linux-kernel - Re: Possible regression due to "tick: broadcast: Prevent livelock from event handler"

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

Date:	Fri, 3 Jul 2015 16:37:03 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Simon Horman <horms@...ge.net.au>,
	Kevin Hilman <khilman@...nel.org>,
	Tyler Baker <tyler.baker@...aro.org>,
	Borislav Petkov <bp@...en8.de>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>, linux-sh@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: Possible regression due to "tick: broadcast: Prevent livelock
 from event handler"


> So this is a single core machine and uses the em_sti timer w/o the
> broadcast nonsense. In Simons case it looks like em_sti is used as
> broadcast device.

We use the same board. Just my kernel has SMP=n.

> Though the issues you see in the highres=n case might be the same as
> the ones Simon is observing.

I hope so. One good thing about the issue I see is that it is 100%
reproducable.

> So in that nohz=y highres=n case, does adding idle=poll on the command
> line fix the issue?

Nope, still hangs.

Thanks for assisting!

   Wolfram


Download attachment "signature.asc" of type "application/pgp-signature" (820 bytes)