IPVS: stopping backup sync thread 31155 ... ------------[ cut here ]------------ Have pending ack frames! WARNING: CPU: 1 PID: 324 at net/mac80211/main.c:1416 ieee80211_free_ack_frame+0x4a/0x50 net/mac80211/main.c:1416 Modules linked in: CPU: 1 PID: 324 Comm: kworker/u4:4 Not tainted 5.17.0-rc6-syzkaller-01759-g80901bff8129 #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+0x4a/0x50 net/mac80211/main.c:1416 Code: 11 e1 f8 48 89 ef 31 f6 e8 23 8e 93 fe 31 c0 5b 5d c3 e8 09 11 e1 f8 48 c7 c7 00 27 cf 8a c6 05 ab 29 e8 04 01 e8 dd d0 73 00 <0f> 0b eb d0 66 90 41 57 41 56 49 89 f6 41 55 41 54 49 89 d4 55 48 RSP: 0018:ffffc9000272f9e0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888019008000 RSI: ffffffff815fe2b8 RDI: fffff520004e5f2e RBP: ffff8880199ea280 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815f894e R11: 0000000000000000 R12: dffffc0000000000 R13: ffffffff88979c90 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000559f572faff8 CR3: 000000007453d000 CR4: 00000000003506e0 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:1432 mac80211_hwsim_del_radio drivers/net/wireless/mac80211_hwsim.c:3595 [inline] hwsim_exit_net+0x55f/0xca0 drivers/net/wireless/mac80211_hwsim.c:4359 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:162 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307 worker_thread+0x657/0x1110 kernel/workqueue.c:2454 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295