Jiri Kosina <jkosina@xxxxxxx> wrote:
> From: Jiri Kosina <jkosina@xxxxxxx>
> Subject: [PATCH] rtw89: fix RCU usage in rtw89_core_txq_push()
>
> ieee80211_tx_h_select_key() is performing a series of RCU dereferences,
> but rtw89_core_txq_push() is calling it (via ieee80211_tx_dequeue_ni())
> without RCU read-side lock held; fix that.
>
> This addresses the splat below.
>
> =============================
> WARNING: suspicious RCU usage
> 5.17.0-rc4-00003-gccad664b7f14 #3 Tainted: G E
> -----------------------------
> net/mac80211/tx.c:593 suspicious rcu_dereference_check() usage!
>
> other info that might help us debug this:
>
> rcu_scheduler_active = 2, debug_locks = 1
> 2 locks held by kworker/u33:0/184:
> #0: ffff9c0b14811d38 ((wq_completion)rtw89_tx_wq){+.+.}-{0:0}, at: process_one_work+0x258/0x660
> #1: ffffb97380cf3e78 ((work_completion)(&rtwdev->txq_work)){+.+.}-{0:0}, at: process_one_work+0x258/0x660
>
> stack backtrace:
> CPU: 8 PID: 184 Comm: kworker/u33:0 Tainted: G E 5.17.0-rc4-00003-gccad664b7f14 #3 473b49ab0e7c2d6af2900c756bfd04efd7a9de13
> Hardware name: LENOVO 20UJS2B905/20UJS2B905, BIOS R1CET63W(1.32 ) 04/09/2021
> Workqueue: rtw89_tx_wq rtw89_core_txq_work [rtw89_core]
> Call Trace:
> <TASK>
> dump_stack_lvl+0x58/0x71
> ieee80211_tx_h_select_key+0x2c0/0x530 [mac80211 911c23e2351c0ae60b597a67b1204a5ea955e365]
> ieee80211_tx_dequeue+0x1a7/0x1260 [mac80211 911c23e2351c0ae60b597a67b1204a5ea955e365]
> rtw89_core_txq_work+0x1a6/0x420 [rtw89_core b39ba493f2e517ad75e0f8187ecc24edf58bbbea]
> process_one_work+0x2d8/0x660
> worker_thread+0x39/0x3e0
> ? process_one_work+0x660/0x660
> kthread+0xe5/0x110
> ? kthread_complete_and_exit+0x20/0x20
> ret_from_fork+0x22/0x30
> </TASK>
>
> =============================
> WARNING: suspicious RCU usage
> 5.17.0-rc4-00003-gccad664b7f14 #3 Tainted: G E
> -----------------------------
> net/mac80211/tx.c:607 suspicious rcu_dereference_check() usage!
>
> other info that might help us debug this:
>
> rcu_scheduler_active = 2, debug_locks = 1
> 2 locks held by kworker/u33:0/184:
> #0: ffff9c0b14811d38 ((wq_completion)rtw89_tx_wq){+.+.}-{0:0}, at: process_one_work+0x258/0x660
> #1: ffffb97380cf3e78 ((work_completion)(&rtwdev->txq_work)){+.+.}-{0:0}, at: process_one_work+0x258/0x660
>
> stack backtrace:
> CPU: 8 PID: 184 Comm: kworker/u33:0 Tainted: G E 5.17.0-rc4-00003-gccad664b7f14 #3 473b49ab0e7c2d6af2900c756bfd04efd7a9de13
> Hardware name: LENOVO 20UJS2B905/20UJS2B905, BIOS R1CET63W(1.32 ) 04/09/2021
> Workqueue: rtw89_tx_wq rtw89_core_txq_work [rtw89_core]
> Call Trace:
> <TASK>
> dump_stack_lvl+0x58/0x71
> ieee80211_tx_h_select_key+0x464/0x530 [mac80211 911c23e2351c0ae60b597a67b1204a5ea955e365]
> ieee80211_tx_dequeue+0x1a7/0x1260 [mac80211 911c23e2351c0ae60b597a67b1204a5ea955e365]
> rtw89_core_txq_work+0x1a6/0x420 [rtw89_core b39ba493f2e517ad75e0f8187ecc24edf58bbbea]
> process_one_work+0x2d8/0x660
> worker_thread+0x39/0x3e0
> ? process_one_work+0x660/0x660
> kthread+0xe5/0x110
> ? kthread_complete_and_exit+0x20/0x20
> ret_from_fork+0x22/0x30
> </TASK>
>
> Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
> Acked-by: Ping-Ke Shih <pkshih@xxxxxxxxxxx>
Patch applied to wireless-next.git, thanks.
f3d825a35920 rtw89: fix RCU usage in rtw89_core_txq_push()
--
https://patchwork.kernel.org/project/linux-wireless/patch/nycvar.YFH.7.76.2202152037000.11721@xxxxxxxxxxxxx/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
