------------[ cut here ]------------
Have pending ack frames!
WARNING: CPU: 0 PID: 49 at net/mac80211/main.c:1715 ieee80211_free_ack_frame+0x4d/0x60 net/mac80211/main.c:1715
Modules linked in:
CPU: 0 UID: 0 PID: 49 Comm: kworker/u8:3 Not tainted 6.16.0-rc5-syzkaller-00121-gbc9ff192a6c9 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
RIP: 0010:ieee80211_free_ack_frame+0x4d/0x60 net/mac80211/main.c:1715
Code: 00 00 e8 06 5f 71 fe 31 c0 5b e9 fe a3 94 00 cc e8 c8 c7 e2 f6 c6 05 aa 80 ae 04 01 90 48 c7 c7 e0 e0 ae 8c e8 84 a7 a6 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:ffffc90000b97610 EFLAGS: 00010246
RAX: 213c3ff98fda7d00 RBX: ffff8880313ac280 RCX: ffff888022280000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc90000b97718 R08: ffff8880b8624293 R09: 1ffff110170c4852
R10: dffffc0000000000 R11: ffffed10170c4853 R12: ffffc90000b97680
R13: ffff888025fcd630 R14: ffff88803165afa8 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888125c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeefcd5ff8 CR3: 0000000077fb8000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 idr_for_each+0x1b5/0x290 lib/idr.c:208
 ieee80211_free_hw+0xc6/0x480 net/mac80211/main.c:1732
 mac80211_hwsim_del_radio+0x2de/0x460 drivers/net/wireless/virtual/mac80211_hwsim.c:5674
 hwsim_exit_net+0x584/0x640 drivers/net/wireless/virtual/mac80211_hwsim.c:6551
 ops_exit_list net/core/net_namespace.c:200 [inline]
 ops_undo_list+0x49a/0x990 net/core/net_namespace.c:253
 cleanup_net+0x4c5/0x800 net/core/net_namespace.c:686
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>