On Tuesday 09 August 2016 05:39 PM, Grygorii Strashko wrote: > Kmemleak reports following false positive memory leaks for each sk > buffers allocated by CPSW (__netdev_alloc_skb_ip_align()) in > cpsw_ndo_open() and cpsw_rx_handler(): > > unreferenced object 0xea915000 (size 2048): > comm "systemd-network", pid 713, jiffies 4294938323 (age 102.180s) > hex dump (first 32 bytes): > 00 58 91 ea ff ff ff ff ff ff ff ff ff ff ff ff .X.............. > ff ff ff ff ff ff fd 0f 00 00 00 00 00 00 00 00 ................ > backtrace: > [<c0108680>] __kmalloc_track_caller+0x1a4/0x230 > [<c0529eb4>] __alloc_skb+0x68/0x16c > [<c052c884>] __netdev_alloc_skb+0x40/0x104 > [<bf1ad29c>] cpsw_ndo_open+0x374/0x670 [ti_cpsw] > [<c053c3d4>] __dev_open+0xb0/0x114 > [<c053c690>] __dev_change_flags+0x9c/0x14c > [<c053c760>] dev_change_flags+0x20/0x50 > [<c054bdcc>] do_setlink+0x2cc/0x78c > [<c054c358>] rtnl_setlink+0xcc/0x100 > [<c054b34c>] rtnetlink_rcv_msg+0x184/0x224 > [<c056467c>] netlink_rcv_skb+0xa8/0xc4 > [<c054b1c0>] rtnetlink_rcv+0x2c/0x34 > [<c0564018>] netlink_unicast+0x16c/0x1f8 > [<c0564498>] netlink_sendmsg+0x334/0x348 > [<c052015c>] sock_sendmsg+0x1c/0x2c > [<c05213e0>] SyS_sendto+0xc0/0xe8 > > unreferenced object 0xec861780 (size 192): > comm "softirq", pid 0, jiffies 4294938759 (age 109.540s) > hex dump (first 32 bytes): > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 00 00 00 00 00 b0 5a ed 00 00 00 00 00 00 00 00 ......Z......... > backtrace: > [<c0107830>] kmem_cache_alloc+0x190/0x208 > [<c052c768>] __build_skb+0x30/0x98 > [<c052c8fc>] __netdev_alloc_skb+0xb8/0x104 > [<bf1abc54>] cpsw_rx_handler+0x68/0x1e4 [ti_cpsw] > [<bf11aa30>] __cpdma_chan_free+0xa8/0xc4 [davinci_cpdma] > [<bf11ab98>] __cpdma_chan_process+0x14c/0x16c [davinci_cpdma] > [<bf11abfc>] cpdma_chan_process+0x44/0x5c [davinci_cpdma] > [<bf1adc78>] cpsw_rx_poll+0x1c/0x9c [ti_cpsw] > [<c0539180>] net_rx_action+0x1f0/0x2ec > [<c003881c>] __do_softirq+0x134/0x258 > [<c0038a00>] do_softirq+0x68/0x70 > [<c0038adc>] __local_bh_enable_ip+0xd4/0xe8 > [<c0640994>] _raw_spin_unlock_bh+0x30/0x34 > [<c05f4e9c>] igmp6_group_added+0x4c/0x1bc > [<c05f6600>] ipv6_dev_mc_inc+0x398/0x434 > [<c05dba74>] addrconf_dad_work+0x224/0x39c > > This happens because CPSW allocates SK buffers and then passes > pointers on them in CPDMA where they stored in internal CPPI RAM > (SRAM) which belongs to DEV MMIO space. Kmemleak does not scan IO > memory and so reports memory leaks. > > Hence, mark allocated sk buffers as false positive explicitly. > > Cc: Catalin Marinas <catalin.marinas@xxxxxxx> > Signed-off-by: Grygorii Strashko <grygorii.strashko@xxxxxx> Reviewed-by: Mugunthan V N <mugunthanvnm@xxxxxx> Regards Mugunthan V N -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
