Messages in this thread | | | Date | Wed, 25 Nov 2015 16:08:06 +0100 | From | Joerg Roedel <> | Subject | Re: [RFC PATCH v2] iommu/amd: gray the 'irq_remap_table' object for kmemleak |
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On Fri, Nov 20, 2015 at 12:33:50PM +0100, Michael Wang wrote: > The kmemleak testing on 3.18.24 show: > > unreferenced object 0xffff880233ff9010 (size 16): > comm "swapper/0", pid 1, jiffies 4294937440 (age 2010.490s) > hex dump (first 16 bytes): > 0a 0a 00 00 20 00 00 00 00 44 fb 33 02 88 ff ff .... ....D.3.... > backtrace: > [<ffffffff8118192d>] create_object+0x10d/0x2d0 > [<ffffffff815c2d4b>] kmemleak_alloc+0x5b/0xc0 > [<ffffffff8116dd19>] kmem_cache_alloc_trace+0xb9/0x160 > [<ffffffff814ffe51>] get_irq_table+0x151/0x380 > > This is caused by the 'irq_lookup_table' was allocated with > __get_free_pages() which won't create kmemleak object, thus it's > pointers won't be count as referencing 'irq_remap_table' in > kmemleak scan.
Isn't it better to allocate the kmemleak object manually instead of ignoring all irq-table pointers? With this patch we might not notice any real leak of irq-tables.
Joerg
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