------------[ cut here ]------------
Have pending ack frames!
WARNING: net/mac80211/main.c:1749 at ieee80211_free_ack_frame+0x14/0x40 net/mac80211/main.c:1749, CPU#1: kworker/u8:19/2189
Modules linked in:
CPU: 1 UID: 0 PID: 2189 Comm: kworker/u8:19 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: netns cleanup_net
RIP: 0010:ieee80211_free_ack_frame+0x14/0x40 net/mac80211/main.c:1749
Code: 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 53 48 89 f3 e8 53 90 28 f7 48 8d 3d fc be 20 05 <67> 48 0f b9 3a 31 ff 48 89 de ba 02 00 00 00 e8 78 e2 65 fe 31 c0
RSP: 0018:ffffc90008147670 EFLAGS: 00010293
RAX: ffffffff8a9c8bcd RBX: ffff88802de8db40 RCX: ffff88802c538000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8fbd4ad0
RBP: ffffc90008147778 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc900081476e0 R11: ffffffff8a9c8bc0 R12: ffffc900081476e0
R13: ffff88805e3ff9f0 R14: 1ffff92001028ed8 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888125dc7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f039d3bee9c CR3: 000000002af10000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 idr_for_each+0x1c9/0x2a0 lib/idr.c:210
 ieee80211_free_hw+0x38/0x3c0 net/mac80211/main.c:1761
 mac80211_hwsim_del_radio+0x2f3/0x490 drivers/net/wireless/virtual/mac80211_hwsim_main.c:6163
 hwsim_exit_net+0xf02/0xfc0 drivers/net/wireless/virtual/mac80211_hwsim_main.c:7135
 ops_exit_list net/core/net_namespace.c:199 [inline]
 ops_undo_list+0x49f/0x940 net/core/net_namespace.c:252
 cleanup_net+0x56e/0x800 net/core/net_namespace.c:702
 process_one_work+0x98b/0x1630 kernel/workqueue.c:3306
 process_scheduled_works kernel/workqueue.c:3389 [inline]
 worker_thread+0xb49/0x1140 kernel/workqueue.c:3470
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess):
   0:	84 00                	test   %al,(%rax)
   2:	00 00                	add    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	90                   	nop
   7:	90                   	nop
   8:	90                   	nop
   9:	90                   	nop
   a:	90                   	nop
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	f3 0f 1e fa          	endbr64
  1a:	53                   	push   %rbx
  1b:	48 89 f3             	mov    %rsi,%rbx
  1e:	e8 53 90 28 f7       	call   0xf7289076
  23:	48 8d 3d fc be 20 05 	lea    0x520befc(%rip),%rdi        # 0x520bf26
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	31 ff                	xor    %edi,%edi
  31:	48 89 de             	mov    %rbx,%rsi
  34:	ba 02 00 00 00       	mov    $0x2,%edx
  39:	e8 78 e2 65 fe       	call   0xfe65e2b6
  3e:	31 c0                	xor    %eax,%eax