WARNING in netdev_init_one_queue

Status: upstream: reported C repro on 2026/08/11 07:27
Reported-by: syzbot+c51dc10beff966eef176@syzkaller.appspotmail.com
First crash: 2d16h, last: 2d14h
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in netdev_init_one_queue net -1 syz, C error error 2 170d 184d 0/29 closed as invalid on 2026/04/08 13:13

Sample crash report:
------------[ cut here ]------------
netdev_lock_pos() could not find dev_type=796
WARNING: CPU: 0 PID: 4537 at net/core/dev.c:502 netdev_lock_pos net/core/dev.c:502 [inline]
WARNING: CPU: 0 PID: 4537 at net/core/dev.c:502 netdev_set_xmit_lockdep_class net/core/dev.c:511 [inline]
WARNING: CPU: 0 PID: 4537 at net/core/dev.c:502 netdev_init_one_queue+0x210/0x35c net/core/dev.c:10031
Modules linked in:
CPU: 0 PID: 4537 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : netdev_lock_pos net/core/dev.c:502 [inline]
pc : netdev_set_xmit_lockdep_class net/core/dev.c:511 [inline]
pc : netdev_init_one_queue+0x210/0x35c net/core/dev.c:10031
lr : netdev_lock_pos net/core/dev.c:502 [inline]
lr : netdev_set_xmit_lockdep_class net/core/dev.c:511 [inline]
lr : netdev_init_one_queue+0x210/0x35c net/core/dev.c:10031
sp : ffff8000210f70b0
x29: ffff8000210f70b0 x28: ffff800013c170c0 x27: ffff800013c16e00
x26: dfff800000000000 x25: 000000000000fffe x24: ffff800013c17142
x23: 000000000000031c x22: ffff800013c17008 x21: ffff800017d5e000
x20: ffff0000cb7f4000 x19: ffff0000cefa8000 x18: 1fffe00033e7277e
x17: ffff80001537d000 x16: ffff8000082dd248 x15: 0000000040000000
x14: 0000000000000001 x13: 1fffe00033e74e70 x12: 0000000000000000
x11: ff0080000a975d20 x10: 0000000000000003 x9 : 2422cbdf36e4c400
x8 : 2422cbdf36e4c400 x7 : ffff80000825ab50 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000006 x1 : ffff800011cedc80 x0 : ffff80018a0bd000
Call trace:
 netdev_lock_pos net/core/dev.c:502 [inline]
 netdev_set_xmit_lockdep_class net/core/dev.c:511 [inline]
 netdev_init_one_queue+0x210/0x35c net/core/dev.c:10031
 dev_ingress_queue_create+0x124/0x194 net/core/dev.c:10702
 tc_modify_qdisc+0x308/0x1814 net/sched/sch_api.c:1607
 rtnetlink_rcv_msg+0x694/0xcc4 net/core/rtnetlink.c:6166
 netlink_rcv_skb+0x220/0x3ec net/netlink/af_netlink.c:2516
 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6184
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x5fc/0x80c net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x6f0/0x9d8 net/netlink/af_netlink.c:1877
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x588/0x90c net/socket.c:2519
 ___sys_sendmsg net/socket.c:2573 [inline]
 __sys_sendmsg+0x288/0x374 net/socket.c:2602
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg net/socket.c:2609 [inline]
 __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2609
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 2804
hardirqs last  enabled at (2803): [<ffff80000825abe4>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1374 [inline]
hardirqs last  enabled at (2803): [<ffff80000825abe4>] finish_lock_switch+0xb0/0x1c8 kernel/sched/core.c:5005
hardirqs last disabled at (2804): [<ffff800011b8c2bc>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (2776): [<ffff80000fefd8f4>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (2768): [<ffff80000fefd8c0>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/11 08:48 linux-6.1.y e4f7d8be268e 508909ea .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in netdev_init_one_queue
2026/08/11 08:07 linux-6.1.y e4f7d8be268e 508909ea .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in netdev_init_one_queue
2026/08/11 07:27 linux-6.1.y e4f7d8be268e 508909ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in netdev_init_one_queue
* Struck through repros no longer work on HEAD.