0 PID: 21470 at fs/bcachefs/fs-io.c:437 bchfs_truncate+0xb79/0xc80 fs/bcachefs/fs-io.c:434
Modules linked in:
CPU: 0 PID: 21470 Comm: syz-executor.3 Not tainted 6.9.0-syzkaller-07726-g3c999d1ae3c7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:bchfs_truncate+0xb79/0xc80 fs/bcachefs/fs-io.c:434
Code: 00 fc ff df 80 3c 03 00 74 08 4c 89 e7 e8 0f 99 d3 fd 48 8b 94 24 f8 00 00 00 48 c7 c7 c0 79 12 8c 4c 89 f6 e8 58 a8 30 fd 90 <0f> 0b 90 90 e9 8c f9 ff ff e8 c9 84 6e fd 48 8b 5c 24 60 48 89 df
RSP: 0018:ffffc9000444f540 EFLAGS: 00010246
RAX: 905eeaf034cf6100 RBX: 1ffff92000889ec7 RCX: 0000000000040000
RDX: ffffc9001ee16000 RSI: 000000000000d21a RDI: 000000000000d21b
RBP: ffffc9000444f778 R08: ffffffff81585642 R09: fffffbfff1c3995c
R10: dffffc0000000000 R11: fffffbfff1c3995c R12: ffffc9000444f638
R13: ffff88807b666098 R14: 0000000000000001 R15: ffff88807b666590
FS:  00007f4fc61a46c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6edc4fd000 CR3: 000000004d708000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 notify_change+0xb9f/0xe70 fs/attr.c:497
 do_truncate+0x220/0x310 fs/open.c:65
 handle_truncate fs/namei.c:3308 [inline]
 do_open fs/namei.c:3654 [inline]
 path_openat+0x29fe/0x3240 fs/namei.c:3807
 do_filp_open+0x235/0x490 fs/namei.c:3834
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1406
 do_sys_open fs/open.c:1421 [inline]
 __do_sys_creat fs/open.c:1497 [inline]
 __se_sys_creat fs/open.c:1491 [inline]
 __x64_sys_creat+0x123/0x170 fs/open.c:1491
 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: 0033:0x7f4fc547cee9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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:00007f4fc61a40c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f4fc55ac050 RCX: 00007f4fc547cee9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200000c0
RBP: 00007f4fc54c949e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f4fc55ac050 R15: 00007ffe6bd4b598
 </TASK>