Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_iget

[syzbot <syzbot+5bdd4953bc58c8fbd6eb@syzkaller.appspotmail.com>]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in ocfs2_iget

(syz.0.17,6559,0):ocfs2_read_locked_inode:612 ERROR: Inode 66: system file state is ambiguous
------------[ cut here ]------------
kernel BUG at fs/ocfs2/inode.c:612!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 6559 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:ocfs2_read_locked_inode fs/ocfs2/inode.c:609 [inline]
RIP: 0010:ocfs2_iget+0x19a3/0x1a90 fs/ocfs2/inode.c:157
Code: bc 24 60 01 00 00 4c 8b 84 24 a0 01 00 00 4c 89 f7 48 c7 c6 f0 55 d7 8c ba 64 02 00 00 48 c7 c1 00 c9 0a 8b e8 9e 65 15 00 90 <0f> 0b e8 a6 cb 23 fe 90 0f 0b e8 9e cb 23 fe 31 f6 65 ff 0d 65 3f
RSP: 0018:ffffc90003f66d40 EFLAGS: 00010246
RAX: 8f703e25fe532600 RBX: ffffc90003f66e80 RCX: 8f703e25fe532600
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003f66fb0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed101710487b R12: ffff888044f6642c
R13: 1ffff920007ecdb0 R14: ffffc90003f66ea0 R15: 1000000000000000
FS:  00007f4a52cbe6c0(0000) GS:ffff888127012000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f45247a7000 CR3: 000000003fd50000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ocfs2_init_global_system_inodes+0x16c/0x660 fs/ocfs2/super.c:449
 ocfs2_initialize_super fs/ocfs2/super.c:2196 [inline]
 ocfs2_fill_super+0x447b/0x65f0 fs/ocfs2/super.c:993
 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691
 vfs_get_tree+0x92/0x2b0 fs/super.c:1751
 fc_mount fs/namespace.c:1208 [inline]
 do_new_mount_fc fs/namespace.c:3651 [inline]
 do_new_mount+0x302/0xa10 fs/namespace.c:3727
 do_mount fs/namespace.c:4050 [inline]
 __do_sys_mount fs/namespace.c:4238 [inline]
 __se_sys_mount+0x313/0x410 fs/namespace.c:4215
 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: 0033:0x7f4a5365066a
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:00007f4a52cbde68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f4a52cbdef0 RCX: 00007f4a5365066a
RDX: 0000200000004440 RSI: 00002000000000c0 RDI: 00007f4a52cbdeb0
RBP: 0000200000004440 R08: 00007f4a52cbdef0 R09: 00000000000008c0
R10: 00000000000008c0 R11: 0000000000000246 R12: 00002000000000c0
R13: 00007f4a52cbdeb0 R14: 0000000000004446 R15: 0000200000000240
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_read_locked_inode fs/ocfs2/inode.c:609 [inline]
RIP: 0010:ocfs2_iget+0x19a3/0x1a90 fs/ocfs2/inode.c:157
Code: bc 24 60 01 00 00 4c 8b 84 24 a0 01 00 00 4c 89 f7 48 c7 c6 f0 55 d7 8c ba 64 02 00 00 48 c7 c1 00 c9 0a 8b e8 9e 65 15 00 90 <0f> 0b e8 a6 cb 23 fe 90 0f 0b e8 9e cb 23 fe 31 f6 65 ff 0d 65 3f
RSP: 0018:ffffc90003f66d40 EFLAGS: 00010246
RAX: 8f703e25fe532600 RBX: ffffc90003f66e80 RCX: 8f703e25fe532600
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003f66fb0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed101710487b R12: ffff888044f6642c
R13: 1ffff920007ecdb0 R14: ffffc90003f66ea0 R15: 1000000000000000
FS:  00007f4a52cbe6c0(0000) GS:ffff888127012000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4524799000 CR3: 000000003fd50000 CR4: 00000000003526f0


Tested on:

commit:         552c5071 Merge tag 'vfio-v6.18-rc3' of https://github...
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=12a64614580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b1620e3721dc97c0
dashboard link: https://syzkaller.appspot.com/bug?extid=5bdd4953bc58c8fbd6eb
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=12b19b04580000