[v6.1] WARNING in ieee80211_link_release_channel

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 3594f306da12 Linux 6.1.147
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=16ecd834580000
kernel config: https://syzkaller.appspot.com/x/.config?x=30b8ca4950f83e04
dashboard link: https://syzkaller.appspot.com/bug?extid=15b80e0eb09fd5403e49
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5b0395e2ec6c/disk-3594f306.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c3ec331b7d5b/vmlinux-3594f306.xz
kernel image: https://storage.googleapis.com/syzbot-assets/bff42068e062/bzImage-3594f306.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+15b80e...@syzkaller.appspotmail.com

bond0: (slave wlan1): Releasing backup interface
------------[ cut here ]------------
WARNING: CPU: 1 PID: 51 at net/mac80211/chan.c:2016 ieee80211_link_release_channel+0x150/0x180 net/mac80211/chan.c:2016
Modules linked in:
CPU: 1 PID: 51 Comm: kworker/u4:3 Not tainted 6.1.147-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: netns cleanup_net
RIP: 0010:ieee80211_link_release_channel+0x150/0x180 net/mac80211/chan.c:2016
Code: 7c 2d 00 00 74 08 48 89 df e8 ac b8 30 f8 bf 18 1e 00 00 48 03 3b 5b 41 5c 41 5d 41 5e 41 5f 5d e9 45 e6 7e 00 e8 10 9c e0 f7 <0f> 0b eb c5 48 c7 c1 64 80 1f 8e 80 e1 07 80 c1 03 38 c1 0f 8c 51
RSP: 0018:ffffc90000bc76e8 EFLAGS: 00010293
RAX: ffffffff89a02ad0 RBX: ffff88802a5d95a8 RCX: ffff88801cac0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff1c3e976
R10: fffffbfff1c3e976 R11: 1ffffffff1c3e975 R12: ffff88802a5daae0
R13: 1ffff110054bb2b5 R14: ffff88802a5da258 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000011000 CR3: 0000000058783000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
unregister_netdevice_many+0x12ab/0x1840 net/core/dev.c:10995
ieee80211_remove_interfaces+0x429/0x6d0 net/mac80211/iface.c:2382
ieee80211_unregister_hw+0x59/0x290 net/mac80211/main.c:1478
mac80211_hwsim_del_radio+0x270/0x450 drivers/net/wireless/mac80211_hwsim.c:4688
hwsim_exit_net+0x581/0x640 drivers/net/wireless/mac80211_hwsim.c:5475
ops_exit_list net/core/net_namespace.c:172 [inline]
cleanup_net+0x6f0/0xb80 net/core/net_namespace.c:640
process_one_work+0x898/0x1160 kernel/workqueue.c:2292
worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>


---
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[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 3a8ababb8b6a Linux 6.6.101
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=158842f0580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a2bd95b6de4839b7
dashboard link: https://syzkaller.appspot.com/bug?extid=47350a473be99ab8cff7

compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7

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

Downloadable assets:

disk image: https://storage.googleapis.com/syzbot-assets/f06c672f5fa8/disk-3a8ababb.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9af9b7afcdc5/vmlinux-3a8ababb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/351a55aafa77/bzImage-3a8ababb.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:

Reported-by: syzbot+47350a...@syzkaller.appspotmail.com

bond0: (slave wlan1): Releasing backup interface
------------[ cut here ]------------

WARNING: CPU: 1 PID: 20090 at net/mac80211/chan.c:2021 ieee80211_link_release_channel+0x154/0x180 net/mac80211/chan.c:2021
Modules linked in:
CPU: 1 PID: 20090 Comm: syz.3.4263 Not tainted 6.6.101-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025

RIP: 0010:ieee80211_link_release_channel+0x154/0x180 net/mac80211/chan.c:2021
Code: 7c 2d 00 00 74 08 48 89 df e8 a8 bf ea f7 bf 60 1e 00 00 48 03 3b 5b 41 5c 41 5d 41 5e 41 5f 5d e9 d1 91 83 00 e8 8c 79 93 f7 <0f> 0b eb c5 48 c7 c1 9c b9 4a 8e 80 e1 07 80 c1 03 38 c1 0f 8c 51
RSP: 0018:ffffc9000c5270e8 EFLAGS: 00010246
RAX: ffffffff89f21c04 RBX: ffff888031f81598 RCX: 0000000000080000
RDX: ffffc9000b969000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 0000000000000000 R08: ffffffff8e4a84ef R09: 1ffffffff1c9509d
R10: dffffc0000000000 R11: fffffbfff1c9509e R12: ffff888031f82c08
R13: 1ffff110063f02b3 R14: ffff888031f823c0 R15: dffffc0000000000
FS: 00007f735197f6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 000000110c24e84e CR3: 0000000025e40000 CR4: 00000000003506e0
Call Trace:
<TASK>
unregister_netdevice_many_notify+0x1257/0x1810 net/core/dev.c:11094
unregister_netdevice_many net/core/dev.c:11130 [inline]
unregister_netdevice_queue+0x324/0x360 net/core/dev.c:11010
unregister_netdevice include/linux/netdevice.h:3137 [inline]
_cfg80211_unregister_wdev+0x16b/0x580 net/wireless/core.c:1215
ieee80211_if_remove+0x1c1/0x2c0 net/mac80211/iface.c:2288
ieee80211_del_iface+0x19/0x20 net/mac80211/cfg.c:202
rdev_del_virtual_intf net/wireless/rdev-ops.h:62 [inline]
cfg80211_remove_virtual_intf+0x224/0x3c0 net/wireless/util.c:2754
genl_family_rcv_msg_doit+0x209/0x2f0 net/netlink/genetlink.c:971
genl_family_rcv_msg net/netlink/genetlink.c:1051 [inline]
genl_rcv_msg+0x60b/0x790 net/netlink/genetlink.c:1066
netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2555
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1075
netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]
netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1356
netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1904
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
___sys_sendmsg+0x220/0x290 net/socket.c:2649
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2687 [inline]
__se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7350b8eb69
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f735197f038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f7350db5fa0 RCX: 00007f7350b8eb69
RDX: 0000000020008000 RSI: 0000200000000380 RDI: 0000000000000007
RBP: 00007f7350c11df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f7350db5fa0 R15: 00007fff616d96a8