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WARNING in hfs_bnode_create

Status: upstream: reported C repro on 2023/04/04 01:35
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+ce523929d0f93927ba4f@syzkaller.appspotmail.com
First crash: 1206d, last: 16d
Fix commit to backport (bisect log) :
tree: upstream
commit 42b0ef01e6b5e9c77b383d32c25a0ec2a735d08a
Author: Arnd Bergmann <arnd@arndb.de>
Date: Fri Jul 11 08:46:51 2025 +0000

  block: fix FS_IOC_GETLBMD_CAP parsing in blkdev_common_ioctl()

  
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2025/04/29 linux-5.15.y (ToT) f7347f400572 C [report] WARNING in hfs_bnode_create
2023/05/09 upstream (ToT) ba0ad6ed89fd C [report] WARNING in hfs_bnode_create
2025/04/29 upstream (ToT) ca91b9500108 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 prio:high hfs -1 C done error 10909 9h31m 3032d 0/29 upstream: reported C repro on 2018/04/04 03:02
linux-6.6 WARNING in hfs_bnode_create origin:upstream missing-backport -1 C error 264 23d 343d 0/2 upstream: reported C repro on 2025/08/13 16:31
linux-4.19 WARNING in hfs_bnode_create hfs -1 C 16 1239d 1334d 0/1 upstream: reported C repro on 2022/11/26 06:17
linux-6.1 WARNING in hfs_bnode_create origin:upstream missing-backport -1 C inconclusive 557 39d 1207d 0/3 upstream: reported C repro on 2023/04/02 22:27
linux-4.14 WARNING in hfs_bnode_create -1 C 2 1238d 1320d 0/1 upstream: reported C repro on 2022/12/10 13:46
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2026/07/06 19:24 15m retest repro linux-5.15.y report log
2026/07/06 19:24 20m retest repro linux-5.15.y report log
2026/07/06 19:24 16m retest repro linux-5.15.y report log
2026/07/06 19:24 19m retest repro linux-5.15.y report log
2026/07/06 19:24 17m retest repro linux-5.15.y report log
2026/05/26 07:15 1h46m retest repro linux-5.15.y report log
2026/05/26 07:15 27m retest repro linux-5.15.y report log
2026/05/26 07:15 33m retest repro linux-5.15.y report log
2026/05/26 07:15 16m retest repro linux-5.15.y report log
2026/05/26 07:15 15m retest repro linux-5.15.y report log
▶ ▼ Fix bisection attempts (3)
Created Duration User Patch Repo Result
2025/12/14 13:19 6h55m fix candidate upstream OK (1) job log
2023/12/03 15:19 0m bisect fix linux-5.15.y error job log
2023/10/11 09:00 1h02m bisect fix linux-5.15.y OK (0) job log log

Sample crash report:
loop0: detected capacity change from 0 to 64
hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4324 at fs/hfs/bnode.c:530 hfs_bnode_create+0x3c7/0x450 fs/hfs/bnode.c:529
Modules linked in:
CPU: 0 PID: 4324 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:hfs_bnode_create+0x3c7/0x450 fs/hfs/bnode.c:530
Code: 93 3f 8a 89 ee e8 69 22 80 07 e9 61 fd ff ff e8 cf e2 49 ff 4c 89 ef e8 47 33 94 07 48 c7 c7 20 94 3f 8a 89 ee e8 49 22 80 07 <0f> 0b eb b7 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 6d fc ff ff 4c
RSP: 0018:ffffc9000350f018 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff88807435a000 RCX: 8ac8592151dfe700
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff8880b9133d7f R09: 1ffff110172267af
R10: dffffc0000000000 R11: ffffed10172267b0 R12: 0000000000000000
R13: ffff88807435a0e0 R14: ffff88807eb6e100 R15: dffffc0000000000
FS:  0000555576400500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f959092530 CR3: 000000007d66e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x5b6/0x670 fs/hfs/btree.c:288
 hfs_btree_inc_height+0xf6/0xac0 fs/hfs/brec.c:490
 hfs_brec_insert+0x13e/0xb70 fs/hfs/brec.c:77
 __hfs_ext_write_extent+0x2a3/0x470 fs/hfs/extent.c:124
 __hfs_ext_cache_extent+0x6e/0x9a0 fs/hfs/extent.c:174
 hfs_ext_read_extent fs/hfs/extent.c:202 [inline]
 hfs_extend_file+0x378/0x1380 fs/hfs/extent.c:401
 hfs_get_block+0x3fe/0xbe0 fs/hfs/extent.c:353
 __block_write_begin_int+0x565/0x15d0 fs/buffer.c:2012
 __block_write_begin fs/buffer.c:2062 [inline]
 block_write_begin fs/buffer.c:2122 [inline]
 cont_write_begin+0x598/0x7b0 fs/buffer.c:2471
 hfs_write_begin+0x92/0xe0 fs/hfs/inode.c:59
 generic_perform_write+0x2b6/0x550 mm/filemap.c:3785
 __generic_file_write_iter+0x261/0x4e0 mm/filemap.c:3912
 generic_file_write_iter+0xa6/0x1b0 mm/filemap.c:3944
 call_write_iter include/linux/fs.h:2173 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x748/0xd70 fs/read_write.c:594
 ksys_write+0x153/0x260 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fba5c56ce59
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:00007fffe4aca168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fba5c7e5fa0 RCX: 00007fba5c56ce59
RDX: 000000000208e24b RSI: 0000200000000040 RDI: 0000000000000004
RBP: 00007fba5c602e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fba5c7e5fac R14: 00007fba5c7e5fa0 R15: 00007fba5c7e5fa0
 </TASK>

