------------[ cut here ]------------
truncate spotted in mem i_size < btree i_size: 1 < 65536
WARNING: CPU: 0 PID: 5407 at fs/bcachefs/fs-io.c:440 bchfs_truncate+0xb79/0xc80 fs/bcachefs/fs-io.c:437
Modules linked in:
CPU: 0 PID: 5407 Comm: syz-executor.4 Not tainted 6.10.0-rc2-syzkaller-00097-g2df0193e62cf #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:437
Code: 00 fc ff df 80 3c 03 00 74 08 4c 89 e7 e8 5f a4 d2 fd 48 8b 94 24 f8 00 00 00 48 c7 c7 c0 b0 12 8c 4c 89 f6 e8 d8 12 2f fd 90 <0f> 0b 90 90 e9 8c f9 ff ff e8 39 e4 6c fd 48 8b 5c 24 60 48 89 df
RSP: 0018:ffffc90002dbf540 EFLAGS: 00010246
RAX: 2e3349fde6437300 RBX: 1ffff920005b7ec7 RCX: 0000000000040000
RDX: ffffc9000d5b3000 RSI: 000000000000be0a RDI: 000000000000be0b
RBP: ffffc90002dbf778 R08: ffffffff815857a2 R09: fffffbfff1c39994
R10: dffffc0000000000 R11: fffffbfff1c39994 R12: ffffc90002dbf638
R13: ffff8880568c1688 R14: 0000000000000001 R15: ffff8880568c1b80
FS:  00007fe0a4e986c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32b41000 CR3: 000000007b3d0000 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+0x2a3d/0x3280 fs/namei.c:3807
 do_filp_open+0x235/0x490 fs/namei.c:3834
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1405
 do_sys_open fs/open.c:1420 [inline]
 __do_sys_creat fs/open.c:1496 [inline]
 __se_sys_creat fs/open.c:1490 [inline]
 __x64_sys_creat+0x123/0x170 fs/open.c:1490
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe0a407cf69
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:00007fe0a4e980c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007fe0a41b4120 RCX: 00007fe0a407cf69
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000200
RBP: 00007fe0a40da6fe R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fe0a41b4120 R15: 00007fffbce10088
 </TASK>