linux-kernel - Re: [syzbot] [hfs?] kernel BUG in hfs_new

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Message-ID: <68fa49fb.050a0220.346f24.007e.GAE@google.com>
Date: Thu, 23 Oct 2025 08:30:03 -0700
From: syzbot <syzbot+17cc9bb6d8d69b4139f0@...kaller.appspotmail.com>
To: ekffu200098@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [hfs?] kernel BUG in hfs_new_inode

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in hfs_new_inode

loop0: detected capacity change from 0 to 64
hfs: unable to locate alternate MDB
hfs: continuing without an alternate MDB
------------[ cut here ]------------
kernel BUG at fs/hfs/inode.c:222!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 6697 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:hfs_new_inode+0xbc4/0xbd0 fs/hfs/inode.c:222
Code: 89 f1 80 e1 07 fe c1 38 c1 0f 8c 15 fa ff ff 4c 89 f7 e8 0f 6d 8b ff e9 08 fa ff ff e8 c5 b5 29 ff 90 0f 0b e8 bd b5 29 ff 90 <0f> 0b e8 b5 b5 29 ff 90 0f 0b 66 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90003b37848 EFLAGS: 00010293
RAX: ffffffff829557c3 RBX: ffff88803a419748 RCX: ffff888026245a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1004f94608 R12: ffff888027ca3000
R13: 1ffff110068414f3 R14: 0000000100000000 R15: ffff88803a419748
FS:  00007f166458e6c0(0000) GS:ffff888126bc2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31463fff CR3: 000000003ad7a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 hfs_create+0x2a/0xe0 fs/hfs/dir.c:198
 lookup_open fs/namei.c:3796 [inline]
 open_last_lookups fs/namei.c:3895 [inline]
 path_openat+0x1500/0x3840 fs/namei.c:4131
 do_filp_open+0x1fa/0x410 fs/namei.c:4161
 do_sys_openat2+0x121/0x1c0 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_openat fs/open.c:1468 [inline]
 __se_sys_openat fs/open.c:1463 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1463
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1664f1efc9
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:00007f166458e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f1665175fa0 RCX: 00007f1664f1efc9
RDX: 0000000000000042 RSI: 00002000000002c0 RDI: ffffffffffffff9c
RBP: 00007f1664fa1f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000058 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1665176038 R14: 00007f1665175fa0 R15: 00007ffeb72a90b8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hfs_new_inode+0xbc4/0xbd0 fs/hfs/inode.c:222
Code: 89 f1 80 e1 07 fe c1 38 c1 0f 8c 15 fa ff ff 4c 89 f7 e8 0f 6d 8b ff e9 08 fa ff ff e8 c5 b5 29 ff 90 0f 0b e8 bd b5 29 ff 90 <0f> 0b e8 b5 b5 29 ff 90 0f 0b 66 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90003b37848 EFLAGS: 00010293
RAX: ffffffff829557c3 RBX: ffff88803a419748 RCX: ffff888026245a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1004f94608 R12: ffff888027ca3000
R13: 1ffff110068414f3 R14: 0000000100000000 R15: ffff88803a419748
FS:  00007f166458e6c0(0000) GS:ffff888126bc2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31463fff CR3: 000000003ad7a000 CR4: 00000000003526f0


Tested on:

commit:         43e9ad0c Merge tag 'scsi-fixes' of git://git.kernel.or..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=128eb734580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=216353986aa62c5d
dashboard link: https://syzkaller.appspot.com/bug?extid=17cc9bb6d8d69b4139f0
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14dd5b04580000