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kernel BUG in hfs_write_inode

Status: upstream: reported C repro on 2023/04/04 07:01
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+c5103cae7270551db1e6@syzkaller.appspotmail.com
First crash: 1055d, last: 45m
Fix bisection: the issue occurs on the latest tested release (bisect log)
Crash: kernel BUG in hfs_write_inode (log)
Repro: C syz .config
  
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2025/09/17 linux-6.1.y (ToT) 3db754f56897 C [report] kernel BUG in hfs_write_inode
2025/01/05 upstream (ToT) ab75170520d4 C [report] kernel BUG in hfs_write_inode
2025/09/17 upstream (ToT) 5aca7966d2a7 C Didn't crash
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 kernel BUG in hfs_write_inode hfs -1 C 3 1085d 1177d 0/1 upstream: reported C repro on 2022/12/02 20:03
linux-4.19 kernel BUG in hfs_write_inode hfs -1 C 24 1083d 1184d 0/1 upstream: reported C repro on 2022/11/26 01:52
linux-5.15 kernel BUG in hfs_write_inode origin:upstream -1 C error 15930 2h26m 1049d 0/3 upstream: reported C repro on 2023/04/10 13:50
linux-6.6 kernel BUG in hfs_write_inode origin:upstream missing-backport -1 C done 5894 10h20m 251d 0/2 upstream: reported C repro on 2025/06/16 18:04
upstream kernel BUG in hfs_write_inode hfs -1 C error 177440 5m 1185d 0/29 upstream: reported C repro on 2022/11/25 09:45
▶ ▼ Fix bisection attempts (3)
Created Duration User Patch Repo Result
2025/10/06 08:26 2h06m fix candidate upstream OK (0) job log
2023/12/10 16:32 1h16m bisect fix linux-6.1.y OK (0) job log log
2023/10/11 06:24 1h13m bisect fix linux-6.1.y OK (0) job log log

