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Date:   Thu, 17 Jan 2019 10:51:02 +0100
From:   Ingo Molnar <mingo@kernel.org>
To:     Heiko Carstens <heiko.carstens@de.ibm.com>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [GIT PULL] timer fix
Message-ID: <20190117095102.GA88466@gmail.com>
References: <20181221123453.GA102366@gmail.com>
 <20181223192926.GA3728@osiris>
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* Heiko Carstens <heiko.carstens@de.ibm.com> wrote:

> > -	if (timr->it_requeue_pending == info->si_sys_private) {
> > +	if (timr->it_interval && timr->it_requeue_pending == info->si_sys_private) {
> >  		timr->kclock->timer_rearm(timr);
> 
> FWIW, with this patch the vanilla glibc 2.28 self tests
> rt/tst-cputimer1, rt/tst-cputimer2, and rt/tst-cputimer3
> start to fail on s390:
> 
> rt/tst-cputimer1.out:
> clock_gettime returned timespec = { 0, 117181 }
> clock_getres returned timespec = { 0, 1 }
> Timed out: killed the child process
> rt/tst-cputimer1.test-result:
> FAIL: rt/tst-cputimer1
> original exit status 1
> 
> rt/tst-cputimer2.out:
> clock_gettime returned timespec = { 0, 9686 }
> clock_getres returned timespec = { 0, 1 }
> Timed out: killed the child process
> rt/tst-cputimer2.test-result:
> FAIL: rt/tst-cputimer2
> original exit status 1
> 
> rt/tst-cputimer3.out:
> clock_gettime returned timespec = { 0, 0 }
> clock_getres returned timespec = { 0, 1 }
> Timed out: killed the child process
> rt/tst-cputimer3.test-result:
> FAIL: rt/tst-cputimer3
> original exit status 1
> 
> I haven't looked any further into this, just reporting.. otherwise the
> test systems seem to be healthy.

Could you please check whether the top commit in tip:timers/urgent fixes 
it:

  93ad0fc088c5: posix-cpu-timers: Unbreak timer rearming

?

It's in tip:master as well and should show up in linux-next tomorrow.

Thanks,

	Ingo