------------[ cut here ]------------ Have pending ack frames! WARNING: CPU: 1 PID: 15660 at net/mac80211/main.c:1389 ieee80211_free_ack_frame+0x48/0x50 net/mac80211/main.c:1389 Modules linked in: CPU: 1 PID: 15660 Comm: kworker/u4:11 Not tainted 5.11.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net RIP: 0010:ieee80211_free_ack_frame+0x48/0x50 net/mac80211/main.c:1389 Code: e8 ad a7 25 f9 48 89 ef e8 25 ec a4 fe 31 c0 5b 5d c3 e8 9b a7 25 f9 48 c7 c7 e0 ce 62 8a c6 05 a7 83 a2 04 01 e8 b2 65 6d 00 <0f> 0b eb d2 0f 1f 40 00 41 57 41 56 41 55 49 89 d5 41 54 49 89 f4 RSP: 0018:ffffc900064df9d8 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88801e561bc0 RSI: ffffffff815b6445 RDI: fffff52000c9bf2d RBP: ffff888061afd8c0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815af61e R11: 0000000000000000 R12: dffffc0000000000 R13: ffffffff884d15f0 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff01b98fe0 CR3: 0000000010f1c000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: idr_for_each+0x113/0x220 lib/idr.c:208 ieee80211_free_hw+0x9b/0x2b0 net/mac80211/main.c:1405 mac80211_hwsim_del_radio drivers/net/wireless/mac80211_hwsim.c:3435 [inline] hwsim_exit_net+0x5bc/0xc90 drivers/net/wireless/mac80211_hwsim.c:4187 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:187 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:604 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296