------------[ cut here ]------------
Have pending ack frames!
WARNING: net/mac80211/main.c:1722 at ieee80211_free_ack_frame+0x14/0x40 net/mac80211/main.c:1722, CPU#1: kworker/u8:8/1163
Modules linked in:
CPU: 1 UID: 0 PID: 1163 Comm: kworker/u8:8 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026
Workqueue: netns cleanup_net
RIP: 0010:ieee80211_free_ack_frame+0x14/0x40 net/mac80211/main.c:1722
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 43 87 af f6 48 8d 3d cc 94 0c 05 <67> 48 0f b9 3a 31 ff 48 89 de ba 02 00 00 00 e8 d8 94 5e fe 31 c0
RSP: 0018:ffffc90005547630 EFLAGS: 00010293
RAX: ffffffff8b16166d RBX: ffff88804cd95780 RCX: ffff88802846db80
RDX: 0000000000000000 RSI: ffff88804cd95780 RDI: ffffffff9022ab40
RBP: ffffc90005547738 R08: ffffc900055476af R09: 0000000000000000
R10: ffffc900055476a0 R11: ffffffff8b161660 R12: ffffc900055476a0
R13: ffff88805917b470 R14: 1ffff92000aa8ed0 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888125563000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f86883456b8 CR3: 0000000062aa8000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000080083
DR3: ffffffffefffff16 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 idr_for_each+0x1c6/0x2a0 lib/idr.c:210
 ieee80211_free_hw+0x44/0x3d0 net/mac80211/main.c:1734
 mac80211_hwsim_del_radio+0x2f3/0x490 drivers/net/wireless/virtual/mac80211_hwsim.c:5919
 hwsim_exit_net+0xede/0xfa0 drivers/net/wireless/virtual/mac80211_hwsim.c:6807
 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:704
 process_one_work kernel/workqueue.c:3275 [inline]
 process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 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 43 87 af f6       	call   0xf6af8766
  23:	48 8d 3d cc 94 0c 05 	lea    0x50c94cc(%rip),%rdi        # 0x50c94f6
* 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 d8 94 5e fe       	call   0xfe5e9516
  3e:	31 c0                	xor    %eax,%eax