IPVS: stopping backup sync thread 19368 ...
------------[ cut here ]------------
Have pending ack frames!
WARNING: CPU: 0 PID: 11 at net/mac80211/main.c:1507 ieee80211_free_ack_frame+0x51/0x60 net/mac80211/main.c:1507
Modules linked in:
CPU: 1 PID: 11 Comm: kworker/u4:1 Not tainted 6.1.0-syzkaller-11778-gc183e6c3ec34 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: netns cleanup_net
RIP: 0010:ieee80211_free_ack_frame+0x51/0x60 net/mac80211/main.c:1507
Code: 48 89 ef be 02 00 00 00 e8 0c a4 84 fe 31 c0 5b 5d c3 e8 32 13 44 f8 48 c7 c7 c0 a1 7b 8b c6 05 6b 79 20 05 01 e8 3f b3 81 00 <0f> 0b eb cd 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 41 57 41
RSP: 0018:ffffc900001079d0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88813fe03a80 RSI: ffffffff8166721c RDI: fffff52000020f2c
RBP: ffff88801cb6a3c0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffffff893d3e70 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdea5fca050 CR3: 0000000030a7f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 idr_for_each+0x117/0x230 lib/idr.c:208
 ieee80211_free_hw+0xa1/0x2f0 net/mac80211/main.c:1525
 mac80211_hwsim_del_radio drivers/net/wireless/mac80211_hwsim.c:4687 [inline]
 hwsim_exit_net+0x563/0xca0 drivers/net/wireless/mac80211_hwsim.c:5470
 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169
 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:606
 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
 worker_thread+0x669/0x1090 kernel/workqueue.c:2436
 kthread+0x2e8/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>