From: Ville Syrjälä
I got the following lockdep warning about the rcu_dereference()s in
ieee80211_tx_h_select_key(). After tracing all callers of
ieee80211_tx_h_select_key() I discovered that ieee80211_get_buffered_bc()
and ieee80211_build_data_template() had the rcu_read_lock/unlock() but
three other places did not. So I just blindly added them and made the
read side critical section extend as far as the lifetime of 'tx' which
is where we seem to be stuffing the rcu protected pointers. No real clue
whether this is correct or not.
[ 854.573700] ../net/mac80211/tx.c:594 suspicious rcu_dereference_check()
usage!
[ 854.573704]
other info that might help us debug this:
[ 854.573707]
rcu_scheduler_active = 2, debug_locks = 1
[ 854.573712] 6 locks held by kworker/u2:0/2877:
[ 854.573715] #0: ("%s"wiphy_name(local->hw.wiphy)){.+}, at:
[] process_one_work+0x127/0x580
[ 854.573742] #1: ((>work)){+.+.+.}, at: []
process_one_work+0x127/0x580
[ 854.573758] #2: (>mtx){+.+.+.}, at: []
ieee80211_sta_work+0x23/0x1c70 [mac80211]
[ 854.573902] #3: (>sta_mtx){+.+.+.}, at: []
__sta_info_flush+0x60/0x160 [mac80211]
[ 854.573947] #4: (&(>axq_lock)->rlock){+.-...}, at: []
ath_tx_node_cleanup+0x5c/0x180 [ath9k]
[ 854.573973] #5: (&(>lock)->rlock){+.-...}, at: []
ieee80211_tx_dequeue+0x24/0xa80 [mac80211]
[ 854.574023]
stack backtrace:
[ 854.574028] CPU: 0 PID: 2877 Comm: kworker/u2:0 Not tainted 4.13.0-mgm-ovl+
#52
[ 854.574032] Hardware name: FUJITSU SIEMENS LIFEBOOK S6120/FJNB16C, BIOS
Version 1.26 05/10/2004
[ 854.574070] Workqueue: phy0 ieee80211_iface_work [mac80211]
[ 854.574076] Call Trace:
[ 854.574086] dump_stack+0x16/0x19
[ 854.574092] lockdep_rcu_suspicious+0xcb/0xf0
[ 854.574131] ieee80211_tx_h_select_key+0x1b5/0x500 [mac80211]
[ 854.574171] ieee80211_tx_dequeue+0x283/0xa80 [mac80211]
[ 854.574181] ath_tid_dequeue+0x84/0xf0 [ath9k]
[ 854.574189] ath_tx_node_cleanup+0xb8/0x180 [ath9k]
[ 854.574199] ath9k_sta_state+0x48/0xf0 [ath9k]
[ 854.574207] ? ath9k_del_ps_key.isra.19+0x60/0x60 [ath9k]
[ 854.574240] drv_sta_state+0xaf/0x8c0 [mac80211]
[ 854.574275] __sta_info_destroy_part2+0x10b/0x140 [mac80211]
[ 854.574309] __sta_info_flush+0xd5/0x160 [mac80211]
[ 854.574349] ieee80211_set_disassoc+0xd3/0x570 [mac80211]
[ 854.574390] ieee80211_sta_connection_lost+0x30/0x60 [mac80211]
[ 854.574431] ieee80211_sta_work+0x1ff/0x1c70 [mac80211]
[ 854.574436] ? mark_held_locks+0x62/0x90
[ 854.574443] ? _raw_spin_unlock_irqrestore+0x55/0x70
[ 854.574447] ? trace_hardirqs_on_caller+0x11c/0x1a0
[ 854.574452] ? trace_hardirqs_on+0xb/0x10
[ 854.574459] ? dev_mc_net_exit+0xe/0x20
[ 854.574467] ? skb_dequeue+0x48/0x70
[ 854.574504] ieee80211_iface_work+0x2d8/0x320 [mac80211]
[ 854.574509] process_one_work+0x1d1/0x580
[ 854.574513] ? process_one_work+0x127/0x580
[ 854.574519] worker_thread+0x31/0x380
[ 854.574525] kthread+0xd9/0x110
[ 854.574529] ? process_one_work+0x580/0x580
[ 854.574534] ? kthread_create_on_node+0x30/0x30
[ 854.574540] ret_from_fork+0x19/0x24
[ 854.574548] =
[ 854.574551] WARNING: suspicious RCU usage
[ 854.574555] 4.13.0-mgm-ovl+ #52 Not tainted
[ 854.574558] -
[ 854.574561] ../net/mac80211/tx.c:608 suspicious rcu_dereference_check()
usage!
[ 854.574564]
other info that might help us debug this:
[ 854.574568]
rcu_scheduler_active = 2, debug_locks = 1
[ 854.574572] 6 locks held by kworker/u2:0/2877:
[ 854.574574] #0: ("%s"wiphy_name(local->hw.wiphy)){.+}, at:
[] process_one_work+0x127/0x580
[ 854.574590] #1: ((>work)){+.+.+.}, at: []
process_one_work+0x127/0x580
[ 854.574606] #2: (>mtx){+.+.+.}, at: []
ieee80211_sta_work+0x23/0x1c70 [mac80211]
[ 854.574657] #3: (>sta_mtx){+.+.+.}, at: []
__sta_info_flush+0x60/0x160 [mac80211]
[ 854.574702] #4: (&(>axq_lock)->rlock){+.-...}, at: []
ath_tx_node_cleanup+0x5c/0x180 [ath9k]
[ 854.574721] #5: (&(>lock)->rlock){+.-...}, at: []
ieee80211_tx_dequeue+0x24/0xa80 [mac80211]
[ 854.574771]
stack backtrace:
[ 854.574775] CPU: 0 PID: 2877 Comm: kworker/u2:0 Not tainted 4.13.0-mgm-ovl+
#52
[ 854.574779] Hardware name: FUJITSU SIEMENS LIFEBOOK S6120/FJNB16C, BIOS
Version 1.26 05/10/2004
[ 854.574814] Workqueue: phy0 ieee80211_iface_work [mac80211]
[ 854.574821] Call Trace:
[ 854.574825] dump_stack+0x16/0x19
[ 854.574830] lockdep_rcu_suspicious+0xcb/0xf0
[ 854.574869] ieee80211_tx_h_select_key+0x44e/0x500 [mac80211]
[ 854.574908] ieee80211_tx_dequeue+0x283/0xa80 [mac80211]
[ 854.574919] ath_tid_dequeue+0x84/0xf0 [ath9k]
[ 854.574927] ath_tx_node_cleanup+0xb8/0x180 [ath9k]
[ 854.574936] ath9k_sta_state+0x48/0xf0 [ath9k]
[ 854.574945] ? ath9k_del_ps_key.isra.19+0x60/0x60 [ath9k]
[ 854.574978] drv_sta_state+0xaf/0x8c0 [mac80211]
[ 854.575012]