[v6.1] WARNING in netdev_init_one_queue

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: e4f7d8be268e Linux 6.1.182
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=10d60879580000
kernel config: https://syzkaller.appspot.com/x/.config?x=872c04466179833f
dashboard link: https://syzkaller.appspot.com/bug?extid=c51dc10beff966eef176
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7cd9b1875376/disk-e4f7d8be.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4b5d35d18c31/vmlinux-e4f7d8be.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d5ee64c2af77/Image-e4f7d8be.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c51dc1...@syzkaller.appspotmail.com

------------[ cut here ]------------
netdev_lock_pos() could not find dev_type=796
WARNING: CPU: 1 PID: 10129 at net/core/dev.c:502 netdev_lock_pos net/core/dev.c:502 [inline]
WARNING: CPU: 1 PID: 10129 at net/core/dev.c:502 netdev_set_xmit_lockdep_class net/core/dev.c:511 [inline]
WARNING: CPU: 1 PID: 10129 at net/core/dev.c:502 netdev_init_one_queue+0x210/0x35c net/core/dev.c:10031
Modules linked in:
CPU: 1 PID: 10129 Comm: syz.1.1159 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 : ffff8000213870b0
x29: ffff8000213870b0 x28: ffff800013c170c0 x27: ffff800013c16e00
x26: dfff800000000000 x25: 000000000000fffe x24: ffff800013c17142
x23: 000000000000031c x22: ffff800013c17008 x21: ffff800017d5e000
x20: ffff0000f2ac0000 x19: ffff0000d4939c00 x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000082dd248 x15: 0000000000000000
x14: 0000000000000001 x13: 1ffff00004270d64 x12: 0000000000000000
x11: ff00800008195f70 x10: 0000000000000000 x9 : d972b2ce536a2400
x8 : d972b2ce536a2400 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff800021386b38 x4 : ffff800015464e80 x3 : ffff80000831d354
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000000
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+0x200/0x258 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: 1208
hardirqs last enabled at (1207): [<ffff80000831388c>] __up_console_sem+0xb4/0xfc kernel/printk/printk.c:261
hardirqs last disabled at (1208): [<ffff800011b8c2bc>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last enabled at (1202): [<ffff8000081ae3bc>] softirq_handle_end kernel/softirq.c:439 [inline]
softirqs last enabled at (1202): [<ffff8000081ae3bc>] handle_softirqs+0xb1c/0xc90 kernel/softirq.c:624
softirqs last disabled at (1175): [<ffff800008020e6c>] __do_softirq+0x14/0x20 kernel/softirq.c:630
---[ end trace 0000000000000000 ]---


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: e4f7d8be268e Linux 6.1.182
git tree: linux-6.1.y

console output: https://syzkaller.appspot.com/x/log.txt?x=10f26149580000

kernel config: https://syzkaller.appspot.com/x/.config?x=872c04466179833f
dashboard link: https://syzkaller.appspot.com/bug?extid=c51dc10beff966eef176
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
userspace arch: arm64

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=115c9879580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17e0a879580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7cd9b1875376/disk-e4f7d8be.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4b5d35d18c31/vmlinux-e4f7d8be.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d5ee64c2af77/Image-e4f7d8be.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c51dc1...@syzkaller.appspotmail.com

------------[ cut here ]------------
netdev_lock_pos() could not find dev_type=796

WARNING: CPU: 0 PID: 4524 at net/core/dev.c:502 netdev_lock_pos net/core/dev.c:502 [inline]
WARNING: CPU: 0 PID: 4524 at net/core/dev.c:502 netdev_set_xmit_lockdep_class net/core/dev.c:511 [inline]
WARNING: CPU: 0 PID: 4524 at net/core/dev.c:502 netdev_init_one_queue+0x210/0x35c net/core/dev.c:10031
Modules linked in:
CPU: 0 PID: 4524 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 : ffff800020ef70b0
x29: ffff800020ef70b0 x28: ffff800013c170c0 x27: ffff800013c16e00

x26: dfff800000000000 x25: 000000000000fffe x24: ffff800013c17142
x23: 000000000000031c x22: ffff800013c17008 x21: ffff800017d5e000

x20: ffff0000d8f9c000 x19: ffff0000da107800 x18: 1fffe00033e7277e
x17: ffff80001537d000 x16: ffff8000082dd248 x15: ffff00019f393bfc
x14: 0000000000000001 x13: 1fffe0001b71ae50 x12: 0000000000000000
x11: 0000000000000000 x10: ffff60001b71ae51 x9 : ec72062e9f002900
x8 : ec72062e9f002900 x7 : ffff80000825ab50 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : ffff80000824981c
x2 : 0000000000000001 x1 : 0000000000000004 x0 : 0000000000000001

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: 2208
hardirqs last enabled at (2207): [<ffff80000825abe4>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1374 [inline]
hardirqs last enabled at (2207): [<ffff80000825abe4>] finish_lock_switch+0xb0/0x1c8 kernel/sched/core.c:5005
hardirqs last disabled at (2208): [<ffff800011b8c2bc>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last enabled at (2190): [<ffff8000081ae3bc>] softirq_handle_end kernel/softirq.c:439 [inline]
softirqs last enabled at (2190): [<ffff8000081ae3bc>] handle_softirqs+0xb1c/0xc90 kernel/softirq.c:624
softirqs last disabled at (2161): [<ffff800008020e6c>] __do_softirq+0x14/0x20 kernel/softirq.c:630

---[ end trace 0000000000000000 ]---


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