------------[ cut here ]------------
Have pending ack frames!
WARNING: net/mac80211/main.c:1746 at ieee80211_free_ack_frame+0x14/0x40 net/mac80211/main.c:1746, CPU#1: kworker/u8:18/12293
Modules linked in:
CPU: 1 UID: 0 PID: 12293 Comm: kworker/u8:18 Tainted: G             L      syzkaller #0 PREEMPT(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:1746
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 83 db b2 f6 48 8d 3d 9c 59 2f 05 <67> 48 0f b9 3a 31 ff 48 89 de ba 02 00 00 00 e8 f8 0f 63 fe 31 c0
RSP: 0018:ffffc9000e497610 EFLAGS: 00010293
RAX: ffffffff8b12da7d RBX: ffff8880578f38c0 RCX: ffff888034e75c40
RDX: 0000000000000000 RSI: ffff8880578f38c0 RDI: ffffffff90423420
RBP: ffffc9000e497718 R08: ffffc9000e49768f R09: 0000000000000000
R10: ffffc9000e497680 R11: ffffffff8b12da70 R12: ffffc9000e497680
R13: ffff888055cc98f0 R14: 1ffff92001c92ecc R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888125387000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff52d9a3f50 CR3: 00000000503de000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 idr_for_each+0x1c6/0x2a0 lib/idr.c:210
 ieee80211_free_hw+0x44/0x3d0 net/mac80211/main.c:1758
 mac80211_hwsim_del_radio+0x2f3/0x4a0 drivers/net/wireless/virtual/mac80211_hwsim.c:6135
 hwsim_exit_net+0xede/0xfa0 drivers/net/wireless/virtual/mac80211_hwsim.c:7029
 ops_exit_list net/core/net_namespace.c:199 [inline]
 ops_undo_list+0x49f/0x940 net/core/net_namespace.c:252
 cleanup_net+0x56b/0x800 net/core/net_namespace.c:702
 process_one_work kernel/workqueue.c:3314 [inline]
 process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3397
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3478
 kthread+0x389/0x470 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 83 db b2 f6       	call   0xf6b2dba6
  23:	48 8d 3d 9c 59 2f 05 	lea    0x52f599c(%rip),%rdi        # 0x52f59c6
* 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 f8 0f 63 fe       	call   0xfe631036
  3e:	31 c0                	xor    %eax,%eax