linux-kernel - Re: Fix 80d20d35af1e ("nohz: Fix local_timer_softirq_pending()") may have revealed another problem

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Message-ID: <alpine.DEB.2.21.1808181323430.2151@nanos.tec.linutronix.de>
Date:   Sat, 18 Aug 2018 13:26:47 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Heiner Kallweit <hkallweit1@...il.com>
cc:     Anna-Maria Gleixner <anna-maria@...utronix.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: Fix 80d20d35af1e ("nohz: Fix local_timer_softirq_pending()")
 may have revealed another problem

On Thu, 16 Aug 2018, Heiner Kallweit wrote:

> Recently I started to get warning "NOHZ: local_softirq_pending 202" and
> I think it's related to mentioned commit (didn't bisect it yet).
> See log from suspending.
> 
> I have no reason to think the fix is wrong, it may just have revealed
> another issue which existed before and was hidden by the bug.

Looks so. That seems to be related to CPU offlining. No idea yet...

> Rgds, Heiner
> 
> [   75.073353] random: crng init done
> [   75.073402] random: 7 urandom warning(s) missed due to ratelimiting
> [   78.619564] PM: suspend entry (deep)
> [   78.619675] PM: Syncing filesystems ... done.
> [   78.653684] Freezing user space processes ... (elapsed 0.002 seconds) done.
> [   78.656094] OOM killer disabled.
> [   78.656113] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
> [   78.658177] Suspending console(s) (use no_console_suspend to debug)
> [   78.663066] nuvoton-cir 00:07: disabled
> [   78.671817] sd 0:0:0:0: [sda] Synchronizing SCSI cache
> [   78.672210] sd 0:0:0:0: [sda] Stopping disk
> [   78.786651] ACPI: Preparing to enter system sleep state S3
> [   78.789613] PM: Saving platform NVS memory
> [   78.789759] Disabling non-boot CPUs ...
> [   78.805154] NOHZ: local_softirq_pending 202
> [   78.805182] NOHZ: local_softirq_pending 202
> [   78.807102] smpboot: CPU 1 is now offline
>