Sample crash report:
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
------------[ cut here ]------------
kernel BUG at fs/hfs/inode.c:449!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 41 Comm: kworker/u4:2 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:hfs_write_inode+0x964/0x970 fs/hfs/inode.c:449
Code: 88 ff e9 13 fe ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 5e fe ff ff 4c 89 f7 e8 b6 ab 88 ff e9 51 fe ff ff e8 7c 8a 38 ff <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 55 41 57 41 56 41 54 53 48 89
RSP: 0018:ffffc90000b273a0 EFLAGS: 00010293
RAX: ffffffff82484614 RBX: ffff8880798c9518 RCX: ffff88801d681dc0
RDX: 0000000000000000 RSI: ffffffff8cd23360 RDI: 0000000000000005
RBP: ffffc90000b27530 R08: ffff88801d681dc0 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff92000164e78 R14: 0000000000000005 R15: ffff8880798c94d8
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffbfbd7cf8 CR3: 000000005c55f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 write_inode fs/fs-writeback.c:1460 [inline]
 __writeback_single_inode+0x75b/0x1160 fs/fs-writeback.c:1677
 writeback_sb_inodes+0xad8/0x17d0 fs/fs-writeback.c:1903
 wb_writeback+0x468/0xd00 fs/fs-writeback.c:2077
 wb_do_writeback fs/fs-writeback.c:2220 [inline]
 wb_workfn+0x435/0xec0 fs/fs-writeback.c:2260
 process_one_work+0x898/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hfs_write_inode+0x964/0x970 fs/hfs/inode.c:449
Code: 88 ff e9 13 fe ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 5e fe ff ff 4c 89 f7 e8 b6 ab 88 ff e9 51 fe ff ff e8 7c 8a 38 ff <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 55 41 57 41 56 41 54 53 48 89
RSP: 0018:ffffc90000b273a0 EFLAGS: 00010293
RAX: ffffffff82484614 RBX: ffff8880798c9518 RCX: ffff88801d681dc0
RDX: 0000000000000000 RSI: ffffffff8cd23360 RDI: 0000000000000005
RBP: ffffc90000b27530 R08: ffff88801d681dc0 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff92000164e78 R14: 0000000000000005 R15: ffff8880798c94d8
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffbfbd7cf8 CR3: 000000007e698000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (19397):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/09/13 13:21 linux-6.1.y 3db754f56897 e2beed91 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2025/01/02 05:44 linux-6.1.y 563edd786f0a d3ccff63 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/16 04:23 linux-6.1.y 8ce36b2849ef 1e62d198 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2025/11/07 13:54 linux-6.1.y f6e38ae624cf 4e1406b4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2025/08/30 16:52 linux-6.1.y f89b6e15694c 807a3b61 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2025/08/24 07:14 linux-6.1.y 0bc96de781b4 bf27483f .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2025/07/29 03:02 linux-6.1.y 3594f306da12 6654ea9c .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2025/05/01 08:12 linux-6.1.y 535ec20c5027 ce7952f4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2025/01/20 09:50 linux-6.1.y f4f677285b38 f2cb035c .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2024/03/19 21:29 linux-6.1.y d7543167affd e104824c .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2024/02/26 23:50 linux-6.1.y 81e1dc2f7001 da36a36b .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2023/11/10 15:14 linux-6.1.y fb2635ac69ab 45e9b83e .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2023/05/22 08:07 linux-6.1.y fa74641fb6b9 4bce1a3e .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2023/06/24 03:16 linux-6.1.y e84a4e368abe 79782afc .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/22 15:15 linux-6.1.y 779f9571ac3e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/22 15:11 linux-6.1.y 779f9571ac3e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/22 05:58 linux-6.1.y 779f9571ac3e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/22 05:42 linux-6.1.y 779f9571ac3e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/20 21:24 linux-6.1.y 779f9571ac3e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/20 20:01 linux-6.1.y 779f9571ac3e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/20 09:08 linux-6.1.y 779f9571ac3e 17d780d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/20 09:08 linux-6.1.y 779f9571ac3e 17d780d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/20 07:46 linux-6.1.y 779f9571ac3e 17d780d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/20 04:03 linux-6.1.y 779f9571ac3e c8d8c52d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/19 20:43 linux-6.1.y 779f9571ac3e c8d8c52d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/19 19:19 linux-6.1.y 779f9571ac3e c8d8c52d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/19 10:17 linux-6.1.y 8ce36b2849ef 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/19 06:47 linux-6.1.y 8ce36b2849ef 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/19 06:47 linux-6.1.y 8ce36b2849ef 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/19 05:12 linux-6.1.y 8ce36b2849ef 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/18 20:04 linux-6.1.y 8ce36b2849ef 77d4d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/18 17:43 linux-6.1.y 8ce36b2849ef 77d4d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/18 16:01 linux-6.1.y 8ce36b2849ef 77d4d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/18 06:29 linux-6.1.y 8ce36b2849ef 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/18 05:06 linux-6.1.y 8ce36b2849ef 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/17 19:53 linux-6.1.y 8ce36b2849ef 06ec4f7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/17 18:16 linux-6.1.y 8ce36b2849ef 06ec4f7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/17 17:11 linux-6.1.y 8ce36b2849ef 06ec4f7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/17 17:08 linux-6.1.y 8ce36b2849ef 06ec4f7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/02/22 17:50 linux-6.1.y 779f9571ac3e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/02/22 13:06 linux-6.1.y 779f9571ac3e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/02/22 08:52 linux-6.1.y 779f9571ac3e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/02/22 07:28 linux-6.1.y 779f9571ac3e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/02/22 04:13 linux-6.1.y 779f9571ac3e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/02/22 02:30 linux-6.1.y 779f9571ac3e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/02/22 01:09 linux-6.1.y 779f9571ac3e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/02/22 00:17 linux-6.1.y 779f9571ac3e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/02/21 15:59 linux-6.1.y 779f9571ac3e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/02/20 18:33 linux-6.1.y 779f9571ac3e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/02/20 06:31 linux-6.1.y 779f9571ac3e 17d780d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/02/19 18:07 linux-6.1.y 779f9571ac3e c8d8c52d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/02/19 16:31 linux-6.1.y 779f9571ac3e 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/02/19 03:55 linux-6.1.y 8ce36b2849ef 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/02/19 02:55 linux-6.1.y 8ce36b2849ef 77d4d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/02/19 01:30 linux-6.1.y 8ce36b2849ef 77d4d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/02/19 00:33 linux-6.1.y 8ce36b2849ef 77d4d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/02/18 23:26 linux-6.1.y 8ce36b2849ef 77d4d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/02/18 08:17 linux-6.1.y 8ce36b2849ef 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2023/04/04 07:01 linux-6.1.y 3b29299e5f60 41147e3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
* Struck through repros no longer work on HEAD.