Messages in this thread | | | From | Song Liu <> | Date | Wed, 9 Oct 2019 09:37:24 -0700 | Subject | Re: [PATCH] kmemleak: Do not corrupt the object_list during clean-up |
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On Fri, Oct 4, 2019 at 8:11 PM Alexey Kardashevskiy <aik@ozlabs.ru> wrote: > > > > On 04/10/2019 23:46, Catalin Marinas wrote: > > In case of an error (e.g. memory pool too small), kmemleak disables > > itself and cleans up the already allocated metadata objects. However, if > > this happens early before the RCU callback mechanism is available, > > put_object() skips call_rcu() and frees the object directly. This is not > > safe with the RCU list traversal in __kmemleak_do_cleanup(). > > > > Change the list traversal in __kmemleak_do_cleanup() to > > list_for_each_entry_safe() and remove the rcu_read_{lock,unlock} since > > the kmemleak is already disabled at this point. In addition, avoid an > > unnecessary metadata object rb-tree look-up since it already has the > > struct kmemleak_object pointer. > > > > Fixes: c5665868183f ("mm: kmemleak: use the memory pool for early allocations") > > Reported-by: Alexey Kardashevskiy <aik@ozlabs.ru> > > Reported-by: Marc Dionne <marc.c.dionne@gmail.com> > > Cc: Andrew Morton <akpm@linux-foundation.org> > > Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> > > > Tested-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Tested-by: Song Liu <songliubraving@fb.com>
This fixes my vm, which could not boot with 5.4-rc3.
Thanks, Song
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