Hi,
I'm currently seeing a suspicous RCU usage warning:
===============================
[ INFO: suspicious RCU usage. ]
4.4.0-rc4-next-20151210 #23 Not tainted
-------------------------------
drivers/net/wireless/intel/iwlwifi/mvm/sta.c:1226 suspicious
rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 1, debug_locks = 0
4 locks held by irq/34-iwlwifi/978:
#0: (sync_cmd_lockdep_map){++++..}, at: [<ffffffffa073c1f5>]
iwl_pcie_irq_handler+0x5/0x1870 [iwlwifi]
#1: (&(&rxq->lock)->rlock){+.+...}, at: [<ffffffffa073cafa>]
iwl_pcie_irq_handler+0x90a/0x1870 [iwlwifi]
#2: (rcu_read_lock){......}, at: [<ffffffffa0827793>]
ieee80211_rx_napi+0xc3/0xbd0 [mac80211]
#3: (&(&local->rx_path_lock)->rlock){+.....}, at: [<ffffffffa0823fce>]
ieee80211_rx_handlers+0x3e/0x2c80 [mac80211]
stack backtrace:
CPU: 4 PID: 978 Comm: irq/34-iwlwifi Not tainted 4.4.0-rc4-next-20151210 #23
Hardware name: LENOVO 20BFS0EC00/20BFS0EC00, BIOS GMET62WW (2.10 ) 03/19/2014
0000000000000000 000000005a05ae61 ffff880407dc3760 ffffffff81434b69
ffff8804053e3200 ffff880407dc3790 ffffffff81106757 0000000000000000
ffff880408d8a868 ffff880408d8a868 ffff8804061cc630 ffff880407dc37b0
Call Trace:
[<ffffffff81434b69>] dump_stack+0x4b/0x72
[<ffffffff81106757>] lockdep_rcu_suspicious+0xd7/0x110
[<ffffffffa090eff8>] iwl_mvm_get_key_sta_id.part.3+0x88/0x90 [iwlmvm]
[<ffffffffa09116b1>] iwl_mvm_update_tkip_key+0x241/0x280 [iwlmvm]
[<ffffffffa08fde6c>] iwl_mvm_mac_update_tkip_key+0x1c/0x20 [iwlmvm]
[<ffffffffa0816e89>] ieee80211_tkip_decrypt_data+0x249/0x5f0 [mac80211]
[<ffffffff81729177>] ? skb_copy_bits+0x137/0x2f0
[<ffffffff8172ba55>] ? __pskb_pull_tail+0x85/0x3a0
[<ffffffffa080010e>] ieee80211_crypto_tkip_decrypt+0xce/0x150 [mac80211]
[<ffffffffa0824900>] ieee80211_rx_handlers+0x970/0x2c80 [mac80211]
[<ffffffff8110923a>] ? __lock_acquire+0x4ba/0x1b70
[<ffffffffa0826df4>] ieee80211_prepare_and_rx_handle+0x1e4/0xac0 [mac80211]
[<ffffffffa0827a06>] ieee80211_rx_napi+0x336/0xbd0 [mac80211]
[<ffffffffa0827793>] ? ieee80211_rx_napi+0xc3/0xbd0 [mac80211]
[<ffffffffa090adcd>] iwl_mvm_rx_rx_mpdu+0x4ad/0x880 [iwlmvm]
[<ffffffffa090ab02>] ? iwl_mvm_rx_rx_mpdu+0x1e2/0x880 [iwlmvm]
[<ffffffffa0905076>] iwl_mvm_rx+0x56/0x240 [iwlmvm]
[<ffffffffa073d17c>] iwl_pcie_irq_handler+0xf8c/0x1870 [iwlwifi]
[<ffffffff81882934>] ? __schedule+0x414/0xaf0
[<ffffffff81120310>] irq_thread_fn+0x20/0x50
[<ffffffff8112058b>] irq_thread+0x16b/0x1f0
[<ffffffff81882934>] ? __schedule+0x414/0xaf0
[<ffffffff811202f0>] ? irq_forced_thread_fn+0x70/0x70
[<ffffffff81120370>] ? wake_threads_waitq+0x30/0x30
[<ffffffff81120420>] ? irq_thread_dtor+0xb0/0xb0
[<ffffffff810d3091>] kthread+0x101/0x120
[<ffffffff81108999>] ? trace_hardirqs_on_caller+0x129/0x1b0
[<ffffffff810d2f90>] ? kthread_create_on_node+0x250/0x250
[<ffffffff81889e1f>] ret_from_fork+0x3f/0x70
[<ffffffff810d2f90>] ? kthread_create_on_node+0x250/0x250
If I revert 9513c5e18a0dc55a1fc9c890715098ba2315830b
(iwlwifi: mvm: Avoid dereferencing sta if it was already flushed)
The warning goes away. Known issue?
Thanks,
Laura
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