linux-kernel - Re: Occasionally losing the tick_sched

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <alpine.DEB.2.21.1804101105260.2058@nanos.tec.linutronix.de>
Date:   Tue, 10 Apr 2018 11:07:03 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Nicholas Piggin <npiggin@...il.com>
cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        linuxppc-dev@...ts.ozlabs.org, kvm-ppc@...r.kernel.org,
        Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: Occasionally losing the tick_sched_timer

On Tue, 10 Apr 2018, Nicholas Piggin wrote:
> On Tue, 10 Apr 2018 09:42:29 +0200 (CEST)
> Thomas Gleixner <tglx@...utronix.de> wrote:
> > > Thomas do you have any ideas on what we might look for, or if we can add
> > > some BUG_ON()s to catch this at its source?  
> > 
> > Not really. Tracing might be a more efficient tool that random BUG_ONs.
> 
> Sure, we could try that. Any suggestions? timer events?

timer, hrtimer and the tick-sched stuff should be a good start. And make
sure to freeze the trace once you hit the fault case. tracing_off() is your
friend.

Thanks,

	tglx