syzbot

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truncate spotted in mem i_size < btree i_size: 44 < 57344
WARNING: CPU: 0 PID: 6920 at fs/bcachefs/fs-io.c:440 bchfs_truncate+0xb79/0xc80 fs/bcachefs/fs-io.c:437
Modules linked in:
CPU: 0 PID: 6920 Comm: syz-executor.1 Not tainted 6.10.0-rc2-syzkaller-00022-g32f88d65f01b #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 3f a8 d2 fd 48 8b 94 24 f8 00 00 00 48 c7 c7 00 9d 12 8c 4c 89 f6 e8 38 60 32 fd 90 <0f> 0b 90 90 e9 8c f9 ff ff e8 89 31 70 fd 48 8b 5c 24 60 48 89 df
RSP: 0018:ffffc9000360f520 EFLAGS: 00010246
RAX: 2bf203f450fe4300 RBX: 1ffff920006c1ec3 RCX: ffff888022b31e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000360f758 R08: ffffffff815846c2 R09: fffffbfff1c3998c
R10: dffffc0000000000 R11: fffffbfff1c3998c R12: ffffc9000360f618
R13: ffff888062ccef68 R14: 000000000000002c R15: ffff888062ccf460
FS:  00007fbf94fff6c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3b73ce2000 CR3: 0000000023a64000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 notify_change+0xb9d/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_openat fs/open.c:1436 [inline]
 __se_sys_openat fs/open.c:1431 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1431
 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: 0033:0x7fbf9547cee9
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:00007fbf94fff0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fbf955b4050 RCX: 00007fbf9547cee9
RDX: 000000000000275a RSI: 0000000020000280 RDI: ffffffffffffff9c
RBP: 00007fbf954da6fe R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fbf955b4050 R15: 00007fffa08784d8
 </TASK>