WARNING in netdev_queue_update_kobjects (3)

Status: upstream: reported on 2026/09/19 09:17
Reported-by: syzbot+dcf34c9131735f9cad4d@syzkaller.appspotmail.com
First crash: 13h13m, last: 13h13m
▶ ▼ 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 884d 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
linux-6.6 WARNING in netdev_queue_update_kobjects -1 20 1d09h 4d21h 0/2 upstream: reported on 2026/09/15 01:16
upstream WARNING in netdev_queue_update_kobjects (2) fs -1 syz, C error error 18 880d 880d 0/29 auto-obsoleted due to no activity on 2024/07/01 12:34
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 644d 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 644d 687d 3/3 fixed on 2025/01/25 04:10
linux-6.1 WARNING in netdev_queue_update_kobjects (3) -1 syz 4 3d01h 4d04h 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: 1325 at fs/sysfs/group.c:281 sysfs_remove_group+0x177/0x290 fs/sysfs/group.c:279
Modules linked in:
CPU: 0 PID: 1325 Comm: kworker/0:3 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+0x177/0x290 fs/sysfs/group.c:279
Code: 8b 1b 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 2b 2a d0 ff 49 8b 17 48 c7 c7 c0 b2 39 8a 48 89 de e8 89 2b c8 07 <0f> 0b 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 43 f6 8a ff
RSP: 0018:ffffc900051978f8 EFLAGS: 00010246
RAX: 30291ff335a4fb00 RBX: ffffffff8b20c360 RCX: ffff888023119dc0
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000073 R08: ffff8880b9033d7f R09: 1ffff110172067af
R10: dffffc0000000000 R11: ffffed10172067b0 R12: 1ffffffff1641788
R13: dffffc0000000000 R14: ffff88802a381740 R15: ffff8880245d3018
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055732c349950 CR3: 0000000046312000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 netdev_queue_update_kobjects+0x37a/0x3e0 net/core/net-sysfs.c:1724
 remove_queue_kobjects net/core/net-sysfs.c:1823 [inline]
 netdev_unregister_kobject+0x104/0x250 net/core/net-sysfs.c:1976
 unregister_netdevice_many+0x1530/0x1a40 net/core/dev.c:11187
 unregister_netdevice_queue+0x2e1/0x320 net/core/dev.c:11093
 unregister_netdevice include/linux/netdevice.h:3047 [inline]
 lowpan_unregister_netdevice net/6lowpan/core.c:65 [inline]
 lowpan_unregister_netdev+0x18/0x20 net/6lowpan/core.c:73
 process_one_work+0x867/0xff0 kernel/workqueue.c:2310
 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/19 09:16 linux-5.15.y 0248c33e835e 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in netdev_queue_update_kobjects
* Struck through repros no longer work on HEAD.