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kernel BUG in hfs_write_inode

Status: upstream: reported C repro on 2025/06/16 18:04
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+905e5e4c2be48752878c@syzkaller.appspotmail.com
First crash: 246d, last: 2h07m
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()

  
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2025/08/03 linux-6.6.y (ToT) 3a8ababb8b6a C [report] kernel BUG in hfs_write_inode
2025/06/19 upstream (ToT) fb4d33ab452e C [report] kernel BUG in hfs_write_inode
2025/08/03 upstream (ToT) 186f3edfdd41 C Didn't crash
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 kernel BUG in hfs_write_inode origin:upstream missing-backport -1 C inconclusive 19187 3h21m 1050d 0/3 upstream: reported C repro on 2023/04/04 07:01
linux-4.14 kernel BUG in hfs_write_inode hfs -1 C 3 1080d 1173d 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 1079d 1179d 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 15793 4h54m 1044d 0/3 upstream: reported C repro on 2023/04/10 13:50
upstream kernel BUG in hfs_write_inode hfs -1 C error 176064 now 1180d 0/29 upstream: reported C repro on 2022/11/25 09:45
▶ ▼ Fix bisection attempts (1)
Created Duration User Patch Repo Result
2025/12/31 11:28 7h34m fix candidate upstream OK (1) job log

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/hfs/inode.c:449!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 2909 Comm: kworker/u4:6 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:hfs_write_inode+0x7c4/0x7d0 fs/hfs/inode.c:449
Code: c7 c1 00 33 ef 96 80 e1 07 80 c1 03 38 c1 0f 8c 7d fe ff ff 48 c7 c7 00 33 ef 96 e8 36 b1 85 ff e9 6c fe ff ff e8 8c 42 2e ff <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 55 41 57 41 56 41
RSP: 0018:ffffc9000bd37360 EFLAGS: 00010293
RAX: ffffffff82575df4 RBX: ffff888021c60ea8 RCX: ffff88802b6a9e00
RDX: 0000000000000000 RSI: ffffffff8cf37340 RDI: 0000000000000000
RBP: ffffc9000bd374f0 R08: ffff88802b6a9e00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff920017a6e70 R14: ffff888021c60e58 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0c071909c0 CR3: 000000002fe92000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 write_inode fs/fs-writeback.c:1483 [inline]
 __writeback_single_inode+0x705/0xee0 fs/fs-writeback.c:1700
 writeback_sb_inodes+0x77c/0xef0 fs/fs-writeback.c:1926
 wb_writeback+0x450/0xba0 fs/fs-writeback.c:2105
 wb_do_writeback fs/fs-writeback.c:2252 [inline]
 wb_workfn+0x3ff/0xe20 fs/fs-writeback.c:2292
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 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>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hfs_write_inode+0x7c4/0x7d0 fs/hfs/inode.c:449
Code: c7 c1 00 33 ef 96 80 e1 07 80 c1 03 38 c1 0f 8c 7d fe ff ff 48 c7 c7 00 33 ef 96 e8 36 b1 85 ff e9 6c fe ff ff e8 8c 42 2e ff <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 55 41 57 41 56 41
RSP: 0018:ffffc9000bd37360 EFLAGS: 00010293
RAX: ffffffff82575df4 RBX: ffff888021c60ea8 RCX: ffff88802b6a9e00
RDX: 0000000000000000 RSI: ffffffff8cf37340 RDI: 0000000000000000
RBP: ffffc9000bd374f0 R08: ffff88802b6a9e00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff920017a6e70 R14: ffff888021c60e58 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0083ea000 CR3: 000000002daf8000 CR4: 00000000003506e0

Crashes (5694):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/11/27 07:12 linux-6.6.y 1e89a1be4fe9 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2025/09/26 09:13 linux-6.6.y 147338df3487 0abd0691 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2025/06/17 18:56 linux-6.6.y c2603c511feb cfebc887 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/17 21:07 linux-6.6.y 56865d9b7074 06ec4f7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/17 18:03 linux-6.6.y 56865d9b7074 06ec4f7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/17 16:53 linux-6.6.y 56865d9b7074 06ec4f7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/17 16:13 linux-6.6.y 56865d9b7074 06ec4f7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/17 07:28 linux-6.6.y 56865d9b7074 e439b951 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/17 07:07 linux-6.6.y 56865d9b7074 e439b951 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/17 05:47 linux-6.6.y 56865d9b7074 e439b951 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/17 05:47 linux-6.6.y 56865d9b7074 e439b951 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/16 20:52 linux-6.6.y ae462074fde3 5d52cba5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/16 17:10 linux-6.6.y ae462074fde3 5d52cba5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/16 16:03 linux-6.6.y ae462074fde3 5d52cba5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/16 15:29 linux-6.6.y ae462074fde3 5d52cba5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/16 13:32 linux-6.6.y ae462074fde3 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/16 12:00 linux-6.6.y ae462074fde3 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/16 11:20 linux-6.6.y ae462074fde3 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/13 22:46 linux-6.6.y 1b4ef5214f17 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/13 19:30 linux-6.6.y 1b4ef5214f17 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/13 19:27 linux-6.6.y 1b4ef5214f17 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/13 18:25 linux-6.6.y 1b4ef5214f17 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/13 18:15 linux-6.6.y 1b4ef5214f17 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/13 09:38 linux-6.6.y 1b4ef5214f17 6a673c50 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/13 06:45 linux-6.6.y 1b4ef5214f17 6a673c50 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/13 05:42 linux-6.6.y 1b4ef5214f17 6a673c50 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/13 05:37 linux-6.6.y 1b4ef5214f17 6a673c50 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/12 21:06 linux-6.6.y 1b4ef5214f17 504cb1bf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/12 18:07 linux-6.6.y 1b4ef5214f17 504cb1bf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/12 18:04 linux-6.6.y 1b4ef5214f17 504cb1bf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/12 17:03 linux-6.6.y 1b4ef5214f17 504cb1bf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/12 08:15 linux-6.6.y 1b4ef5214f17 76a109e2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/12 04:52 linux-6.6.y 1b4ef5214f17 76a109e2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/12 03:00 linux-6.6.y 1b4ef5214f17 76a109e2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/12 02:42 linux-6.6.y 1b4ef5214f17 76a109e2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/12 01:28 linux-6.6.y 1b4ef5214f17 76a109e2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/12 01:28 linux-6.6.y 1b4ef5214f17 76a109e2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/11 16:48 linux-6.6.y 1b4ef5214f17 75707236 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/11 16:48 linux-6.6.y 1b4ef5214f17 75707236 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/11 15:17 linux-6.6.y 1b4ef5214f17 75707236 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/11 12:51 linux-6.6.y c56aaf1a85ae 75707236 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/11 02:19 linux-6.6.y c56aaf1a85ae 441e25b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/11 02:00 linux-6.6.y c56aaf1a85ae 441e25b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/11 00:29 linux-6.6.y c56aaf1a85ae 441e25b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/11 00:12 linux-6.6.y c56aaf1a85ae 441e25b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/10 13:38 linux-6.6.y c56aaf1a85ae 91d776d3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2026/02/10 12:11 linux-6.6.y c56aaf1a85ae 91d776d3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
2025/06/16 18:04 linux-6.6.y c2603c511feb d1716036 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in hfs_write_inode
* Struck through repros no longer work on HEAD.