Crashes (761):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/22 10:54 linux-5.15.y eceeec79dbc6 43bfcdb0 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/11 12:25 linux-5.15.y 91d48252ad4b 86914af9 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/06 21:32 linux-5.15.y 91d48252ad4b 41d8037d .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/05 09:23 linux-5.15.y 91d48252ad4b a9fe5c9e .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2025/12/25 06:34 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2025/05/08 21:08 linux-5.15.y 16fdf2c7111b dbf35fa1 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2024/11/17 07:15 linux-5.15.y d98fd109f827 cfe3a04a .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2024/08/07 03:12 linux-5.15.y 7e89efd3ae1c 1ef9fe42 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2024/08/02 21:09 linux-5.15.y 7e89efd3ae1c 1e9c4cf3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2024/07/20 03:40 linux-5.15.y 7c6d66f0266f 890ce4f3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2024/07/20 01:58 linux-5.15.y 7c6d66f0266f 890ce4f3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2024/05/19 19:48 linux-5.15.y 83655231580b c0f1611a .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2023/11/03 11:38 linux-5.15.y 12952a23a5da c4ac074c .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2023/06/09 08:06 linux-5.15.y d7af3e5ba454 058b3a5a .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2023/05/23 18:24 linux-5.15.y 9d6bde853685 4bce1a3e .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2023/04/29 19:26 linux-5.15.y f48aeeaaa64c 62df2017 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2025/05/24 15:12 linux-5.15.y 98f47d0e9b8c ed351ea7 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in hfs_bnode_create
2025/05/11 10:51 linux-5.15.y 3b8db0e4f263 77908e5f .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in hfs_bnode_create
2025/01/26 21:35 linux-5.15.y 003148680b79 9fbd772e .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in hfs_bnode_create
2024/03/23 07:43 linux-5.15.y b95c01af2113 0ea90952 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in hfs_bnode_create
2023/05/19 00:33 linux-5.15.y 9d6bde853685 3bb7af1d .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in hfs_bnode_create
2026/06/22 10:17 linux-5.15.y eceeec79dbc6 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/05/31 10:49 linux-5.15.y 241d66fa280c 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/05/10 04:56 linux-5.15.y de8dfb3f0278 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/05/03 21:47 linux-5.15.y ef251c45f1cd a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/04/25 21:30 linux-5.15.y b9d57c40a767 9c2d0995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/04/19 10:50 linux-5.15.y b9d57c40a767 303e2802 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/04/12 05:52 linux-5.15.y 91d48252ad4b 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/12 14:59 linux-5.15.y 91d48252ad4b 4efadf07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/12 00:47 linux-5.15.y 91d48252ad4b 2d88ab01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/11 17:19 linux-5.15.y 91d48252ad4b 2d88ab01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/11 14:31 linux-5.15.y 91d48252ad4b 2d88ab01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/11 14:29 linux-5.15.y 91d48252ad4b 2d88ab01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/11 01:58 linux-5.15.y 91d48252ad4b 86914af9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/10 14:02 linux-5.15.y 91d48252ad4b 4683d576 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/10 01:36 linux-5.15.y 91d48252ad4b 6972f302 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/09 13:27 linux-5.15.y 91d48252ad4b 176bead5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/08 21:16 linux-5.15.y 91d48252ad4b 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/08 10:56 linux-5.15.y 91d48252ad4b 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/08 00:20 linux-5.15.y 91d48252ad4b 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/06 04:26 linux-5.15.y 91d48252ad4b 31e9c887 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/05 12:04 linux-5.15.y 91d48252ad4b d20b04c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/04 14:09 linux-5.15.y 91d48252ad4b e6b6b96b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/04 11:53 linux-5.15.y 3330a8d33e08 e6b6b96b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/04 07:41 linux-5.15.y 3330a8d33e08 4180d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/03 13:26 linux-5.15.y 3330a8d33e08 4180d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/03 13:26 linux-5.15.y 3330a8d33e08 4180d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/03 00:47 linux-5.15.y 3330a8d33e08 28b83e23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/02 12:46 linux-5.15.y 3330a8d33e08 b9dd6534 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/02 04:27 linux-5.15.y 3330a8d33e08 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/02 03:21 linux-5.15.y 3330a8d33e08 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/02 01:44 linux-5.15.y 3330a8d33e08 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/02 01:44 linux-5.15.y 3330a8d33e08 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/03/01 09:22 linux-5.15.y 3330a8d33e08 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/01/27 12:49 linux-5.15.y 9eec9a14ee10 9a514c2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/01/24 02:19 linux-5.15.y 9eec9a14ee10 4f25b9b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/01/17 22:11 linux-5.15.y 68efe5a6c16a 20d37d28 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/01/16 08:11 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/01/10 19:26 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/01/09 01:58 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/01/07 21:34 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2026/01/07 10:20 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
2025/08/02 11:49 linux-5.15.y c79648372d02 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in hfs_bnode_create
2023/04/04 01:35 linux-5.15.y c957cbb87315 41147e3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hfs_bnode_create
* Struck through repros no longer work on HEAD.