Messages in this thread | | | Date | Mon, 19 Mar 2012 11:31:47 -0500 (CDT) | From | Christoph Lameter <> | Subject | Re: netfilter: Hung task |
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On Mon, 19 Mar 2012, Sasha Levin wrote:
> On Mon, Mar 19, 2012 at 3:56 PM, Christoph Lameter <cl@linux.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?
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