syzbot


WARNING in jbd2_journal_dirty_metadata (3)

Status: upstream: reported on 2026/04/22 22:44
Subsystems: ext4
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+a5f824f1c49dd97fcff0@syzkaller.appspotmail.com
First crash: 82d, last: 12d
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
b9757149-06b8-4f93-b930-1242674468a3 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ✅ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ WARNING in jbd2_journal_dirty_metadata (3) 2026/05/21 06:44 2026/05/21 06:44 2026/05/21 07:27 cf874a1cf36318c06202027159ddac14acf00db7

			
		
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ext4?] WARNING in jbd2_journal_dirty_metadata (3) 0 (1) 2026/04/22 22:44
Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in jbd2_journal_dirty_metadata (2) ext4 -1 58 161d 405d 0/29 auto-obsoleted due to no activity on 2026/04/10 03:13
upstream WARNING in jbd2_journal_dirty_metadata ext4 -1 49 500d 668d 0/29 auto-obsoleted due to no activity on 2025/05/05 22:21

Sample crash report:
loop0: detected capacity change from 0 to 32768
JBD2: Ignoring recovery information on journal
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
------------[ cut here ]------------
jbd2_handle_buffer_credits(handle) <= 0
WARNING: fs/jbd2/transaction.c:1598 at jbd2_journal_dirty_metadata+0xb3b/0xea0 fs/jbd2/transaction.c:1598, CPU#0: syz.0.0/5329
Modules linked in:
CPU: 0 UID: 0 PID: 5329 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:jbd2_journal_dirty_metadata+0xb3b/0xea0 fs/jbd2/transaction.c:1598
Code: 44 24 28 44 8b 00 48 c7 c7 c0 81 e6 8b 89 de 44 89 ea 4c 89 f1 e8 85 43 85 fe b8 ea ff ff ff e9 62 fd ff ff e8 86 05 24 ff 90 <0f> 0b 90 b8 e4 ff ff ff e9 4f fd ff ff 44 89 e9 80 e1 07 80 c1 03
RSP: 0018:ffffc9000e46eae0 EFLAGS: 00010283
RAX: ffffffff82a26c8a RBX: 1ffff110087e35d0 RCX: 0000000000100000
RDX: ffffc9000ed72000 RSI: 000000000008d1af RDI: 000000000008d1b0
RBP: ffff888043f1ae88 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001c8dd4c R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888043ccdb60
FS:  00007efe0fc4f6c0(0000) GS:ffff88808c815000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000021c0 CR3: 000000003adeb000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_journal_dirty+0x130/0x6f0 fs/ocfs2/journal.c:835
 ocfs2_alloc_dinode_update_counts+0x16e/0x2d0 fs/ocfs2/suballoc.c:1768
 ocfs2_search_chain+0xe76/0x1e50 fs/ocfs2/suballoc.c:2024
 ocfs2_claim_suballoc_bits+0x901/0x1f40 fs/ocfs2/suballoc.c:2135
 __ocfs2_claim_clusters+0x31d/0x970 fs/ocfs2/suballoc.c:2562
 ocfs2_make_clusters_writable fs/ocfs2/refcounttree.c:3248 [inline]
 ocfs2_replace_cow+0x982/0x1c90 fs/ocfs2/refcounttree.c:3351
 ocfs2_refcount_cow_hunk fs/ocfs2/refcounttree.c:3429 [inline]
 ocfs2_refcount_cow+0x790/0xd40 fs/ocfs2/refcounttree.c:3472
 ocfs2_prepare_inode_for_write fs/ocfs2/file.c:2352 [inline]
 ocfs2_file_write_iter+0xf26/0x1f10 fs/ocfs2/file.c:2463
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x612/0xba0 fs/read_write.c:687
 ksys_write+0x150/0x270 fs/read_write.c:739
 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: 0033:0x7efe0ed9ce59
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:00007efe0fc4efe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007efe0f015fa0 RCX: 00007efe0ed9ce59
RDX: 0000000000000014 RSI: 0000200000000100 RDI: 0000000000000006
RBP: 00007efe0ee32e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efe0f016038 R14: 00007efe0f015fa0 R15: 00007fff89130c18
 </TASK>

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/27 17:59 upstream 5a66900afbd6 fb92f11c .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in jbd2_journal_dirty_metadata
2026/06/18 06:11 upstream e771677c937d b62b3ded .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in jbd2_journal_dirty_metadata
2026/06/14 06:43 upstream 2b07ea76fd28 4f06757f .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in jbd2_journal_dirty_metadata
2026/04/18 22:38 upstream eb5249b12507 303e2802 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in jbd2_journal_dirty_metadata
* Struck through repros no longer work on HEAD.