Description of problem:
This trigger was create without my interventions. I don't know what was reason this error

Additional info:
reporter:       libreport-2.3.0
WARNING: CPU: 0 PID: 7386 at net/mac80211/agg-tx.c:698 ieee80211_start_tx_ba_cb+0x134/0x140 [mac80211]()
Modules linked in: nls_utf8 isofs fuse uas usb_storage ccm ip6t_rpfilter ip6t_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw kvm_amd kvm arc4 ath9k ath9k_common ath9k_hw ath mac80211 cfg80211 uvcvideo acer_wmi videobuf2_vmalloc videobuf2_memops videobuf2_core sparse_keymap v4l2_common snd_hda_codec_realtek rfkill snd_hda_codec_generic snd_hda_codec_hdmi videodev rtsx_pci_ms media memstick k10temp serio_raw shpchp snd_hda_intel joydev snd_hda_controller snd_hda_codec snd_hwdep snd_seq wmi snd_seq_device
 snd_pcm snd_timer snd video soundcore i2c_piix4 acpi_cpufreq radeon rtsx_pci_sdmmc mmc_core atl1c i2c_algo_bit drm_kms_helper rtsx_pci mfd_core ttm drm
CPU: 0 PID: 7386 Comm: kworker/u8:1 Not tainted 3.17.4-301.fc21.x86_64 #1
Hardware name: Acer Aspire E1-521/EA50_BZ  , BIOS V1.12 10/23/2012
Workqueue: phy0 ieee80211_iface_work [mac80211]
 0000000000000000 000000000d974ae7 ffff8800c2af7d28 ffffffff8173f929
 0000000000000000 ffff8800c2af7d60 ffffffff810970ad 0000000000000000
 ffff8800da987000 ffff8800da987340 ffff8800d91f8ae0 ffff8800d91f8680
Call Trace:
 [<ffffffff8173f929>] dump_stack+0x45/0x56
 [<ffffffff810970ad>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff810971da>] warn_slowpath_null+0x1a/0x20
 [<ffffffffa0482e34>] ieee80211_start_tx_ba_cb+0x134/0x140 [mac80211]
 [<ffffffffa0488ffa>] ieee80211_iface_work+0x25a/0x420 [mac80211]
 [<ffffffff810ad5dd>] ? pwq_activate_delayed_work+0x3d/0x80
 [<ffffffff810af88d>] process_one_work+0x14d/0x400
 [<ffffffff810b021b>] worker_thread+0x6b/0x4a0
 [<ffffffff810b01b0>] ? rescuer_thread+0x2a0/0x2a0
 [<ffffffff810b52fa>] kthread+0xea/0x100
 [<ffffffff810b5210>] ? kthread_create_on_node+0x1a0/0x1a0
 [<ffffffff81746a3c>] ret_from_fork+0x7c/0xb0
 [<ffffffff810b5210>] ? kthread_create_on_node+0x1a0/0x1a0

Potential duplicate: bug 1169064