On Sat, Sep 09, 2023 at 10:28:36PM -0400, Joel Fernandes wrote:
> Hi Paul, Frederic, ever since this recent patch got merged into all
> recent stables:
> https://lore.kernel.org/all/[email protected]/
> ..
>
> .. I am seeing this happen a lot now causing rcutorture failures:
> "NOHZ tick-stop error: local softirq work is pending"
>
> It looks like the "tick-stop error" as local_bh_blocked always returns
> false on !PREEMPT_RT, so that patch itself seems correct.
>
> However, it appears the string in console-badness.sh is different:
>
> console-badness.sh:grep -v 'NOHZ tick-stop error: Non-RCU local
> softirq work is pending, handler'
>
> So the string in the script needs an update?
Looks like it, though I believe that there is a fix in the offing,
at which point that "grep -v" should just be removed. Depending on
timing, of course.
> Also, considering that it is being grep -v'ed out, any background on
> why this message is not bad and any history? Why is softirq work
> pending when the tick is stopped?
That was so long back that it is pretty hazy. I vaguely recall that
this was considered to be in need of fixing, but a false positive from
a torture-test perspective.
Thanx, Paul
