------------[ cut here ]------------ Have pending ack frames! WARNING: CPU: 1 PID: 79 at net/mac80211/main.c:1396 ieee80211_free_ack_frame+0x3d/0x50 net/mac80211/main.c:1396 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 79 Comm: kworker/u4:3 Not tainted 5.9.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d6/0x29e lib/dump_stack.c:118 panic+0x2c0/0x800 kernel/panic.c:231 __warn+0x227/0x250 kernel/panic.c:600 report_bug+0x1b1/0x2e0 lib/bug.c:198 handle_bug+0x42/0x80 arch/x86/kernel/traps.c:234 exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:254 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536 RIP: 0010:ieee80211_free_ack_frame+0x3d/0x50 net/mac80211/main.c:1396 Code: 19 8d 90 f9 48 89 df e8 c1 6f a9 fe 31 c0 5b c3 e8 08 8d 90 f9 c6 05 8b 38 c7 01 01 48 c7 c7 42 19 4f 89 31 c0 e8 b3 2b 62 f9 <0f> 0b eb d6 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 41 57 RSP: 0018:ffffc90001077b08 EFLAGS: 00010246 RAX: db698b693513e900 RBX: ffff888093c28c00 RCX: ffff8880a901e1c0 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: ffff88808558ccf0 R08: ffffffff815e2880 R09: ffffed1015d241c3 R10: ffffed1015d241c3 R11: 0000000000000000 R12: dffffc0000000000 R13: ffffc90001077b40 R14: dffffc0000000000 R15: 1ffff9200020ef68 idr_for_each+0x16b/0x260 lib/idr.c:208 ieee80211_free_hw+0xc0/0x3c0 net/mac80211/main.c:1412 mac80211_hwsim_del_radio+0x282/0x3e0 drivers/net/wireless/mac80211_hwsim.c:3285 hwsim_exit_net+0x553/0x5e0 drivers/net/wireless/mac80211_hwsim.c:4037 ops_exit_list net/core/net_namespace.c:186 [inline] cleanup_net+0x708/0xba0 net/core/net_namespace.c:603 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Kernel Offset: disabled Rebooting in 86400 seconds..