When running kernel 3.4-rc2 from wireless testing, I got the following logged:
[ 2299.344437] ===============================
[ 2299.344443] [ INFO: suspicious RCU usage. ]
[ 2299.344452] 3.4.0-rc2-wl+ #222 Not tainted
[ 2299.344458] -------------------------------
[ 2299.344466] net/mac80211/sta_info.h:449 suspicious
rcu_dereference_protected() usage!
[ 2299.344472]
[ 2299.344474] other info that might help us debug this:
[ 2299.344477]
[ 2299.344484]
[ 2299.344486] rcu_scheduler_active = 1, debug_locks = 0
[ 2299.344493] 1 lock held by swapper/1/0:
[ 2299.344499] #0: (&tid_tx->session_timer){+.-...}, at: [<ffffffff8104850a>]
run_timer_softirq+0xfa/0x6e0
[ 2299.344533]
[ 2299.344535] stack backtrace:
[ 2299.344544] Pid: 0, comm: swapper/1 Not tainted 3.4.0-rc2-wl+ #222
[ 2299.344551] Call Trace:
[ 2299.344557] <IRQ> [<ffffffff81092fdd>] lockdep_rcu_suspicious+0xfd/0x130
[ 2299.344651] [<ffffffffa05db673>] sta_tx_agg_session_timer_expired+0xe3/0x100
[mac80211]
[ 2299.344664] [<ffffffff81048595>] run_timer_softirq+0x185/0x6e0
[ 2299.344676] [<ffffffff8104850a>] ? run_timer_softirq+0xfa/0x6e0
[ 2299.344714] [<ffffffffa05db590>] ? ieee80211_stop_tx_ba_session+0x240/0x240
[mac80211]
[ 2299.344732] [<ffffffff81040156>] __do_softirq+0xc6/0x3f0
[ 2299.344748] [<ffffffff8139c934>] ? _raw_spin_lock+0x44/0x50
[ 2299.344758] [<ffffffff8139d0f6>] ? _raw_spin_unlock+0x26/0x40
[ 2299.344771] [<ffffffff8139f24c>] call_softirq+0x1c/0x30
[ 2299.344785] [<ffffffff81004785>] do_softirq+0x85/0xc0
[ 2299.344795] [<ffffffff810407b6>] irq_exit+0xa6/0xe0
[ 2299.344806] [<ffffffff8100424e>] do_IRQ+0x5e/0xd0
[ 2299.344816] [<ffffffff8139d56c>] common_interrupt+0x6c/0x6c
[ 2299.344823] <EOI> [<ffffffff8100c042>] ? default_idle+0x62/0x4f0
[ 2299.344844] [<ffffffff8100c040>] ? default_idle+0x60/0x4f0
[ 2299.344854] [<ffffffff8100c524>] amd_e400_idle+0x54/0x100
[ 2299.344864] [<ffffffff8100ce96>] cpu_idle+0x96/0xe0
[ 2299.344875] [<ffffffff8138fbc6>] start_secondary+0x1b7/0x1bb
The wireless driver in use was rtl8192ce.
Larry
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