syzbot


WARNING in hfs_mdb_commit

Status: upstream: reported C repro on 2026/05/14 03:37
Subsystems: hfs
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+c149ad75e9633be0c1ad@syzkaller.appspotmail.com
First crash: 63d, last: 4d03h
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
97477e45-e511-4782-b619-85d2875def88 assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ✅ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ WARNING in hfs_mdb_commit 2026/05/22 03:37 2026/05/22 03:37 2026/05/22 04:30 d57425845dbe663f86e1e54a4997e95bd557b624

			
		
Discussions (2)
Title Replies (including bot) Last reply
[PATCH] hfs: don't re-dirty MDB buffers after a write failure 1 (1) 2026/07/09 22:50
[syzbot] [hfs?] WARNING in hfs_mdb_commit 1 (4) 2026/07/08 22:44
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in hfs_mdb_commit origin:upstream -1 C 4 28d 60d 0/3 upstream: reported C repro on 2026/05/13 17:28

Sample crash report:
------------[ cut here ]------------
!buffer_uptodate(bh)
WARNING: fs/buffer.c:1093 at mark_buffer_dirty+0x299/0x410 fs/buffer.c:1093, CPU#0: syz.1.1033/6784
Modules linked in:
CPU: 0 UID: 0 PID: 6784 Comm: syz.1.1033 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:mark_buffer_dirty+0x299/0x410 fs/buffer.c:1093
Code: 4c 89 f7 e8 f9 0d d9 ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 d4 5e fb ff e8 af e7 69 ff eb 8c e8 a8 e7 69 ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 9a e7 69 ff 90 0f 0b 90 e9 cf fd ff ff
RSP: 0018:ffffc90005d379a8 EFLAGS: 00010293
RAX: ffffffff825c9ae8 RBX: ffff8880123aa700 RCX: ffff888034a30000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 1ffff1100a45f401 R08: ffff8880123aa707 R09: 1ffff110024754e0
R10: dffffc0000000000 R11: ffffed10024754e1 R12: dffffc0000000000
R13: ffff8880522fa668 R14: ffff888045ba945b R15: ffff888045ba9400
FS:  000055556b366500(0000) GS:ffff88808c54e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31a63fff CR3: 0000000034b1d000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 hfs_mdb_commit+0x503/0x1160 fs/hfs/mdb.c:309
 hfs_sync_fs+0x1d/0x30 fs/hfs/super.c:38
 sync_filesystem+0x1cf/0x230 fs/sync.c:66
 fs_bdev_sync+0x2c/0x50 fs/super.c:1433
 blkdev_flushbuf block/ioctl.c:520 [inline]
 blkdev_common_ioctl+0x12e1/0x3250 block/ioctl.c:658
 blkdev_ioctl+0x528/0x740 block/ioctl.c:791
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 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: 0033:0x7f1d9239de59
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:00007fffd0ece148 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1d92625fa0 RCX: 00007f1d9239de59
RDX: 0000000000000000 RSI: 0000000000001261 RDI: 0000000000000004
RBP: 00007f1d92433e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1d92625fac R14: 00007f1d92625fa0 R15: 00007f1d92625fa0
 </TASK>

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/08 22:43 upstream 0e35b9b6ec0f ab40da58 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root WARNING in hfs_mdb_commit
2026/07/03 12:03 upstream 87320be9f0d2 58bf2096 .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root WARNING in hfs_mdb_commit
2026/07/08 21:01 upstream 0e35b9b6ec0f ab40da58 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in hfs_mdb_commit
2026/07/03 10:17 upstream 87320be9f0d2 58bf2096 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in hfs_mdb_commit
2026/05/10 03:33 upstream 1bfaee9d3351 29233ece .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in hfs_mdb_commit
* Struck through repros no longer work on HEAD.