[v6.1] kernel BUG in hfs_btree_open

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 7c15117f9468 Linux 6.1.115
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=13936d5f980000
kernel config: https://syzkaller.appspot.com/x/.config?x=c9c0221b8515082d
dashboard link: https://syzkaller.appspot.com/bug?extid=298605ea32f195873e14
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d43a49ab45a4/disk-7c15117f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d1169a6dd6d5/vmlinux-7c15117f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/cac0c99432c7/bzImage-7c15117f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+298605...@syzkaller.appspotmail.com

loop2: 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/btree.c:41!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5414 Comm: syz.2.291 Not tainted 6.1.115-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:hfs_btree_open+0xf05/0xf20 fs/hfs/btree.c:41
Code: 7f ff e9 7e fa ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 9b fa ff ff 4c 89 f7 e8 a5 c1 7f ff e9 8e fa ff ff e8 5b 3e 28 ff <0f> 0b e8 54 3e 28 ff 0f 0b e8 4d 3e 28 ff 0f 0b 66 2e 0f 1f 84 00
RSP: 0018:ffffc9001a357798 EFLAGS: 00010287
RAX: ffffffff826254f5 RBX: ffff8880706c7360 RCX: 0000000000040000
RDX: ffffc90004faa000 RSI: 000000000000517c RDI: 000000000000517d
RBP: 0000000000000000 R08: ffffffff82624753 R09: ffffed100e0d8e88
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888028fb8000
R13: ffff88805b428008 R14: ffff88805b428000 R15: dffffc0000000000
FS: 00007f1dcd5136c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555635ec808 CR3: 00000000203ef000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
hfs_mdb_get+0x1442/0x21b0 fs/hfs/mdb.c:199
hfs_fill_super+0x100c/0x1730 fs/hfs/super.c:406
mount_bdev+0x2c9/0x3f0 fs/super.c:1443
legacy_get_tree+0xeb/0x180 fs/fs_context.c:632
vfs_get_tree+0x88/0x270 fs/super.c:1573
do_new_mount+0x2ba/0xb40 fs/namespace.c:3056
do_mount fs/namespace.c:3399 [inline]
__do_sys_mount fs/namespace.c:3607 [inline]
__se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3584
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1dcc77feba
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f1dcd512e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f1dcd512ef0 RCX: 00007f1dcc77feba
RDX: 00000000200001c0 RSI: 0000000020000140 RDI: 00007f1dcd512eb0
RBP: 00000000200001c0 R08: 00007f1dcd512ef0 R09: 0000000000014000
R10: 0000000000014000 R11: 0000000000000246 R12: 0000000020000140
R13: 00007f1dcd512eb0 R14: 0000000000000293 R15: 0000000020000000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hfs_btree_open+0xf05/0xf20 fs/hfs/btree.c:41
Code: 7f ff e9 7e fa ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 9b fa ff ff 4c 89 f7 e8 a5 c1 7f ff e9 8e fa ff ff e8 5b 3e 28 ff <0f> 0b e8 54 3e 28 ff 0f 0b e8 4d 3e 28 ff 0f 0b 66 2e 0f 1f 84 00
RSP: 0018:ffffc9001a357798 EFLAGS: 00010287
RAX: ffffffff826254f5 RBX: ffff8880706c7360 RCX: 0000000000040000
RDX: ffffc90004faa000 RSI: 000000000000517c RDI: 000000000000517d
RBP: 0000000000000000 R08: ffffffff82624753 R09: ffffed100e0d8e88
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888028fb8000
R13: ffff88805b428008 R14: ffff88805b428000 R15: dffffc0000000000
FS: 00007f1dcd5136c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f748bb08ab8 CR3: 00000000203ef000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.