netdev - WARNING in dev_addr

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Message-ID: <CALAgD-5Y84pL8sUJe5_Sp9sJ_M1Xw-pqzLmauWHRTfE_TFoVVg@mail.gmail.com>
Date: Sat, 24 Aug 2024 22:18:20 -0700
From: Xingyu Li <xli399@....edu>
To: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, 
	pabeni@...hat.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: WARNING in dev_addr_check

Hi,

We found a bug in Linux 6.10. It is probably a logic bug.
There is a warning "Incorrect netdev->dev_addr"  generated at the line
519 of warning net/core/dev_addr_lists.c.

The bug report is as follows, but unfortunately there is no generated
syzkaller reproducer.

Bug report:

netdevice: wlan1 (unregistered): Incorrect netdev->dev_addr
WARNING: CPU: 0 PID: 70 at net/core/dev_addr_lists.c:519
dev_addr_check+0x17e/0x1e0 net/core/dev_addr_lists.c:519
Modules linked in:
CPU: 0 PID: 70 Comm: kworker/u4:4 Not tainted 6.10.0 #13
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
Workqueue: netns cleanup_net
RIP: 0010:dev_addr_check+0x17e/0x1e0 net/core/dev_addr_lists.c:519
Code: f9 48 8b 13 eb 15 80 3d 89 fb 35 06 01 75 22 e8 28 1b b8 f8 48
c7 c2 e0 f7 68 8c 48 c7 c7 e0 f4 68 8c 4c 89 fe e8 c2 69 7c f8 <0f> 0b
e9 e6 fe ff ff e8 06 1b b8 f8 c6 05 59 fb 35 06 01 48 c7 c7
RSP: 0018:ffffc9000185f710 EFLAGS: 00010246
RAX: 503403a848a81f00 RBX: ffffffff8c68f818 RCX: ffff888018159e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000fffffff8 R08: ffffffff8155a25a R09: 1ffff1100c74519a
R10: dffffc0000000000 R11: ffffed100c74519b R12: ffff888046f046c0
R13: dffffc0000000000 R14: ffff888046f04130 R15: ffff888046f04130
FS:  0000000000000000(0000) GS:ffff888063a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f9af880ae8 CR3: 000000003c37c000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dev_addr_flush+0x28/0x200 net/core/dev_addr_lists.c:533
 free_netdev+0x1f4/0x4d0 net/core/dev.c:11074
 netdev_run_todo+0xdfa/0xf80 net/core/dev.c:10695
 ieee80211_unregister_hw+0x11f/0x2d0 net/mac80211/main.c:1669
 mac80211_hwsim_del_radio+0x2ba/0x4b0
drivers/net/wireless/virtual/mac80211_hwsim.c:5576
 hwsim_exit_net+0x5bd/0x660 drivers/net/wireless/virtual/mac80211_hwsim.c:6453
 ops_exit_list net/core/net_namespace.c:173 [inline]
 cleanup_net+0x810/0xcd0 net/core/net_namespace.c:640
 process_one_work kernel/workqueue.c:3248 [inline]
 process_scheduled_works+0x977/0x1410 kernel/workqueue.c:3329
 worker_thread+0xaa0/0x1020 kernel/workqueue.c:3409
 kthread+0x2eb/0x380 kernel/kthread.c:389
 ret_from_fork+0x49/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:244
 </TASK>


-- 
Yours sincerely,
Xingyu