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</p>
<h2 id="10"><span class="ez-toc-section" id="Environment"></span>Environment<span class="ez-toc-section-end"></span></h2>
<p> <str></p>
<li>Red Hat Enterprise Linux 6.5</li>
<li><code>kernel-2.6.32-431.1.2.el6.x86_64</code></li>
<li><code>HP ProLiant DL580 G7 Systems</code>.</li>
<li><code>netxen_nic</code> network card modules.</li>
<p>Network card modules </p>
<li><code>ixgbe</code>.</li>
</ul>
</section>
<p><title> </p>
<h2 id="11"><span class="ez-toc-section" id="Problem"></span>Problem<span class="ez-toc-section-end"></span></h2>
<p> <str></p>
<li>If your VMware service is running on a good host using the <code>clusvcadm -e Plato-VMWARE</code> command, the system becomes idle and the following variants are generated:</li>
</ul>
<preliminary><code>19. Dec 11:37:46 HOSTNAME Core: ------------[cut here]------------Dec 29 11:37:46 AM Core HOSTNAME: WARNING: online/core/dev.c:1907 skb_warn_bad_offload+0xc2/0xf0() (corrupted: G W --------------- )Dec 19 11:37:46 HOSTNAME Core: Hardware name: ProLiant DL580 G7Dec 19 11:37:46 AM Core HOSTNAME: netxen_nic: caps=(0x11c9b3, 0x0) len=146 data_len=0 ip_sumd=1Dec 21 11:37:46 AM HOSTNAME Core: Related modules in: vmnet(U) ppdev parport_pc parport fuse vsock(U) vmci(U) vmmon(U) nfsd exportfs autofs4 gfs2 nfs lockd fscache auth_rpcgss nfs_acl sunrpc dlm configfs cpufreq_on fredemandq_pcc_pcc arp_tables ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_recent ipt_LOG iptable_filter ip_tables ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables IPv6 dm_round_robin dm_multipath uinput micro iTCO_wdt iTCO_vendor_support power_meter lpc_ich mfd_core SG netxen_nic hpilo hpwdt i7core_edac edac_core shpchp ext4 JBD2 mbcache sr_mod CDROM crc_t10dif sd_mod qla2xxx scsi_transport_fc scsi_tgtpata_acpi ata_generic ata_piix HpSA Radeon TTM drm_kms_helper DRM i2c_algo_bit i2c_core dm_mirror dm_region_hash dm_log dm_mod [last dump: scsi_wait_scan]Dec 22 11:37:46 HOSTNAME Core: Pid: 0, Comm: Swapper Skin Tone: G W --------------- 2.6.32-431.1.2.el6.x86_64 #1Dec 20 11:37:46 AM Core HOSTNAME: Call Tracking:Dec 19 11:37:46 HOSTNAME Core: <irq> [<ffffffff81071e27>]? warn_slowpath_common+0x87/0xc0Dec 19 11:37:46 AM Core HOSTNAME: [<ffffffff81071f16>]? warn_slowpath_fmt+0x46/0x50Dec 24 11:37:46 AM HOSTNAME Core: [<ffffffffa0342370>]? netxen_nic_get_drvinfo+0xc0/0xf0 [netxen_nic]Dec 20 11:37:46 AM Core HOSTNAME: [<ffffffff8145afe2>]? skb_warn_bad_offload+0xc2/0xf0Dec 19 11:37:46 AM Core HOSTNAME: [<ffffffff814600d1>]: __skb_gso_segment+0x71/0xc0Dec 19 11:37:46 AM Core HOSTNAME: [<ffffffff81460133>]? skb_gso_segment+0x13/0x20Dec 19 11:37:46 AM Core HOSTNAME: [<ffffffffa069f9bd>]? VNetBridgeSendLargePacket+0x1d/0x90 [vmnet]Dec 21 11:37:46 AM Core HOSTNAME: [<ffffffffa06a0c70>]? VNetBridgeReceiveFromDev+0x310/0x420 [vmnet]Dec 19 11:37:46 AM Core HOSTNAME: [<ffffffff8145b527>]. . . __netif_receive_skb+0x477/0x750Dec 19 11:37:46 AM Core HOSTNAME: [<ffffffff8145f1c8>]? netif_receive_skb+0x58/0x60Dec 19 11:37:46 AM Core HOSTNAME: [<ffffffffa033e523>]? netxen_process_rcv_ring+0x913/0xb00 [netxen_nic]Dec 14 11:37:46 AM Core HOSTNAME: [<ffffffffa0340b84>]? ! ? netxen_process_cmd_ring+0x44/0x2a0 [netxen_nic]Dec 19 11:37:46 AM Core HOSTNAME: [<ffffffff81058d53>]! ! ! __wake_up+0x53/0x70Dec 19 11:37:46 AM HOSTNAME Core: [<ffffffffa0339b65>]? netxen_nic_poll+0x45/0xc0 [netxen_nic]Dec 15 11:37:46 AM Core HOSTNAME: [<ffffffff813301f6>]? credit_entropy_bits+0x76/0xd0Dec 29 11:37:46 AM Core HOSTNAME: [<ffffffff81460b53>]! ? net_rx_action+0x103/0x2f0Dec 19 11:37:46 AM Core HOSTNAME: [<ffffffff81330356>]? add_timer_randomness+0x106/0x110Dec 19 11:37:46 AM Core HOSTNAME: [<ffffffff8107a8e1>]? ! ? __do_softirq+0xc1/0x1e0Dec 19 11:37:46 AM Core HOSTNAME: [<ffffffff810e6f02>]? handle_IRQ_event+0x92/0x170Dec 19 11:37:46 AM Core HOSTNAME: [<ffffffff8100c30c>]? call_softirq+0x1c/0x30Dec 20 11:37:46 AM HOSTNAME Core: [<ffffffff8100fa75>]? do_softirq+0x65/0xa0Dec 19 11:37:46 AM Core HOSTNAME: [<ffffffff8107a795>] irq_exit+0x85/0x90Dec 19 11:37:46 AM Core HOSTNAME: [<ffffffff81530ff5>]? do_IRQ+0x75/0xf0Dec 19 11:37:46 AM Core HOSTNAME: [<ffffffff8100b9d3>] - ret_from_intr+0x0/0x11Dec 19 11:37:46 AM HOSTNAME Core: <eoi> [<ffffffff81426521>]? poll_idle+0x41/0x80Dec 16 11:37:46 AM Core HOSTNAME: [<ffffffff814264f3>]? 