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Date: Thu, 23 Sep 2021 12:29:10 -0700 From: Florian Fainelli <f.fainelli@...il.com> To: linux-kernel@...r.kernel.org Cc: "Rafael J. Wysocki" <rafael@...nel.org>, Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>, "open list:HIBERNATION (aka Software Suspend, aka swsusp)" <linux-pm@...r.kernel.org> Subject: Re: [PATCH] PM / Suspend: Avoid soft lockup warning with suspend_test 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@...il.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
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