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lockdep splat on 4.13.3 (plus hacks)

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We are seeing deadlocks related to wifi in our 4.13.3+ kernels,
so I enabled lockdep and immediately saw this.  Anyone know if this
is a known issue?  Otherwise, I guess it could be related to some local
patch I have added...


[  476.172823] ============================================
[  476.176863] WARNING: possible recursive locking detected
[  476.180895] 4.13.3+ #1 Not tainted
[  476.183025] --------------------------------------------
[  476.187053] kworker/u8:2/281 is trying to acquire lock:
[  476.190993]  (&sta->ampdu_mlme.mtx){+.+...}, at: [<ffffffffa09cd4e8>] __ieee80211_start_rx_ba_session+0x178/0x670 [mac80211]
[  476.201004]
               but task is already holding lock:
[  476.204270]  (&sta->ampdu_mlme.mtx){+.+...}, at: [<ffffffffa09c93a6>] ieee80211_ba_session_work+0x46/0x2b0 [mac80211]
[  476.213645]
               other info that might help us debug this:
[  476.217587]  Possible unsafe locking scenario:

[  476.220930]        CPU0
[  476.222082]        ----
[  476.223236]   lock(&sta->ampdu_mlme.mtx);
[  476.225957]   lock(&sta->ampdu_mlme.mtx);
[  476.228673]
                *** DEADLOCK ***

[  476.230689]  May be due to missing lock nesting notation

[  476.234879] 3 locks held by kworker/u8:2/281:
[  476.237941]  #0:  ("%s"wiphy_name(local->hw.wiphy)){++++.+}, at: [<ffffffff8113df8f>] process_one_work+0x14f/0x6a0
[  476.247033]  #1:  ((&sta->ampdu_mlme.work)){+.+...}, at: [<ffffffff8113df8f>] process_one_work+0x14f/0x6a0
[  476.255393]  #2:  (&sta->ampdu_mlme.mtx){+.+...}, at: [<ffffffffa09c93a6>] ieee80211_ba_session_work+0x46/0x2b0 [mac80211]
[  476.265170]
               stack backtrace:
[  476.266928] CPU: 0 PID: 281 Comm: kworker/u8:2 Not tainted 4.13.3+ #1
[  476.272073] Hardware name: _ _/ , BIOS 5.11 08/26/2016
[  476.275927] Workqueue: phy1 ieee80211_ba_session_work [mac80211]
[  476.280640] Call Trace:
[  476.281792]  dump_stack+0x85/0xc7
[  476.283811]  __lock_acquire+0x14ba/0x1520
[  476.286526]  ? __save_stack_trace+0x6e/0xd0
[  476.289412]  ? ret_from_fork+0x2a/0x40
[  476.291867]  lock_acquire+0xac/0x200
[  476.294145]  ? lock_acquire+0xac/0x200
[  476.296610]  ? __ieee80211_start_rx_ba_session+0x178/0x670 [mac80211]
[  476.301766]  ? __ieee80211_start_rx_ba_session+0x178/0x670 [mac80211]
[  476.306910]  __mutex_lock+0x69/0x930
[  476.309194]  ? __ieee80211_start_rx_ba_session+0x178/0x670 [mac80211]
[  476.314343]  ? rcu_read_lock_sched_held+0x6d/0x80
[  476.317766]  ? __sdata_dbg+0x14a/0x1a0 [mac80211]
[  476.321181]  mutex_lock_nested+0x16/0x20
[  476.323810]  ? mutex_lock_nested+0x16/0x20
[  476.326626]  __ieee80211_start_rx_ba_session+0x178/0x670 [mac80211]
[  476.331627]  ieee80211_ba_session_work+0x157/0x2b0 [mac80211]
[  476.336078]  ? process_one_work+0x14f/0x6a0
[  476.338985]  process_one_work+0x1ce/0x6a0
[  476.341696]  worker_thread+0x46/0x400
[  476.344061]  kthread+0x10f/0x150
[  476.346001]  ? process_one_work+0x6a0/0x6a0
[  476.348886]  ? kthread_create_on_node+0x40/0x40
[  476.352122]  ret_from_fork+0x2a/0x40

Thanks,
Ben

--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc  http://www.candelatech.com




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