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Message-ID: <20150507170626.GA27504@twins.programming.kicks-ass.net>
Date: Thu, 7 May 2015 19:06:26 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
Cc: Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
Ingo Molnar <mingo@...hat.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
NeilBrown <neilb@...e.de>
Subject: Re: pmu_dev_alloc; warning at at kernel/locking/lockdep.c:3002
lockdep_init_map
On Thu, May 07, 2015 at 05:29:57PM +0100, Tvrtko Ursulin wrote:
> >>> May 7 11:58:20 skl kernel: [ 6.066696] futex hash table entries: 1024 (order: 5, 131072 bytes)
> >>> May 7 11:58:20 skl kernel: [ 6.329549] HugeTLB registered 2 MB page size, pre-allocated 0 pages
> > sysfs by default uses lockdep key embedded in attrs. It looks like
> > somebody is making on-heap copies of attrs and using them as the group
> > attrs. What's the offending pmu type?
>
> I am not familiar with this area, is this the answer?
Nope, that's way before you get the fail. initcall_debug might get you
the right answer, but I suspect its the intel_uncore driver.
I see arch/x86/kernel/cpu/perf_event_intel_uncore.c:uncore_type_init()
do exactly what TJ says, its dynamically allocating struct attribute.
Now, let me try and trigger that locally, that should not be skylake
specific at all.
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