------------[ cut here ]------------
Have pending ack frames!
WARNING: CPU: 1 PID: 3509 at net/mac80211/main.c:1713 ieee80211_free_ack_frame+0x4d/0x60 net/mac80211/main.c:1713
Modules linked in:
CPU: 1 UID: 0 PID: 3509 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: netns cleanup_net
RIP: 0010:ieee80211_free_ack_frame+0x4d/0x60 net/mac80211/main.c:1713
Code: 00 00 e8 a6 b0 6c fe 31 c0 5b e9 3e 43 95 00 cc e8 98 b2 06 f7 c6 05 07 53 cf 04 01 90 48 c7 c7 a0 6c 8a 8c e8 94 cf c9 f6 90 <0f> 0b 90 90 eb c8 cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90
RSP: 0018:ffffc9000c78f590 EFLAGS: 00010246
RAX: 4cc6e95c6404b500 RBX: ffff8880522fea00 RCX: ffff8880307c0000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc9000c78f698 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfa658 R12: ffffc9000c78f600
R13: ffff88804e9739f0 R14: ffff88807dea2ff8 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888125e0f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0588160d58 CR3: 000000007f7e4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 idr_for_each+0x1b2/0x290 lib/idr.c:208
 ieee80211_free_hw+0x44/0x3d0 net/mac80211/main.c:1725
 mac80211_hwsim_del_radio+0x2de/0x460 drivers/net/wireless/virtual/mac80211_hwsim.c:5912
 hwsim_exit_net+0xef4/0xfb0 drivers/net/wireless/virtual/mac80211_hwsim.c:6799
 ops_exit_list net/core/net_namespace.c:199 [inline]
 ops_undo_list+0x49a/0x990 net/core/net_namespace.c:252
 cleanup_net+0x4d8/0x820 net/core/net_namespace.c:695
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>