syzbot


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: 51d, last: 13d
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
c47fe495-6abf-464e-81b5-6396f76fb8fa 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 386cc6dacdf7e3ebce9507beed6755d7e999554d

			
		
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 C 112 350d 548d 0/29 auto-obsoleted due to no activity on 2025/10/04 07:06
upstream kernel BUG in ocfs2_page_mkwrite ocfs2 -1 1 654d 650d 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 182d 252d 0/29 auto-obsoleted due to no activity on 2026/05/01 16:22

Sample crash report:
(syz.0.0,5320,0):__ocfs2_journal_access:728 ERROR: Error -30 getting 1 access to buffer!
(syz.0.0,5320,0):ocfs2_write_end_nolock:1945 ERROR: status = -30
(syz.0.0,5320,0):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: 5320 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+0xb58/0xb60 fs/ocfs2/mmap.c:143
Code: ae 66 fe e9 2a fd ff ff e8 b5 e2 e7 07 e8 d0 90 f7 fd 4c 89 e7 48 c7 c6 a0 a4 13 8c e8 d1 2d 59 fd 90 0f 0b e8 b9 90 f7 fd 90 <0f> 0b cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900037bf960 EFLAGS: 00010293
RAX: ffffffff83cee157 RBX: 00000000ffffffe2 RCX: ffff88803469a540
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 00000000ffffffe2
RBP: ffffc900037bfaf0 R08: ffffffff90331df7 R09: 1ffffffff20663be
R10: dffffc0000000000 R11: fffffbfff20663bf R12: dffffc0000000000
R13: 0000000000005000 R14: 0000000000000000 R15: 0000000000001000
FS:  0000555565638540(0000) GS:ffff88808c815000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fed2e320edd CR3: 0000000042ee2000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 do_page_mkwrite+0x147/0x310 mm/memory.c:3684
 do_shared_fault mm/memory.c:5936 [inline]
 do_fault mm/memory.c:5998 [inline]
 do_pte_missing+0x757/0x34b0 mm/memory.c:4566
 handle_pte_fault mm/memory.c:6379 [inline]
 __handle_mm_fault mm/memory.c:6517 [inline]
 handle_mm_fault+0x1b36/0x3080 mm/memory.c:6686
 do_user_addr_fault+0x744/0x1340 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: 0033:0x7f20d816d749
Code: dd 00 01 74 a3 83 f9 c0 0f 87 59 fe ff ff 62 e1 fe 28 6f 4e 01 48 29 fe 48 83 c7 3f 49 8d 0c 10 48 83 e7 c0 48 01 fe 48 29 f9 <f3> a4 62 c1 fe 28 7f 00 62 c1 fe 28 7f 48 01 c3 0f 1f 80 00 00 00
RSP: 002b:00007ffde8a35278 EFLAGS: 00010206
RAX: 0000200000002040 RBX: 0000000000000004 RCX: 0000000000005f74
RDX: 0000000000005f74 RSI: 00007f20d7c08e30 RDI: 0000200000002040
RBP: fffffffffffffffe R08: 0000200000002040 R09: 0000000000000002
R10: 0000000000005f74 R11: 0000000000000002 R12: 00007ffde8a353a0
R13: 00007f20d841627c R14: 000000000001651f R15: 00007f20d8416270
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__ocfs2_page_mkwrite fs/ocfs2/mmap.c:106 [inline]
RIP: 0010:ocfs2_page_mkwrite+0xb58/0xb60 fs/ocfs2/mmap.c:143
Code: ae 66 fe e9 2a fd ff ff e8 b5 e2 e7 07 e8 d0 90 f7 fd 4c 89 e7 48 c7 c6 a0 a4 13 8c e8 d1 2d 59 fd 90 0f 0b e8 b9 90 f7 fd 90 <0f> 0b cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900037bf960 EFLAGS: 00010293
RAX: ffffffff83cee157 RBX: 00000000ffffffe2 RCX: ffff88803469a540
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 00000000ffffffe2
RBP: ffffc900037bfaf0 R08: ffffffff90331df7 R09: 1ffffffff20663be
R10: dffffc0000000000 R11: fffffbfff20663bf R12: dffffc0000000000
R13: 0000000000005000 R14: 0000000000000000 R15: 0000000000001000
FS:  0000555565638540(0000) GS:ffff88808c815000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fba9acd0e3a CR3: 0000000042ee2000 CR4: 0000000000352ef0

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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.