20 poll_idle+0x13/0x80Dec 11:37:46 Kernel HOST NAME: [<ffffffff81426707>]? cpuidle_idle_call+0xa7/0x140Dec 19 11:37:46 AM Core HOSTNAME: [<ffffffff81009fc6>]? ! ? cpu_idle+0xb6/0x110Dec 19 11:37:46 AM Core HOSTNAME: [<ffffffff81520e2c>]? start_secondary+0x2ac/0x2efDec 19 11:37:46 HOSTNAME Core: ---[ end trace 228c1f1e9ed1b9eb ]---</code></pre>
</section>
<p><title> </p>
<h2 id="12"><span class="ez-toc-section" id="Resolution"></span>Resolution<span class="ez-toc-section-end"></span></h2>
<p><img src="https://www.fatalerrors.org/images/blog/faadb2f3ff30aa4779fa5311086a50d9.jpg" style="margin-top:20px; margin-bottom:20px; display: block; margin: 0 auto;" alt="kernel warning at net/core/dev.c"></p>
<p>Disable Large Receive Offload (LRO) and/or General Receive Offload (GRO).</p>
<p>This can be done during playback with the following commands:</p>
<p><img src="/posts/kernel-warning-at-net-core-dev-c.png" style="margin-top:20px; margin-bottom:20px; display: block; margin: 0 auto;" alt="kernel warning at net/core/dev.c"></p>
<pre><code># ethtool -e ethX# ethtool -K ethX lro disabled# ethtool -K ethX disable</code></pre>
<p>You can save these settings across reboots by simply writing /sbin/ifup-local as described here.</p>
<p>Note. It is not correct to enable LRO after using IP forwarding and/or bridging.</p>
</section>
<p><title> </p>
<h2 id="13"><span class="ez-toc-section" id="Reason"></span>Reason<span class="ez-toc-section-end"></span></h2>
<p> <str></p>
<li>This should be a warning that fires when the GSO has skb skb->ip_summed != CHECKSUM_PARTIAL. Ideally, skb->ip_summed should be set to CHECKSUM_PARTIAL</li>
<p> in the GSO.</p>
<li>skb->ip_sumd may have been set to CHECKSUM_UNNECESSARY, probably mainly by a VMware driver or a specific guest.</li>
<li>skb_gso_segment() has been included to take advantage of the fact that openvswitch calls this function as soon as it receives a packet. Other than methods, for openvswitch it must not exist in the get path.</li>
<li>LRO may be highlighting a package that VMware doesn’t know how to process properly. Disabling LRO provides a workaround.</li>
<li>This proves that this bug is in VMware</li>
</ul>
</section>
<p><title> </p>
<h2 id="14"><span class="ez-toc-section" id="Diagnostic_Steps"></span>Diagnostic Steps<span class="ez-toc-section-end"></span></h2>
<p> <str></p>
<li>Check the authenticity of the network card module you are using.</li>
<li>Check logs with sosreport.<code>strace</code> </li>
<li>Collect the logs as shown below for the <code>clusvcadm</code> command.</li>
</ul>
<pre><code># strace -o /tmp/strace.txt clusvcadm -e Far plato-vmware</code></pre>
<ul>
<li>
<p>Because the physical machine is busy, it looks likeas an RX packet for which the NetXen NIC models skb->ip_summed=CHECKSUM_UNNECESSARY.</p>
</li>
<li><div style="background: rgba(156, 156, 156, 0.07);margin:20px 0 20px 0;padding:20px 10px 20px 10px;border: solid 1px rgba(0,0,0,0.03);text-align: left;"><h2><span class="ez-toc-section" id="Fix_your_computer_now_with_ASR_Pro-2"></span>Fix your computer now with <a href="https://link.advancedsystemrepairpro.com/d7b96561?clickId=firewallrepublic.com" target="_blank" rel="nofollow">ASR Pro</a><span class="ez-toc-section-end"></span></h2>
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