------------[ cut here ]------------
Have pending ack frames!
WARNING: net/mac80211/main.c:1712 at ieee80211_free_ack_frame+0x14/0x40 net/mac80211/main.c:1712, CPU#0: kworker/u8:19/6155
Modules linked in:
CPU: 0 UID: 0 PID: 6155 Comm: kworker/u8:19 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: netns cleanup_net
RIP: 0010:ieee80211_free_ack_frame+0x14/0x40 net/mac80211/main.c:1712
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 d3 8e fa f6 48 8d 3d bc 52 cc 04 <67> 48 0f b9 3a 31 ff 48 89 de ba 02 00 00 00 e8 a8 96 69 fe 31 c0
RSP: 0018:ffffc9000bb4f5d0 EFLAGS: 00010293
RAX: ffffffff8ac668ed RBX: ffff888077a39dc0 RCX: ffff88802aaf8000
RDX: 0000000000000000 RSI: ffff888077a39dc0 RDI: ffffffff8f92bbb0
RBP: ffffc9000bb4f6d8 R08: ffffc9000bb4f64f R09: 0000000000000000
R10: ffffc9000bb4f640 R11: ffffffff8ac668e0 R12: ffffc9000bb4f640
R13: ffff88805433e130 R14: ffff88807b85aff8 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888125e1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4d720c27b8 CR3: 0000000034708000 CR4: 00000000003526f0
DR0: 0000000000001880 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 idr_for_each+0x1b5/0x290 lib/idr.c:210
 ieee80211_free_hw+0x44/0x3d0 net/mac80211/main.c:1724
 mac80211_hwsim_del_radio+0x2de/0x460 drivers/net/wireless/virtual/mac80211_hwsim.c:5919
 hwsim_exit_net+0xed3/0xf80 drivers/net/wireless/virtual/mac80211_hwsim.c:6807
 ops_exit_list net/core/net_namespace.c:199 [inline]
 ops_undo_list+0x49a/0x990 net/core/net_namespace.c:252
 cleanup_net+0x4d8/0x7a0 net/core/net_namespace.c:696
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </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 d3 8e fa f6       	call   0xf6fa8ef6
  23:	48 8d 3d bc 52 cc 04 	lea    0x4cc52bc(%rip),%rdi        # 0x4cc52e6
* 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 a8 96 69 fe       	call   0xfe6996e6
  3e:	31 c0                	xor    %eax,%eax