netlink: 32 bytes leftover after parsing attributes in process `syz.0.0'.
Zero length message leads to an empty skb
bcachefs (loop0): inode 4100 i_blocks underflow: 0 + -8 < 0 (ondisk 0)
bcachefs (loop0): inconsistency detected - emergency read only at journal seq 12
------------[ cut here ]------------
kernel BUG at fs/bcachefs/quota.c:232!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted 6.12.0-rc7-syzkaller-00012-g3022e9d00ebe #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:bch2_quota_check_limit+0xd48/0xd70 fs/bcachefs/quota.c:232
Code: de e8 8c 08 b1 00 e9 9b fa ff ff e8 62 e6 4f fd 48 c7 c7 90 14 f7 8e 48 89 de e8 73 08 b1 00 e9 d8 fa ff ff e8 49 e6 4f fd 90 <0f> 0b e8 41 e6 4f fd 90 0f 0b e8 39 e6 4f fd 90 0f 0b e8 31 e6 4f
RSP: 0018:ffffc90001797330 EFLAGS: 00010293
RAX: ffffffff8444f3c7 RBX: 0000000000000000 RCX: ffff8880001d0000
RDX: 0000000000000000 RSI: fffffffffffffff8 RDI: 0000000000000000
RBP: fffffffffffffff8 R08: ffffffff8444e70f R09: fffffffffffffff8
R10: dffffc0000000000 R11: fffffbfff203a13e R12: ffff888036d60800
R13: 0000000000000000 R14: fffffffffffffff8 R15: ffffc90001797460
FS:  00007f9180ea36c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f917503f000 CR3: 000000004315c000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_quota_acct+0x3fb/0x750 fs/bcachefs/quota.c:299
 bch2_i_sectors_acct fs/bcachefs/fs-io.h:138 [inline]
 bchfs_truncate+0x8b8/0xc90 fs/bcachefs/fs-io.c:465
 notify_change+0xbca/0xe90 fs/attr.c:503
 do_truncate+0x220/0x310 fs/open.c:65
 handle_truncate fs/namei.c:3395 [inline]
 do_open fs/namei.c:3778 [inline]
 path_openat+0x2e1e/0x3590 fs/namei.c:3933
 do_filp_open+0x235/0x490 fs/namei.c:3960
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1415
 do_sys_open fs/open.c:1430 [inline]
 __do_sys_openat fs/open.c:1446 [inline]
 __se_sys_openat fs/open.c:1441 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1441
 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: 0033:0x7f918017e719
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:00007f9180ea3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f9180336058 RCX: 00007f918017e719
RDX: 000000000000275a RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 00007f91801f1616 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9180336058 R15: 00007ffc801732a8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bch2_quota_check_limit+0xd48/0xd70 fs/bcachefs/quota.c:232
Code: de e8 8c 08 b1 00 e9 9b fa ff ff e8 62 e6 4f fd 48 c7 c7 90 14 f7 8e 48 89 de e8 73 08 b1 00 e9 d8 fa ff ff e8 49 e6 4f fd 90 <0f> 0b e8 41 e6 4f fd 90 0f 0b e8 39 e6 4f fd 90 0f 0b e8 31 e6 4f
RSP: 0018:ffffc90001797330 EFLAGS: 00010293
RAX: ffffffff8444f3c7 RBX: 0000000000000000 RCX: ffff8880001d0000
RDX: 0000000000000000 RSI: fffffffffffffff8 RDI: 0000000000000000
RBP: fffffffffffffff8 R08: ffffffff8444e70f R09: fffffffffffffff8
R10: dffffc0000000000 R11: fffffbfff203a13e R12: ffff888036d60800
R13: 0000000000000000 R14: fffffffffffffff8 R15: ffffc90001797460
FS:  00007f9180ea36c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f917503f000 CR3: 000000004315c000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400