[syzbot] [net?] WARNING in netdev_nl_dev_fill

From: syzbot
Date: Sun Apr 13 2025 - 22:14:46 EST

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Hello,

syzbot found the following issue on:

HEAD commit: 311920774c40 configs/debug: run and debug PREEMPT
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=15fe37e4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f2054704dd53fb80
dashboard link: https://syzkaller.appspot.com/bug?extid=ab6046c8981706660600
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1594f74c580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13c5723f980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5e03f27bfdf3/disk-31192077.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a331144c511b/vmlinux-31192077.xz
kernel image: https://storage.googleapis.com/syzbot-assets/50e193bbfbdd/bzImage-31192077.xz

The issue was bisected to:

commit 99e44f39a8f7138f8b9d2bd87b17fceb483f8998
Author: Jakub Kicinski <kuba@xxxxxxxxxx>
Date: Tue Apr 8 19:59:53 2025 +0000

netdev: depend on netdev->lock for xdp features

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1519f23f980000
final oops: https://syzkaller.appspot.com/x/report.txt?x=1719f23f980000
console output: https://syzkaller.appspot.com/x/log.txt?x=1319f23f980000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ab6046c8981706660600@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 99e44f39a8f7 ("netdev: depend on netdev->lock for xdp features")

------------[ cut here ]------------
WARNING: CPU: 0 PID: 5842 at ./include/net/netdev_lock.h:17 netdev_assert_locked include/net/netdev_lock.h:17 [inline]
WARNING: CPU: 0 PID: 5842 at ./include/net/netdev_lock.h:17 netdev_nl_dev_fill+0x6bc/0x860 net/core/netdev-genl.c:41
Modules linked in:
CPU: 0 UID: 0 PID: 5842 Comm: syz-executor216 Not tainted 6.14.0-syzkaller-13332-g311920774c40 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:netdev_assert_locked include/net/netdev_lock.h:17 [inline]
RIP: 0010:netdev_nl_dev_fill+0x6bc/0x860 net/core/netdev-genl.c:41
Code: 1c 24 44 29 eb 4c 89 e8 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 4a 01 00 00 41 89 5d 00 31 c0 e9 4d fe ff ff e8 e5 ed c4 f7 90 <0f> 0b 90 e9 2c fa ff ff e8 d7 ed c4 f7 90 0f 0b 90 42 80 3c 3b 00
RSP: 0018:ffffc90004166a20 EFLAGS: 00010293
RAX: ffffffff89fe695b RBX: 0000000000000000 RCX: ffff8880303b5a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90004166b50 R08: ffffffff89fe637c R09: 1ffff11009e4f5dc
R10: dffffc0000000000 R11: ffffed1009e4f5dd R12: ffff88803259c000
R13: ffff888034e433c0 R14: ffff888034e433c0 R15: ffffc90004166ba0
FS: 000055557df6b480(0000) GS:ffff888124f96000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f95074a6b30 CR3: 000000007d20e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
netdev_genl_dev_notify+0x1fb/0x450 net/core/netdev-genl.c:102
netdev_genl_netdevice_event+0x81/0xa0 net/core/netdev-genl.c:-1
notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2273 [inline]
call_netdevice_notifiers net/core/dev.c:2287 [inline]
register_netdevice+0x16c0/0x1b80 net/core/dev.c:11109
cfg80211_register_netdevice+0x149/0x2f0 net/wireless/core.c:1490
ieee80211_if_add+0x119b/0x1780 net/mac80211/iface.c:2225
ieee80211_register_hw+0x3718/0x42d0 net/mac80211/main.c:1604
mac80211_hwsim_new_radio+0x2adc/0x4a60 drivers/net/wireless/virtual/mac80211_hwsim.c:5559
hwsim_new_radio_nl+0xed0/0x2290 drivers/net/wireless/virtual/mac80211_hwsim.c:6243
genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline]
genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
genl_rcv_msg+0xb38/0xf00 net/netlink/genetlink.c:1210
netlink_rcv_skb+0x208/0x480 net/netlink/af_netlink.c:2534
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x7f8/0x9a0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8c3/0xcd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:727
__sys_sendto+0x365/0x4c0 net/socket.c:2180
__do_sys_sendto net/socket.c:2187 [inline]
__se_sys_sendto net/socket.c:2183 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2183
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f95074f6dac
Code: ba 56 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 00 57 02 00 48 8b
RSP: 002b:00007ffe66048c60 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f950757f300 RCX: 00007f95074f6dac
RDX: 0000000000000024 RSI: 00007f950757f350 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffe66048cb4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f950757f350 R15: 0000000000000000
</TASK>

---
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection

If the report is already addressed, let syzbot know by replying with:
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Next message: syzbot: "[syzbot] [net?] general protection fault in rtnl_create_link"
Previous message: Waiman Long: "[PATCH v6 2/2] selftests: memcg: Increase error tolerance of child memory.current check in test_memcg_protection()"
Next in thread: Jakub Kicinski: "Re: [syzbot] [net?] WARNING in netdev_nl_dev_fill"
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