Comment 244 for bug 1239578

INFO: task kworker/u16:1:3631 blocked for more than 120 seconds.
      Tainted: G OE 3.17.0-031700-generic #201410060605
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u16:1 D 0000000000000001 0 3631 2 0x00000000
Workqueue: phy0 ieee80211_ba_session_work [mac80211]
 ffff8801c901fb98 0000000000000046 ffff8801c901fb48 ffff88021f254580
 ffff8801c901ffd8 0000000000014580 ffff8801c9295080 0000000000014580
 ffff880213a51400 ffff880210fd1e00 0000000a00000007 ffff8801c901fcd8
Call Trace:
 [<ffffffff827a0279>] schedule+0x29/0x70
 [<ffffffff827a3275>] schedule_timeout+0x1b5/0x210
 [<ffffffffc0ab265c>] ? rtl92ee_phy_set_bb_reg+0x9c/0x160 [rtl8192ee]
 [<ffffffffc0ab2969>] ? rtl92ee_phy_set_rf_reg+0xf9/0x220 [rtl8192ee]
 [<ffffffff827a15b7>] wait_for_completion+0xa7/0x160
 [<ffffffff820a1030>] ? try_to_wake_up+0x290/0x290
 [<ffffffff820d59d0>] ? call_rcu_bh+0x20/0x20
 [<ffffffff820d1b2d>] wait_rcu_gp+0x4d/0x60
 [<ffffffff820d1b40>] ? wait_rcu_gp+0x60/0x60
 [<ffffffff820d475a>] synchronize_sched+0x3a/0x50
 [<ffffffff8268409c>] synchronize_net+0x1c/0x40
 [<ffffffffc0ad657e>] ___ieee80211_stop_tx_ba_session+0x10e/0x510 [mac80211]
 [<ffffffffc0ad5070>] ieee80211_ba_session_work+0x190/0x1a0 [mac80211]
 [<ffffffff8208ce2e>] process_one_work+0x14e/0x460
 [<ffffffff8208d7ab>] worker_thread+0x11b/0x3f0
 [<ffffffff8208d690>] ? create_worker+0x1e0/0x1e0
 [<ffffffff820932b9>] kthread+0xc9/0xe0
 [<ffffffff820931f0>] ? flush_kthread_worker+0x90/0x90
 [<ffffffff827a467c>] ret_from_fork+0x7c/0xb0
 [<ffffffff820931f0>] ? flush_kthread_worker+0x90/0x90
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