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Message-ID: <545CF938.7050906@suse.cz> Date: Fri, 07 Nov 2014 17:54:16 +0100 From: Vlastimil Babka <vbabka@...e.cz> To: Pavel Machek <pavel@....cz>, kernel list <linux-kernel@...r.kernel.org> CC: Andrew Morton <akpm@...l.org>, David Rientjes <rientjes@...gle.com>, linux-mm <linux-mm@...ck.org>, Joonsoo Kim <iamjoonsoo.kim@....com> Subject: Re: 3.18-rc3: soft lockup in compact_zone, dead machine On 11/07/2014 11:06 AM, Pavel Machek wrote: > Hi! > > My main machine died completely, it seems that original failure was > soft lockup in compact_zone(). (expanding CC) Welcome to the club... http://article.gmane.org/gmane.linux.kernel.mm/124451/match=isolate_freepages_block+very+high+intermittent+overhead https://lkml.org/lkml/2014/11/4/144 https://lkml.org/lkml/2014/11/4/904 How reproducible is your case? So far it seems that git revert e14c720efdd73c6d69cd8d07fa894bcd11fe1973 helped one of the reporters. I still don't know what's wrong, but suspect a free scanner (cc->free_pfn) position being broken (i.e. underflow), which would allow isolate_migratepages() to run for a loooooooong time. The code does cond_resched() periodically, so soft lockup looks strange, but I guess that can happen in some contexts? Vlastimil -- 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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