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WARNING in hfs_bnode_create

Status: upstream: reported C repro on 2025/08/13 16:31
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+7aabff809b2149af6834@syzkaller.appspotmail.com
First crash: 251d, last: 15d
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2025/08/14 upstream (ToT) 24ea63ea3877 C [report] WARNING in hfs_bnode_create
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in hfs_bnode_create hfs -1 C done error 10277 1h17m 2939d 0/29 upstream: reported C repro on 2018/04/04 03:02
linux-4.19 WARNING in hfs_bnode_create hfs -1 C 16 1146d 1242d 0/1 upstream: reported C repro on 2022/11/26 06:17
linux-5.15 WARNING in hfs_bnode_create missing-backport origin:upstream -1 C done 755 2d06h 1113d 0/3 upstream: reported C repro on 2023/04/04 01:35
linux-6.1 WARNING in hfs_bnode_create origin:upstream missing-backport -1 C inconclusive 540 22m 1114d 0/3 upstream: reported C repro on 2023/04/02 22:27
linux-4.14 WARNING in hfs_bnode_create -1 C 2 1146d 1228d 0/1 upstream: reported C repro on 2022/12/10 13:46

Sample crash report:
hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 1 PID: 11 at fs/hfs/bnode.c:520 hfs_bnode_create+0x3b9/0x440 fs/hfs/bnode.c:519
Modules linked in:
CPU: 1 PID: 11 Comm: kworker/u4:0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:hfs_bnode_create+0x3b9/0x440 fs/hfs/bnode.c:520
Code: d4 e0 8a 89 ee e8 47 8c 1f 08 e9 73 fd ff ff e8 1d 1c 2d ff 4c 89 ef e8 45 bc 34 08 48 c7 c7 c0 d4 e0 8a 89 ee e8 27 8c 1f 08 <0f> 0b eb b7 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 7f fc ff ff 4c
RSP: 0018:ffffc90000106e18 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff88802cc90000 RCX: c72992df6af70000
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc90000106b27 R09: 1ffff92000020d64
R10: dffffc0000000000 R11: fffff52000020d65 R12: 0000000000000000
R13: ffff88802cc900e0 R14: ffff8880754a8e00 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe90f1cf50 CR3: 000000000cf32000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x541/0x5d0 fs/hfs/btree.c:326
 hfs_btree_inc_height+0x101/0xac0 fs/hfs/brec.c:490
 hfs_brec_insert+0x748/0xbd0 fs/hfs/brec.c:148
 __hfs_ext_write_extent+0x2a1/0x470 fs/hfs/extent.c:124
 hfs_ext_write_extent+0x17f/0x210 fs/hfs/extent.c:144
 hfs_write_inode+0xdc/0x880 fs/hfs/inode.c:434
 write_inode fs/fs-writeback.c:1483 [inline]
 __writeback_single_inode+0x705/0xec0 fs/fs-writeback.c:1700
 writeback_sb_inodes+0x7cd/0xf50 fs/fs-writeback.c:1926
 wb_writeback+0x46a/0xbf0 fs/fs-writeback.c:2105
 wb_do_writeback fs/fs-writeback.c:2252 [inline]
 wb_workfn+0x400/0xe60 fs/fs-writeback.c:2292
 process_one_work kernel/workqueue.c:2653 [inline]
 process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>

Crashes (261):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/03/07 11:35 linux-6.6.y 4fc00fe35d46 5cb44a80 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2025/08/13 20:38 linux-6.6.y 3a8ababb8b6a 22ec1469 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2025/08/14 10:39 linux-6.6.y 3a8ababb8b6a 22ec1469 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2025/08/13 22:12 linux-6.6.y 3a8ababb8b6a 22ec1469 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2025/08/13 18:05 linux-6.6.y 3a8ababb8b6a 22ec1469 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/04/05 21:15 linux-6.6.y c09fbcd31ae6 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/04/04 23:03 linux-6.6.y c09fbcd31ae6 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/25 08:36 linux-6.6.y 4fc00fe35d46 8ee77f7d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/24 12:57 linux-6.6.y 4fc00fe35d46 74e70d19 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/24 05:58 linux-6.6.y 4fc00fe35d46 baf8bf12 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/23 12:07 linux-6.6.y 4fc00fe35d46 4933dba2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/23 05:37 linux-6.6.y 4fc00fe35d46 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/23 04:10 linux-6.6.y 4fc00fe35d46 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/21 04:02 linux-6.6.y 4fc00fe35d46 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/20 15:35 linux-6.6.y 4fc00fe35d46 ac6f1dff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/20 03:18 linux-6.6.y 4fc00fe35d46 2f245add .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/19 11:33 linux-6.6.y 4fc00fe35d46 bd6dcb30 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/18 10:58 linux-6.6.y 4fc00fe35d46 0199f9a1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/17 20:21 linux-6.6.y 4fc00fe35d46 c8810548 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/17 08:16 linux-6.6.y 4fc00fe35d46 c01bca74 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/16 20:09 linux-6.6.y 4fc00fe35d46 0737c18f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/12 10:58 linux-6.6.y 4fc00fe35d46 4efadf07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/12 01:34 linux-6.6.y 4fc00fe35d46 2d88ab01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/11 17:56 linux-6.6.y 4fc00fe35d46 2d88ab01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/11 14:24 linux-6.6.y 4fc00fe35d46 2d88ab01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/11 14:23 linux-6.6.y 4fc00fe35d46 2d88ab01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/11 02:02 linux-6.6.y 4fc00fe35d46 86914af9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/10 19:19 linux-6.6.y 4fc00fe35d46 4683d576 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/10 06:35 linux-6.6.y 4fc00fe35d46 6972f302 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/09 14:03 linux-6.6.y 4fc00fe35d46 176bead5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/07 00:46 linux-6.6.y 4fc00fe35d46 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/06 12:32 linux-6.6.y 4fc00fe35d46 41d8037d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/06 00:23 linux-6.6.y 4fc00fe35d46 31e9c887 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/05 16:32 linux-6.6.y 4fc00fe35d46 d20b04c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/05 12:00 linux-6.6.y 682d8e2f892b d20b04c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/05 00:17 linux-6.6.y 682d8e2f892b a9fe5c9e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/05 00:17 linux-6.6.y 682d8e2f892b a9fe5c9e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/04 15:29 linux-6.6.y 682d8e2f892b e6b6b96b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/04 11:55 linux-6.6.y 7a137e9bfa0e e6b6b96b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/03 13:57 linux-6.6.y 7a137e9bfa0e 4180d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/03 01:02 linux-6.6.y 7a137e9bfa0e 28b83e23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/02 13:06 linux-6.6.y 7a137e9bfa0e b9dd6534 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/02 01:51 linux-6.6.y 7a137e9bfa0e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/02 01:46 linux-6.6.y 7a137e9bfa0e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/03/01 08:46 linux-6.6.y 7a137e9bfa0e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/02/16 03:22 linux-6.6.y 1b4ef5214f17 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2026/02/04 16:40 linux-6.6.y 2cf6f68313dc ea10c935 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
2025/08/13 16:31 linux-6.6.y 3a8ababb8b6a 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hfs_bnode_create
* Struck through repros no longer work on HEAD.