Messages in this thread | | | Date | Thu, 7 May 2015 19:29:05 +0200 | From | Peter Zijlstra <> | Subject | Re: pmu_dev_alloc; warning at at kernel/locking/lockdep.c:3002 lockdep_init_map |
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On Thu, May 07, 2015 at 07:06:26PM +0200, Peter Zijlstra wrote: > 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.
4.1-rc2+ with lockdep enabled boots without issue on my ivb-ep, no idea what's going on on your skylake thingy.
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