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Date:   Wed, 07 Oct 2020 07:05:18 -0700
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Message-ID: <000000000000a07b5405b1153450@google.com>
Subject: Re: WARNING in ieee80211_free_ack_frame
From:   syzbot <syzbot+a063bbf0b15737362592@syzkaller.appspotmail.com>
To:     davem@davemloft.net, johannes@sipsolutions.net, kuba@kernel.org,
        linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org,
        netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com
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syzbot has found a reproducer for the following issue on:

HEAD commit:    c85fb28b Merge tag 'arm64-fixes' of git://git.kernel.org/p..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16933627900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c06bcf3cc963d91c
dashboard link: https://syzkaller.appspot.com/bug?extid=a063bbf0b15737362592
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=157d194f900000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a063bbf0b15737362592@syzkaller.appspotmail.com

------------[ cut here ]------------
Have pending ack frames!
WARNING: CPU: 0 PID: 37 at net/mac80211/main.c:1396 ieee80211_free_ack_frame+0x48/0x50 net/mac80211/main.c:1396
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 37 Comm: kworker/u4:2 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+0x198/0x1fd lib/dump_stack.c:118
 panic+0x382/0x7fb kernel/panic.c:231
 __warn.cold+0x20/0x4b kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x14/0x40 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+0x48/0x50 net/mac80211/main.c:1396
Code: e8 5d 43 b8 f9 48 89 ef e8 b5 dc a8 fe 31 c0 5b 5d c3 e8 4b 43 b8 f9 48 c7 c7 00 c0 5e 89 c6 05 66 b5 96 03 01 e8 3a 80 88 f9 <0f> 0b eb d2 0f 1f 40 00 41 57 41 56 41 55 49 89 d5 41 54 49 89 f4
RSP: 0018:ffffc90000ea79c8 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8880a91b8380 RSI: ffffffff815f5a55 RDI: fffff520001d4f2b
RBP: ffff888092f26540 R08: 0000000000000001 R09: ffff8880ae4318e7
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffffff87bdfb90 R14: 0000000000000000 R15: 0000000000000000
 idr_for_each+0x113/0x220 lib/idr.c:208
 ieee80211_free_hw+0x9b/0x2a0 net/mac80211/main.c:1412
 mac80211_hwsim_del_radio drivers/net/wireless/mac80211_hwsim.c:3285 [inline]
 hwsim_exit_net+0x5bc/0xc90 drivers/net/wireless/mac80211_hwsim.c:4037
 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:186
 cleanup_net+0x4ea/0xa00 net/core/net_namespace.c:603
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Kernel Offset: disabled
Rebooting in 86400 seconds..