WARNING in netdev_queue_update_kobjects

Status: upstream: reported on 2026/09/15 01:16
Reported-by: syzbot+96c9c1ba229d67f0269e@syzkaller.appspotmail.com
First crash: 4d12h, last: 1d00h
▶ ▼ Similar bugs (8)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in netdev_queue_update_kobjects -1 7 870d 883d 0/3 auto-obsoleted due to no activity on 2024/08/10 09:34
upstream WARNING in netdev_queue_update_kobjects fs -1 6 1747d 1779d 0/29 auto-closed as invalid on 2022/03/06 23:23
upstream WARNING in netdev_queue_update_kobjects (2) fs -1 syz, C error error 18 880d 879d 0/29 auto-obsoleted due to no activity on 2024/07/01 12:34
linux-5.15 WARNING in netdev_queue_update_kobjects (3) -1 1 4h14m 4h13m 0/3 upstream: reported on 2026/09/19 09:17
linux-6.1 WARNING in netdev_queue_update_kobjects -1 16 871d 883d 0/3 auto-obsoleted due to no activity on 2024/07/10 12:34
linux-5.15 WARNING in netdev_queue_update_kobjects (2) origin:upstream -1 syz, C done 303 643d 687d 3/3 fixed on 2025/01/25 04:10
linux-6.1 WARNING in netdev_queue_update_kobjects (2) origin:lts-only -1 syz, C done 344 643d 687d 3/3 fixed on 2025/01/25 04:10
linux-6.1 WARNING in netdev_queue_update_kobjects (3) -1 syz 4 2d16h 3d19h 0/3 upstream: reported syz repro on 2026/09/15 17:57

Sample crash report:
------------[ cut here ]------------
sysfs group 'byte_queue_limits' not found for kobject 'tx-0'
WARNING: CPU: 0 PID: 9 at fs/sysfs/group.c:284 sysfs_remove_group+0x17b/0x290 fs/sysfs/group.c:282
Modules linked in:
CPU: 0 PID: 9 Comm: kworker/0:1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events delete_netdev
RIP: 0010:sysfs_remove_group+0x17b/0x290 fs/sysfs/group.c:282
Code: 8b 1b 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 97 21 c9 ff 49 8b 17 48 c7 c7 00 c0 da 8a 48 89 de e8 65 59 3a ff <0f> 0b 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 4f 95 70 ff
RSP: 0018:ffffc900000e7840 EFLAGS: 00010246
RAX: 253b7b2a18293400 RBX: ffffffff8bc599a0 RCX: ffff88801b278000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 00000000000000a5 R08: ffffc900000e7447 R09: 1ffff9200001ce88
R10: dffffc0000000000 R11: fffff5200001ce89 R12: 1ffffffff178b230
R13: dffffc0000000000 R14: ffff88805f1b54d8 R15: ffff88805f5f0820
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffca193b038 CR3: 00000000621d7000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 000000000000000b DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 netdev_queue_update_kobjects+0x3e1/0x480 net/core/net-sysfs.c:1758
 remove_queue_kobjects net/core/net-sysfs.c:1857 [inline]
 netdev_unregister_kobject+0x108/0x250 net/core/net-sysfs.c:2010
 unregister_netdevice_many_notify+0x1449/0x1910 net/core/dev.c:11192
 unregister_netdevice_many net/core/dev.c:11218 [inline]
 unregister_netdevice_queue+0x2e9/0x330 net/core/dev.c:11098
 unregister_netdevice include/linux/netdevice.h:3191 [inline]
 lowpan_unregister_netdevice net/6lowpan/core.c:66 [inline]
 lowpan_unregister_netdev+0x1c/0x30 net/6lowpan/core.c:74
 unregister_dev+0x70/0x1a0 net/bluetooth/6lowpan.c:763
 process_one_work kernel/workqueue.c:2657 [inline]
 process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815
 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 (20):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/18 12:52 linux-6.6.y 79643295eba1 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in netdev_queue_update_kobjects
2026/09/18 12:52 linux-6.6.y 79643295eba1 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in netdev_queue_update_kobjects
2026/09/18 12:51 linux-6.6.y 79643295eba1 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in netdev_queue_update_kobjects
2026/09/18 12:51 linux-6.6.y 79643295eba1 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in netdev_queue_update_kobjects
2026/09/18 11:27 linux-6.6.y 79643295eba1 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in netdev_queue_update_kobjects
2026/09/18 11:23 linux-6.6.y 79643295eba1 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in netdev_queue_update_kobjects
2026/09/18 03:20 linux-6.6.y 79643295eba1 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in netdev_queue_update_kobjects
2026/09/18 03:20 linux-6.6.y 79643295eba1 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in netdev_queue_update_kobjects
2026/09/18 03:19 linux-6.6.y 79643295eba1 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in netdev_queue_update_kobjects
2026/09/17 20:56 linux-6.6.y 79643295eba1 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in netdev_queue_update_kobjects
2026/09/17 20:53 linux-6.6.y 79643295eba1 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in netdev_queue_update_kobjects
2026/09/17 02:44 linux-6.6.y 79643295eba1 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in netdev_queue_update_kobjects
2026/09/17 02:42 linux-6.6.y 79643295eba1 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in netdev_queue_update_kobjects
2026/09/17 02:41 linux-6.6.y 79643295eba1 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in netdev_queue_update_kobjects
2026/09/17 02:39 linux-6.6.y 79643295eba1 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in netdev_queue_update_kobjects
2026/09/16 10:36 linux-6.6.y 79643295eba1 12a0a44a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in netdev_queue_update_kobjects
2026/09/16 10:35 linux-6.6.y 79643295eba1 12a0a44a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in netdev_queue_update_kobjects
2026/09/16 10:32 linux-6.6.y 79643295eba1 12a0a44a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in netdev_queue_update_kobjects
2026/09/16 08:28 linux-6.6.y 79643295eba1 12a0a44a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in netdev_queue_update_kobjects
2026/09/15 01:15 linux-6.6.y 79643295eba1 81a27d1a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in netdev_queue_update_kobjects
* Struck through repros no longer work on HEAD.