kernel BUG in ocfs2_page_mkwrite (4)

Status: upstream: reported on 2026/05/25 05:10
Subsystems: ocfs2
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+42984127d45ad96219de@syzkaller.appspotmail.com
First crash: 98d, last: 1d21h
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision
c47fe495 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ✅ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ kernel BUG in ocfs2_page_mkwrite (4) 2026/06/02 04:36 2026/06/02 04:36 2026/06/02 04:40 386cc6da
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ocfs2?] kernel BUG in ocfs2_page_mkwrite (4) 0 (1) 2026/05/25 05:10
Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in ocfs2_page_mkwrite (2) ocfs2 -1 syz, C 112 397d 594d 0/29 auto-obsoleted due to no activity on 2025/10/04 07:06
upstream kernel BUG in ocfs2_page_mkwrite ocfs2 -1 1 701d 697d 0/29 auto-obsoleted due to no activity on 2025/01/03 15:18
upstream kernel BUG in ocfs2_page_mkwrite (3) ocfs2 -1 4 228d 299d 0/29 auto-obsoleted due to no activity on 2026/05/01 16:22

Sample crash report:
(syz.0.0,5319,0):__ocfs2_journal_access:728 ERROR: Error -30 getting 1 access to buffer!
(syz.0.0,5319,0):ocfs2_write_end_nolock:1945 ERROR: status = -30
(syz.0.0,5319,0):ocfs2_commit_trans:401 ERROR: status = -5
------------[ cut here ]------------
kernel BUG at fs/ocfs2/mmap.c:106!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5319 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_page_mkwrite fs/ocfs2/mmap.c:106 [inline]
RIP: 0010:ocfs2_page_mkwrite+0xb5e/0xb60 fs/ocfs2/mmap.c:143
Code: 31 4b fe e9 27 fd ff ff e8 2f 88 f0 07 e8 5a e9 d9 fd 4c 89 e7 48 c7 c6 a0 d9 55 8c e8 8b d2 3a fd 90 0f 0b e8 43 e9 d9 fd 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:ffffc9000edbf960 EFLAGS: 00010293
RAX: ffffffff83ed4b7d RBX: 00000000ffffffe2 RCX: ffff88801fbacb00
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 00000000ffffffe2
RBP: ffffc9000edbfaf0 R08: ffffffff9078fa37 R09: 1ffffffff20f1f46
R10: dffffc0000000000 R11: fffffbfff20f1f47 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000001000
FS:  00005555844bd540(0000) GS:ffff88808c30a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000460 CR3: 000000001f825000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 do_page_mkwrite+0x147/0x310 mm/memory.c:3754
 do_shared_fault mm/memory.c:6014 [inline]
 do_fault mm/memory.c:6076 [inline]
 do_pte_missing+0x757/0x34b0 mm/memory.c:4638
 handle_pte_fault mm/memory.c:6496 [inline]
 __handle_mm_fault mm/memory.c:6645 [inline]
 handle_mm_fault+0x19f5/0x3720 mm/memory.c:6814
 do_user_addr_fault+0x746/0x1340 arch/x86/mm/fault.c:1394
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f6df076e85f
Code: fe 48 8d 54 11 80 0f 1f 44 00 00 62 e1 fe 28 6f 0e 62 e1 fe 28 6f 56 01 62 e1 fe 28 6f 5e 02 62 e1 fe 28 6f 66 03 48 83 ee 80 <62> e1 fd 28 7f 0f 62 e1 fd 28 7f 57 01 62 e1 fd 28 7f 5f 02 62 e1
RSP: 002b:00007ffcac9ede98 EFLAGS: 00010207
RAX: 0000200000000440 RBX: 0000000000000004 RCX: 0000200000000440
RDX: 00002000000004c3 RSI: 00007f6df020d372 RDI: 0000200000000460
RBP: fffffffffffffffe R08: 0000000000000000 R09: 0000000000000001
R10: 7ffffffffffffefc R11: 0000000000000009 R12: 00007ffcac9edfc0
R13: 00007f6df0a25fac R14: 0000000000016e03 R15: 00007f6df0a25fa0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__ocfs2_page_mkwrite fs/ocfs2/mmap.c:106 [inline]
RIP: 0010:ocfs2_page_mkwrite+0xb5e/0xb60 fs/ocfs2/mmap.c:143
Code: 31 4b fe e9 27 fd ff ff e8 2f 88 f0 07 e8 5a e9 d9 fd 4c 89 e7 48 c7 c6 a0 d9 55 8c e8 8b d2 3a fd 90 0f 0b e8 43 e9 d9 fd 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:ffffc9000edbf960 EFLAGS: 00010293
RAX: ffffffff83ed4b7d RBX: 00000000ffffffe2 RCX: ffff88801fbacb00
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 00000000ffffffe2
RBP: ffffc9000edbfaf0 R08: ffffffff9078fa37 R09: 1ffffffff20f1f46
R10: dffffc0000000000 R11: fffffbfff20f1f47 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000001000
FS:  00005555844bd540(0000) GS:ffff88808c30a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000460 CR3: 000000001f825000 CR4: 0000000000352ef0

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/25 19:43 upstream 818bebeb63dd a9a1fc32 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_page_mkwrite
2026/07/29 18:47 upstream fc02acf6ac0c b63596d1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_page_mkwrite
2026/07/24 21:40 upstream 48a5a7ab8d6a dd737a83 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_page_mkwrite
2026/07/24 21:40 upstream 48a5a7ab8d6a dd737a83 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_page_mkwrite
2026/07/21 20:00 upstream b95f03f04d47 7c5de9c3 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_page_mkwrite
2026/07/21 20:00 upstream b95f03f04d47 7c5de9c3 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_page_mkwrite
2026/07/21 20:00 upstream b95f03f04d47 7c5de9c3 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_page_mkwrite
2026/07/17 13:35 upstream fce2dfa773ce 7f27c57a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_page_mkwrite
2026/07/15 22:43 upstream 58717b2a1365 27a8bd60 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_page_mkwrite
2026/06/28 03:08 upstream 780d569e6c4b fb92f11c .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_page_mkwrite
2026/06/27 10:38 upstream 5a66900afbd6 fb92f11c .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_page_mkwrite
2026/06/27 10:37 upstream 5a66900afbd6 fb92f11c .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_page_mkwrite
2026/06/27 10:36 upstream 5a66900afbd6 fb92f11c .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_page_mkwrite
2026/06/27 10:36 upstream 5a66900afbd6 fb92f11c .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_page_mkwrite
2026/05/21 05:02 upstream df685633c3db 41b8c833 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_page_mkwrite
* Struck through repros no longer work on HEAD.