------------[ cut here ]------------
Have pending ack frames!
WARNING: CPU: 1 PID: 214 at net/mac80211/main.c:1715 ieee80211_free_ack_frame+0x5a/0x60 net/mac80211/main.c:1715
Modules linked in:
CPU: 1 UID: 0 PID: 214 Comm: kworker/u32:5 Not tainted 6.16.0-rc3-syzkaller-00042-g78f4e737a53e #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: netns cleanup_net
RIP: 0010:ieee80211_free_ack_frame+0x5a/0x60 net/mac80211/main.c:1715
Code: 31 ff e8 09 e5 66 fe 31 c0 5b 5d c3 cc cc cc cc e8 eb 33 cf f6 c6 05 ae 9a a3 05 01 90 48 c7 c7 60 26 06 8d e8 e7 f6 8d f6 90 <0f> 0b 90 90 eb c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000323f8d0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff888053c0fcc0 RCX: ffffffff817ae248
RDX: ffff888024adc880 RSI: ffffffff817ae255 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: ffffffff8aece970 R14: 0000000080000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880d6853000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555701fb808 CR3: 000000003b374000 CR4: 0000000000352ef0
DR0: ffffffffffffffff DR1: 0000000000000047 DR2: 0000000000000005
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 idr_for_each+0x143/0x270 lib/idr.c:208
 ieee80211_free_hw+0x9c/0x2d0 net/mac80211/main.c:1732
 mac80211_hwsim_del_radio drivers/net/wireless/virtual/mac80211_hwsim.c:5674 [inline]
 hwsim_exit_net+0x3fd/0x7d0 drivers/net/wireless/virtual/mac80211_hwsim.c:6551
 ops_exit_list net/core/net_namespace.c:200 [inline]
 ops_undo_list+0x2ee/0xab0 net/core/net_namespace.c:253
 cleanup_net+0x408/0x890 net/core/net_namespace.c:686
 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3321 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
 kthread+0x3c2/0x780 kernel/kthread.c:464
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>