Message-ID: <68528baa.a70a0220.2da58.0003.GAE@google.com>
Date: Wed, 18 Jun 2025 02:49:30 -0700
From: syzbot <syzbot+960091a6411f236f2f98@...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_xattr_value_truncate

Hello,

syzbot found the following issue on:

HEAD commit:    18531f4d1c8c Merge tag 'acpi-6.16-rc2' of git://git.kernel..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1139c5d4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3a936e3316f9e2dc
dashboard link: https://syzkaller.appspot.com/bug?extid=960091a6411f236f2f98
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6

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-18531f4d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/aa1e5854fc49/vmlinux-18531f4d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ca38347f64b2/bzImage-18531f4d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+960091a6411f236f2f98@...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 writeback data mode.
(syz.0.0,5331,0):ocfs2_dio_end_io:2398 ERROR: Direct IO failed, bytes = -28
getblk(): invalid block size 512 requested
logical block size: 2048
CPU: 0 UID: 0 PID: 5331 Comm: syz.0.0 Not tainted 6.16.0-rc1-syzkaller-00182-g18531f4d1c8c #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
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 __getblk_slow fs/buffer.c:1133 [inline]
 bdev_getblk+0x5b0/0x690 fs/buffer.c:1467
 __getblk include/linux/buffer_head.h:382 [inline]
 sb_getblk include/linux/buffer_head.h:388 [inline]
 ocfs2_read_blocks+0x533/0x1540 fs/ocfs2/buffer_head_io.c:236
 ocfs2_read_block fs/ocfs2/buffer_head_io.h:52 [inline]
 ocfs2_read_extent_block fs/ocfs2/alloc.c:934 [inline]
 __ocfs2_find_path+0x300/0x880 fs/ocfs2/alloc.c:1850
 ocfs2_find_path fs/ocfs2/alloc.c:1914 [inline]
 ocfs2_commit_truncate+0x4fb/0x21d0 fs/ocfs2/alloc.c:7276
 ocfs2_truncate_file+0xca2/0x1420 fs/ocfs2/file.c:509
 ocfs2_setattr+0x1520/0x1b40 fs/ocfs2/file.c:1212
 notify_change+0xb33/0xe40 fs/attr.c:552
 do_truncate+0x1a4/0x220 fs/open.c:68
 handle_truncate fs/namei.c:3508 [inline]
 do_open fs/namei.c:3891 [inline]
 path_openat+0x306c/0x3830 fs/namei.c:4046
 do_filp_open+0x1fa/0x410 fs/namei.c:4073
 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/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6c0a38e929
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:00007f6c0b245038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f6c0a5b5fa0 RCX: 00007f6c0a38e929
RDX: 0000000000000000 RSI: 0000000000000011 RDI: 00002000000002c0
RBP: 00007f6c0a410b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6c0a5b5fa0 R15: 00007fffa516ea98
 </TASK>
(syz.0.0,5331,0):ocfs2_read_blocks:239 ERROR: status = -12
(syz.0.0,5331,0):__ocfs2_find_path:1852 ERROR: status = -12
(syz.0.0,5331,0):ocfs2_commit_truncate:7278 ERROR: status = -12
(syz.0.0,5331,0):ocfs2_truncate_file:511 ERROR: status = -12
(syz.0.0,5331,0):ocfs2_setattr:1217 ERROR: status = -12
------------[ cut here ]------------
kernel BUG at fs/ocfs2/xattr.c:743!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5331 Comm: syz.0.0 Not tainted 6.16.0-rc1-syzkaller-00182-g18531f4d1c8c #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_xattr_extend_allocation fs/ocfs2/xattr.c:743 [inline]
RIP: 0010:ocfs2_xattr_value_truncate+0x1518/0x1520 fs/ocfs2/xattr.c:864
Code: 07 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 85 ed ff ff 48 89 df 49 89 f6 e8 46 43 74 fe 4c 89 f6 e9 72 ed ff ff e8 f9 cb 10 fe 90 <0f> 0b 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000d1de940 EFLAGS: 00010287
RAX: ffffffff83af9047 RBX: 00000000fffffff5 RCX: 0000000000100000
RDX: ffffc9000de2a000 RSI: 00000000000010dd RDI: 00000000000010de
RBP: ffffc9000d1dec70 R08: ffff888000eb2440 R09: 0000000000000006
R10: 00000000fffffffc R11: 0000000000000002 R12: ffff8880537353d0
R13: dffffc0000000000 R14: 0000000000000002 R15: 0000000000000003
FS:  00007f6c0b2456c0(0000) GS:ffff88808d252000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003000 CR3: 0000000043015000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ocfs2_xa_value_truncate+0x295/0x3d0 fs/ocfs2/xattr.c:1915
 ocfs2_xa_prepare_entry fs/ocfs2/xattr.c:2173 [inline]
 ocfs2_xa_set+0x2371/0x3050 fs/ocfs2/xattr.c:2251
 ocfs2_xattr_block_set+0x3c4/0x2bc0 fs/ocfs2/xattr.c:2985
 __ocfs2_xattr_set_handle+0x661/0xf20 fs/ocfs2/xattr.c:3387
 ocfs2_xattr_set+0xde8/0x11f0 fs/ocfs2/xattr.c:3650
 __vfs_setxattr+0x439/0x480 fs/xattr.c:200
 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:234
 vfs_setxattr+0x16b/0x2f0 fs/xattr.c:321
 do_setxattr fs/xattr.c:636 [inline]
 filename_setxattr+0x274/0x600 fs/xattr.c:665
 path_setxattrat+0x364/0x3a0 fs/xattr.c:713
 __do_sys_lsetxattr fs/xattr.c:754 [inline]
 __se_sys_lsetxattr fs/xattr.c:750 [inline]
 __x64_sys_lsetxattr+0xbf/0xe0 fs/xattr.c:750
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6c0a38e929
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:00007f6c0b245038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd
RAX: ffffffffffffffda RBX: 00007f6c0a5b5fa0 RCX: 00007f6c0a38e929
RDX: 0000200000000040 RSI: 00002000000000c0 RDI: 0000200000000100
RBP: 00007f6c0a410b39 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fe37 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6c0a5b5fa0 R15: 00007fffa516ea98
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_xattr_extend_allocation fs/ocfs2/xattr.c:743 [inline]
RIP: 0010:ocfs2_xattr_value_truncate+0x1518/0x1520 fs/ocfs2/xattr.c:864
Code: 07 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 85 ed ff ff 48 89 df 49 89 f6 e8 46 43 74 fe 4c 89 f6 e9 72 ed ff ff e8 f9 cb 10 fe 90 <0f> 0b 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000d1de940 EFLAGS: 00010287
RAX: ffffffff83af9047 RBX: 00000000fffffff5 RCX: 0000000000100000
RDX: ffffc9000de2a000 RSI: 00000000000010dd RDI: 00000000000010de
RBP: ffffc9000d1dec70 R08: ffff888000eb2440 R09: 0000000000000006
R10: 00000000fffffffc R11: 0000000000000002 R12: ffff8880537353d0
R13: dffffc0000000000 R14: 0000000000000002 R15: 0000000000000003
FS:  00007f6c0b2456c0(0000) GS:ffff88808d252000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003000 CR3: 0000000043015000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

Powered by blists - more mailing lists