------------[ 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#0: kworker/u8:48/13907
Modules linked in:
CPU: 0 UID: 0 PID: 13907 Comm: kworker/u8:48 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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 13 28 22 f7 48 8d 3d 5c 85 1b 05 <67> 48 0f b9 3a 31 ff 48 89 de ba 02 00 00 00 e8 28 e1 65 fe 31 c0
RSP: 0018:ffffc900080d76d0 EFLAGS: 00010293
RAX: ffffffff8aa310dd RBX: ffff88802b922a00 RCX: ffff88803a5a8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8fbe9640
RBP: ffffc900080d77d8 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc900080d7740 R11: ffffffff8aa310d0 R12: ffffc900080d7740
R13: ffff888057e54df0 R14: 1ffff9200101aee4 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888125c85000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f15ab6c7dac CR3: 000000005e582000 CR4: 00000000003526f0
DR0: 0000000000000008 DR1: 0000000000000002 DR2: 0000000000000404
DR3: ffffffffefffff14 DR6: 00000000ffff0ff0 DR7: 0000000000000400
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+0x2f3/0x4a0 drivers/net/wireless/virtual/mac80211_hwsim_main.c:6218
 hwsim_exit_net+0xea6/0xf70 drivers/net/wireless/virtual/mac80211_hwsim_main.c:7196
 ops_exit_list net/core/net_namespace.c:199 [inline]
 ops_undo_list+0x43d/0x8d0 net/core/net_namespace.c:252
 cleanup_net+0x575/0x810 net/core/net_namespace.c:702
 process_one_work+0x93a/0x12b0 kernel/workqueue.c:3326
 process_scheduled_works kernel/workqueue.c:3409 [inline]
 worker_thread+0xb05/0x10d0 kernel/workqueue.c:3490
 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 13 28 22 f7       	call   0xf7222836
  23:	48 8d 3d 5c 85 1b 05 	lea    0x51b855c(%rip),%rdi        # 0x51b8586
* 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 28 e1 65 fe       	call   0xfe65e166
  3e:	31 c0                	xor    %eax,%eax