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: 1244d, last: 5h20m
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 syz, C 3 1274d 1367d 0/1 upstream: reported C repro on 2022/12/02 20:03
linux-4.19 kernel BUG in hfs_write_inode hfs -1 syz, C 24 1273d 1373d 0/1 upstream: reported C repro on 2022/11/26 01:52
linux-5.15 kernel BUG in hfs_write_inode origin:upstream -1 syz, C error 21569 2d00h 1238d 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 syz, C done 13094 2d00h 440d 0/2 upstream: reported C repro on 2025/06/16 18:04
upstream kernel BUG in hfs_write_inode prio:high hfs -1 syz, C error 243695 12d 1374d 25/29 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
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
------------[ cut here ]------------
kernel BUG at fs/hfs/inode.c:449!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 11 Comm: kworker/u4:1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:hfs_write_inode+0xa1a/0xa20 fs/hfs/inode.c:449
Code: 87 ff e9 09 fe ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 54 fe ff ff 4c 89 f7 e8 b0 0a 87 ff e9 47 fe ff ff e8 76 fe 35 ff <0f> 0b 0f 1f 40 00 55 41 57 41 56 41 54 53 48 89 fb 49 bf 00 00 00
RSP: 0018:ffffc900001073a0 EFLAGS: 00010293
RAX: ffffffff824c76da RBX: ffff888079210e98 RCX: ffff88813fe73b80
RDX: 0000000000000000 RSI: ffffffff8cd255e0 RDI: 0000000000000000
RBP: ffffc90000107530 R08: ffff88813fe73b80 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff92000020e78 R14: 0000000000000000 R15: ffff888079210e58
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000030e11bff54b8 CR3: 000000002ed06000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 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>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hfs_write_inode+0xa1a/0xa20 fs/hfs/inode.c:449
Code: 87 ff e9 09 fe ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 54 fe ff ff 4c 89 f7 e8 b0 0a 87 ff e9 47 fe ff ff e8 76 fe 35 ff <0f> 0b 0f 1f 40 00 55 41 57 41 56 41 54 53 48 89 fb 49 bf 00 00 00
RSP: 0018:ffffc900001073a0 EFLAGS: 00010293
RAX: ffffffff824c76da RBX: ffff888079210e98 RCX: ffff88813fe73b80
RDX: 0000000000000000 RSI: ffffffff8cd255e0 RDI: 0000000000000000
RBP: ffffc90000107530 R08: ffff88813fe73b80 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff92000020e78 R14: 0000000000000000 R15: ffff888079210e58
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000030e11bff54b8 CR3: 000000007e4b5000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (30457):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/04/16 11:04 linux-6.1.y 8e8fc038cad5 df15c5f3 .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
2025/09/13 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
2026/06/04 12:52 linux-6.1.y 228da13e907e 197909be .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
2026/05/05 18:44 linux-6.1.y 4931e0e1673d 06e69a27 .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
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
2026/08/29 01:49 linux-6.1.y d64a499eea6b 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/28 23:44 linux-6.1.y d64a499eea6b 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/28 22:05 linux-6.1.y d64a499eea6b 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/28 21:54 linux-6.1.y d64a499eea6b 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/28 11:01 linux-6.1.y d64a499eea6b e2fa417d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/28 09:23 linux-6.1.y d64a499eea6b e2fa417d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/28 09:00 linux-6.1.y d64a499eea6b e2fa417d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/27 17:06 linux-6.1.y 79a9660d699e 69a01293 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/27 17:04 linux-6.1.y 79a9660d699e 69a01293 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/27 14:54 linux-6.1.y 79a9660d699e 69a01293 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/27 13:06 linux-6.1.y 05208478041c 69a01293 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/27 13:01 linux-6.1.y 05208478041c 69a01293 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/27 11:27 linux-6.1.y 05208478041c 69a01293 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/27 11:26 linux-6.1.y 05208478041c 69a01293 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/26 15:46 linux-6.1.y 05208478041c a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/26 14:18 linux-6.1.y 05208478041c a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/26 14:13 linux-6.1.y 05208478041c a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/26 04:03 linux-6.1.y 05208478041c 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/26 02:24 linux-6.1.y 05208478041c 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/26 01:29 linux-6.1.y 05208478041c 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/25 15:18 linux-6.1.y 05208478041c a9a1fc32 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/25 14:30 linux-6.1.y 05208478041c a9a1fc32 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/25 12:48 linux-6.1.y 05208478041c a9a1fc32 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/25 01:33 linux-6.1.y 05208478041c 614e416a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/25 01:33 linux-6.1.y 05208478041c 614e416a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/25 00:00 linux-6.1.y 05208478041c 614e416a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/24 16:51 linux-6.1.y 05208478041c b55bd4c3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/24 14:18 linux-6.1.y 05208478041c b55bd4c3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/24 11:40 linux-6.1.y 05208478041c b55bd4c3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/23 17:26 linux-6.1.y 05208478041c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/23 16:12 linux-6.1.y 05208478041c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/23 15:09 linux-6.1.y 05208478041c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/23 15:00 linux-6.1.y 05208478041c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in hfs_write_inode
2026/08/30 16:49 linux-6.1.y d64a499eea6b 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/08/30 09:27 linux-6.1.y d64a499eea6b 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/08/29 22:51 linux-6.1.y d64a499eea6b 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/08/27 20:58 linux-6.1.y 79a9660d699e 69a01293 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/08/27 15:58 linux-6.1.y 79a9660d699e 69a01293 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/08/27 03:12 linux-6.1.y 05208478041c a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/08/25 12:36 linux-6.1.y 05208478041c a9a1fc32 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/08/25 05:13 linux-6.1.y 05208478041c 614e416a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/08/24 13:47 linux-6.1.y 05208478041c b55bd4c3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/08/24 12:41 linux-6.1.y 05208478041c b55bd4c3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/08/24 05:10 linux-6.1.y 05208478041c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/08/24 03:05 linux-6.1.y 05208478041c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/08/23 23:35 linux-6.1.y 05208478041c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/08/23 19:24 linux-6.1.y 05208478041c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in hfs_write_inode
2026/08/23 10:46 linux-6.1.y 7e6e67054721 1e72964b .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.