From: Florian Fainelli <f.fainelli@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: "Rafael J. Wysocki" <rafael@kernel.org>,
Pavel Machek <pavel@ucw.cz>, Len Brown <len.brown@intel.com>,
"open list:HIBERNATION (aka Software Suspend,
aka swsusp)" <linux-pm@vger.kernel.org>
Subject: Re: [PATCH] PM / Suspend: Avoid soft lockup warning with suspend_test
Date: Thu, 23 Sep 2021 12:29:10 -0700 [thread overview]
Message-ID: <0b44f2c0-bab6-5e6a-e4fb-d9aa89038675@gmail.com> (raw)
In-Reply-To: <20210923185106.501848-1-f.fainelli@gmail.com>
On 9/23/21 11:51 AM, Florian Fainelli wrote:
> When testing with a large (>= 22 seconds) pm_test_delay we can see the
> NMI soft lockup barfing at us because a task has been blocked for too
> long. This can be reproduced with:
>
> echo devices > /sys/power/pm_test
> echo 30 > /sys/module/suspend/parameters/pm_test_delay
>
> Unroll the loop and touch the NMI watchdog every 1s to avoid the lockup
> warnings.
>
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Looks like I cannot reproduce the NMI soft lockup warnings with 5.10 and
newer, however I can easily trigger RCU stalls. Let me sleep on it for a
bit and see what needs fixing in 5.15 and newer. Any feedback welcome.
--
Florian
prev parent reply other threads:[~2021-09-23 19:29 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-23 18:51 [PATCH] PM / Suspend: Avoid soft lockup warning with suspend_test Florian Fainelli
2021-09-23 19:29 ` Florian Fainelli [this message]
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