IPVS: stopping backup sync thread 11185 ... ------------[ cut here ]------------ Have pending ack frames! WARNING: CPU: 1 PID: 36 at net/mac80211/main.c:1713 ieee80211_free_ack_frame+0x4d/0x60 net/mac80211/main.c:1713 Modules linked in: CPU: 1 UID: 0 PID: 36 Comm: kworker/u8:2 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: netns cleanup_net RIP: 0010:ieee80211_free_ack_frame+0x4d/0x60 net/mac80211/main.c:1713 Code: 00 00 e8 46 b9 6b fe 31 c0 5b c3 cc cc cc cc cc e8 98 f8 0b f7 c6 05 9a 00 b3 04 01 90 48 c7 c7 60 2c 89 8c e8 64 14 cf f6 90 <0f> 0b 90 90 eb c8 cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 RSP: 0018:ffffc90000ac7590 EFLAGS: 00010246 RAX: ab7c4ebeff486500 RBX: ffff8880785c6000 RCX: ffff8881432e9e40 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002 RBP: ffffc90000ac7698 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1bba684 R12: ffffc90000ac7600 R13: ffff888056713730 R14: ffff88807e292ff8 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff88812623b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000040 CR3: 000000000dd38000 CR4: 00000000003526f0 Call Trace: idr_for_each+0x1b5/0x290 lib/idr.c:208 ieee80211_free_hw+0x44/0x3d0 net/mac80211/main.c:1725 mac80211_hwsim_del_radio+0x2de/0x460 drivers/net/wireless/virtual/mac80211_hwsim.c:5918 hwsim_exit_net+0xef4/0xfb0 drivers/net/wireless/virtual/mac80211_hwsim.c:6806 ops_exit_list net/core/net_namespace.c:199 [inline] ops_undo_list+0x49a/0x990 net/core/net_namespace.c:252 cleanup_net+0x4d8/0x820 net/core/net_namespace.c:695 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245