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From:   Larry Finger <Larry.Finger@lwfinger.net>
Subject: False memory leak in iwlmvm
To:     Johannes Berg <johannes.berg@intel.com>,
        Emmanuel Grumbach <emmanuel.grumbach@intel.com>,
        Luca Coelho <luciano.coelho@intel.com>
Cc:     LKML <linux-kernel@vger.kernel.org>
Message-ID: <b785238b-9d20-0297-382c-65f41be00ea3@lwfinger.net>
Date:   Sat, 21 Apr 2018 15:32:51 -0500
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Gentlemen,

I was checking a scan of /sys/kernel/debug/kmemleak with 4.17.0-rc1 and came 
across this leak message arising from iwlwifi. It is a false message as 
unloading iwlmvm has it disappearing from the scan.

Thanks,
Larry

unreferenced object 0xffff88021da6c580 (size 128):
   comm "softirq", pid 0, jiffies 4298748784 (age 7844.956s)
   hex dump (first 32 bytes):
     00 c4 a6 1d 02 88 ff ff 00 00 00 00 00 00 00 00  ................
     00 00 00 00 20 00 00 00 00 38 49 15 ca 55 00 00  .... ....8I..U..
   backtrace:
     [<00000000599c704b>] nf_ct_ext_add+0x9e/0x180 [nf_conntrack]
     [<00000000e323b857>] init_conntrack+0x206/0x5b0 [nf_conntrack]
     [<00000000639e3725>] nf_conntrack_in+0x3c8/0x4e0 [nf_conntrack]
     [<00000000795b6382>] nf_hook_slow+0x43/0xc0
     [<000000005e335478>] ip_rcv+0x2e3/0x3a0
     [<0000000063a4cdd5>] __netif_receive_skb_core+0x3f5/0xb70
     [<00000000cb885815>] netif_receive_skb_internal+0x2c/0xf0
     [<00000000976d864f>] napi_gro_receive+0xd1/0xf0
     [<00000000ea233b08>] ieee80211_deliver_skb+0xe7/0x250 [mac80211]
     [<00000000b29f1d1e>] ieee80211_rx_handlers+0xd30/0x1e40 [mac80211]
     [<000000004f15ea1a>] ieee80211_prepare_and_rx_handle+0x534/0x11c0 [mac80211]
     [<0000000088d8e9fc>] ieee80211_rx_napi+0x328/0x9c0 [mac80211]
     [<000000008360ee9e>] iwl_mvm_rx_rx_mpdu+0x501/0x960 [iwlmvm]
     [<00000000b977d096>] iwl_pcie_rx_handle+0x21d/0x870 [iwlwifi]
     [<000000005ccb7965>] iwl_pcie_irq_handler+0x6b5/0xa00 [iwlwifi]
     [<0000000010a165b6>] irq_thread_fn+0x21/0x50