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Date: Fri, 7 Nov 2014 08:59:25 +0100 From: Geert Uytterhoeven <geert@...ux-m68k.org> To: Daniel Lezcano <daniel.lezcano@...aro.org> Cc: Ingo Molnar <mingo@...nel.org>, Nicolas Pitre <nicolas.pitre@...aro.org>, Paul McKenney <paulmck@...ux.vnet.ibm.com>, Jiri Kosina <jkosina@...e.cz>, "Rafael J. Wysocki" <rjw@...ysocki.net>, Linux PM list <linux-pm@...r.kernel.org>, Linux-sh list <linux-sh@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: (bisected) Lock up on sh73a0/kzm9g on cpuidle initialization Hi Daniel, On Thu, Nov 6, 2014 at 10:02 PM, Daniel Lezcano <daniel.lezcano@...aro.org> wrote: > On 11/06/2014 09:38 PM, Geert Uytterhoeven wrote: >> When CONFIG_CPU_IDLE=y, the kernel locks up during cpuidle initialization >> on Renesas sh73a0/kzm9g-reference, which has a dual-core Cortex-A9. >> >> Last message is: >> >> DMA: preallocated 256 KiB pool for atomic coherent allocations >> >> After this it's supposed to print: >> >> cpuidle: using governor ladder >> cpuidle: using governor menu >> >> I've bisected this to commit 442bf3aaf55a91ebfec71da46a4ee10a3c905bcc >> ("sched: Let the scheduler see CPU idle states"). >> >> Reverting that commit, and commit 83a0a96a5f26d974580fd7251043ff70c8f1823d >> ("sched/fair: Leverage the idle state info when choosing the "idlest" >> cpu") which >> depends on it, fixes the problem. >> >> I saw the discussion "lockdep splat in CPU hotplug", so I enabled lockdep >> debugging, but didn't see a lockdep splat. > > Did you try the fix attached ? > > https://lkml.org/lkml/2014/10/22/722 Thanks, I didn't try that. However, this patch seems to be in v3.18-rc3, so I'm already using it. Hence it doesn't fix the problem for me. On another board, with a dual Cortex-A15, the problem doesn't show up. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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