Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx> wrote: > ieee80211_find_sta_by_ifaddr() must be called under the RCU lock and > the resulting pointer is only valid under RCU lock as well. > > Fix ath10k_wmi_tlv_parse_peer_stats_info() to hold RCU lock before it > calls ieee80211_find_sta_by_ifaddr() and release it when the resulting > pointer is no longer needed. The log below shows the problem. > > While at it, fix ath10k_wmi_tlv_op_pull_peer_stats_info() to do the same. > > ============================= > WARNING: suspicious RCU usage > 5.11.0-rc7+ #20 Tainted: G W > ----------------------------- > include/linux/rhashtable.h:594 suspicious rcu_dereference_check() usage! > other info that might help us debug this: > rcu_scheduler_active = 2, debug_locks = 1 > no locks held by ksoftirqd/5/44. > > stack backtrace: > CPU: 5 PID: 44 Comm: ksoftirqd/5 Tainted: G W 5.11.0-rc7+ #20 > Hardware name: LENOVO 10VGCTO1WW/3130, BIOS M1XKT45A 08/21/2019 > Call Trace: > dump_stack+0x7d/0x9f > lockdep_rcu_suspicious+0xdb/0xe5 > __rhashtable_lookup+0x1eb/0x260 [mac80211] > ieee80211_find_sta_by_ifaddr+0x5b/0xc0 [mac80211] > ath10k_wmi_tlv_parse_peer_stats_info+0x3e/0x90 [ath10k_core] > ath10k_wmi_tlv_iter+0x6a/0xc0 [ath10k_core] > ? ath10k_wmi_tlv_op_pull_mgmt_tx_bundle_compl_ev+0xe0/0xe0 [ath10k_core] > ath10k_wmi_tlv_op_rx+0x5da/0xda0 [ath10k_core] > ? trace_hardirqs_on+0x54/0xf0 > ? ath10k_ce_completed_recv_next+0x4e/0x60 [ath10k_core] > ath10k_wmi_process_rx+0x1d/0x40 [ath10k_core] > ath10k_htc_rx_completion_handler+0x115/0x180 [ath10k_core] > ath10k_pci_process_rx_cb+0x149/0x1b0 [ath10k_pci] > ? ath10k_htc_process_trailer+0x2d0/0x2d0 [ath10k_core] > ? ath10k_pci_sleep.part.0+0x6a/0x80 [ath10k_pci] > ath10k_pci_htc_rx_cb+0x15/0x20 [ath10k_pci] > ath10k_ce_per_engine_service+0x61/0x80 [ath10k_core] > ath10k_ce_per_engine_service_any+0x7d/0xa0 [ath10k_core] > ath10k_pci_napi_poll+0x48/0x120 [ath10k_pci] > net_rx_action+0x136/0x500 > __do_softirq+0xc6/0x459 > ? smpboot_thread_fn+0x2b/0x1f0 > run_ksoftirqd+0x2b/0x60 > smpboot_thread_fn+0x116/0x1f0 > kthread+0x14b/0x170 > ? smpboot_register_percpu_thread+0xe0/0xe0 > ? __kthread_bind_mask+0x70/0x70 > ret_from_fork+0x22/0x30 > > Signed-off-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx> Unlucky timing also on this one, it conflicts with a patch I applied yesterday: https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git/commit/?h=ath-next&id=2615e3cdbd9c0e864f5906279c952a309871d225 Can you redo the patch to only change ath10k_wmi_event_tdls_peer()? error: patch failed: drivers/net/wireless/ath/ath10k/wmi-tlv.c:240 error: drivers/net/wireless/ath/ath10k/wmi-tlv.c: patch does not apply stg import: Diff does not apply cleanly Patch set to Changes Requested. -- https://patchwork.kernel.org/project/linux-wireless/patch/23a1333dfb0367cc69e7177a2e373df0b6d42980.1612915444.git.skhan@xxxxxxxxxxxxxxxxxxx/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
