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: 28d, last: 4h41m
▶ ▼ 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 898d 912d 0/3 auto-obsoleted due to no activity on 2024/08/10 09:34
upstream WARNING in netdev_queue_update_kobjects fs -1 6 1776d 1807d 0/29 auto-closed as invalid on 2022/03/06 23:23
linux-6.6 WARNING in netdev_queue_update_kobjects -1 99 5h28m 33d 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 908d 908d 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 899d 912d 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 672d 715d 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 672d 715d 3/3 fixed on 2025/01/25 04:10
linux-6.1 WARNING in netdev_queue_update_kobjects (3) -1 syz 70 9h36m 32d 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: 4310 at fs/sysfs/group.c:281 sysfs_remove_group+0x177/0x290 fs/sysfs/group.c:279
Modules linked in:
CPU: 0 PID: 4310 Comm: kworker/0:7 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 4b 26 d0 ff 49 8b 17 48 c7 c7 80 b3 39 8a 48 89 de e8 a9 e7 c8 07 <0f> 0b 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 23 e1 8a ff
RSP: 0018:ffffc900031ff8f8 EFLAGS: 00010246
RAX: 3af58aaa2beaf300 RBX: ffffffff8b20ce20 RCX: ffff888021488000
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000076 R08: ffff8880b8e33d7f R09: 1ffff110171c67af
R10: dffffc0000000000 R11: ffffed10171c67b0 R12: 1ffffffff16418e0
R13: dffffc0000000000 R14: ffff888057cca658 R15: ffff8880224e1818
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc16c153ff8 CR3: 000000002a9b7000 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:11188
 unregister_netdevice_queue+0x2e1/0x320 net/core/dev.c:11094
 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 (10):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/17 22:32 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in netdev_queue_update_kobjects
2026/10/16 14:49 linux-5.15.y 792fbe1537d8 4c840a2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in netdev_queue_update_kobjects
2026/10/01 18:28 linux-5.15.y 0248c33e835e f5cdae2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in netdev_queue_update_kobjects
2026/10/01 18:14 linux-5.15.y 0248c33e835e f5cdae2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in netdev_queue_update_kobjects
2026/09/26 07:51 linux-5.15.y 0248c33e835e a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in netdev_queue_update_kobjects
2026/09/26 06:47 linux-5.15.y 0248c33e835e a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in netdev_queue_update_kobjects
2026/09/26 06:21 linux-5.15.y 0248c33e835e a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in netdev_queue_update_kobjects
2026/09/23 04:56 linux-5.15.y 0248c33e835e 5207b90e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in netdev_queue_update_kobjects
2026/09/21 09:14 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
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.