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

From: Heiner Kallweit
Date: Thu Aug 16 2018 - 02:13:15 EST


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