kernel BUG in ocfs2_xattr_value_truncate (3)

Status: upstream: reported on 2026/07/23 07:48
Subsystems: ocfs2
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+1542b94cc3d81b71110d@syzkaller.appspotmail.com
First crash: 5d02h, last: 5d02h
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
a1ac748d-b6a5-455f-b614-8d18faae022d assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ✅ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ kernel BUG in ocfs2_xattr_value_truncate (3) 2026/07/21 00:57 2026/07/21 00:57 2026/07/21 01:35 de6a700d843f1eae454018bc5041e06c62737db6

			
		
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ocfs2?] kernel BUG in ocfs2_xattr_value_truncate (3) 0 (1) 2026/07/23 07:48
Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in ocfs2_xattr_value_truncate ocfs2 -1 3 354d 401d 0/29 auto-obsoleted due to no activity on 2025/11/11 20:49
upstream kernel BUG in ocfs2_xattr_value_truncate (2) prio:high ocfs2 -1 3 125d 152d 0/29 auto-obsoleted due to no activity on 2026/06/29 04:34

Sample crash report:
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.
=======================================================
JBD2: Ignoring recovery information on journal
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
(syz.0.0,5327,0):ocfs2_dio_end_io:2420 ERROR: Direct IO failed, bytes = -28
------------[ cut here ]------------
kernel BUG at fs/ocfs2/xattr.c:747!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5327 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 04/01/2014
RIP: 0010:ocfs2_xattr_extend_allocation fs/ocfs2/xattr.c:747 [inline]
RIP: 0010:ocfs2_xattr_value_truncate+0x1738/0x1740 fs/ocfs2/xattr.c:868
Code: 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c be eb ff ff 4c 89 f7 48 89 f3 e8 d6 44 3d fe 48 89 de e9 ab eb ff ff e8 c9 19 ce fd 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:ffffc9000f78e940 EFLAGS: 00010283
RAX: ffffffff83f86807 RBX: 0000000000000002 RCX: 0000000000100000
RDX: ffffc9000ee51000 RSI: 0000000000001097 RDI: 0000000000001098
RBP: ffffc9000f78ec70 R08: ffff888000ec2540 R09: 0000000000000006
R10: 00000000fffffffc R11: 0000000000000002 R12: fffff52001ef1d3c
R13: 0000000000000002 R14: 00000000fffffff5 R15: ffff88805486a5d0
FS:  00007f4b34b836c0(0000) GS:ffff88808c549000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000f000 CR3: 0000000040786000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_xa_value_truncate+0x2d6/0x420 fs/ocfs2/xattr.c:1956
 ocfs2_xa_prepare_entry fs/ocfs2/xattr.c:2215 [inline]
 ocfs2_xa_set+0x23dd/0x2ef0 fs/ocfs2/xattr.c:2293
 ocfs2_xattr_block_set+0x3d2/0x3330 fs/ocfs2/xattr.c:3029
 __ocfs2_xattr_set_handle+0x6b2/0xf40 fs/ocfs2/xattr.c:3431
 ocfs2_xattr_set+0xf20/0x13a0 fs/ocfs2/xattr.c:3694
 __vfs_setxattr+0x442/0x480 fs/xattr.c:223
 __vfs_setxattr_noperm+0x12a/0x660 fs/xattr.c:257
 vfs_setxattr+0x163/0x360 fs/xattr.c:344
 do_setxattr fs/xattr.c:662 [inline]
 filename_setxattr+0x296/0x630 fs/xattr.c:690
 path_setxattrat+0x408/0x450 fs/xattr.c:734
 __do_sys_lsetxattr fs/xattr.c:775 [inline]
 __se_sys_lsetxattr fs/xattr.c:771 [inline]
 __x64_sys_lsetxattr+0xbf/0xe0 fs/xattr.c:771
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4b33d9de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4b34b82fe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd
RAX: ffffffffffffffda RBX: 00007f4b34025fa0 RCX: 00007f4b33d9de99
RDX: 0000200000000080 RSI: 00002000000000c0 RDI: 0000200000000100
RBP: 00007f4b33e33eaf R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fe37 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4b34026038 R14: 00007f4b34025fa0 R15: 00007ffd4526fe68
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_xattr_extend_allocation fs/ocfs2/xattr.c:747 [inline]
RIP: 0010:ocfs2_xattr_value_truncate+0x1738/0x1740 fs/ocfs2/xattr.c:868
Code: 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c be eb ff ff 4c 89 f7 48 89 f3 e8 d6 44 3d fe 48 89 de e9 ab eb ff ff e8 c9 19 ce fd 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:ffffc9000f78e940 EFLAGS: 00010283
RAX: ffffffff83f86807 RBX: 0000000000000002 RCX: 0000000000100000
RDX: ffffc9000ee51000 RSI: 0000000000001097 RDI: 0000000000001098
RBP: ffffc9000f78ec70 R08: ffff888000ec2540 R09: 0000000000000006
R10: 00000000fffffffc R11: 0000000000000002 R12: fffff52001ef1d3c
R13: 0000000000000002 R14: 00000000fffffff5 R15: ffff88805486a5d0
FS:  00007f4b34b836c0(0000) GS:ffff88808c549000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001480 CR3: 0000000040786000 CR4: 0000000000352ef0

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/19 07:39 upstream f2ec6312bf71 72524a66 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_xattr_value_truncate
2026/07/19 07:38 upstream f2ec6312bf71 72524a66 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_xattr_value_truncate
* Struck through repros no longer work on HEAD.