Re: [BUG-REPORT] hrtick_start_fair and CPU-Hotplug

Peter Zijlstra
2008-04-29T06:59:31Z

On Tue, 2008-04-29 at 12:22 +0530, Gautham R Shenoy wrote:
> Hello!
>
> While running the usual CPU-Hotplug stress tests on linux-2.6.25,
> I noticed the following in the console logs.
>
> This is a wee bit difficult to reproduce. In the past 10 runs I hit this
> only once.
>
> ------------[ cut here ]------------
>
> WARNING: at kernel/sched.c:962 hrtick+0x2e/0x65()

> I am not well versed with this part of the code, so just wondering if we
> are doing a good job at handling the cancellation of any per-cpu
> scheduler timers during CPU-Hotplug.

This looks like its not cancelled at all and migrates the it to another
cpu. I'll see what I can come up with.