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WARNING in hfs_bnode_create

Status: upstream: reported C repro on 2023/04/02 22:27
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+628893e821712702f0ee@syzkaller.appspotmail.com
First crash: 1081d, last: 44m
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2025/08/25 linux-6.1.y (ToT) 0bc96de781b4 C [report] WARNING in hfs_bnode_create
2024/08/15 upstream (ToT) 1fb918967b56 C [report] WARNING in hfs_bnode_create
2025/08/25 upstream (ToT) 1b237f190eb3 C Didn't crash
▶ ▼ 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 8710 1h13m 2906d 0/29 upstream: reported C repro on 2018/04/04 03:02
linux-6.6 WARNING in hfs_bnode_create origin:upstream -1 C 238 4h59m 218d 0/2 upstream: reported C repro on 2025/08/13 16:31
linux-4.19 WARNING in hfs_bnode_create hfs -1 C 16 1113d 1209d 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 753 7d00h 1080d 0/3 upstream: reported C repro on 2023/04/04 01:35
linux-4.14 WARNING in hfs_bnode_create -1 C 2 1113d 1195d 0/1 upstream: reported C repro on 2022/12/10 13:46
▶ ▼ Fix bisection attempts (6)
Created Duration User Patch Repo Result
2025/10/14 18:55 1h45m fix candidate upstream OK (0) job log
2025/02/08 14:02 14m bisect fix linux-6.1.y error job log
2024/10/20 02:31 2h11m bisect fix linux-6.1.y OK (0) job log log
2024/09/18 03:23 1h42m bisect fix linux-6.1.y OK (0) job log log
2024/08/14 22:04 1h03m bisect fix linux-6.1.y OK (0) job log log
2023/10/18 16:01 1h33m bisect fix linux-6.1.y OK (0) job log log

Sample crash report:
hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 1 PID: 30 at fs/hfs/bnode.c:520 hfs_bnode_create+0x37a/0x400 fs/hfs/bnode.c:519
Modules linked in:
CPU: 1 PID: 30 Comm: kworker/u4:2 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:hfs_bnode_create+0x37a/0x400 fs/hfs/bnode.c:520
Code: aa a2 8a 89 ee e8 56 3b d6 07 e9 ab fd ff ff e8 4c 51 37 ff 48 89 df e8 04 8b eb 07 48 c7 c7 00 ab a2 8a 89 ee e8 36 3b d6 07 <0f> 0b eb b7 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c b7 fc ff ff 4c
RSP: 0018:ffffc90000a6ee80 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff8880196a00e0 RCX: 0907a32363c7b200
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc90000a6eb87 R09: 1ffff9200014dd70
R10: dffffc0000000000 R11: fffff5200014dd71 R12: 0000000000000000
R13: ffff8880196a0000 R14: ffff88807804e100 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0036c3440 CR3: 000000000c88e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x53d/0x5d0 fs/hfs/btree.c:291
 hfs_btree_inc_height+0xfd/0xac0 fs/hfs/brec.c:490
 hfs_brec_insert+0x744/0xbd0 fs/hfs/brec.c:148
 __hfs_ext_write_extent+0x2a1/0x470 fs/hfs/extent.c:124
 hfs_ext_write_extent+0x17b/0x200 fs/hfs/extent.c:144
 hfs_write_inode+0xd8/0xa20 fs/hfs/inode.c:434
 write_inode fs/fs-writeback.c:1470 [inline]
 __writeback_single_inode+0x75b/0x1160 fs/fs-writeback.c:1687
 writeback_sb_inodes+0xb30/0x1850 fs/fs-writeback.c:1913
 wb_writeback+0x482/0xd50 fs/fs-writeback.c:2087
 wb_do_writeback fs/fs-writeback.c:2230 [inline]
 wb_workfn+0x423/0xee0 fs/fs-writeback.c:2270
 process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Crashes (318):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/02/07 13:38 linux-6.1.y 0182cb5b74ee f20fc9f9 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2023/06/18 00:15 linux-6.1.y ca87e77a2ef8 f3921d4d .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2025/11/23 21:31 linux-6.1.y f6e38ae624cf 4fb8ef37 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 WARNING in hfs_bnode_create
2025/08/13 13:38 linux-6.1.y 3594f306da12 22ec1469 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 WARNING in hfs_bnode_create
2025/04/27 05:30 linux-6.1.y 535ec20c5027 c6b4fb39 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 WARNING in hfs_bnode_create
2025/04/12 07:25 linux-6.1.y 420102835862 0bd6db41 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 WARNING in hfs_bnode_create
2024/12/25 22:21 linux-6.1.y 29f02ec58a94 444551c4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 WARNING in hfs_bnode_create
2024/11/02 16:13 linux-6.1.y 7c15117f9468 f00eed24 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 WARNING in hfs_bnode_create
2024/02/08 14:10 linux-6.1.y f1bb70486c9c 6404acf9 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 WARNING in hfs_bnode_create
2023/10/23 03:37 linux-6.1.y 7d24402875c7 361b23dc .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 WARNING in hfs_bnode_create
2023/05/14 17:41 linux-6.1.y bf4ad6fa4e53 2b9ba477 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 WARNING in hfs_bnode_create
