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Date: Mon, 30 Jan 2017 21:34:35 +0000 From: Matt Fleming <matt@...eblueprint.co.uk> To: Michael Ellerman <mpe@...erman.id.au> Cc: fweisbec@...il.com, tglx@...utronix.de, pmladek@...e.com, hpa@...or.com, efault@....de, sergey.senozhatsky.work@...il.com, peterz@...radead.org, mgorman@...hsingularity.net, wanpeng.li@...mail.com, umgwanakikbuti@...il.com, byungchul.park@....com, jack@...e.cz, mingo@...nel.org, riel@...hat.com, luca.abeni@...tn.it, yuyang.du@...el.com, torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org, "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>, "linux-next@...r.kernel.org" <linux-next@...r.kernel.org> Subject: Re: [tip:sched/core] sched/core: Add debugging code to catch missing update_rq_clock() calls On Tue, 31 Jan, at 08:24:53AM, Michael Ellerman wrote: > > I'm hitting this on multiple powerpc systems: > > [ 38.339126] rq->clock_update_flags < RQCF_ACT_SKIP > [ 38.339134] ------------[ cut here ]------------ > [ 38.339142] WARNING: CPU: 2 PID: 1 at kernel/sched/sched.h:804 detach_task_cfs_rq+0xa0c/0xd10 [...] > I assume I should be worried? Thanks for the report. No need to worry, the bug has existed for a while, this patch just turns on the warning ;-) The following commit queued up in tip/sched/core should fix your issues (assuming you see the same callstack on all your powerpc machines): https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?h=sched/core&id=1b1d62254df0fe42a711eb71948f915918987790
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