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From: "Paul E. McKenney" <paulmck@kernel.org>
To: Fabio Estevam <festevam@gmail.com>
Cc: Kalle Valo <kvalo@codeaurora.org>,
	ath10k@lists.infradead.org, linux-mmc <linux-mmc@vger.kernel.org>,
	Ulf Hansson <ulf.hansson@linaro.org>, Marek Vasut <marex@denx.de>,
	qais.yousef@arm.com
Subject: Re: NOHZ tick-stop error with ath10k SDIO
Date: Wed, 18 Aug 2021 08:43:58 -0700	[thread overview]
Message-ID: <20210818154358.GS4126399@paulmck-ThinkPad-P17-Gen-1> (raw)
In-Reply-To: <CAOMZO5AAvZic-NFbYYSVfOxY-27QukXMX68f9eDmhbqAkBRKRw@mail.gmail.com>

On Wed, Aug 18, 2021 at 12:18:25PM -0300, Fabio Estevam wrote:
> Hi,
> 
> When launching the hostapd application on a i.MX7 based board with an
> ath10k device connected via SDIO, the following "NOHZ tick-stop error"
> messages are seen:
> 
> # hostapd /etc/wifi.conf
> Configuration file: /etc/wifi.conf
> wlan0: interface state UNINITIALIZED->COUNTRY_UPDATE
> [   63.021149] NOHZ tick-stop error: Non-RCU local softirq work is
> pending, handler #08!!!
> Using interface wlan0 with hwaddr 00:1f:7b:31:04:a0 and ssid "thessid"
> [   67.332470] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
> wlan0: interface state COUNTRY_UPDATE->ENABLED
> wlan0: AP-ENABLED
> [   68.025845] NOHZ tick-stop error: Non-RCU local softirq work is
> pending, handler #08!!!
> [   69.025973] NOHZ tick-stop error: Non-RCU local softirq work is
> pending, handler #08!!!
> [   69.607432] cfg80211: failed to load regulatory.db
> [   72.026748] NOHZ tick-stop error: Non-RCU local softirq work is
> pending, handler #08!!!
> [   73.027039] NOHZ tick-stop error: Non-RCU local softirq work is
> pending, handler #08!!!
> [   74.027159] NOHZ tick-stop error: Non-RCU local softirq work is
> pending, handler #08!!!
> [   75.027109] NOHZ tick-stop error: Non-RCU local softirq work is
> pending, handler #08!!!
> [   76.027461] NOHZ tick-stop error: Non-RCU local softirq work is
> pending, handler #08!!!
> [   77.027391] NOHZ tick-stop error: Non-RCU local softirq work is
> pending, handler #08!!!
> [   78.027560] NOHZ tick-stop error: Non-RCU local softirq work is
> pending, handler #08!!!
> 
> This happens on all kernel versions from 5.10  to 5.13.
> 
> Any ideas on how to fix this problem?

I believe that you need this commit (and possibly some prerequsites):

47c218dcae65 ("tick/sched: Prevent false positive softirq pending warnings on RT")

Adding Qais on CC for his thoughts.

							Thanx, Paul

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  reply	other threads:[~2021-08-18 15:44 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-18 15:18 Fabio Estevam
2021-08-18 15:43 ` Paul E. McKenney [this message]
2021-08-18 16:29   ` Fabio Estevam
2021-08-18 17:02     ` Fabio Estevam
2021-08-18 17:56       ` Paul E. McKenney
2021-08-19 13:24         ` Fabio Estevam
2021-09-02 21:51         ` Thomas Gleixner
2021-09-02 22:09           ` Paul E. McKenney
2021-09-03  8:07           ` Thomas Gleixner
2021-09-04 21:10             ` Fabio Estevam
2021-09-05 13:00               ` Thomas Gleixner
2021-09-05 13:07                 ` Fabio Estevam
2021-09-17 16:32   ` Qais Yousef
2021-09-17 17:09     ` Paul E. McKenney

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