syzbot


WARNING in kernfs_new_node (2)

Status: upstream: reported on 2026/05/29 02:02
Reported-by: syzbot+a58c0d611f6dab088a7a@syzkaller.appspotmail.com
First crash: 3d17h, last: 3d17h
Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 WARNING in kernfs_new_node -1 1 342d 341d 0/2 auto-obsoleted due to no activity on 2025/10/02 19:14
upstream WARNING in kernfs_new_node kernfs -1 C done done 2 2267d 2492d 15/29 fixed on 2020/05/10 10:41
upstream WARNING in kernfs_new_node (2) kernfs -1 1 758d 754d 0/29 auto-obsoleted due to no activity on 2024/08/12 04:32
upstream WARNING in kernfs_new_node (3) kernfs prio:high -1 syz error error 49 16d 651d 0/29 upstream: reported syz repro on 2024/08/19 18:26

Sample crash report:
usb 2-1: Direct firmware load for ueagle-atm/eagleI.fw failed with error -2
usb 2-1: Falling back to sysfs fallback for: ueagle-atm/eagleI.fw
------------[ cut here ]------------
WARNING: CPU: 0 PID: 787 at fs/kernfs/dir.c:526 kernfs_get fs/kernfs/dir.c:526 [inline]
WARNING: CPU: 0 PID: 787 at fs/kernfs/dir.c:526 kernfs_new_node+0x1f9/0x260 fs/kernfs/dir.c:703
Modules linked in:
CPU: 0 PID: 787 Comm: kworker/0:2 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: events request_firmware_work_func
RIP: 0010:kernfs_get fs/kernfs/dir.c:526 [inline]
RIP: 0010:kernfs_new_node+0x1f9/0x260 fs/kernfs/dir.c:703
Code: ff df 80 3c 08 00 74 08 4c 89 ff e8 81 4b ca ff 49 89 1f 4c 89 f0 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 77 0b 72 ff <0f> 0b eb 9e 89 e9 80 e1 07 fe c1 38 c1 0f 8c 45 fe ff ff 48 89 ef
RSP: 0018:ffffc90003b17618 EFLAGS: 00010293
RAX: ffffffff82152079 RBX: ffff88806ba8c3e0 RCX: ffff88802133bc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88806ba8c3e3 R09: 1ffff1100d75187c
R10: dffffc0000000000 R11: ffffed100d75187d R12: 00000000000041ed
R13: 0000000000000000 R14: ffff888066576aa8 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3ecb57e08d CR3: 0000000019ad2000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 kernfs_create_dir_ns+0x44/0x120 fs/kernfs/dir.c:1061
 sysfs_create_dir_ns+0x130/0x2a0 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:73 [inline]
 kobject_add_internal+0x61c/0xcc0 lib/kobject.c:240
 kobject_add_varg lib/kobject.c:374 [inline]
 kobject_add+0x164/0x240 lib/kobject.c:426
 class_dir_create_and_add drivers/base/core.c:3226 [inline]
 get_device_parent+0x316/0x390 drivers/base/core.c:3277
 device_add+0x2e1/0xc50 drivers/base/core.c:3607
 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:82 [inline]
 fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:158 [inline]
 firmware_fallback_sysfs+0x2e9/0x930 drivers/base/firmware_loader/fallback.c:234
 _request_firmware+0xf27/0x1510 drivers/base/firmware_loader/main.c:936
 request_firmware_work_func+0xb0/0x1b0 drivers/base/firmware_loader/main.c:1189
 process_one_work kernel/workqueue.c:2653 [inline]
 process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
 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>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/29 02:01 linux-6.6.y 0a40c6fbd105 4624854e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in kernfs_new_node
* Struck through repros no longer work on HEAD.