2023/05/29 14:44 linux-6.1.y a343b0dd87b4 cf184559 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/03/19 11:45 linux-6.1.y f2ddafa93a25 bd6dcb30 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/03/18 12:22 linux-6.1.y f2ddafa93a25 0199f9a1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/03/17 21:22 linux-6.1.y f2ddafa93a25 c8810548 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/03/17 08:53 linux-6.1.y f2ddafa93a25 c01bca74 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/03/16 20:59 linux-6.1.y f2ddafa93a25 0737c18f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/03/16 20:30 linux-6.1.y f2ddafa93a25 0737c18f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/03/12 11:01 linux-6.1.y f2ddafa93a25 4efadf07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/03/12 10:56 linux-6.1.y f2ddafa93a25 4efadf07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/03/11 17:48 linux-6.1.y f2ddafa93a25 2d88ab01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/03/11 15:22 linux-6.1.y f2ddafa93a25 2d88ab01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/03/11 14:32 linux-6.1.y f2ddafa93a25 2d88ab01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/03/11 08:40 linux-6.1.y f2ddafa93a25 86914af9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/03/02 02:39 linux-6.1.y 779f9571ac3e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/12 20:31 linux-6.1.y 8ce36b2849ef 504cb1bf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/12 00:49 linux-6.1.y 8ce36b2849ef 76a109e2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/11 15:54 linux-6.1.y 8ce36b2849ef 75707236 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/11 12:16 linux-6.1.y 0182cb5b74ee 75707236 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/10 23:59 linux-6.1.y 0182cb5b74ee 441e25b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/10 23:59 linux-6.1.y 0182cb5b74ee 441e25b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/10 11:27 linux-6.1.y 0182cb5b74ee 91d776d3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/09 23:17 linux-6.1.y 0182cb5b74ee 4ab09a02 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/09 11:00 linux-6.1.y 0182cb5b74ee df949cd9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/07 18:24 linux-6.1.y 0182cb5b74ee 4c131dc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/07 00:09 linux-6.1.y 0182cb5b74ee f20fc9f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/06 18:24 linux-6.1.y 0182cb5b74ee 97745f52 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/06 18:24 linux-6.1.y 0182cb5b74ee 97745f52 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/06 12:03 linux-6.1.y cd9b81672742 97745f52 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/05 22:08 linux-6.1.y cd9b81672742 f03c4191 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/05 10:15 linux-6.1.y cd9b81672742 4936e85c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/04 14:24 linux-6.1.y cd9b81672742 ea10c935 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/03 22:05 linux-6.1.y cd9b81672742 42b01fab .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/03 09:31 linux-6.1.y cd9b81672742 6df4c87a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/02 21:40 linux-6.1.y cd9b81672742 d78927dd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/02 21:40 linux-6.1.y cd9b81672742 d78927dd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/02 09:27 linux-6.1.y cd9b81672742 018ebef2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/02/01 14:35 linux-6.1.y cd9b81672742 6b8752f2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/01/20 14:27 linux-6.1.y cd9b81672742 06648d9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in hfs_bnode_create
2026/03/19 15:49 linux-6.1.y f2ddafa93a25 bd6dcb30 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in hfs_bnode_create
2026/03/19 10:33 linux-6.1.y f2ddafa93a25 0199f9a1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in hfs_bnode_create
2026/03/18 11:01 linux-6.1.y f2ddafa93a25 0199f9a1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in hfs_bnode_create
2026/03/18 11:00 linux-6.1.y f2ddafa93a25 0199f9a1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in hfs_bnode_create
2026/03/17 20:02 linux-6.1.y f2ddafa93a25 c8810548 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in hfs_bnode_create
2026/03/17 08:03 linux-6.1.y f2ddafa93a25 c01bca74 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in hfs_bnode_create
2026/03/17 04:58 linux-6.1.y f2ddafa93a25 0737c18f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in hfs_bnode_create
2026/02/08 08:28 linux-6.1.y 0182cb5b74ee 4c131dc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in hfs_bnode_create
2026/01/16 01:49 linux-6.1.y bec0e10ee67e d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in hfs_bnode_create
2026/01/15 21:18 linux-6.1.y bec0e10ee67e d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in hfs_bnode_create
2023/04/02 22:27 linux-6.1.y 3b29299e5f60 f325deb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in hfs_bnode_create
* Struck through repros no longer work on HEAD.