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

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Message-ID: <8b93f213-fe67-f132-f3f5-5b17995ec63d@gmail.com>
Date:   Thu, 16 Aug 2018 08:13:03 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Anna-Maria Gleixner <anna-maria@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Fix 80d20d35af1e ("nohz: Fix local_timer_softirq_pending()") may have
 revealed another problem

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.

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