Message-ID: <68f0cdf5.050a0220.91a22.0409.GAE@google.com>
Date: Thu, 16 Oct 2025 03:50:29 -0700
From: syzbot <syzbot+53383c9029311788bacc@...kaller.appspotmail.com>
To: jlbec@...lplan.org, joseph.qi@...ux.alibaba.com, 
	linux-kernel@...r.kernel.org, mark@...heh.com, ocfs2-devel@...ts.linux.dev, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [ocfs2?] kernel BUG in ocfs2_dinode_sanity_check

Hello,

syzbot found the following issue on:

HEAD commit:    98906f9d850e Merge tag 'rtc-6.18' of git://git.kernel.org/..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=120a3892580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c2d7b4143707d3a0
dashboard link: https://syzkaller.appspot.com/bug?extid=53383c9029311788bacc
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

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

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-98906f9d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d82186923244/vmlinux-98906f9d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a23e980d2d8e/bzImage-98906f9d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+53383c9029311788bacc@...kaller.appspotmail.com

loop0: detected capacity change from 0 to 32768
=======================================================
WARNING: The mand mount option has been deprecated and
         and is ignored by this kernel. Remove the mand
         option from the mount to silence this warning.
=======================================================
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
(syz.0.0,5378,0):ocfs2_check_set_options:1244 ERROR: Invalid heartbeat mount options
loop0: detected capacity change from 32768 to 32752
OCFS2: ERROR (device loop0): int ocfs2_validate_inode_block(struct super_block *, struct buffer_head *): Invalid dinode #17059: signature = 
On-disk corruption discovered. Please run fsck.ocfs2 once the filesystem is unmounted.
OCFS2: File system is now read-only.
(syz.0.0,5378,0):ocfs2_assign_bh:2417 ERROR: status = -30
(syz.0.0,5378,0):ocfs2_inode_lock_full_nested:2512 ERROR: status = -30
(syz.0.0,5378,0):ocfs2_inode_lock_tracker:2694 ERROR: status = -30
(syz.0.0,5378,0):ocfs2_xattr_get:1335 ERROR: status = -30
------------[ cut here ]------------
kernel BUG at fs/ocfs2/alloc.c:238!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5378 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:ocfs2_dinode_sanity_check+0x8e/0x90 fs/ocfs2/alloc.c:238
Code: ff 89 c6 e8 94 f7 21 fe 85 db 75 18 e8 4b f3 21 fe 31 c0 5b 41 5e e9 51 84 b2 07 cc e8 3b f3 21 fe 90 0f 0b e8 33 f3 21 fe 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa
RSP: 0018:ffffc9000d2c63a8 EFLAGS: 00010283
RAX: ffffffff839e605d RBX: 00000000ffffffff RCX: 0000000000100000
RDX: ffffc9000e172000 RSI: 0000000000003cbb RDI: 0000000000003cbc
RBP: ffffc9000d2c6570 R08: ffff888000eb8000 R09: 0000000000000006
R10: 00000000fffffffc R11: ffffffff839e5fd0 R12: ffff88803209a790
R13: 1ffff92001a58c84 R14: dffffc0000000000 R15: ffffc9000d2c7160
FS:  00007f71f71ed6c0(0000) GS:ffff88808d301000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f71f71cbfc8 CR3: 0000000042704000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_et_sanity_check fs/ocfs2/alloc.c:558 [inline]
 ocfs2_remove_rightmost_path+0xfd/0x990 fs/ocfs2/alloc.c:3040
 ocfs2_rotate_tree_left+0x742/0xd40 fs/ocfs2/alloc.c:3225
 ocfs2_truncate_rec+0x1411/0x1af0 fs/ocfs2/alloc.c:5510
 ocfs2_remove_extent+0xdfc/0x2020 fs/ocfs2/alloc.c:5589
 ocfs2_remove_btree_range+0xdef/0x1540 fs/ocfs2/alloc.c:5778
 ocfs2_commit_truncate+0xb64/0x21d0 fs/ocfs2/alloc.c:7372
 ocfs2_truncate_file+0xca2/0x1420 fs/ocfs2/file.c:509
 ocfs2_setattr+0x1520/0x1b40 fs/ocfs2/file.c:1212
 notify_change+0xc1a/0xf40 fs/attr.c:546
 do_truncate+0x1a4/0x220 fs/open.c:68
 handle_truncate fs/namei.c:3596 [inline]
 do_open fs/namei.c:3979 [inline]
 path_openat+0x306c/0x3830 fs/namei.c:4134
 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_creat fs/open.c:1530 [inline]
 __se_sys_creat fs/open.c:1524 [inline]
 __x64_sys_creat+0x8f/0xc0 fs/open.c:1524
 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: 0033:0x7f71fad8eec9
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:00007f71f71ed038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f71fafe5fa0 RCX: 00007f71fad8eec9
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000200000000080
RBP: 00007f71fae11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f71fafe6038 R14: 00007f71fafe5fa0 R15: 00007ffdd473cfa8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_dinode_sanity_check+0x8e/0x90 fs/ocfs2/alloc.c:238
Code: ff 89 c6 e8 94 f7 21 fe 85 db 75 18 e8 4b f3 21 fe 31 c0 5b 41 5e e9 51 84 b2 07 cc e8 3b f3 21 fe 90 0f 0b e8 33 f3 21 fe 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa
RSP: 0018:ffffc9000d2c63a8 EFLAGS: 00010283
RAX: ffffffff839e605d RBX: 00000000ffffffff RCX: 0000000000100000
RDX: ffffc9000e172000 RSI: 0000000000003cbb RDI: 0000000000003cbc
RBP: ffffc9000d2c6570 R08: ffff888000eb8000 R09: 0000000000000006
R10: 00000000fffffffc R11: ffffffff839e5fd0 R12: ffff88803209a790
R13: 1ffff92001a58c84 R14: dffffc0000000000 R15: ffffc9000d2c7160
FS:  00007f71f71ed6c0(0000) GS:ffff88808d301000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f71f71cbfc8 CR3: 0000000042704000 CR4: 0000000000352ef0


---
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