On Wed, Dec 9, 2015 at 6:51 AM, Brian Rak <b...@gameservers.com> wrote: > We've been tracking a memory leak on some of our machines, and have > begun using kmemleak. kmemleak is flagging things related to the ixgbe > driver: > > unreferenced object 0xffff8810298dc4c0 (size 40): > comm "softirq", pid 0, jiffies 4296008800 (age 437.153s) > hex dump (first 32 bytes): > 81 c6 8d 29 10 88 ff ff 00 00 00 00 00 00 00 00 ...)............ > 00 00 00 00 00 00 00 00 2a b6 0f 00 00 00 00 00 ........*....... > backtrace: > [<ffffffff816f5f78>] kmemleak_alloc+0x28/0x50 > [<ffffffff811c36af>] kmem_cache_alloc+0xdf/0x260 > [<ffffffff81420f3a>] alloc_iova_mem+0x1a/0x20 > [<ffffffff81421272>] alloc_iova+0x32/0x80 > [<ffffffff8142c5bb>] intel_alloc_iova+0xcb/0x100 > [<ffffffff8142f963>] __intel_map_single+0xb3/0x1e0 > [<ffffffff8142fac9>] intel_map_page+0x39/0x40 > [<ffffffffa03b2568>] ixgbe_alloc_mapped_page+0xc8/0x170 [ixgbe] > [<ffffffffa03b2668>] ixgbe_alloc_rx_buffers+0x58/0xd0 [ixgbe] > [<ffffffffa03b4421>] ixgbe_clean_rx_irq+0x141/0x2a0 [ixgbe] > [<ffffffffa03b4712>] ixgbe_poll+0xc2/0x270 [ixgbe] > [<ffffffff815de6bc>] napi_poll+0xcc/0x1c0 > [<ffffffff815de83d>] net_rx_action+0x8d/0x1b0 > [<ffffffff8107ade1>] __do_softirq+0xe1/0x290 > [<ffffffff8107b086>] irq_exit+0xa6/0xb0 > [<ffffffff817027f5>] do_IRQ+0x65/0xf0 > > Is there an issue here? I don't really have any sort of reproduction > steps right now. >
It looks like this is an IOMMU mapping for the device. Those mappings can persist for as long as the interface is up so an age of 437 seconds isn't to be unexpected. If you are wanting to flush those mappings you might use a command like "ethtool -r" to reset the interface and have it flush and rebuild the DMA mappings. - Alex ------------------------------------------------------------------------------ _______________________________________________ E1000-devel mailing list E1000-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
