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Message-ID: <alpine.DEB.2.00.1203191129440.20196@router.home> Date: Mon, 19 Mar 2012 11:31:47 -0500 (CDT) From: Christoph Lameter <cl@...ux.com> To: Sasha Levin <levinsasha928@...il.com> cc: Pablo Neira Ayuso <pablo@...filter.org>, kaber@...sh.net, davem@...emloft.net, Dave Jones <davej@...hat.com>, netfilter-devel@...r.kernel.org, "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org Subject: Re: netfilter: Hung task On Mon, 19 Mar 2012, Sasha Levin wrote: > On Mon, Mar 19, 2012 at 3:56 PM, Christoph Lameter <cl@...ux.com> wrote: > > This is sually something causing memory corruption. Please enable > > debugging to get backtrace that help to debutg this. CONFIG_SLUB_DEBUG_ON > > will do the trick or passing "slub_debug" on the kernel command line. > > The kernel was compiled with SLUB_DEBUG_ON, there's nothing coming out > of the slub before that hang message, nor after it. Ok looking at the backtrace: This is kmem_cache_destroy and not the usual failure following a pointer in alloc / free. netfilter calls kmem_cache_destroy which calls into sysfs functions and there the hang occurs. Did you try to see if lockdep can detect any serialization problems ? Is kmem_cache_destroy called with any locks held? Interrupts off? -- 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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