------------[ cut here ]------------
truncate spotted in mem i_size < btree i_size: 7 < 1048576
WARNING: CPU: 0 PID: 5339 at fs/bcachefs/fs-io.c:457 bchfs_truncate+0xbb5/0xc80 fs/bcachefs/fs-io.c:454
Modules linked in:
CPU: 0 UID: 0 PID: 5339 Comm: syz.0.0 Not tainted 6.14.0-syzkaller-00624-g2f2d52945852 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:bchfs_truncate+0xbb5/0xc80 fs/bcachefs/fs-io.c:454
Code: 8b 4c 24 68 80 3c 01 00 74 08 4c 89 e7 e8 03 2f c2 fd 48 8b 94 24 20 01 00 00 48 c7 c7 00 80 73 8c 48 89 de e8 6c 96 1a fd 90 <0f> 0b 90 90 49 be 00 00 00 00 00 fc ff df e9 d5 f9 ff ff e8 83 db
RSP: 0018:ffffc9000d4274e0 EFLAGS: 00010246
RAX: 91c2d9acc5b34c00 RBX: 0000000000000007 RCX: ffff88801f954880
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000d427758 R08: ffffffff8181ae92 R09: fffffbfff1d3a69c
R10: dffffc0000000000 R11: fffffbfff1d3a69c R12: ffffc9000d427600
R13: 1ffff11008b42188 R14: dffffc0000000000 R15: 0000000000100000
FS:  00007fe2bab176c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000043fa2000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 notify_change+0xbca/0xe90 fs/attr.c:552
 do_truncate+0x220/0x310 fs/open.c:65
 handle_truncate fs/namei.c:3466 [inline]
 do_open fs/namei.c:3849 [inline]
 path_openat+0x2e39/0x35b0 fs/namei.c:4004
 do_filp_open+0x282/0x4e0 fs/namei.c:4031
 do_sys_openat2+0x122/0x1c0 fs/open.c:1429
 do_sys_open fs/open.c:1444 [inline]
 __do_sys_open fs/open.c:1452 [inline]
 __se_sys_open fs/open.c:1448 [inline]
 __x64_sys_open+0x225/0x280 fs/open.c:1448
 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: 0033:0x7fe2b9d8d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe2bab17038 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fe2b9fa6160 RCX: 00007fe2b9d8d169
RDX: 0000000000000006 RSI: 000000000014927e RDI: 00002000000000c0
RBP: 00007fe2b9e0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe2b9fa6160 R15: 00007fffd7d2ed48
 </TASK>