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From: Qais Yousef <qais.yousef@arm.com>
To: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Fabio Estevam <festevam@gmail.com>,
	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>
Subject: Re: NOHZ tick-stop error with ath10k SDIO
Date: Fri, 17 Sep 2021 17:32:45 +0100	[thread overview]
Message-ID: <20210917163245.f53fh2nuswqlkwgw@e107158-lin> (raw)
In-Reply-To: <20210818154358.GS4126399@paulmck-ThinkPad-P17-Gen-1>

Hi Paul

On 08/18/21 08:43, Paul E. McKenney wrote:
> 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.

Sorry for the late response. A combination of holidays and sickness kept me
away from email for a while.

I did see an issue on 5.10 recently but I was running android kernel. I thought
initially the problem is similar to the upstream one we were seeing on mainline
for a while in the past but it turned out a genuine bug due to a patch that
tries to 'fix' softirq interference with RT. Reverting that patch fixed the
issue for me. It turned out later that it was specific to the platform I was
running on and it's not reproducible by others on other platforms.

Upstream 5.10-LTS was fine for me.

HTH.

Thanks

--
Qais Yousef

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  parent reply	other threads:[~2021-09-17 16:33 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
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 [this message]
2021-09-17 17:09     ` Paul E. McKenney

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